https://github.com/parkghost/spring-asynchronous-future-composition
Spring framework @Async + google guava ListenableFuture
https://github.com/parkghost/spring-asynchronous-future-composition
Last synced: about 1 month ago
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Spring framework @Async + google guava ListenableFuture
- Host: GitHub
- URL: https://github.com/parkghost/spring-asynchronous-future-composition
- Owner: parkghost
- Created: 2012-11-28T23:01:38.000Z (over 12 years ago)
- Default Branch: master
- Last Pushed: 2013-01-14T12:14:16.000Z (over 12 years ago)
- Last Synced: 2025-04-06T09:06:18.912Z (about 2 months ago)
- Language: Java
- Homepage:
- Size: 137 KB
- Stars: 17
- Watchers: 3
- Forks: 8
- Open Issues: 0
-
Metadata Files:
- Readme: readme.md
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README
Below code snippet combine Guava ListenableFuture and spring @Async for non-blocking way to fetch process result and chaining.
### Configuration:
1\. add `ListeningThreadPoolTaskExecutor` class to project classpath
```java
package org.springframework.scheduling.concurrent;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;
import java.util.concurrent.RejectedExecutionException;
import org.springframework.core.task.TaskRejectedException;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;
public class ListeningThreadPoolTaskExecutor extends ThreadPoolTaskExecutor {
@Override
public Future> submit(Runnable task) {
ListeningExecutorService executor = MoreExecutors.listeningDecorator(getThreadPoolExecutor());
try {
return executor.submit(task);
} catch (RejectedExecutionException ex) {
throw new TaskRejectedException("Executor [" + executor + "] did not accept task: " + task, ex);
}
}
@Override
public Future submit(Callable task) {
ListeningExecutorService executor = MoreExecutors.listeningDecorator(getThreadPoolExecutor());
try {
return executor.submit(task);
} catch (RejectedExecutionException ex) {
throw new TaskRejectedException("Executor [" + executor + "] did not accept task: " + task, ex);
}
}
}
```
2\. add `taskExecutor` bean defintion to xml configuration
```xml
````
### Example:
```java
@Service
public class SearchService {
@Async
public Future search(String keyword) {
SearchResult result = ... //do some blocking or heavy operation here
return new AsyncResult(result);
}
}
@Service
public class SearchApplication {
public void runWithFutureCallback() {
ListenableFuture future1 = (ListenableFuture) searchService.search("Joshua Bloch");
Futures.addCallback(future1, new FutureCallback() {
public void onSuccess(SearchResult result) {
logger.debug("search keyword:{} found:{} totalTime:{}ms", new Object[] { result.getKeyword(), result.getRecords(), result.getTotalTime() });
}
public void onFailure(Throwable thrown) {
logger.warn(thrown.getMessage());
}
});
}
}
```
For full example, please look in the `src/main/java/me/brandon/application` directory.
*the console output from full example*
2012-11-29 14:26:01,045 [main] INFO me.brandon.application.Main - starting application
2012-11-29 14:26:01,869 [taskExecutor-1] DEBUG me.brandon.application.SearchService - search keyword:Joshua Bloch
2012-11-29 14:26:01,869 [taskExecutor-3] DEBUG me.brandon.application.SearchService - search keyword:Joshua Bloch
2012-11-29 14:26:01,869 [taskExecutor-4] DEBUG me.brandon.application.SearchService - search keyword:Martin Odersky
2012-11-29 14:26:01,869 [taskExecutor-5] DEBUG me.brandon.application.SearchService - search keyword:Brian Goetz
2012-11-29 14:26:01,869 [taskExecutor-2] DEBUG me.brandon.application.SearchService - search keyword:Martin Fowler
2012-11-29 14:26:02,874 [taskExecutor-3] DEBUG me.brandon.application.SearchService - search keyword:Bruce Eckel
2012-11-29 14:26:03,871 [taskExecutor-5] DEBUG me.brandon.application.SearchService - search keyword:Martin Fowler
2012-11-29 14:26:03,871 [taskExecutor-1] DEBUG me.brandon.application.SearchApplication - search keyword:Joshua Bloch found:[Effective Java, Java Concurrency in Practice, JavaTM Puzzlers, Java Concurrency in Practice] totalTime:2002ms
2012-11-29 14:26:09,875 [taskExecutor-5] DEBUG me.brandon.application.SearchApplication - search keyword:Joshua BlochMartin OderskyBrian GoetzBruce Eckel found:[Thinking in C++, JavaTM Puzzlers, Thinking in Java, Programming in Scala, Effective Java, Java Concurrency in Practice] totalTime:7001ms
2012-11-29 14:26:10,870 [taskExecutor-2] WARN me.brandon.application.SearchApplication - the keyword 'Martin Fowler'did not match any records
2012-11-29 14:26:10,871 [main] INFO me.brandon.application.Main - leaving application
### Reference:
1. [Google Guava ListenableFutureExplained](http://code.google.com/p/guava-libraries/wiki/ListenableFutureExplained)
2. [Spring Asynchronous Execution](http://static.springsource.org/spring/docs/3.0.x/reference/scheduling.html#scheduling-annotation-support-async)