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MarkingEngine.java

/*
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 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common
 * Development and Distribution License("CDDL") (collectively, the
 * "License"). You may not use this file except in compliance with the
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package org.netbeans.lib.profiler.results.cpu.marking;

import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import org.netbeans.lib.profiler.marker.Mark;
import org.netbeans.lib.profiler.client.ClientUtils;
import org.netbeans.lib.profiler.global.ProfilingSessionStatus;
import java.util.Iterator;
import java.util.Set;
import org.netbeans.lib.profiler.marker.Marker;


/**
 *
 * @author Jaroslav Bachorik
 */
00058 public class MarkingEngine {
    //~ Inner Interfaces ---------------------------------------------------------------------------------------------------------

    public static interface StateObserver {
        //~ Methods --------------------------------------------------------------------------------------------------------------

        void stateChanged(MarkingEngine instance);
    }

    //~ Static fields/initializers -----------------------------------------------------------------------------------------------

    private static MarkingEngine instance;

    //~ Instance fields ----------------------------------------------------------------------------------------------------------

    private final Object markGuard = new Object();

    final private MarkMapper mapper;

    // @GuardedBy markGuard
    private String[] labels;

    // @GuardedBy markGuard
    private MarkMapping[] marks;

    private Set observers = new HashSet();

    //~ Constructors -------------------------------------------------------------------------------------------------------------

    /**
     * Creates a new instance of MarkingEngine
     */
00090     private MarkingEngine() {
        mapper = new MarkMapper();
    }

    //~ Methods ------------------------------------------------------------------------------------------------------------------

    public static synchronized MarkingEngine getDefault() {
        if (instance == null) {
            instance = new MarkingEngine();
        }

        return instance;
    }

    // configure the engine for a given set of {@linkplain MarkMapping}
    public synchronized void configure(MarkMapping[] mappings, Collection observers) {
        setMarks(mappings != null ? mappings : Marker.DEFAULT.getMappings());
        this.observers.clear();
        this.observers.addAll(observers);
    }

    public synchronized void deconfigure() {
        setMarks(Marker.DEFAULT.getMappings());
    }

    public ClientUtils.SourceCodeSelection[] getMarkerMethods() {
        synchronized (markGuard) {
            if (marks == null) {
                return new ClientUtils.SourceCodeSelection[0];
            }

            ClientUtils.SourceCodeSelection[] methods = new ClientUtils.SourceCodeSelection[marks.length];

            for (int i = 0; i < marks.length; i++) {
                methods[i] = marks[i].markMask;
            }

            return methods;
        }
    }

    public int getNMarks() {
        synchronized (markGuard) {
            return (labels != null) ? labels.length : 0;
        }
    }

    public Mark markMethod(int methodId, ProfilingSessionStatus status) {
        synchronized(mapper) {
            return mapper.getMark(methodId, status);
        }
    }

    Mark mark(int methodId, ProfilingSessionStatus status) {
        ClientUtils.SourceCodeSelection method = null;

        synchronized (markGuard) {
            if (marks == null) {
                return Mark.DEFAULT;
            }

            status.beginTrans(false);

            try {
                method = new ClientUtils.SourceCodeSelection(status.getInstrMethodClasses()[methodId],
                                                             status.getInstrMethodNames()[methodId],
                                                             status.getInstrMethodSignatures()[methodId]);
            } finally {
                status.endTrans();
            }

            String methodSig = method.toFlattened();

            for (int i = 0; i < marks.length; i++) {
                if (methodSig.startsWith(marks[i].markSig)) {
                    return marks[i].mark;
                }
            }

            return Mark.DEFAULT;
        }
    }

    private void setMarks(MarkMapping[] marks) {
        boolean stateChange = false;

        synchronized (markGuard) {
            stateChange = !Arrays.equals(this.marks,marks);
            this.marks = marks;
        }
        if (stateChange) {
            fireStateChanged();
        }
    }

    private void fireStateChanged() {
        for (Iterator iter = observers.iterator(); iter.hasNext();) {
            ((StateObserver) iter.next()).stateChanged(this);
        }
    }
}

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