delegatingexceptionproofrunnable.java

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/*
 * 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.support;

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

import org.springframework.util.Assert;

/**
 * Runnable wrapper that catches any exception or error thrown
 * from its delegate Runnable. Used for continuing scheduled
 * execution even after an exception thrown from a task's Runnable.
 *
 * @author Juergen Hoeller
 * @since 2.0.5
 */
public class DelegatingExceptionProofRunnable implements Runnable {

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

	private Runnable delegate;


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

	public final Runnable getDelegate() {
		return this.delegate;
	}


	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 scheduler might stop!
		}
	}

}