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#297 Create Spring Boot-backed API Gateway that aggregates calls to the Image and Price microservices

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tmcconville
2016-04-02 18:25:13 -05:00
parent 01737bc643
commit 665256ecc0
14 changed files with 208 additions and 73 deletions
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api-gateway/src/main/java/com/iluwatar/api/gateway/App.java
+12 -14
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@@ -1,5 +1,8 @@
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,
@@ -18,13 +21,15 @@ package com.iluwatar.api.gateway;
*
* <p>
* This implementation shows what the API Gateway pattern could look like for an e-commerce site.
* In this case, the (@link ImageService) and (@link PriceService) represent our microservices.
* 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).
* 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 {
/**
@@ -34,13 +39,6 @@ public class App {
* command line args
*/
public static void main(String[] args) {
ApiGateway apiGateway = new ApiGateway();
DesktopProduct desktopProduct = apiGateway.getProductDesktop();
System.out.println(String.format("Desktop Product \nPrice: %s\nImage path: %s",
desktopProduct.getPrice(), desktopProduct.getImagePath()));
MobileProduct mobileProduct = apiGateway.getProductMobile();
System.out.println(String.format("Mobile Product \nPrice: %s", mobileProduct.getPrice()));
SpringApplication.run(App.class, args);
}
}