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/*
* Copyright 2015 Open Networking Laboratory
*
* Licensed 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 org.onlab.util;
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.TimeUnit;
import java.util.concurrent.TimeoutException;
/**
* Executor service wrapper for shared executors with safeguards on shutdown
* to prevent inadvertent shutdown.
*/
class SharedExecutorService implements ExecutorService {
private static final String NOT_ALLOWED = "Shutdown of shared executor is not allowed";
private ExecutorService executor;
/**
* Creates a wrapper for the given executor service.
*
* @param executor executor service to wrap
*/
SharedExecutorService(ExecutorService executor) {
this.executor = executor;
}
/**
* Returns the backing executor service.
*
* @return backing executor service
*/
ExecutorService backingExecutor() {
return executor;
}
/**
* Swaps the backing executor with a new one and shuts down the old one.
*
* @param executor new executor service
*/
void setBackingExecutor(ExecutorService executor) {
ExecutorService oldExecutor = this.executor;
this.executor = executor;
oldExecutor.shutdown();
}
@Override
public void shutdown() {
throw new UnsupportedOperationException(NOT_ALLOWED);
}
@Override
public List<Runnable> shutdownNow() {
throw new UnsupportedOperationException(NOT_ALLOWED);
}
@Override
public boolean isShutdown() {
return executor.isShutdown();
}
@Override
public boolean isTerminated() {
return executor.isTerminated();
}
@Override
public boolean awaitTermination(long timeout, TimeUnit unit)
throws InterruptedException {
return executor.awaitTermination(timeout, unit);
}
@Override
public <T> Future<T> submit(Callable<T> task) {
return executor.submit(task);
}
@Override
public <T> Future<T> submit(Runnable task, T result) {
return executor.submit(task, result);
}
@Override
public Future<?> submit(Runnable task) {
return executor.submit(task);
}
@Override
public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks)
throws InterruptedException {
return executor.invokeAll(tasks);
}
@Override
public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks,
long timeout, TimeUnit unit)
throws InterruptedException {
return executor.invokeAll(tasks, timeout, unit);
}
@Override
public <T> T invokeAny(Collection<? extends Callable<T>> tasks)
throws InterruptedException, ExecutionException {
return executor.invokeAny(tasks);
}
@Override
public <T> T invokeAny(Collection<? extends Callable<T>> tasks,
long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException, TimeoutException {
return executor.invokeAny(tasks, timeout, unit);
}
@Override
public void execute(Runnable command) {
executor.execute(command);
}
}
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