2016-08-02 17:55:55 +02:00
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/*
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* Copyright 2016 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.util;
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import org.junit.Test;
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2018-11-29 08:32:32 +01:00
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import java.util.ArrayDeque;
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import java.util.Queue;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.Future;
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2019-01-22 20:14:28 +01:00
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import java.util.concurrent.ThreadLocalRandom;
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2018-11-29 08:32:32 +01:00
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import java.util.concurrent.atomic.AtomicInteger;
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2016-08-02 17:55:55 +02:00
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertTrue;
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2018-05-08 20:09:16 +02:00
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import static org.junit.Assert.fail;
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2016-08-02 17:55:55 +02:00
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public class AbstractReferenceCountedTest {
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@Test(expected = IllegalReferenceCountException.class)
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public void testRetainOverflow() {
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AbstractReferenceCounted referenceCounted = newReferenceCounted();
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referenceCounted.setRefCnt(Integer.MAX_VALUE);
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assertEquals(Integer.MAX_VALUE, referenceCounted.refCnt());
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referenceCounted.retain();
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}
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@Test(expected = IllegalReferenceCountException.class)
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public void testRetainOverflow2() {
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AbstractReferenceCounted referenceCounted = newReferenceCounted();
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assertEquals(1, referenceCounted.refCnt());
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referenceCounted.retain(Integer.MAX_VALUE);
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}
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@Test(expected = IllegalReferenceCountException.class)
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public void testReleaseOverflow() {
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AbstractReferenceCounted referenceCounted = newReferenceCounted();
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referenceCounted.setRefCnt(0);
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assertEquals(0, referenceCounted.refCnt());
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referenceCounted.release(Integer.MAX_VALUE);
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}
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2018-05-08 20:09:16 +02:00
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@Test
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public void testReleaseErrorMessage() {
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AbstractReferenceCounted referenceCounted = newReferenceCounted();
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assertTrue(referenceCounted.release());
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try {
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referenceCounted.release(1);
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fail("IllegalReferenceCountException didn't occur");
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} catch (IllegalReferenceCountException e) {
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assertEquals("refCnt: 0, decrement: 1", e.getMessage());
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}
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}
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2016-08-02 17:55:55 +02:00
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@Test(expected = IllegalReferenceCountException.class)
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public void testRetainResurrect() {
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AbstractReferenceCounted referenceCounted = newReferenceCounted();
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assertTrue(referenceCounted.release());
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assertEquals(0, referenceCounted.refCnt());
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referenceCounted.retain();
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}
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@Test(expected = IllegalReferenceCountException.class)
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public void testRetainResurrect2() {
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AbstractReferenceCounted referenceCounted = newReferenceCounted();
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assertTrue(referenceCounted.release());
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assertEquals(0, referenceCounted.refCnt());
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referenceCounted.retain(2);
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}
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2018-11-29 08:32:32 +01:00
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@Test(timeout = 30000)
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public void testRetainFromMultipleThreadsThrowsReferenceCountException() throws Exception {
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int threads = 4;
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2019-01-22 16:07:26 +01:00
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Queue<Future<?>> futures = new ArrayDeque<>(threads);
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2018-11-29 08:32:32 +01:00
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ExecutorService service = Executors.newFixedThreadPool(threads);
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final AtomicInteger refCountExceptions = new AtomicInteger();
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try {
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for (int i = 0; i < 10000; i++) {
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final AbstractReferenceCounted referenceCounted = newReferenceCounted();
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final CountDownLatch retainLatch = new CountDownLatch(1);
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assertTrue(referenceCounted.release());
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for (int a = 0; a < threads; a++) {
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final int retainCnt = ThreadLocalRandom.current().nextInt(1, Integer.MAX_VALUE);
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futures.add(service.submit(new Runnable() {
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@Override
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public void run() {
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try {
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retainLatch.await();
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try {
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referenceCounted.retain(retainCnt);
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} catch (IllegalReferenceCountException e) {
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refCountExceptions.incrementAndGet();
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}
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt();
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}
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}
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}));
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}
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retainLatch.countDown();
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for (;;) {
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Future<?> f = futures.poll();
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if (f == null) {
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break;
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}
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f.get();
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}
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assertEquals(4, refCountExceptions.get());
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refCountExceptions.set(0);
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}
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} finally {
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service.shutdown();
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}
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}
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@Test(timeout = 30000)
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public void testReleaseFromMultipleThreadsThrowsReferenceCountException() throws Exception {
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int threads = 4;
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2019-01-22 16:07:26 +01:00
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Queue<Future<?>> futures = new ArrayDeque<>(threads);
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2018-11-29 08:32:32 +01:00
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ExecutorService service = Executors.newFixedThreadPool(threads);
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final AtomicInteger refCountExceptions = new AtomicInteger();
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try {
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for (int i = 0; i < 10000; i++) {
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final AbstractReferenceCounted referenceCounted = newReferenceCounted();
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final CountDownLatch releaseLatch = new CountDownLatch(1);
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final AtomicInteger releasedCount = new AtomicInteger();
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for (int a = 0; a < threads; a++) {
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final AtomicInteger releaseCnt = new AtomicInteger(0);
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futures.add(service.submit(new Runnable() {
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@Override
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public void run() {
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try {
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releaseLatch.await();
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try {
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if (referenceCounted.release(releaseCnt.incrementAndGet())) {
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releasedCount.incrementAndGet();
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}
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} catch (IllegalReferenceCountException e) {
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refCountExceptions.incrementAndGet();
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}
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt();
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}
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}
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}));
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}
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releaseLatch.countDown();
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for (;;) {
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Future<?> f = futures.poll();
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if (f == null) {
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break;
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}
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f.get();
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}
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assertEquals(3, refCountExceptions.get());
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assertEquals(1, releasedCount.get());
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refCountExceptions.set(0);
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}
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} finally {
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service.shutdown();
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}
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}
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2016-08-02 17:55:55 +02:00
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private static AbstractReferenceCounted newReferenceCounted() {
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return new AbstractReferenceCounted() {
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@Override
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protected void deallocate() {
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// NOOP
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}
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@Override
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public ReferenceCounted touch(Object hint) {
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return this;
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}
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};
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}
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}
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