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 * particular file as subject to the "Classpath" exception as provided

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package net.java.html.js.tests;

import java.lang.ref.Reference;

import java.lang.ref.WeakReference;

import org.netbeans.html.json.tck.KOTest;

/**

 *

 * @author Jaroslav Tulach

 */

public class GCBodyTest {

    Reference<?> ref;

    int[] arr;

    @KOTest public void callbackInterfaceCanDisappear() throws InterruptedException {

        if (ref != null) {

            assertGC(ref, "Can disappear!");

            return;

        }

        Sum s = new Sum();

        int res = Bodies.sumIndirect(s);

        assert res == 42 : "Expecting 42";

        Reference<?> ref = new WeakReference<Object>(s);

        s = null;

        assertGC(ref, "Can disappear!");

    }

    private Object assignInst() {

        Object obj = Bodies.instance(0);

        Object s = new EmptyInstance();

        Bodies.setX(obj, s);

        assert s == Bodies.readX(obj);

        ref = new WeakReference<Object>(s);

        return obj;

}

    @KOTest public void holdObjectAndReleaseObject() throws InterruptedException {

        if (ref != null) {

            assertGC(ref, "Can disappear!");

            return;

        }

        Object obj = assignInst();

        assert ref != null;

        Bodies.setX(obj, null);

        obj = null;

        assertGC(ref, "Can disappear!");

    }

    private static Reference<?> sendRunnable(final int[] arr) {

        Runnable r = new Runnable() {

            @Override

            public void run() {

                arr[0]++;

            }

        };

        Bodies.asyncCallback(r);

        return new WeakReference<Object>(r);

    }

    private static class EmptyInstance {

    }

    @KOTest public void parametersNeedToRemainInAsyncMode() throws InterruptedException {

        if (ref != null) {

            if (arr[0] != 1) {

                throw new InterruptedException();

            }

            assertGC(ref, "Now the runnable can disappear");

            return;

        }

        arr = new int[] { 0 };

        ref = sendRunnable(arr);

        if (arr[0] == 1) {

            return;

        }

        assertNotGC(ref, false, "The runnable should not be GCed");

        throw new InterruptedException();

    }

    private static void assertGC(Reference<?> ref, String msg) throws InterruptedException {

        for (int i = 0; i < 100; i++) {

            if (isGone(ref)) return;

            long then = System.currentTimeMillis();

            int size = Bodies.gc(Math.pow(2.0, i));

            long took = System.currentTimeMillis() - then;

            if (took > 3000) {

                throw new InterruptedException(msg + " - giving up after " + took + " ms at size of " + size);

            }

            try {

                System.gc();

                System.runFinalization();

            } catch (Error err) {

                err.printStackTrace();

            }

        }

        throw new InterruptedException(msg);

    }

    private static boolean isGone(Reference<?> ref) {

        return ref.get() == null;

    }

    private static void assertNotGC(Reference<?> ref, boolean clearJS, String msg) throws InterruptedException {

        for (int i = 0; i < 10; i++) {

            if (ref.get() == null) {

                throw new IllegalStateException(msg);

            }

            if (clearJS) {

                Bodies.gc(Math.pow(2.0, i));

            }

            try {

                System.gc();

                System.runFinalization();

            } catch (Error err) {

                err.printStackTrace();

            }

        }

    }

}