io.druid.java.util.common.concurrent.DummyExecutorService Maven / Gradle / Ivy
/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package io.druid.java.util.common.concurrent;
import java.util.Collection;
import java.util.Collections;
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.TimeUnit;
import java.util.concurrent.TimeoutException;
/**
* ExecutorService which is terminated and shutdown from the moment of creation and not able to accept any tasks.
*/
final class DummyExecutorService implements ExecutorService
{
static final DummyExecutorService INSTANCE = new DummyExecutorService();
private DummyExecutorService()
{
}
@Override
public void shutdown()
{
// Do nothing, alread shutdown
}
@Override
public List shutdownNow()
{
return Collections.emptyList();
}
@Override
public boolean isShutdown()
{
return true;
}
@Override
public boolean isTerminated()
{
return true;
}
@Override
public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException
{
return true;
}
@Override
public Future submit(Callable task)
{
throw new UnsupportedOperationException();
}
@Override
public Future submit(Runnable task, T result)
{
throw new UnsupportedOperationException();
}
@Override
public Future submit(Runnable task)
{
throw new UnsupportedOperationException();
}
@Override
public List> invokeAll(Collection> tasks) throws InterruptedException
{
throw new UnsupportedOperationException();
}
@Override
public List> invokeAll(
Collection> tasks, long timeout, TimeUnit unit
) throws InterruptedException
{
throw new UnsupportedOperationException();
}
@Override
public T invokeAny(Collection> tasks) throws InterruptedException, ExecutionException
{
throw new UnsupportedOperationException();
}
@Override
public T invokeAny(Collection> tasks, long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException, TimeoutException
{
throw new UnsupportedOperationException();
}
@Override
public void execute(Runnable command)
{
throw new UnsupportedOperationException();
}
}