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AbstractDataFrameProcessor.java

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package org.netbeans.lib.profiler.results;

import org.netbeans.lib.profiler.ProfilerClient;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Level;
import java.util.logging.Logger;


/**
 *
 * @author Jaroslav Bachorik
 */
00057 public abstract class AbstractDataFrameProcessor implements DataFrameProcessor {
    //~ Inner Interfaces ---------------------------------------------------------------------------------------------------------

    protected static interface ListenerFunctor {
        //~ Methods --------------------------------------------------------------------------------------------------------------

        void execute(ProfilingResultListener listener);
    }

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

    protected static final Logger LOGGER = Logger.getLogger(DataFrameProcessor.class.getName());

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

    protected volatile ProfilerClient client = null;
    private final AtomicBoolean batchInProgress = new AtomicBoolean(false);
    private final Set listeners = Collections.synchronizedSet(new HashSet());

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

    public boolean hasListeners() {
        return !listeners.isEmpty();
    }

    public void processDataFrame(byte[] buffer) {
        try {
            fireBatchStart();
            doProcessDataFrame(buffer);
        } catch (Exception e) {
            LOGGER.log(Level.SEVERE, "Error while processing data frame", e);
        } finally {
            fireBatchStop();
        }
    }

    public void removeAllListeners() {
        Set tmpListeners = new HashSet(listeners);

        for (Iterator iter = tmpListeners.iterator(); iter.hasNext();) {
            ((ProfilingResultListener) iter.next()).shutdown();
        }

        listeners.clear();
    }

    public void reset() {
        fireReset();
    }

    public void shutdown() {
        // finalize the batch
        fireBatchStop();
        fireShutdown();
    }

    public void startup(ProfilerClient client) {
        this.client = client;
    }

    protected void addListener(final ProfilingResultListener listener) {
        listeners.add(listener);
    }

    protected abstract void doProcessDataFrame(byte[] buffer);

    protected void fireProfilingPoint(final int threadId, final int ppId, final long timeStamp) {
        foreachListener(new ListenerFunctor() {
                public void execute(ProfilingResultListener listener) {
                    listener.profilingPoint(threadId, ppId, timeStamp);
                }
            });
    }

    protected void fireReset() {
        foreachListener(new ListenerFunctor() {
                public void execute(ProfilingResultListener listener) {
                    listener.reset();
                }
            });
    }

    protected void foreachListener(ListenerFunctor functor) {
        //    Set tmpListeners = null;
        //    synchronized(listeners) {
        //      tmpListeners = new HashSet(listeners);
        //    }
        for (Iterator iter = listeners.iterator(); iter.hasNext();) {
            functor.execute((ProfilingResultListener) iter.next());
        }
    }

    protected void removeListener(final ProfilingResultListener listener) {
        listener.shutdown();
        listeners.remove(listener);
    }

    private void fireBatchStart() {
        batchInProgress.set(true);
        foreachListener(new ListenerFunctor() {
                public void execute(ProfilingResultListener listener) {
                    listener.onBatchStart();
                }
            });
    }

    private void fireBatchStop() {
        if (batchInProgress.compareAndSet(true, false)) {
            foreachListener(new ListenerFunctor() {
                    public void execute(ProfilingResultListener listener) {
                        listener.onBatchStop();
                    }
                });
        }
    }

    private void fireShutdown() {
        foreachListener(new ListenerFunctor() {
                public void execute(ProfilingResultListener listener) {
                    listener.shutdown();
                }
            });
    }
}

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