| /* |
| * 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 invokeAny(tasks, timeout, unit); |
| } |
| |
| @Override |
| public void execute(Runnable command) { |
| executor.execute(command); |
| } |
| |
| } |