/*
 *    Geotoolkit - An Open Source Java GIS Toolkit
 *    http://www.geotoolkit.org
 *
 *    (C) 2010, Geomatys
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation; either
 *    version 2.1 of the License, or (at your option) any later version.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 */
package org.geotoolkit.style;

import org.geotoolkit.util.collection.CollectionChangeEvent;
import java.beans.PropertyChangeEvent;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;

import org.junit.Test;
import static org.junit.Assert.*;
import org.opengis.style.SemanticType;
import org.opengis.style.Symbolizer;
import org.opengis.util.GenericName;
import org.apache.sis.util.logging.Logging;

/**
 *
 * @author Johann Sorel (Geomatys)
 * @module
 */
public class WeakListenerTest extends org.geotoolkit.test.TestBase {

    private static final MutableStyleFactory SF = new DefaultStyleFactory();

    public WeakListenerTest() {
    }

    /**
     * Test no memory leak in weak style listener
     */
    @Test
    public void testWeakStyleListener() {
        final AtomicInteger count = new AtomicInteger(0);

        final MutableStyle style = SF.style();
        StyleListener listener = new StyleListener() {
            @Override
            public void featureTypeStyleChange(CollectionChangeEvent<MutableFeatureTypeStyle> event) {
                count.incrementAndGet();
            }
            @Override
            public void propertyChange(PropertyChangeEvent evt) {
                fail("Should never had been called");
            }

        };

        StyleListener.Weak weak = new StyleListener.Weak(listener);
        weak.registerSource(style);

        style.featureTypeStyles().add(SF.featureTypeStyle());
        assertEquals(1, count.get());
        listener = null;
        pause();

        style.featureTypeStyles().add(SF.featureTypeStyle());
        //listener should have desapear now, so the event should not have been send
        assertEquals(1, count.get());
    }

    /**
     * Test no memory leak in weak fts listener
     */
    @Test
    public void testWeakFTSListener() {
        final AtomicInteger count = new AtomicInteger(0);

        final MutableFeatureTypeStyle fts = SF.featureTypeStyle();
        FeatureTypeStyleListener listener = new FeatureTypeStyleListener() {
            @Override
            public void ruleChange(CollectionChangeEvent<MutableRule> event) {
                count.incrementAndGet();
            }
            @Override
            public void propertyChange(PropertyChangeEvent evt) {
                fail("Should never had been called");
            }
            @Override
            public void featureTypeNameChange(CollectionChangeEvent<GenericName> event) {
                fail("Should never had been called");
            }
            @Override
            public void semanticTypeChange(CollectionChangeEvent<SemanticType> event) {
                fail("Should never had been called");
            }

        };

        FeatureTypeStyleListener.Weak weak = new FeatureTypeStyleListener.Weak(listener);
        weak.registerSource(fts);

        fts.rules().add(SF.rule());
        assertEquals(1, count.get());
        listener = null;
        pause();

        fts.rules().add(SF.rule());
        //listener should have desapear now, so the event should not have been send
        assertEquals(1, count.get());
    }

    /**
     * Test no memory leak in weak rule listener
     */
    @Test
    public void testWeakRuleListener() {
        final AtomicInteger count = new AtomicInteger(0);

        final MutableRule rule = SF.rule();
        RuleListener listener = new RuleListener() {
            @Override
            public void symbolizerChange(CollectionChangeEvent<Symbolizer> event) {
                count.incrementAndGet();
            }
            @Override
            public void propertyChange(PropertyChangeEvent evt) {
                fail("Should never had been called");
            }
        };

        RuleListener.Weak weak = new RuleListener.Weak(listener);
        weak.registerSource(rule);

        rule.symbolizers().add(SF.lineSymbolizer());
        assertEquals(1, count.get());
        listener = null;
        pause();

        rule.symbolizers().add(SF.pointSymbolizer());
        //listener should have desapear now, so the event should not have been send
        assertEquals(1, count.get());
    }

    private static void pause(){
        for(int i=0;i<4;i++){
            System.gc();
            System.gc();
            System.gc();
            System.gc();
            try {
                Thread.sleep(200);
            } catch (InterruptedException ex) {
                Logging.getLogger("org.geotoolkit.style").log(Level.SEVERE, null, ex);
            }
        }
    }

}