TestExecutor.java

/**
 * Copyright (c) 2009-2011 VMware, Inc. All Rights Reserved.
 *
 * 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 com.springsource.insight.plugin.runexec;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Executor;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;

/**
 *
 */
public class TestExecutor implements Executor, Runnable {
    private Runnable _command;
    private final boolean _runCommand, _runAsync;
    private final BlockingQueue<Thread> _threadsQueue = new LinkedBlockingQueue<Thread>();

    public TestExecutor(boolean runCommand, boolean runAsync) {
        _runCommand = runCommand;
        _runAsync = runAsync;
    }

    public void execute(Runnable command) {
        if (_command != null) {
            throw new IllegalStateException("Command already run");
        }

        if ((_command = command) == null) {
            throw new IllegalArgumentException("No command to run");
        }

        if (_runCommand) {
            if (_runAsync) {
                Thread t = new Thread(this, "tAsyncCommand" + System.nanoTime());
                t.start();
            } else {
                run();
            }
        }
    }

    public void run() {
        Thread curThread = Thread.currentThread();
        _command.run();
        try {
            if (!_threadsQueue.offer(curThread, 5L, TimeUnit.SECONDS)) {
                throw new IllegalStateException("Failed to signal end of run");
            }
        } catch (InterruptedException e) {
            throw new IllegalStateException("Interrupted");
        }
    }

    public Thread waitForThread() throws InterruptedException {
        if (!_runCommand) {
            return Thread.currentThread();
        }

        Thread t = _threadsQueue.poll(10L, TimeUnit.SECONDS);
        if (t == null) {
            throw new IllegalStateException("No thread returned");
        }

        if (_runAsync) {
            t.join(TimeUnit.SECONDS.toMillis(5L));
            if (t.isAlive()) {
                throw new IllegalStateException("Thread still running after end signalled");
            }
        }

        return t;
    }

    public Runnable getLastRunCommand() {
        return _command;
    }
}