lttng/org.eclipse.tracecompass.lttng2.kernel.ui/src/org/eclipse/tracecompass/internal/lttng2/kernel/ui/criticalpath/CriticalPathParameterProvider.java

   1 /*******************************************************************************
   2  * Copyright (c) 2015 École Polytechnique de Montréal
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *******************************************************************************/
   9
  10 package org.eclipse.tracecompass.internal.lttng2.kernel.ui.criticalpath;
  11
  12 import org.eclipse.tracecompass.analysis.graph.core.criticalpath.CriticalPathModule;
  13 import org.eclipse.tracecompass.analysis.os.linux.core.model.HostThread;
  14 import org.eclipse.tracecompass.analysis.os.linux.core.signals.TmfThreadSelectedSignal;
  15 import org.eclipse.tracecompass.internal.lttng2.kernel.core.analysis.graph.model.LttngWorker;
  16 import org.eclipse.tracecompass.tmf.core.analysis.IAnalysisModule;
  17 import org.eclipse.tracecompass.tmf.core.analysis.TmfAbstractAnalysisParamProvider;
  18 import org.eclipse.tracecompass.tmf.core.signal.TmfSignalHandler;
  19 import org.eclipse.tracecompass.tmf.core.signal.TmfSignalManager;
  20 import org.eclipse.tracecompass.tmf.core.signal.TmfTraceSelectedSignal;
  21 import org.eclipse.tracecompass.tmf.core.trace.ITmfTrace;
  22
  23 /**
  24  * Class that provides parameters to the critical path analysis for lttng kernel
  25  * traces
  26  *
  27  * @author Geneviève Bastien
  28  */
  29 public class CriticalPathParameterProvider extends TmfAbstractAnalysisParamProvider {
  30
  31     private static final String NAME = "Critical Path Lttng kernel parameter provider"; //$NON-NLS-1$
  32
  33     private HostThread fCurrentHostThread = null;
  34
  35     /**
  36      * Constructor
  37      */
  38     public CriticalPathParameterProvider() {
  39         super();
  40         TmfSignalManager.register(this);
  41     }
  42
  43     @Override
  44     public String getName() {
  45         return NAME;
  46     }
  47
  48     @Override
  49     public Object getParameter(String name) {
  50         if (name.equals(CriticalPathModule.PARAM_WORKER)) {
  51             final HostThread currentHostThread = fCurrentHostThread;
  52             if (currentHostThread == null) {
  53                 return null;
  54             }
  55             /* Try to find the worker for the critical path */
  56             IAnalysisModule mod = getModule();
  57             if ((mod != null) && (mod instanceof CriticalPathModule)) {
  58                 LttngWorker worker = new LttngWorker(currentHostThread, "", 0); //$NON-NLS-1$
  59                 return worker;
  60             }
  61         }
  62         return null;
  63     }
  64
  65     @Override
  66     public boolean appliesToTrace(ITmfTrace trace) {
  67         return true;
  68     }
  69
  70     private void setCurrentHostThread(HostThread hostThread) {
  71         if (!hostThread.equals(fCurrentHostThread)) {
  72             fCurrentHostThread = hostThread;
  73             notifyParameterChanged(CriticalPathModule.PARAM_WORKER);
  74         }
  75     }
  76
  77     /**
  78      * Signal handler to know that a thread was selected
  79      *
  80      * @param signal
  81      *            the thread was selected
  82      */
  83     @TmfSignalHandler
  84     public void tmfThreadSelectedSignalHander(TmfThreadSelectedSignal signal) {
  85         final TmfThreadSelectedSignal threadSignal = signal;
  86         if (threadSignal != null) {
  87             setCurrentHostThread(new HostThread(threadSignal.getTraceHost(), threadSignal.getThreadId()));
  88         }
  89     }
  90
  91     /**
  92      * Reset the selection when a new trace is selected
  93      *
  94      * @param signal The trace selected signal
  95      */
  96     @TmfSignalHandler
  97     public void traceSelected(TmfTraceSelectedSignal signal) {
  98         fCurrentHostThread = null;
  99     }
 100
 101 }