weak001.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @key stress randomness
 *
 * @summary converted from VM Testbase gc/gctests/WeakReference/weak001.
 * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent]
 * VM Testbase readme:
 * DESCRIPTION
 *     The test checks that Garbage Collector correctly works with
 *     WeakReferences. It also checks that no unexpected exceptions and errors
 *     are thrown or the JVM is not crashed.
 *     The test starts a number of threads. Each thread run tests for some time
 *     or serveral iterations.  See javadoc StressOptions for configuration.
 *     First of all each test defines what type to check (there are 10 types
 *     totally). As soon as the type is defined, a WeakReference is created that
 *     refers to an array of tested type and is registered with in a queue. A
 *     WeakReference for NonbranchyTree class does not refer to an array, but to
 *     instances of the class.
 *     After that a thread performs next checks for the reference:
 *         1. The reference is in queue after GC is provoked with
 *            Algorithms.eatMemory() method (a single thread eats the memory).
 *         2. queue.remove() returns reference from the queue.
 *         3. queue.poll() returns null.
 *         4. reference.clear() does not throw any exception.
 *     The test extends ThreadedGCTest and implements GarbageProducerAware and
 *     MemoryStrategyAware interfaces. The corresponding javadoc documentation
 *     for additional test configuration.
 *
 * @library /vmTestbase
 *          /test/lib
 * @run main/othervm gc.gctests.WeakReference.weak001.weak001 -ms low
 */

package gc.gctests.WeakReference.weak001;

import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;

import nsk.share.gc.GC;
import nsk.share.gc.NonbranchyTree;
import nsk.share.gc.ThreadedGCTest;
import nsk.share.gc.gp.GarbageProducer;
import nsk.share.gc.gp.GarbageProducerAware;
import nsk.share.gc.gp.GarbageUtils;
import nsk.share.gc.gp.MemoryStrategy;
import nsk.share.gc.gp.MemoryStrategyAware;
import nsk.share.gc.gp.string.InternedStringProducer;
import nsk.share.gc.gp.string.RandomStringProducer;

public class weak001 extends ThreadedGCTest implements GarbageProducerAware, MemoryStrategyAware {

    private GarbageProducer garbageProducer;
    private MemoryStrategy memoryStrategy;
    private InternedStringProducer internedStringProducer = new InternedStringProducer(new RandomStringProducer(10));
    // Total number of types to test
    final static int TYPES_COUNT = 11;
    // Size of array of each tested type. The constant also specifies the
    // number of nodes in a NonbranchyTree and size of each node
    final static int SIZE = 100;

    protected Runnable createRunnable(int i) {
        return new Test();
    }

    public void setGarbageProducer(GarbageProducer garbageProducer) {
        this.garbageProducer = garbageProducer;
    }

    public void setMemoryStrategy(MemoryStrategy memoryStrategy) {
        this.memoryStrategy = memoryStrategy;
    }

    public static void main(String[] args) {
        GC.runTest(new weak001(), args);
    }

    // The class implements the logic of the testcase
    class Test implements Runnable {

        int iteration;

        public void run() {
            // Pre-allocated OOME message to avoid OOME when logging it
            String oomMsg = "Ignored OOME in run()";
            try {

                log.info("iteration " + iteration);
                ReferenceQueue queue = new ReferenceQueue();
                WeakReference reference;
                int code = iteration % TYPES_COUNT;
                String type;
                // Define a specific type for each thread to test
                switch (code) {
                    case 0:
                        reference = new WeakReference(new byte[SIZE], queue);
                        type = "byte";
                        break;
                    case 1:
                        reference = new WeakReference(new short[SIZE], queue);
                        type = "short";
                        break;
                    case 2:
                        reference = new WeakReference(new int[SIZE], queue);
                        type = "int";
                        break;
                    case 3:
                        reference = new WeakReference(new long[SIZE], queue);
                        type = "long";
                        break;
                    case 4:
                        reference = new WeakReference(new char[SIZE], queue);
                        type = "char";
                        break;
                    case 5:
                        reference = new WeakReference(new boolean[SIZE], queue);
                        type = "boolean";
                        break;
                    case 6:
                        reference = new WeakReference(new double[SIZE], queue);
                        type = "double";
                        break;
                    case 7:
                        reference = new WeakReference(new float[SIZE], queue);
                        type = "float";
                        break;
                    case 8:
                        reference = new WeakReference(new Object[SIZE], queue);
                        type = "Object";
                        break;
                    case 9:
                        reference = new WeakReference(internedStringProducer.create(SIZE), queue);
                        type = "InternedString";
                        break;
                    default:
                        reference = new WeakReference(new NonbranchyTree(SIZE, 0.3f, SIZE),
                                queue);
                        type = "NonbranchyTree";
                        break;
                }
                int initialFactor = memoryStrategy.equals(MemoryStrategy.HIGH) ? 1 : (memoryStrategy.equals(MemoryStrategy.LOW) ? 10 : 2);
                GarbageUtils.eatMemory(getExecutionController(), garbageProducer, initialFactor , 10, 0);
                if (!getExecutionController().continueExecution()) {
                    // we were interrrupted by stresser. just exit...
                    return;
                }
                Reference polledReference = null;
                try {
                    polledReference = queue.remove();
                } catch (InterruptedException e) {
                    log.error("Unexpected InterruptedException during queue.remove().");
                    setFailed(true);
                }
                // Check the reference and the queue
                // The polled reference must be equal to the one enqueued to
                // the queue

                if (polledReference != reference) {
                    log.error("The original reference is not equal to polled reference.");
                    setFailed(true);
                }

                // queue.poll() once again must return null now, since there is
                // only one reference in the queue
                polledReference = queue.poll();
                if (polledReference != null) {
                    log.error("There are more  than one references in the queue.");
                    setFailed(true);
                }
                reference.clear();
            } catch (OutOfMemoryError e) {
                log.info(oomMsg);
            }
            iteration++;
        }
    }
}