| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.hadoop.fs.impl.prefetch; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Collections; |
| import java.util.IdentityHashMap; |
| import java.util.Set; |
| |
| import org.junit.Test; |
| |
| import org.apache.hadoop.test.AbstractHadoopTestBase; |
| |
| import static org.apache.hadoop.test.LambdaTestUtils.intercept; |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertNotNull; |
| import static org.junit.Assert.assertSame; |
| import static org.junit.Assert.assertTrue; |
| |
| public class TestBoundedResourcePool extends AbstractHadoopTestBase { |
| |
| static class BufferPool extends BoundedResourcePool<ByteBuffer> { |
| |
| BufferPool(int size) { |
| super(size); |
| } |
| |
| @Override |
| protected ByteBuffer createNew() { |
| return ByteBuffer.allocate(10); |
| } |
| } |
| |
| @Test |
| public void testArgChecks() throws Exception { |
| |
| // Should not throw. |
| BufferPool pool = new BufferPool(5); |
| |
| // Verify it throws correctly. |
| |
| intercept(IllegalArgumentException.class, |
| "'size' must be a positive integer", |
| () -> new BufferPool(-1)); |
| |
| intercept(IllegalArgumentException.class, |
| "'size' must be a positive integer", |
| () -> new BufferPool(0)); |
| |
| intercept(IllegalArgumentException.class, "'item' must not be null", |
| () -> pool.release(null)); |
| |
| intercept(IllegalArgumentException.class, |
| "This item is not a part of this pool", |
| () -> pool.release(ByteBuffer.allocate(4))); |
| |
| } |
| |
| @Test |
| public void testAcquireReleaseSingle() { |
| final int numBuffers = 5; |
| BufferPool pool = new BufferPool(numBuffers); |
| |
| assertEquals(0, pool.numCreated()); |
| assertEquals(numBuffers, pool.numAvailable()); |
| |
| ByteBuffer buffer1 = pool.acquire(); |
| assertNotNull(buffer1); |
| assertEquals(1, pool.numCreated()); |
| assertEquals(numBuffers - 1, pool.numAvailable()); |
| |
| // Release and immediately reacquire => should not end up creating new buffer. |
| pool.release(buffer1); |
| assertEquals(1, pool.numCreated()); |
| |
| ByteBuffer buffer2 = pool.acquire(); |
| assertNotNull(buffer2); |
| assertSame(buffer1, buffer2); |
| assertEquals(1, pool.numCreated()); |
| } |
| |
| @Test |
| public void testAcquireReleaseMultiple() { |
| final int numBuffers = 5; |
| BufferPool pool = new BufferPool(numBuffers); |
| Set<ByteBuffer> buffers = |
| Collections.newSetFromMap(new IdentityHashMap<ByteBuffer, Boolean>()); |
| |
| assertEquals(0, pool.numCreated()); |
| |
| // Acquire all one by one. |
| for (int i = 0; i < numBuffers; i++) { |
| assertEquals(numBuffers - i, pool.numAvailable()); |
| ByteBuffer buffer = pool.acquire(); |
| assertNotNull(buffer); |
| assertFalse(buffers.contains(buffer)); |
| buffers.add(buffer); |
| assertEquals(i + 1, pool.numCreated()); |
| } |
| |
| assertEquals(numBuffers, pool.numCreated()); |
| assertEquals(0, pool.numAvailable()); |
| |
| int releaseCount = 0; |
| |
| // Release all one by one. |
| for (ByteBuffer buffer : buffers) { |
| assertEquals(releaseCount, pool.numAvailable()); |
| releaseCount++; |
| pool.release(buffer); |
| assertEquals(releaseCount, pool.numAvailable()); |
| |
| // Releasing the same buffer again should not have any ill effect. |
| pool.release(buffer); |
| assertEquals(releaseCount, pool.numAvailable()); |
| pool.release(buffer); |
| assertEquals(releaseCount, pool.numAvailable()); |
| } |
| |
| // Acquire all one by one again to ensure that they are the same ones we got earlier. |
| for (int i = 0; i < numBuffers; i++) { |
| ByteBuffer buffer = pool.acquire(); |
| assertTrue(buffers.contains(buffer)); |
| } |
| |
| assertEquals(numBuffers, pool.numCreated()); |
| assertEquals(0, pool.numAvailable()); |
| } |
| } |