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PatternTesting Concurrent (patterntesting-concurrent) is a collection of useful thread aspects. It has support for testing, for sychnronization and for concurrent programming. Some of the ideas used in this library comes from reading Brian Goetz's book "Java Concurrency in Practice".

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/**
 * $Id: DeadLockLogger.java,v 1.7 2016/12/18 21:56:49 oboehm Exp $
 *
 * Copyright (c) 2009 by Oliver Boehm
 *
 * 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 orimplied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * (c)reated 14.07.2009 by oliver ([email protected])
 */

package patterntesting.concurrent;

import org.apache.logging.log4j.*;

import patterntesting.runtime.util.Converter;

/**
 * The Class DeadLockLogger.
 *
 * @author oliver
 * @version $Revision: 1.7 $
 * @since 14.07.2009
 */
public final class DeadLockLogger implements DeadLockListener {

	private static final Logger LOG = LogManager.getLogger(DeadLockLogger.class);

	/**
	 * Dead lock detected.
	 *
	 * @param threads the threads
	 * @see patterntesting.concurrent.DeadLockListener#deadLockDetected(java.lang.Thread[])
	 */
	public void deadLockDetected(final Thread[] threads) {
		if (LOG.isWarnEnabled()) {
			LOG.warn("deadlock in " + threads.length + " threads detected: "
					+ Converter.toString(threads));
		}
	    for (int i = 0; i < threads.length; i++) {
            dumpThread(threads[i]);
        }
	}

    private void dumpThread(Thread thread) {
        StackTraceElement[] stackTrace = thread.getStackTrace();
        if (stackTrace.length == 0) {
            LOG.info("{} is blocked but there is no stacktrace available.", thread);
        } else if (LOG.isDebugEnabled()) {
            StringBuilder buf = new StringBuilder();
            for (StackTraceElement element : stackTrace) {
                buf.append("\n\tat ");
                buf.append(element);
            }
            LOG.debug("{} is blocked{}", thread, buf);
        } else if (LOG.isInfoEnabled()) {
            LOG.info("{} is blocked at {}.", thread, stackTrace[0]);
        }
    }

}