| /* |
| * 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.cassandra.hints; |
| |
| import org.apache.cassandra.Util; |
| import org.jboss.byteman.contrib.bmunit.BMRule; |
| import org.jboss.byteman.contrib.bmunit.BMUnitRunner; |
| import org.junit.BeforeClass; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| |
| import com.google.common.collect.ImmutableList; |
| |
| import static junit.framework.Assert.*; |
| |
| import java.lang.Thread.State; |
| import java.util.Queue; |
| import java.util.UUID; |
| import java.util.concurrent.ConcurrentLinkedQueue; |
| |
| @RunWith(BMUnitRunner.class) |
| public class HintsBufferPoolTest |
| { |
| |
| @BeforeClass |
| public static void defineSchema() |
| { |
| HintsBufferTest.defineSchema(); |
| } |
| |
| /* |
| * Check that the hints buffer pool will only drain a limited number of buffers |
| */ |
| static volatile boolean blockedOnBackpressure = false; |
| @Test |
| @BMRule(name = "Greatest name in the world", |
| targetClass="HintsBufferPool", |
| targetMethod="switchCurrentBuffer", |
| targetLocation="AT INVOKE java.util.concurrent.BlockingQueue.take", |
| action="org.apache.cassandra.hints.HintsBufferPoolTest.blockedOnBackpressure = true;") |
| public void testBackpressure() throws Exception |
| { |
| Queue<HintsBuffer> returnedBuffers = new ConcurrentLinkedQueue<>(); |
| HintsBufferPool pool = new HintsBufferPool(256, (buffer, p) -> returnedBuffers.offer(buffer)); |
| |
| Thread blocked = new Thread(() -> { |
| for (int ii = 0; ii < 512; ii++) |
| pool.write(ImmutableList.of(UUID.randomUUID()), HintsBufferTest.createHint(ii, ii)); |
| }); |
| blocked.start(); |
| |
| Util.spinAssertEquals(State.WAITING, () -> blocked.getState(), 1); |
| |
| while (blocked.isAlive()) |
| if (!returnedBuffers.isEmpty()) |
| pool.offer(returnedBuffers.poll().recycle()); |
| |
| assertTrue(blockedOnBackpressure); |
| } |
| } |