1 /*
   2  * Copyright (c) 2014, 2015, Dynatrace and/or its affiliates. All rights reserved.
   3  * 
   4  * This file is part of the Lock Contention Tracing Subsystem for the HotSpot
   5  * Virtual Machine, which is developed at Christian Doppler Laboratory on
   6  * Monitoring and Evolution of Very-Large-Scale Software Systems. Please
   7  * contact us at <http://mevss.jku.at/> if you need additional information
   8  * or have any questions.
   9  *
  10  * This code is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 only, as
  12  * published by the Free Software Foundation.
  13  *
  14  * This code is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17  * version 2 for more details (a copy is included in the LICENSE file that
  18  * accompanied this code).
  19  *
  20  * You should have received a copy of the GNU General Public License version
  21  * 2 along with this work. If not, see <http://www.gnu.org/licenses/>.
  22  *
  23  */ 
  24 package sun.evtracing.processing.statistics;
  25 
  26 import java.util.HashMap;
  27 import java.util.Map;
  28 
  29 import sun.evtracing.parser.MonitorContendedEnterEvent;
  30 import sun.evtracing.parser.MonitorContendedEnteredEvent;
  31 import sun.evtracing.parser.MonitorContendedExitedEvent;
  32 import sun.evtracing.parser.MonitorDeflateEvent;
  33 import sun.evtracing.parser.MonitorInflateEvent;
  34 import sun.evtracing.parser.metadata.JavaThread;
  35 import sun.evtracing.processing.statistics.aggregator.ContentionProcessor;
  36 import sun.evtracing.processing.statistics.metadata.JavaObject;
  37 import sun.evtracing.processing.statistics.metadata.JavaObjectStack;
  38 import sun.evtracing.processing.statistics.metadata.JavaImmutableSingleObjectStack;
  39 
  40 public class MonitorAnalyser {
  41 
  42         private final JavaObjectStack objectStack;
  43         private final ContentionProcessor processor;
  44         private final Map<JavaThread, MonitorContender> contenders = new HashMap<>();
  45 
  46         private MonitorAnalyser(JavaObjectStack object, ContentionProcessor processor) {
  47                 this.objectStack = object;
  48                 this.processor = processor;
  49         }
  50 
  51         public void enter(MonitorContendedEnterEvent event) {
  52                 assert !contenders.containsKey(event.thread().metadata());
  53                 contenders.put(event.thread().metadata(), MonitorContender.forEnter(objectStack, event, processor));
  54         }
  55 
  56         public void entered(MonitorContendedEnteredEvent event) {
  57                 MonitorContender owner = contenders.remove(event.thread().metadata());
  58                 owner.monitorContendedEntered(event);
  59         }
  60 
  61         public void exited(MonitorContendedExitedEvent event) {
  62                 contenders.values().forEach(c -> c.contenderExitedMonitor(event));
  63         }
  64 
  65         public void deflate(MonitorDeflateEvent event) {
  66                 assert contenders.isEmpty();
  67         }
  68 
  69         public static MonitorAnalyser forInflate(MonitorInflateEvent event, ContentionProcessor processor) {
  70                 JavaObject obj = JavaObject.get(event.object(), event.clazz().metadata());
  71                 return new MonitorAnalyser(new JavaImmutableSingleObjectStack(obj), processor);
  72         }
  73 
  74 }