BlockingRejectedExecutionHandler.java

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 Lachlan Dowding
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package permafrost.tundra.util.concurrent;

import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * A RejectedExecutionHandler which blocks until the rejected command can be queued for execution
 * by the rejecting ThreadPoolExecutor.
 */
public class BlockingRejectedExecutionHandler implements RejectedExecutionHandler {
    /**
     * Handles a rejected command by blocking until it can be queued for execution by the rejecting
     * ThreadPoolExecutor.
     *
     * @param command  The command which was rejected and will be re-queued for execution.
     * @param executor The executor which rejected the command.
     */
    @Override
    public void rejectedExecution(Runnable command, ThreadPoolExecutor executor) {
        if (!executor.isShutdown()) {
            try {
                executor.getQueue().put(command);
            } catch (InterruptedException e) {
                // do nothing
            }
        }
    }
}