Spring Framework example source code file (DelegatingTimerTask.java)

This example Spring Framework source code file (DelegatingTimerTask.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Spring Framework tags/keywords

delegate, delegate, delegatingtimertask, delegatingtimertask, log, runnable, runnable, throwable, timertask, timertask, unexpected, util

The Spring Framework DelegatingTimerTask.java source code

/*
 * Copyright 2002-2007 the original author or authors.
 *
 * 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.springframework.scheduling.timer;

import java.util.TimerTask;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.util.Assert;

/**
 * Simple {@link java.util.TimerTask} adapter that delegates to a
 * given {@link java.lang.Runnable}.
 *
 * <p>This is often preferable to deriving from TimerTask, to be able to
 * implement an interface rather than extend an abstract base class.
 *
 * @author Juergen Hoeller
 * @since 1.2.4
 */
public class DelegatingTimerTask extends TimerTask {

	private static final Log logger = LogFactory.getLog(DelegatingTimerTask.class);

	private final Runnable delegate;


	/**
	 * Create a new DelegatingTimerTask.
	 * @param delegate the Runnable implementation to delegate to
	 */
	public DelegatingTimerTask(Runnable delegate) {
		Assert.notNull(delegate, "Delegate must not be null");
		this.delegate = delegate;
	}

	/**
	 * Return the wrapped Runnable implementation.
	 */
	public final Runnable getDelegate() {
		return this.delegate;
	}


	/**
	 * Delegates execution to the underlying Runnable, catching any exception
	 * or error thrown in order to continue scheduled execution.
	 */
	public void run() {
		try {
			this.delegate.run();
		}
		catch (Throwable ex) {
			logger.error("Unexpected exception thrown from Runnable", ex);
			// Do not throw the exception, else the main loop of the Timer might stop!
		}
	}

}