/*
 * Copyright (c) 2014, 2015, Dynatrace and/or its affiliates. All rights reserved.
 * 
 * This file is part of the Lock Contention Tracing Subsystem for the HotSpot
 * Virtual Machine, which is developed at Christian Doppler Laboratory on
 * Monitoring and Evolution of Very-Large-Scale Software Systems. Please
 * contact us at <http://mevss.jku.at/> if you need additional information
 * or have any questions.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work. If not, see <http://www.gnu.org/licenses/>.
 *
 */ 
package sun.evtracing.processing.statistics;

import sun.evtracing.parser.metadata.JavaStack;
import sun.evtracing.parser.metadata.JavaStackFrame;
import sun.evtracing.parser.metadata.JavaThread;
import sun.evtracing.processing.Sanity;
import sun.evtracing.processing.statistics.aggregator.ContentionProcessor;
import sun.evtracing.processing.statistics.metadata.ParkEventTuple;

public class ParkBlockerReentrantReadWriteLockAnalyser extends ParkBlockerAbstractQueuedSynchronizerAnalyser {
	public ParkBlockerReentrantReadWriteLockAnalyser(ContentionProcessor cproc) {
		super(cproc);
	}

	@Override
	boolean isShared(ParkEventTuple cur) {
		for (JavaStackFrame f : cur.unpark().stack().metadata()) {
			switch (f.method().clazz().name()) {
			case "java/util/concurrent/locks/ReentrantReadWriteLock$ReadLock":
				return true;
			case "java/util/concurrent/locks/ReentrantReadWriteLock$WriteLock":
				return false;
			}
		}
		Sanity.warn("unknown lock type, maybe spurious wakeup");
		return false;
	}

	@Override
	JavaThread sharedThread() {
		return JavaThread.READERS;
	}

	@Override
	JavaStack sharedSite() {
		return JavaStack.READERS;
	}
}