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