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refactor: rename microservices patterns

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Ilkka Seppälä
2024-06-01 06:17:32 +03:00
parent bf8388837a
commit ec5d08e982
76 changed files with 12 additions and 12 deletions
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microservices-api-gateway/README.md
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---
title: API Gateway
category: Integration
language: en
tag:
- API design
- Cloud distributed
- Decoupling
- Enterprise patterns
- Integration
- Microservices
- Scalability
- Security
---
## Intent
The API Gateway design pattern aims to provide a unified interface to a set of microservices. It acts as a single entry point for clients, routing requests to the appropriate microservices and aggregating results, thereby simplifying the client-side code.
## Also known as
* API Facade
* Backend for Frontends (BFF)
## Explanation
Real-world example
> In a large e-commerce platform, an API Gateway is used as the single entry point for all client requests. When a user visits the site or uses the mobile app, their requests for product information, user authentication, order processing, and payment are all routed through the API Gateway. The gateway handles tasks such as user authentication, rate limiting to prevent abuse, and logging for monitoring purposes. This setup simplifies the client interface and ensures that all backend microservices, like the product catalog service, user service, order service, and payment service, can evolve independently without affecting the client directly. This also enhances security by providing a centralized point to enforce policies and monitor traffic.
In plain words
> For a system implemented using microservices architecture, API Gateway is the single entry point that aggregates the calls to the individual microservices.
Wikipedia says
> API Gateway is a server that acts as an API front-end, receives API requests, enforces throttling and security policies, passes requests to the back-end service and then passes the response back to the requester. A gateway often includes a transformation engine to orchestrate and modify the requests and responses on the fly. A gateway can also provide functionality such as collecting analytics data and providing caching. The gateway can provide functionality to support authentication, authorization, security, audit and regulatory compliance.
**Programmatic Example**
This implementation shows what the API Gateway pattern could look like for an e-commerce site. The`ApiGateway` makes calls to the Image and Price microservices using the `ImageClientImpl` and `PriceClientImpl` respectively. Customers viewing the site on a desktop device can see both price information and an image of a product, so the `ApiGateway` calls both of the microservices and aggregates the data in the `DesktopProduct` model. However, mobile users only see price information; they do not see a product image. For mobile users, the `ApiGateway` only retrieves price information, which it uses to populate the `MobileProduct`.
Here's the Image microservice implementation.
```java
public interface ImageClient {
String getImagePath();
}
public class ImageClientImpl implements ImageClient {
@Override
public String getImagePath() {
var httpClient = HttpClient.newHttpClient();
var httpGet = HttpRequest.newBuilder()
.GET()
.uri(URI.create("http://localhost:50005/image-path"))
.build();
try {
var httpResponse = httpClient.send(httpGet, BodyHandlers.ofString());
return httpResponse.body();
} catch (IOException | InterruptedException e) {
e.printStackTrace();
}
return null;
}
}
```
Here's the Price microservice implementation.
```java
public interface PriceClient {
String getPrice();
}
public class PriceClientImpl implements PriceClient {
@Override
public String getPrice() {
var httpClient = HttpClient.newHttpClient();
var httpGet = HttpRequest.newBuilder()
.GET()
.uri(URI.create("http://localhost:50006/price"))
.build();
try {
var httpResponse = httpClient.send(httpGet, BodyHandlers.ofString());
return httpResponse.body();
} catch (IOException | InterruptedException e) {
e.printStackTrace();
}
return null;
}
}
```
Here we can see how API Gateway maps the requests to the microservices.
```java
public class ApiGateway {
@Resource
private ImageClient imageClient;
@Resource
private PriceClient priceClient;
@RequestMapping(path = "/desktop", method = RequestMethod.GET)
public DesktopProduct getProductDesktop() {
var desktopProduct = new DesktopProduct();
desktopProduct.setImagePath(imageClient.getImagePath());
desktopProduct.setPrice(priceClient.getPrice());
return desktopProduct;
}
@RequestMapping(path = "/mobile", method = RequestMethod.GET)
public MobileProduct getProductMobile() {
var mobileProduct = new MobileProduct();
mobileProduct.setPrice(priceClient.getPrice());
return mobileProduct;
}
}
```
## Applicability
* When building a microservices architecture, and there's a need to abstract the complexity of microservices from the client.
* When multiple microservices need to be consumed in a single request.
* For authentication, authorization, and security enforcement at a single point.
* To optimize communication between clients and services, especially in a cloud environment.
## Tutorials
* [Exploring the New Spring Cloud Gateway (Baeldung)](https://www.baeldung.com/spring-cloud-gateway)
* [Spring Cloud - Gateway(tutorialspoint)](https://www.tutorialspoint.com/spring_cloud/spring_cloud_gateway.htm)
* [Getting Started With Spring Cloud Gateway (DZone)](https://dzone.com/articles/getting-started-with-spring-cloud-gateway)
## Consequences
Benefits:
* Decouples client from microservices, allowing services to evolve independently.
* Simplifies client by aggregating requests to multiple services.
* Centralized location for cross-cutting concerns like security, logging, and rate limiting.
* Potential for performance optimizations like caching and request compression.
Trade-offs:
* Introduces a single point of failure, although this can be mitigated with high availability setups.
* Can become a bottleneck if not properly scaled.
* Adds complexity in terms of deployment and management.
## Known uses
* E-commerce platforms where multiple services (product info, pricing, inventory) are aggregated for a single view.
* Mobile applications that consume various backend services but require a simplified interface for ease of use.
* Cloud-native applications that leverage multiple microservices architectures.
## Related patterns
* [Aggregator Microservice](https://java-design-patterns.com/patterns/aggregator-microservices/) - The API Gateway pattern is often used in conjunction with the Aggregator Microservice pattern to provide a unified interface to a set of microservices.
* [Circuit Breaker](https://java-design-patterns.com/patterns/circuit-breaker/) - API Gateways can use the Circuit Breaker pattern to prevent cascading failures when calling multiple microservices.
* [Proxy](https://java-design-patterns.com/patterns/proxy/) - The API Gateway pattern is a specialized form of the Proxy pattern, where the gateway acts as a single entry point for clients, routing requests to the appropriate microservices and aggregating results.
## Credits
* [Building Microservices](https://amzn.to/3UACtrU)
* [Cloud Native Patterns: Designing change-tolerant software](https://amzn.to/3uV12WN)
* [Designing Data-Intensive Applications](https://amzn.to/3PfRk7Y)
* [Microservices Patterns: With examples in Java](https://amzn.to/3UyWD5O)
* [API Gateway (microservices.io)](http://microservices.io/patterns/apigateway.html)
* [Building Microservices: Using an API Gateway (nginx)](https://www.nginx.com/blog/building-microservices-using-an-api-gateway/)
microservices-api-gateway/api-gateway-service/etc/api-gateway-service.urm.puml
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@startuml
package com.iluwatar.api.gateway {
class ApiGateway {
- imageClient : ImageClient
- priceClient : PriceClient
+ ApiGateway()
+ getProductDesktop() : DesktopProduct
+ getProductMobile() : MobileProduct
}
class App {
+ App()
+ main(args : String[]) {static}
}
class DesktopProduct {
- imagePath : String
- price : String
+ DesktopProduct()
+ getImagePath() : String
+ getPrice() : String
+ setImagePath(imagePath : String)
+ setPrice(price : String)
}
interface ImageClient {
+ getImagePath() : String {abstract}
}
class ImageClientImpl {
+ ImageClientImpl()
+ getImagePath() : String
}
class MobileProduct {
- price : String
+ MobileProduct()
+ getPrice() : String
+ setPrice(price : String)
}
interface PriceClient {
+ getPrice() : String {abstract}
}
class PriceClientImpl {
+ PriceClientImpl()
+ getPrice() : String
}
}
ApiGateway --> "-imageClient" ImageClient
ApiGateway --> "-priceClient" PriceClient
ImageClientImpl ..|> ImageClient
PriceClientImpl ..|> PriceClient
@enduml
microservices-api-gateway/api-gateway-service/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!--
This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
The MIT License
Copyright © 2014-2022 Ilkka Seppälä
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>microservices-api-gateway</artifactId>
<groupId>com.iluwatar</groupId>
<version>1.26.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>api-gateway-service</artifactId>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<configuration>
<archive>
<manifest>
<mainClass>com.iluwatar.api.gateway.App</mainClass>
</manifest>
</archive>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
microservices-api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/ApiGateway.java
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.api.gateway;
import jakarta.annotation.Resource;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* The ApiGateway aggregates calls to microservices based on the needs of the individual clients.
*/
@RestController
public class ApiGateway {
@Resource
private ImageClient imageClient;
@Resource
private PriceClient priceClient;
/**
* Retrieves product information that desktop clients need.
*
* @return Product information for clients on a desktop
*/
@GetMapping("/desktop")
public DesktopProduct getProductDesktop() {
var desktopProduct = new DesktopProduct();
desktopProduct.setImagePath(imageClient.getImagePath());
desktopProduct.setPrice(priceClient.getPrice());
return desktopProduct;
}
/**
* Retrieves product information that mobile clients need.
*
* @return Product information for clients on a mobile device
*/
@GetMapping("/mobile")
public MobileProduct getProductMobile() {
var mobileProduct = new MobileProduct();
mobileProduct.setPrice(priceClient.getPrice());
return mobileProduct;
}
}
microservices-api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/App.java
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.api.gateway;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* With the Microservices pattern, a client may need data from multiple different microservices. If
* the client called each microservice directly, that could contribute to longer load times, since
* the client would have to make a network request for each microservice called. Moreover, having
* the client call each microservice directly ties the client to that microservice - if the internal
* implementations of the microservices change (for example, if two microservices are combined
* sometime in the future) or if the location (host and port) of a microservice changes, then every
* client that makes use of those microservices must be updated.
*
* <p>The intent of the API Gateway pattern is to alleviate some of these issues. In the API
* Gateway pattern, an additional entity (the API Gateway) is placed between the client and the
* microservices. The job of the API Gateway is to aggregate the calls to the microservices. Rather
* than the client calling each microservice individually, the client calls the API Gateway a single
* time. The API Gateway then calls each of the microservices that the client needs.
*
* <p>This implementation shows what the API Gateway pattern could look like for an e-commerce
* site. The {@link ApiGateway} makes calls to the Image and Price microservices using the {@link
* ImageClientImpl} and {@link PriceClientImpl} respectively. Customers viewing the site on a
* desktop device can see both price information and an image of a product, so the {@link
* ApiGateway} calls both of the microservices and aggregates the data in the {@link DesktopProduct}
* model. However, mobile users only see price information; they do not see a product image. For
* mobile users, the {@link ApiGateway} only retrieves price information, which it uses to populate
* the {@link MobileProduct}.
*/
@SpringBootApplication
public class App {
/**
* Program entry point.
*
* @param args command line args
*/
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}
microservices-api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/DesktopProduct.java
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.api.gateway;
import lombok.Getter;
import lombok.Setter;
/**
* Encapsulates all of the information that a desktop client needs to display a product.
*/
@Getter
@Setter
public class DesktopProduct {
/**
* The price of the product.
*/
private String price;
/**
* The path to the image of the product.
*/
private String imagePath;
}
microservices-api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/ImageClient.java
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.api.gateway;
/**
* An interface used to communicate with the Image microservice.
*/
public interface ImageClient {
String getImagePath();
}
microservices-api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/ImageClientImpl.java
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.api.gateway;
import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
/**
* An adapter to communicate with the Image microservice.
*/
@Slf4j
@Component
public class ImageClientImpl implements ImageClient {
/**
* Makes a simple HTTP Get request to the Image microservice.
*
* @return The path to the image
*/
@Override
public String getImagePath() {
var httpClient = HttpClient.newHttpClient();
var httpGet = HttpRequest.newBuilder()
.GET()
.uri(URI.create("http://localhost:50005/image-path"))
.build();
try {
LOGGER.info("Sending request to fetch image path");
var httpResponse = httpClient.send(httpGet, BodyHandlers.ofString());
logResponse(httpResponse);
return httpResponse.body();
} catch (IOException ioe) {
LOGGER.error("Failure occurred while getting image path", ioe);
} catch (InterruptedException ie) {
LOGGER.error("Failure occurred while getting image path", ie);
Thread.currentThread().interrupt();
}
return null;
}
private void logResponse(HttpResponse<String> httpResponse) {
if (isSuccessResponse(httpResponse.statusCode())) {
LOGGER.info("Image path received successfully");
} else {
LOGGER.warn("Image path request failed");
}
}
private boolean isSuccessResponse(int responseCode) {
return responseCode >= 200 && responseCode <= 299;
}
}
microservices-api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/MobileProduct.java
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.api.gateway;
import lombok.Getter;
import lombok.Setter;
/**
* Encapsulates all of the information that mobile client needs to display a product.
*/
@Getter
@Setter
public class MobileProduct {
/**
* The price of the product.
*/
private String price;
}
microservices-api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/PriceClient.java
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.api.gateway;
/**
* An interface used to communicate with the Price microservice.
*/
public interface PriceClient {
String getPrice();
}
microservices-api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/PriceClientImpl.java
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.api.gateway;
import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
/**
* An adapter to communicate with the Price microservice.
*/
@Slf4j
@Component
public class PriceClientImpl implements PriceClient {
/**
* Makes a simple HTTP Get request to the Price microservice.
*
* @return The price of the product
*/
@Override
public String getPrice() {
var httpClient = HttpClient.newHttpClient();
var httpGet = HttpRequest.newBuilder()
.GET()
.uri(URI.create("http://localhost:50006/price"))
.build();
try {
LOGGER.info("Sending request to fetch price info");
var httpResponse = httpClient.send(httpGet, BodyHandlers.ofString());
logResponse(httpResponse);
return httpResponse.body();
} catch (IOException e) {
LOGGER.error("Failure occurred while getting price info", e);
} catch (InterruptedException e) {
LOGGER.error("Failure occurred while getting price info", e);
Thread.currentThread().interrupt();
}
return null;
}
private void logResponse(HttpResponse<String> httpResponse) {
if (isSuccessResponse(httpResponse.statusCode())) {
LOGGER.info("Price info received successfully");
} else {
LOGGER.warn("Price info request failed");
}
}
private boolean isSuccessResponse(int responseCode) {
return responseCode >= 200 && responseCode <= 299;
}
}
microservices-api-gateway/api-gateway-service/src/main/resources/application.properties
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#
# The MIT License
# Copyright © 2014-2021 Ilkka Seppälä
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
server.port=50004
microservices-api-gateway/api-gateway-service/src/test/java/com/iluwatar/api/gateway/ApiGatewayTest.java
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.api.gateway;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Mockito.when;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
/**
* Test API Gateway Pattern
*/
class ApiGatewayTest {
@InjectMocks
private ApiGateway apiGateway;
@Mock
private ImageClient imageClient;
@Mock
private PriceClient priceClient;
@BeforeEach
void setup() {
MockitoAnnotations.openMocks(this);
}
/**
* Tests getting the data for a desktop client
*/
@Test
void testGetProductDesktop() {
var imagePath = "/product-image.png";
var price = "20";
when(imageClient.getImagePath()).thenReturn(imagePath);
when(priceClient.getPrice()).thenReturn(price);
var desktopProduct = apiGateway.getProductDesktop();
assertEquals(price, desktopProduct.getPrice());
assertEquals(imagePath, desktopProduct.getImagePath());
}
/**
* Tests getting the data for a mobile client
*/
@Test
void testGetProductMobile() {
var price = "20";
when(priceClient.getPrice()).thenReturn(price);
var mobileProduct = apiGateway.getProductMobile();
assertEquals(price, mobileProduct.getPrice());
}
}
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microservices-api-gateway/etc/api-gateway.ucls
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<?xml version="1.0" encoding="UTF-8"?>
<class-diagram version="1.1.9" icons="true" automaticImage="PNG" always-add-relationships="false" generalizations="true"
realizations="true" associations="true" dependencies="false" nesting-relationships="true" router="FAN">
<class id="1" language="java" name="com.iluwatar.api.gateway.ApiGateway" project="api-gateway"
file="/api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/ApiGateway.java" binary="false" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="125" y="87"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<class id="2" language="java" name="com.iluwatar.api.gateway.DesktopProduct" project="api-gateway"
file="/api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/DesktopProduct.java" binary="false" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="388" y="109"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<interface id="3" language="java" name="com.iluwatar.api.gateway.ImageClient" project="api-gateway"
file="/api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/ImageClient.java" binary="false" corner="BOTTOM_RIGHT">
<position height="81" width="129" x="13" y="197"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</interface>
<class id="4" language="java" name="com.iluwatar.api.gateway.ImageClientImpl" project="api-gateway"
file="/api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/ImageClientImpl.java" binary="false" corner="BOTTOM_RIGHT">
<position height="99" width="129" x="13" y="325"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<class id="5" language="java" name="com.iluwatar.api.gateway.MobileProduct" project="api-gateway"
file="/api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/MobileProduct.java" binary="false" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="376" y="293"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<interface id="6" language="java" name="com.iluwatar.api.gateway.PriceClient" project="api-gateway"
file="/api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/PriceClient.java" binary="false" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="222" y="231"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</interface>
<class id="7" language="java" name="com.iluwatar.api.gateway.PriceClientImpl" project="api-gateway"
file="/api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/PriceClientImpl.java" binary="false" corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="223" y="374"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<association id="8">
<end type="SOURCE" refId="1" navigable="false">
<attribute id="9" name="imageClient"/>
<multiplicity id="10" minimum="0" maximum="1"/>
</end>
<end type="TARGET" refId="3" navigable="true"/>
<display labels="true" multiplicity="true"/>
</association>
<realization id="11">
<end type="SOURCE" refId="4"/>
<end type="TARGET" refId="3"/>
</realization>
<association id="12">
<end type="SOURCE" refId="1" navigable="false">
<attribute id="13" name="priceClient"/>
<multiplicity id="14" minimum="0" maximum="1"/>
</end>
<end type="TARGET" refId="6" navigable="true"/>
<display labels="true" multiplicity="true"/>
</association>
<realization id="15">
<end type="SOURCE" refId="7"/>
<end type="TARGET" refId="6"/>
</realization>
<classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</classifier-display>
<association-display labels="true" multiplicity="true"/>
</class-diagram>
microservices-api-gateway/etc/api-gateway.urm.puml
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@startuml
@enduml
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microservices-api-gateway/image-microservice/etc/image-microservice.ucls
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<?xml version="1.0" encoding="UTF-8"?>
<class-diagram version="1.1.9" icons="true" automaticImage="PNG" always-add-relationships="false" generalizations="true"
realizations="true" associations="true" dependencies="false" nesting-relationships="true" router="FAN">
<class id="1" language="java" name="com.iluwatar.image.microservice.ImageController" project="image-microservice"
file="/image-microservice/src/main/java/com/iluwatar/image/microservice/ImageController.java" binary="false"
corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="87" y="61"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</classifier-display>
<association-display labels="true" multiplicity="true"/>
</class-diagram>
microservices-api-gateway/image-microservice/etc/image-microservice.urm.puml
+12
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@startuml
package com.iluwatar.image.microservice {
class ImageApplication {
+ ImageApplication()
+ main(args : String[]) {static}
}
class ImageController {
+ ImageController()
+ getImagePath() : String
}
}
@enduml
microservices-api-gateway/image-microservice/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!--
This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
The MIT License
Copyright © 2014-2022 Ilkka Seppälä
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>microservices-api-gateway</artifactId>
<groupId>com.iluwatar</groupId>
<version>1.26.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>image-microservice</artifactId>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<configuration>
<archive>
<manifest>
<mainClass>com.iluwatar.image.microservice.ImageApplication</mainClass>
</manifest>
</archive>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
microservices-api-gateway/image-microservice/src/main/java/com/iluwatar/image/microservice/ImageApplication.java
+45
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.image.microservice;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* ImageApplication starts up Spring Boot, exposing endpoints for the Image microservice through the
* {@link ImageController}.
*/
@SpringBootApplication
public class ImageApplication {
/**
* Microservice entry point.
*
* @param args command line args
*/
public static void main(String[] args) {
SpringApplication.run(ImageApplication.class, args);
}
}
microservices-api-gateway/image-microservice/src/main/java/com/iluwatar/image/microservice/ImageController.java
+49
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.image.microservice;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* Exposes the Image microservice's endpoints.
*/
@Slf4j
@RestController
public class ImageController {
/**
* An endpoint for a user to retrieve an image path.
*
* @return An image path
*/
@GetMapping("/image-path")
public String getImagePath() {
LOGGER.info("Successfully found image path");
return "/product-image.png";
}
}
microservices-api-gateway/image-microservice/src/main/resources/application.properties
+24
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@@ -0,0 +1,24 @@
#
# The MIT License
# Copyright © 2014-2021 Ilkka Seppälä
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
server.port=50005
microservices-api-gateway/image-microservice/src/test/java/com/iluwatar/image/microservice/ImageControllerTest.java
+42
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.image.microservice;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
/**
* Test for Image Rest Controller
*/
class ImageControllerTest {
@Test
void testGetImagePath() {
var imageController = new ImageController();
var imagePath = imageController.getImagePath();
assertEquals("/product-image.png", imagePath);
}
}
microservices-api-gateway/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!--
This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
The MIT License
Copyright © 2014-2022 Ilkka Seppälä
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>java-design-patterns</artifactId>
<groupId>com.iluwatar</groupId>
<version>1.26.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>microservices-api-gateway</artifactId>
<packaging>pom</packaging>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<type>pom</type>
<version>3.2.4</version>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<modules>
<module>image-microservice</module>
<module>price-microservice</module>
<module>api-gateway-service</module>
</modules>
</project>
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microservices-api-gateway/price-microservice/etc/price-microservice.ucls
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<?xml version="1.0" encoding="UTF-8"?>
<class-diagram version="1.1.9" icons="true" automaticImage="PNG" always-add-relationships="false" generalizations="true"
realizations="true" associations="true" dependencies="false" nesting-relationships="true" router="FAN">
<class id="1" language="java" name="com.iluwatar.price.microservice.PriceController" project="price-microservice"
file="/price-microservice/src/main/java/com/iluwatar/price/microservice/PriceController.java" binary="false"
corner="BOTTOM_RIGHT">
<position height="-1" width="-1" x="82" y="63"/>
<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</display>
</class>
<classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
sort-features="false" accessors="true" visibility="true">
<attributes public="true" package="true" protected="true" private="true" static="true"/>
<operations public="true" package="true" protected="true" private="true" static="true"/>
</classifier-display>
<association-display labels="true" multiplicity="true"/>
</class-diagram>
microservices-api-gateway/price-microservice/etc/price-microservice.urm.puml
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@startuml
package com.iluwatar.price.microservice {
class PriceApplication {
+ PriceApplication()
+ main(args : String[]) {static}
}
class PriceController {
+ PriceController()
+ getPrice() : String
}
}
@enduml
microservices-api-gateway/price-microservice/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!--
This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
The MIT License
Copyright © 2014-2022 Ilkka Seppälä
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>microservices-api-gateway</artifactId>
<groupId>com.iluwatar</groupId>
<version>1.26.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>price-microservice</artifactId>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<configuration>
<archive>
<manifest>
<mainClass>com.iluwatar.price.microservices.PriceApplication</mainClass>
</manifest>
</archive>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
microservices-api-gateway/price-microservice/src/main/java/com/iluwatar/price/microservice/PriceApplication.java
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.price.microservice;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* PriceApplication starts up Spring Boot, exposing endpoints for the Price microservice through the
* {@link PriceController}.
*/
@SpringBootApplication
public class PriceApplication {
/**
* Microservice entry point.
*
* @param args command line args
*/
public static void main(String[] args) {
SpringApplication.run(PriceApplication.class, args);
}
}
microservices-api-gateway/price-microservice/src/main/java/com/iluwatar/price/microservice/PriceController.java
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.price.microservice;
import lombok.RequiredArgsConstructor;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* Exposes the Price microservice's endpoints.
*/
@RestController
@RequiredArgsConstructor
public class PriceController {
private final PriceService priceService;
/**
* An endpoint for a user to retrieve a product's price.
*
* @return A product's price
*/
@GetMapping("/price")
public String getPrice() {
return priceService.getPrice();
}
}
microservices-api-gateway/price-microservice/src/main/java/com/iluwatar/price/microservice/PriceService.java
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.price.microservice;
/**
* Service to get a product's price.
*/
public interface PriceService {
/**
* Getting the price of a product.
*
* @return A product's price
*/
String getPrice();
}
microservices-api-gateway/price-microservice/src/main/java/com/iluwatar/price/microservice/PriceServiceImpl.java
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.price.microservice;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
/**
* {@inheritDoc}
*/
@Service
@Slf4j
public class PriceServiceImpl implements PriceService {
/**
* {@inheritDoc}
*/
@Override
public String getPrice() {
LOGGER.info("Successfully found price info");
return "20";
}
}
microservices-api-gateway/price-microservice/src/main/resources/application.properties
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#
# The MIT License
# Copyright © 2014-2021 Ilkka Seppälä
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
server.port=50006
microservices-api-gateway/price-microservice/src/test/java/com/iluwatar/price/microservice/PriceControllerTest.java
+42
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/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.price.microservice;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
/**
* Test for Price Rest Controller
*/
class PriceControllerTest {
@Test
void getPriceTest() {
var priceController = new PriceController(new PriceServiceImpl());
var price = priceController.getPrice();
assertEquals("20", price);
}
}
microservices-api-gateway/price-microservice/src/test/java/com/iluwatar/price/microservice/PriceServiceTest.java
+42
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@@ -0,0 +1,42 @@
/*
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
*
* The MIT License
* Copyright © 2014-2022 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.price.microservice;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
/**
* Test for Price Service
*/
class PriceServiceTest {
@Test
void getPriceTest() {
var priceService = new PriceServiceImpl();
var price = priceService.getPrice();
assertEquals("20", price);
}
}