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package org.graalvm.visualvm.lib.profiler.snaptracer.impl;

import org.graalvm.visualvm.lib.profiler.snaptracer.TracerPackage;
import org.graalvm.visualvm.lib.profiler.snaptracer.TracerPackageProvider;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.graalvm.visualvm.lib.profiler.snaptracer.Positionable;
import org.graalvm.visualvm.lib.profiler.snaptracer.impl.packages.TestPackageProvider;
import org.openide.util.RequestProcessor;

/**
 *
 * @author Jiri Sedlacek
 */
public final class TracerSupportImpl {

    private static TracerSupportImpl INSTANCE;
    private static RequestProcessor PROCESSOR;

    private final Set<TracerPackageProvider> providers;


    public static synchronized TracerSupportImpl getInstance() {
        if (INSTANCE == null) {
            INSTANCE = new TracerSupportImpl();
            PROCESSOR = new RequestProcessor("Tracer Processor", 5); // NOI18N
        }
        return INSTANCE;
    }


    public synchronized void registerPackageProvider(TracerPackageProvider provider) {
        providers.add(provider);
    }

    public synchronized void unregisterPackageProvider(TracerPackageProvider provider) {
        providers.remove(provider);
    }


    public synchronized boolean hasPackages(Object target) {
        for (TracerPackageProvider provider : providers)
            if (provider.getScope().isInstance(target))
                return true;
        return false;
    }

    public synchronized List<TracerPackage> getPackages(IdeSnapshot snapshot) {
        List<TracerPackage> packages = new ArrayList();
        for (TracerPackageProvider provider : providers)
            packages.addAll(Arrays.asList(provider.getPackages(snapshot)));
        Collections.sort(packages, Positionable.COMPARATOR);
        return packages;
    }
    
    
    public void perform(Runnable task) {
        PROCESSOR.post(task);
    }


    private TracerSupportImpl() {
        providers = new HashSet();
        registerPackageProvider(new TestPackageProvider());
    }

}
