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ArrayRetainableByteBufferPoolTest.java
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ArrayRetainableByteBufferPoolTest.java
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//
// ========================================================================
// Copyright (c) 1995-2021 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.io;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.hamcrest.Matchers;
import org.junit.jupiter.api.Test;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.greaterThan;
import static org.hamcrest.Matchers.lessThan;
import static org.hamcrest.Matchers.lessThanOrEqualTo;
import static org.hamcrest.Matchers.notNullValue;
import static org.hamcrest.core.Is.is;
import static org.junit.jupiter.api.Assertions.assertThrows;
public class ArrayRetainableByteBufferPoolTest
{
@Test
public void testMaxMemoryEviction()
{
ArrayRetainableByteBufferPool pool = new ArrayRetainableByteBufferPool(0, 10, 20, Integer.MAX_VALUE, 40, 40);
List<RetainableByteBuffer> buffers = new ArrayList<>();
buffers.add(pool.acquire(10, true));
assertThat(pool.getDirectMemory(), lessThanOrEqualTo(40L));
buffers.add(pool.acquire(10, true));
assertThat(pool.getDirectMemory(), lessThanOrEqualTo(40L));
buffers.add(pool.acquire(20, true));
assertThat(pool.getDirectMemory(), lessThanOrEqualTo(40L));
buffers.add(pool.acquire(20, true));
assertThat(pool.getDirectMemory(), lessThanOrEqualTo(40L));
buffers.add(pool.acquire(10, true));
assertThat(pool.getDirectMemory(), lessThanOrEqualTo(40L));
buffers.add(pool.acquire(20, true));
assertThat(pool.getDirectMemory(), lessThanOrEqualTo(40L));
buffers.add(pool.acquire(10, true));
assertThat(pool.getDirectMemory(), lessThanOrEqualTo(40L));
buffers.add(pool.acquire(20, true));
assertThat(pool.getDirectMemory(), lessThanOrEqualTo(40L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(0L));
assertThat(pool.getDirectByteBufferCount(), greaterThan(0L));
assertThat(pool.getDirectMemory(), greaterThan(0L));
buffers.forEach(RetainableByteBuffer::release);
assertThat(pool.getAvailableDirectByteBufferCount(), greaterThan(0L));
assertThat(pool.getAvailableDirectByteBufferCount(), lessThan((long)buffers.size()));
assertThat(pool.getDirectByteBufferCount(), greaterThan(0L));
assertThat(pool.getDirectByteBufferCount(), lessThan((long)buffers.size()));
assertThat(pool.getDirectMemory(), lessThanOrEqualTo(40L));
assertThat(pool.getDirectMemory(), greaterThan(0L));
}
@Test
public void testBelowMinCapacityDoesNotPool()
{
ArrayRetainableByteBufferPool pool = new ArrayRetainableByteBufferPool(10, 10, 20, Integer.MAX_VALUE);
RetainableByteBuffer buf1 = pool.acquire(1, true);
assertThat(buf1.capacity(), is(1));
assertThat(pool.getDirectByteBufferCount(), is(0L));
assertThat(pool.getDirectMemory(), is(0L));
buf1.release();
assertThat(pool.getDirectByteBufferCount(), is(0L));
assertThat(pool.getDirectMemory(), is(0L));
}
@Test
public void testOverMaxCapacityDoesNotPool()
{
ArrayRetainableByteBufferPool pool = new ArrayRetainableByteBufferPool(10, 10, 20, Integer.MAX_VALUE);
RetainableByteBuffer buf1 = pool.acquire(21, true);
assertThat(buf1.capacity(), is(21));
assertThat(pool.getDirectByteBufferCount(), is(0L));
assertThat(pool.getDirectMemory(), is(0L));
buf1.release();
assertThat(pool.getDirectByteBufferCount(), is(0L));
assertThat(pool.getDirectMemory(), is(0L));
}
@Test
public void testRetain()
{
ArrayRetainableByteBufferPool pool = new ArrayRetainableByteBufferPool(10, 10, 20, Integer.MAX_VALUE);
RetainableByteBuffer buf1 = pool.acquire(10, true);
assertThat(pool.getDirectMemory(), is(10L));
assertThat(pool.getAvailableDirectMemory(), is(0L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(0L));
assertThat(pool.getDirectByteBufferCount(), is(1L));
assertThat(buf1.isRetained(), is(false));
buf1.retain();
buf1.retain();
assertThat(buf1.isRetained(), is(true));
assertThat(buf1.release(), is(false));
assertThat(buf1.isRetained(), is(true));
assertThat(buf1.release(), is(false));
assertThat(buf1.isRetained(), is(false));
assertThat(pool.getDirectMemory(), is(10L));
assertThat(pool.getAvailableDirectMemory(), is(0L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(0L));
assertThat(pool.getDirectByteBufferCount(), is(1L));
assertThat(buf1.release(), is(true));
assertThat(buf1.isRetained(), is(false));
assertThat(pool.getDirectMemory(), is(10L));
assertThat(pool.getAvailableDirectMemory(), is(10L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(1L));
assertThat(pool.getDirectByteBufferCount(), is(1L));
}
@Test
public void testTooManyReleases()
{
ArrayRetainableByteBufferPool pool = new ArrayRetainableByteBufferPool(10, 10, 20, Integer.MAX_VALUE);
RetainableByteBuffer buf1 = pool.acquire(10, true);
assertThat(pool.getDirectMemory(), is(10L));
assertThat(pool.getAvailableDirectMemory(), is(0L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(0L));
assertThat(pool.getDirectByteBufferCount(), is(1L));
buf1.release();
assertThat(pool.getDirectMemory(), is(10L));
assertThat(pool.getAvailableDirectMemory(), is(10L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(1L));
assertThat(pool.getDirectByteBufferCount(), is(1L));
assertThrows(IllegalStateException.class, buf1::release);
assertThat(pool.getDirectMemory(), is(10L));
assertThat(pool.getAvailableDirectMemory(), is(10L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(1L));
assertThat(pool.getDirectByteBufferCount(), is(1L));
}
@Test
public void testMaxBucketSize()
{
ArrayRetainableByteBufferPool pool = new ArrayRetainableByteBufferPool(0, 10, 20, 2);
RetainableByteBuffer buf1 = pool.acquire(1, true); // pooled
assertThat(buf1.capacity(), is(10));
RetainableByteBuffer buf2 = pool.acquire(1, true); // pooled
assertThat(buf2.capacity(), is(10));
RetainableByteBuffer buf3 = pool.acquire(1, true); // not pooled, bucket is full
assertThat(buf3.capacity(), is(1));
assertThat(pool.getDirectByteBufferCount(), is(2L));
assertThat(pool.getDirectMemory(), is(20L));
RetainableByteBuffer buf4 = pool.acquire(11, true); // pooled
assertThat(buf4.capacity(), is(20));
RetainableByteBuffer buf5 = pool.acquire(11, true); // pooled
assertThat(buf5.capacity(), is(20));
RetainableByteBuffer buf6 = pool.acquire(11, true); // not pooled, bucket is full
assertThat(buf6.capacity(), is(11));
assertThat(pool.getDirectByteBufferCount(), is(4L));
assertThat(pool.getDirectMemory(), is(60L));
}
@Test
public void testBufferReleaseRepools()
{
ArrayRetainableByteBufferPool pool = new ArrayRetainableByteBufferPool(0, 10, 20, 1);
List<RetainableByteBuffer> all = new ArrayList<>();
all.add(pool.acquire(1, true)); // pooled
all.add(pool.acquire(1, true)); // not pooled, bucket is full
all.add(pool.acquire(11, true)); // pooled
all.add(pool.acquire(11, true)); // not pooled, bucket is full
assertThat(pool.getDirectByteBufferCount(), is(2L));
assertThat(pool.getDirectMemory(), is(30L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(0L));
assertThat(pool.getAvailableDirectMemory(), is(0L));
all.forEach(RetainableByteBuffer::release);
assertThat(pool.getDirectByteBufferCount(), is(2L));
assertThat(pool.getDirectMemory(), is(30L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(2L));
assertThat(pool.getAvailableDirectMemory(), is(30L));
}
@Test
public void testFactorAndCapacity()
{
ArrayRetainableByteBufferPool pool = new ArrayRetainableByteBufferPool(10, 10, 20, Integer.MAX_VALUE);
pool.acquire(1, true); // not pooled, < minCapacity
pool.acquire(10, true); // pooled
pool.acquire(20, true); // pooled
pool.acquire(30, true); // not pooled, > maxCapacity
assertThat(pool.getDirectByteBufferCount(), is(2L));
assertThat(pool.getDirectMemory(), is(30L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(0L));
assertThat(pool.getAvailableDirectMemory(), is(0L));
}
@Test
public void testClearUnlinksLeakedBuffers()
{
ArrayRetainableByteBufferPool pool = new ArrayRetainableByteBufferPool();
pool.acquire(10, true);
pool.acquire(10, true);
assertThat(pool.getDirectByteBufferCount(), is(2L));
assertThat(pool.getDirectMemory(), is(2048L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(0L));
assertThat(pool.getAvailableDirectMemory(), is(0L));
pool.clear();
assertThat(pool.getDirectByteBufferCount(), is(0L));
assertThat(pool.getDirectMemory(), is(0L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(0L));
assertThat(pool.getAvailableDirectMemory(), is(0L));
}
@Test
public void testRetainAfterRePooledThrows()
{
ArrayRetainableByteBufferPool pool = new ArrayRetainableByteBufferPool();
RetainableByteBuffer buf1 = pool.acquire(10, true);
assertThat(pool.getDirectByteBufferCount(), is(1L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(0L));
assertThat(buf1.release(), is(true));
assertThrows(IllegalStateException.class, buf1::retain);
assertThrows(IllegalStateException.class, buf1::release);
assertThat(pool.getDirectByteBufferCount(), is(1L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(1L));
// check that the buffer is still available
RetainableByteBuffer buf2 = pool.acquire(10, true);
assertThat(pool.getDirectByteBufferCount(), is(1L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(0L));
assertThat(buf2 == buf1, is(true)); // make sure it's not a new instance
assertThat(buf1.release(), is(true));
assertThat(pool.getDirectByteBufferCount(), is(1L));
assertThat(pool.getAvailableDirectByteBufferCount(), is(1L));
}
@Test
public void testAcquireRelease()
{
ArrayRetainableByteBufferPool pool = new ArrayRetainableByteBufferPool();
for (int i = 0; i < 3; i++)
{
RetainableByteBuffer buf1 = pool.acquire(10, true);
assertThat(buf1, is(notNullValue()));
assertThat(buf1.capacity(), is(1024));
RetainableByteBuffer buf2 = pool.acquire(10, true);
assertThat(buf2, is(notNullValue()));
assertThat(buf2.capacity(), is(1024));
buf1.release();
buf2.release();
RetainableByteBuffer buf3 = pool.acquire(16384 + 1, true);
assertThat(buf3, is(notNullValue()));
assertThat(buf3.capacity(), is(16384 + 1024));
buf3.release();
RetainableByteBuffer buf4 = pool.acquire(32768, true);
assertThat(buf4, is(notNullValue()));
assertThat(buf4.capacity(), is(32768));
buf4.release();
RetainableByteBuffer buf5 = pool.acquire(32768, false);
assertThat(buf5, is(notNullValue()));
assertThat(buf5.capacity(), is(32768));
buf5.release();
}
assertThat(pool.getDirectByteBufferCount(), is(4L));
assertThat(pool.getHeapByteBufferCount(), is(1L));
assertThat(pool.getDirectMemory(), is(1024 + 1024 + 16384 + 1024 + 32768L));
assertThat(pool.getHeapMemory(), is(32768L));
pool.clear();
assertThat(pool.getDirectByteBufferCount(), is(0L));
assertThat(pool.getHeapByteBufferCount(), is(0L));
assertThat(pool.getDirectMemory(), is(0L));
assertThat(pool.getHeapMemory(), is(0L));
}
@Test
public void testLogBuckets() throws IOException
{
RetainableByteBufferPool.SampledPool pool = new RetainableByteBufferPool.SampledPool(new ArrayRetainableByteBufferPool.LogBuckets());
assertThat(pool.acquire(1, false).capacity(), is(1));
assertThat(pool.acquire(2, false).capacity(), is(2));
assertThat(pool.acquire(3, false).capacity(), is(4));
assertThat(pool.acquire(4, false).capacity(), is(4));
int capacity = 4;
while (true)
{
RetainableByteBuffer b = pool.acquire(capacity - 1, false);
assertThat(b.capacity(), Matchers.is(capacity));
b = pool.acquire(capacity, false);
assertThat(b.capacity(), Matchers.is(capacity));
if (capacity >= ((ArrayRetainableByteBufferPool)pool.getPool()).getMaxCapacity())
break;
b = pool.acquire(capacity + 1, false);
assertThat(b.capacity(), Matchers.is(capacity * 2));
capacity = capacity * 2;
}
System.err.println(pool.dump());
}
}