Async.java

/**
 *
 * Copyright 2014 Florian Schmaus
 *
 * 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.jivesoftware.smack.util;

import java.util.logging.Level;
import java.util.logging.Logger;

public class Async {

    /**
     * Creates a new thread with the given Runnable, marks it daemon, starts it and returns the started thread.
     *
     * @param runnable
     * @return the started thread.
     */
    public static Thread go(Runnable runnable) {
        Thread thread = daemonThreadFrom(runnable);
        thread.start();
        return thread;
    }

    /**
     * Creates a new thread with the given Runnable, marks it daemon, sets the name, starts it and returns the started
     * thread.
     *
     * @param runnable
     * @param threadName the thread name.
     * @return the started thread.
     */
    public static Thread go(Runnable runnable, String threadName) {
        Thread thread = daemonThreadFrom(runnable);
        thread.setName(threadName);
        thread.start();
        return thread;
    }

    public static Thread daemonThreadFrom(Runnable runnable) {
        Thread thread = new Thread(runnable);
        thread.setDaemon(true);
        return thread;
    }

    /**
     * Like {@link Runnable}, but allows the <code>runOrThrow()</code> method to throw an exception.
     * <p>
     * If the exception is an instance of {@link RuntimeException}, then it will be re-thrown, otherwise <b>it will be
     * simply logged.</b>
     */
    public abstract static class ThrowingRunnable implements Runnable {

        public static final Logger LOGGER = Logger.getLogger(ThrowingRunnable.class.getName());

        @Override
        public final void run() {
            try {
                runOrThrow();
            }
            catch (Exception e) {
                if (e instanceof RuntimeException) {
                    throw (RuntimeException) e;
                }
                LOGGER.log(Level.WARNING, "Caught Exception", e);
            }
        }

        public abstract void runOrThrow() throws Exception;
    }
}