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Ilkka Seppälä
123 lines
4.1 KiB
Markdown
123 lines
4.1 KiB
Markdown
---
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title: Mute Idiom
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category: Behavioral
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language: en
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tag:
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- Context
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- Decoupling
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- Idiom
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- Error handling
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- Synchronization
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- Thread management
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---
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## Intent
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The Mute Idiom is designed to simplify error handling by muting exceptions that are deemed non-critical or expected in specific contexts, especially within multithreaded or complex control flow environments.
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## Explanation
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Real World Example
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> The vending machine contained in your office displays a warning when making a transaction. The issue occurs when the
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In plain words
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> The Mute Idiom design pattern is used to reduce the requirement of catching exceptions when they cannot be thrown or
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**Programmatic Example**
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Sure, here's a programmatic example of the Mute Idiom design pattern based on the code in the module:
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## Explanation
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The Mute Idiom is a design pattern that is used to simplify error handling by muting exceptions that are deemed non-critical or expected in specific contexts. This pattern is particularly useful in multithreaded or complex control flow environments.
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## Programmatic Example
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We have a `Resource` interface that has a `close` method which throws an `IOException`.
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```java
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public interface Resource extends AutoCloseable {
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@Override
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void close() throws IOException;
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}
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```
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We also have an `App` class that uses this `Resource`. In the `App` class, we have a `useOfLoggedMute` method that demonstrates the use of the Mute Idiom. Here, we acquire a `Resource`, utilize it, and then attempt to close it. The closing of the resource is done in a `finally` block to ensure that it is executed regardless of whether an exception is thrown or not.
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```java
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public class App {
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// ...
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private static void useOfLoggedMute() {
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Optional<Resource> resource = Optional.empty();
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try {
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resource = Optional.of(acquireResource());
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utilizeResource(resource.get());
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} finally {
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resource.ifPresent(App::closeResource);
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}
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}
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// ...
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}
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```
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The `closeResource` method is where the Mute Idiom is applied. We use the `Mute.loggedMute` method to suppress any `IOException` that might be thrown when closing the resource. This is done because the failure to close a resource is considered a non-critical issue that does not affect the overall logic or outcome of the program.
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```java
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public class App {
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// ...
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private static void closeResource(Resource resource) {
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Mute.loggedMute(resource::close);
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}
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// ...
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}
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```
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In this way, the Mute Idiom allows us to simplify error handling by reducing boilerplate code for expected exceptions, enhancing code readability and maintainability, and allowing uninterrupted execution for non-critical exceptions.
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## Class diagram
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## Applicability
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* Useful in scenarios where certain exceptions are predictable and do not affect the overall logic or outcome.
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* Commonly used in logging, cleanup operations, or when working with APIs that signal non-critical issues via exceptions.
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## Tutorials
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* [JOOQ: Mute Design Pattern](http://blog.jooq.org/2016/02/18/the-mute-design-pattern/)
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## Known Uses
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* Muting exceptions in background tasks or threads where interruption is expected.
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* Handling known issues in third-party libraries where exceptions can be safely ignored.
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## Consequences
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Benefits:
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* Simplifies error handling by reducing boilerplate code for expected exceptions.
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* Enhances code readability and maintainability.
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* Allows uninterrupted execution for non-critical exceptions.
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Trade-offs:
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* Can lead to missed critical issues if overused or misapplied.
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* Makes debugging harder if exceptions are muted indiscriminately.
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## Related Patterns
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* [Null Object](https://java-design-patterns.com/patterns/null-object/): Both aim to simplify error handling; Null Object avoids null checks while Mute Idiom avoids exception handling complexities.
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* [Decorator](https://java-design-patterns.com/patterns/decorator/): Can be used to wrap functionality with additional error handling or muting behaviors.
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## Credits
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* [Effective Java](https://amzn.to/4cGk2Jz)
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* [Java Concurrency in Practice](https://amzn.to/4aRMruW)
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