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package org.testng.internal;
import org.testng.TestNGException;
import org.testng.collections.Lists;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
/**
* Simple wrapper for an ExecutorCompletionService.
*/
public class PoolService<FutureType> {
private ExecutorCompletionService<FutureType> m_completionService;
private ThreadFactory m_threadFactory;
private ExecutorService m_executor;
public PoolService(int threadPoolSize) {
m_threadFactory = new ThreadFactory() {
private int m_threadIndex = 0;
@Override
public Thread newThread(Runnable r) {
Thread result = new Thread(r);
result.setName("PoolService-" + m_threadIndex);
m_threadIndex++;
return result;
}
};
m_executor = Executors.newFixedThreadPool(threadPoolSize, m_threadFactory);
m_completionService = new ExecutorCompletionService<>(m_executor);
}
public List<FutureType> submitTasksAndWait(List<? extends Callable<FutureType>> tasks) {
List<FutureType> result = Lists.newArrayList();
for (Callable<FutureType> callable : tasks) {
m_completionService.submit(callable);
}
for (int i = 0; i < tasks.size(); i++) {
try {
Future<FutureType> take = m_completionService.take();
result.add(take.get());
} catch (InterruptedException | ExecutionException e) {
throw new TestNGException(e);
}
}
m_executor.shutdown();
return result;
}
}
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