Merge "Remove CoreTests: HeapTest" am: c3fd3b8c am: 19d39ee3 am: 1cfc324d am: 2d828366

/*

 * Copyright (C) 2007 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package android.core;

import android.test.suitebuilder.annotation.LargeTest;

import android.test.suitebuilder.annotation.MediumTest;

import android.test.suitebuilder.annotation.SmallTest;

import android.util.Log;

import android.test.suitebuilder.annotation.Suppress;

import dalvik.system.VMRuntime;

import junit.framework.TestCase;

import java.lang.ref.PhantomReference;

import java.lang.ref.ReferenceQueue;

import java.lang.ref.SoftReference;

import java.lang.ref.WeakReference;

import java.util.LinkedList;

import java.util.Random;

public class HeapTest extends TestCase {

    private static final String TAG = "HeapTest";

    /**

     * Returns a WeakReference to an object that has no

     * other references.  This is done in a separate method

     * to ensure that the Object's address isn't sitting in

     * a stale local register.

     */

    private WeakReference<Object> newRef() {

        return new WeakReference<Object>(new Object());

    }

    private static void makeRefs(Object objects[], SoftReference<Object> refs[]) {

        for (int i = 0; i < objects.length; i++) {

            objects[i] = (Object) new byte[8 * 1024];

            refs[i] = new SoftReference<Object>(objects[i]);

        }

    }

    private static <T> int checkRefs(SoftReference<T> refs[], int last) {

        int i;

        int numCleared = 0;

        for (i = 0; i < refs.length; i++) {

            Object o = refs[i].get();

            if (o == null) {

                numCleared++;

            }

        }

        if (numCleared != last) {

            Log.i(TAG, "****** " + numCleared + "/" + i + " cleared ******");

        }

        return numCleared;

    }

    private static void clearRefs(Object objects[], int skip) {

        for (int i = 0; i < objects.length; i += skip) {

            objects[i] = null;

        }

    }

    private static void clearRefs(Object objects[]) {

        clearRefs(objects, 1);

    }

    private static <T> void checkRefs(T objects[], SoftReference<T> refs[]) {

        boolean ok = true;

        for (int i = 0; i < objects.length; i++) {

            if (refs[i].get() != objects[i]) {

                ok = false;

            }

        }

        if (!ok) {

            throw new RuntimeException("Test failed: soft refs not cleared");

        }

    }

    @MediumTest

    public void testGcSoftRefs() throws Exception {

        final int NUM_REFS = 128;

        Object objects[] = new Object[NUM_REFS];

        SoftReference<Object> refs[] = new SoftReference[objects.length];

        /* Create a bunch of objects and a parallel array

         * of SoftReferences.

         */

        makeRefs(objects, refs);

        Runtime.getRuntime().gc();

        /* Let go of some of the hard references to the objects so that

         * the references can be cleared.

         */

        clearRefs(objects, 3);

        /* Collect all softly-reachable objects.

         */

        VMRuntime.getRuntime().gcSoftReferences();

        Runtime.getRuntime().runFinalization();

        /* Make sure that the objects were collected.

         */

        checkRefs(objects, refs);

        /* Remove more hard references and re-check.

         */

        clearRefs(objects, 2);

        VMRuntime.getRuntime().gcSoftReferences();

        Runtime.getRuntime().runFinalization();

        checkRefs(objects, refs);

        /* Remove the rest of the references and re-check.

         */

        /* Remove more hard references and re-check.

         */

        clearRefs(objects);

        VMRuntime.getRuntime().gcSoftReferences();

        Runtime.getRuntime().runFinalization();

        checkRefs(objects, refs);

    }

    public void xxtestSoftRefPartialClean() throws Exception {

        final int NUM_REFS = 128;

        Object objects[] = new Object[NUM_REFS];

        SoftReference<Object> refs[] = new SoftReference[objects.length];

        /* Create a bunch of objects and a parallel array

        * of SoftReferences.

        */

        makeRefs(objects, refs);

        Runtime.getRuntime().gc();

        /* Let go of the hard references to the objects so that

        * the references can be cleared.

        */

        clearRefs(objects);

        /* Start creating a bunch of temporary and permanent objects

        * to drive GC.

        */

        final int NUM_OBJECTS = 64 * 1024;

        Object junk[] = new Object[NUM_OBJECTS];

        Random random = new Random();

        int i = 0;

        int mod = 0;

        int totalSize = 0;

        int cleared = -1;

        while (i < junk.length && totalSize < 8 * 1024 * 1024) {

            int r = random.nextInt(64 * 1024) + 128;

            Object o = (Object) new byte[r];

            if (++mod % 16 == 0) {

                junk[i++] = o;

                totalSize += r * 4;

            }

            cleared = checkRefs(refs, cleared);

        }

    }

    private static void makeRefs(Object objects[], WeakReference<Object> refs[]) {

        for (int i = 0; i < objects.length; i++) {

            objects[i] = new Object();

            refs[i] = new WeakReference<Object>(objects[i]);

        }

    }

    private static <T> void checkRefs(T objects[], WeakReference<T> refs[]) {

        boolean ok = true;

        for (int i = 0; i < objects.length; i++) {

            if (refs[i].get() != objects[i]) {

                ok = false;

            }

        }

        if (!ok) {

            throw new RuntimeException("Test failed: " +

                    "weak refs not cleared");

        }

    }

    @MediumTest

    public void testWeakRefs() throws Exception {

        final int NUM_REFS = 16;

        Object objects[] = new Object[NUM_REFS];

        WeakReference<Object> refs[] = new WeakReference[objects.length];

        /* Create a bunch of objects and a parallel array

        * of WeakReferences.

        */

        makeRefs(objects, refs);

        Runtime.getRuntime().gc();

        checkRefs(objects, refs);

        /* Clear out every other strong reference.

        */

        for (int i = 0; i < objects.length; i += 2) {

            objects[i] = null;

        }

        Runtime.getRuntime().gc();

        checkRefs(objects, refs);

        /* Clear out the rest of them.

        */

        for (int i = 0; i < objects.length; i++) {

            objects[i] = null;

        }

        Runtime.getRuntime().gc();

        checkRefs(objects, refs);

    }

    private static void makeRefs(Object objects[], PhantomReference<Object> refs[],

            ReferenceQueue<Object> queue) {

        for (int i = 0; i < objects.length; i++) {

            objects[i] = new Object();

            refs[i] = new PhantomReference<Object>(objects[i], queue);

        }

    }

    static <T> void checkRefs(T objects[], PhantomReference<T> refs[],

            ReferenceQueue<T> queue) {

        boolean ok = true;

        /* Make sure that the reference that should be on

        * the queue are marked as enqueued.  Once we

        * pull them off the queue, they will no longer

        * be marked as enqueued.

        */

        for (int i = 0; i < objects.length; i++) {

            if (objects[i] == null && refs[i] != null) {

                if (!refs[i].isEnqueued()) {

                    ok = false;

                }

            }

        }

        if (!ok) {

            throw new RuntimeException("Test failed: " +

                    "phantom refs not marked as enqueued");

        }

        /* Make sure that all of the references on the queue

        * are supposed to be there.

        */

        PhantomReference<T> ref;

        while ((ref = (PhantomReference<T>) queue.poll()) != null) {

            /* Find the list index that corresponds to this reference.

            */

            int i;

            for (i = 0; i < objects.length; i++) {

                if (refs[i] == ref) {

                    break;

                }

            }

            if (i == objects.length) {

                throw new RuntimeException("Test failed: " +

                        "unexpected ref on queue");

            }

            if (objects[i] != null) {

                throw new RuntimeException("Test failed: " +

                        "reference enqueued for strongly-reachable " +

                        "object");

            }

            refs[i] = null;

            /* TODO: clear doesn't do much, since we're losing the

            * strong ref to the ref object anyway.  move the ref

            * into another list.

            */

            ref.clear();

        }

        /* We've visited all of the enqueued references.

        * Make sure that there aren't any other references

        * that should have been enqueued.

        *

        * NOTE: there is a race condition here;  this assumes

        * that the VM has serviced all outstanding reference

        * enqueue() calls.

        */

        for (int i = 0; i < objects.length; i++) {

            if (objects[i] == null && refs[i] != null) {

//                System.out.println("HeapTest/PhantomRefs: refs[" + i +

//                        "] should be enqueued");

                ok = false;

            }

        }

        if (!ok) {

            throw new RuntimeException("Test failed: " +

                    "phantom refs not enqueued");

        }

    }

    @MediumTest

    public void testPhantomRefs() throws Exception {

        final int NUM_REFS = 16;

        Object objects[] = new Object[NUM_REFS];

        PhantomReference<Object> refs[] = new PhantomReference[objects.length];

        ReferenceQueue<Object> queue = new ReferenceQueue<Object>();

        /* Create a bunch of objects and a parallel array

        * of PhantomReferences.

        */

        makeRefs(objects, refs, queue);

        Runtime.getRuntime().gc();

        checkRefs(objects, refs, queue);

        /* Clear out every other strong reference.

        */

        for (int i = 0; i < objects.length; i += 2) {

            objects[i] = null;

        }

        // System.out.println("HeapTest/PhantomRefs: cleared evens");

        Runtime.getRuntime().gc();

        Runtime.getRuntime().runFinalization();

        checkRefs(objects, refs, queue);

        /* Clear out the rest of them.

        */

        for (int i = 0; i < objects.length; i++) {

            objects[i] = null;

        }

        // System.out.println("HeapTest/PhantomRefs: cleared all");

        Runtime.getRuntime().gc();

        Runtime.getRuntime().runFinalization();

        checkRefs(objects, refs, queue);

    }

    private static int sNumFinalized = 0;

    private static final Object sLock = new Object();

    private static class FinalizableObject {

        protected void finalize() {

            // System.out.println("gc from finalize()");

            Runtime.getRuntime().gc();

            synchronized (sLock) {

                sNumFinalized++;

            }

        }

    }

    private static void makeRefs(FinalizableObject objects[],

            WeakReference<FinalizableObject> refs[]) {

        for (int i = 0; i < objects.length; i++) {

            objects[i] = new FinalizableObject();

            refs[i] = new WeakReference<FinalizableObject>(objects[i]);

        }

    }

    @LargeTest

    public void testWeakRefsAndFinalizers() throws Exception {

        final int NUM_REFS = 16;

        FinalizableObject objects[] = new FinalizableObject[NUM_REFS];

        WeakReference<FinalizableObject> refs[] = new WeakReference[objects.length];

        int numCleared;

        /* Create a bunch of objects and a parallel array

        * of WeakReferences.

        */

        makeRefs(objects, refs);

        Runtime.getRuntime().gc();

        checkRefs(objects, refs);

        /* Clear out every other strong reference.

        */

        sNumFinalized = 0;

        numCleared = 0;

        for (int i = 0; i < objects.length; i += 2) {

            objects[i] = null;

            numCleared++;

        }

        // System.out.println("HeapTest/WeakRefsAndFinalizers: cleared evens");

        Runtime.getRuntime().gc();

        Runtime.getRuntime().runFinalization();

        checkRefs(objects, refs);

        if (sNumFinalized != numCleared) {

            throw new RuntimeException("Test failed: " +

                    "expected " + numCleared + " finalizations, saw " +

                    sNumFinalized);

        }

        /* Clear out the rest of them.

        */

        sNumFinalized = 0;

        numCleared = 0;

        for (int i = 0; i < objects.length; i++) {

            if (objects[i] != null) {

                objects[i] = null;

                numCleared++;

            }

        }

        // System.out.println("HeapTest/WeakRefsAndFinalizers: cleared all");

        Runtime.getRuntime().gc();

        Runtime.getRuntime().runFinalization();

        checkRefs(objects, refs);

        if (sNumFinalized != numCleared) {

            throw new RuntimeException("Test failed: " +

                    "expected " + numCleared + " finalizations, saw " +

                    sNumFinalized);

        }

    }

    // TODO: flaky test

    //@MediumTest

    public void testOomeLarge() throws Exception {

        /* Just shy of the typical max heap size so that it will actually

         * try to allocate it instead of short-circuiting.

         */

        final int SIXTEEN_MB = (16 * 1024 * 1024 - 32);

        Boolean sawEx = false;

        byte a[];

        try {

            a = new byte[SIXTEEN_MB];

        } catch (OutOfMemoryError oom) {

            //Log.i(TAG, "HeapTest/OomeLarge caught " + oom);

            sawEx = true;

        }

        if (!sawEx) {

            throw new RuntimeException("Test failed: " +

                    "OutOfMemoryError not thrown");

        }

    }

    //See bug 1308253 for reasons.

    @Suppress

    public void disableTestOomeSmall() throws Exception {

        final int SIXTEEN_MB = (16 * 1024 * 1024);

        final int LINK_SIZE = 6 * 4; // estimated size of a LinkedList's node

        Boolean sawEx = false;

        LinkedList<Object> list = new LinkedList<Object>();

        /* Allocate progressively smaller objects to fill up the entire heap.

         */

        int objSize = 1 * 1024 * 1024;

        while (objSize >= LINK_SIZE) {

            try {

                for (int i = 0; i < SIXTEEN_MB / objSize; i++) {

                    list.add((Object)new byte[objSize]);

                }

            } catch (OutOfMemoryError oom) {

                sawEx = true;

            }

            if (!sawEx) {

                throw new RuntimeException("Test failed: " +

                        "OutOfMemoryError not thrown while filling heap");

            }

            sawEx = false;

            objSize = (objSize * 4) / 5;

        }

    }

}