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LazyInitializingExecutorService.java
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LazyInitializingExecutorService.java
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package org.infinispan.executors;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.infinispan.commons.executors.ThreadPoolExecutorFactory;
import org.infinispan.factories.annotations.Stop;
import org.infinispan.factories.scopes.Scope;
import org.infinispan.factories.scopes.Scopes;
import org.infinispan.util.concurrent.WithinThreadExecutor;
/**
* A delegating executor that lazily constructs and initializes the underlying executor, since unused JDK executors
* are expensive.
*
* @author Manik Surtani
* @since 5.1
*/
@Scope(Scopes.GLOBAL)
public final class LazyInitializingExecutorService extends ManageableExecutorService<ExecutorService> implements ExecutorService {
private static final ExecutorService STOPPED;
static {
STOPPED = new WithinThreadExecutor();
STOPPED.shutdown();
}
private final ThreadPoolExecutorFactory<ExecutorService> executorFactory;
private final ThreadFactory threadFactory;
public LazyInitializingExecutorService(
ThreadPoolExecutorFactory<ExecutorService> executorFactory, ThreadFactory threadFactory) {
this.executorFactory = executorFactory;
this.threadFactory = threadFactory;
}
private void initIfNeeded() {
if (executor == null) {
synchronized (this) {
if (executor == null) {
executor = executorFactory.createExecutor(threadFactory);
}
}
}
}
@Override
public void shutdown() {
synchronized (this) {
if (executor == null) {
executor = STOPPED;
}
executor.shutdown();
}
}
@Stop
@Override
public List<Runnable> shutdownNow() {
synchronized (this) {
if (executor == null) {
executor = STOPPED;
}
return executor.shutdownNow();
}
}
@Override
public boolean isShutdown() {
return executor == null || executor.isShutdown();
}
@Override
public boolean isTerminated() {
return executor == null || executor.isTerminated();
}
@Override
public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
if (executor == null)
return true;
else
return executor.awaitTermination(timeout, unit);
}
@Override
public <T> Future<T> submit(Callable<T> task) {
initIfNeeded();
return executor.submit(task);
}
@Override
public <T> Future<T> submit(Runnable task, T result) {
initIfNeeded();
return executor.submit(task, result);
}
@Override
public Future<?> submit(Runnable task) {
initIfNeeded();
return executor.submit(task);
}
@Override
public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks) throws InterruptedException {
initIfNeeded();
return executor.invokeAll(tasks);
}
@Override
public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit) throws InterruptedException {
initIfNeeded();
return executor.invokeAll(tasks, timeout, unit);
}
@Override
public <T> T invokeAny(Collection<? extends Callable<T>> tasks) throws InterruptedException, ExecutionException {
initIfNeeded();
return executor.invokeAny(tasks);
}
@Override
public <T> T invokeAny(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
initIfNeeded();
return executor.invokeAny(tasks, timeout, unit);
}
@Override
public void execute(Runnable command) {
initIfNeeded();
executor.execute(command);
}
}