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* fix apache#466 add run oldest task reject policy * fix apache#466 optimize policy when queue is full all the time
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common/src/main/java/com/alibaba/fescar/common/thread/RejectedPolicys.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| package com.alibaba.fescar.common.thread; | ||
| /* | ||
| * Copyright 1999-2018 Alibaba Group Holding Ltd. | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
|
|
||
| import java.util.concurrent.BlockingQueue; | ||
| import java.util.concurrent.RejectedExecutionHandler; | ||
| import java.util.concurrent.ThreadPoolExecutor; | ||
|
|
||
| /** | ||
| * policys for RejectedExecutionHandler | ||
| * | ||
| * Created by guoyao on 2019/2/26. | ||
| */ | ||
| public final class RejectedPolicys { | ||
|
|
||
| /** | ||
| * when rejected happened ,add the new task and run the oldest task | ||
| * @return | ||
| */ | ||
| public static RejectedExecutionHandler runsOldestTaskPolicy() { | ||
| return new RejectedExecutionHandler() { | ||
| @Override | ||
| public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) { | ||
| if (executor.isShutdown()) { | ||
| return; | ||
| } | ||
| BlockingQueue<Runnable> workQueue=executor.getQueue(); | ||
| Runnable firstWork=workQueue.poll(); | ||
| boolean newTaskAdd=workQueue.offer(r); | ||
| if (firstWork != null) { | ||
| firstWork.run(); | ||
| } | ||
| if (!newTaskAdd) { | ||
| executor.execute(r); | ||
| } | ||
| } | ||
| }; | ||
| } | ||
| } |
84 changes: 84 additions & 0 deletions
84
common/src/test/java/com/alibaba/fescar/common/thread/RejectedPolicysTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| /* | ||
| * Copyright 1999-2018 Alibaba Group Holding Ltd. | ||
| * | ||
| * Licensed 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 com.alibaba.fescar.common.thread; | ||
|
|
||
| import org.junit.Test; | ||
| import org.testng.Assert; | ||
|
|
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| import java.util.concurrent.CountDownLatch; | ||
| import java.util.concurrent.LinkedBlockingQueue; | ||
| import java.util.concurrent.ThreadPoolExecutor; | ||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.concurrent.atomic.AtomicInteger; | ||
|
|
||
| /** | ||
| * Created by guoyao on 2019/2/26. | ||
| */ | ||
| public class RejectedPolicysTest { | ||
|
|
||
| private final int DEFAULT_CORE_POOL_SIZE=1; | ||
| private final int DEFAULT_KEEP_ALIVE_TIME=10; | ||
| private final int MAX_QUEUE_SIZE=1; | ||
|
|
||
| @Test | ||
| public void testRunsOldestTaskPolicy() throws Exception { | ||
| AtomicInteger atomicInteger=new AtomicInteger(); | ||
| ThreadPoolExecutor poolExecutor= | ||
| new ThreadPoolExecutor(DEFAULT_CORE_POOL_SIZE, DEFAULT_CORE_POOL_SIZE, DEFAULT_KEEP_ALIVE_TIME, TimeUnit.MILLISECONDS, | ||
| new LinkedBlockingQueue(MAX_QUEUE_SIZE), | ||
| new NamedThreadFactory("OldestRunsPolicy", DEFAULT_CORE_POOL_SIZE), RejectedPolicys.runsOldestTaskPolicy()); | ||
| CountDownLatch downLatch1=new CountDownLatch(1); | ||
| CountDownLatch downLatch2=new CountDownLatch(1); | ||
| //task1 | ||
| poolExecutor.execute(new Runnable() { | ||
| @Override | ||
| public void run() { | ||
| try { | ||
| //wait the oldest task of queue count down | ||
| downLatch1.await(); | ||
| } catch (InterruptedException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| atomicInteger.getAndAdd(1); | ||
| } | ||
| }); | ||
| Assert.assertEquals(atomicInteger.get(), 0); | ||
| //task2 | ||
| poolExecutor.execute(new Runnable() { | ||
| @Override | ||
| public void run() { | ||
| // run second | ||
| atomicInteger.getAndAdd(2); | ||
| } | ||
| }); | ||
| //task3 | ||
| poolExecutor.execute(new Runnable() { | ||
| @Override | ||
| public void run() { | ||
| downLatch2.countDown(); | ||
| atomicInteger.getAndAdd(3); | ||
| } | ||
| }); | ||
| //only the task2 run which is the oldest task of queue | ||
| Assert.assertEquals(atomicInteger.get(), 2); | ||
| downLatch1.countDown(); | ||
| downLatch2.await(); | ||
| //run task3 | ||
| Assert.assertEquals(atomicInteger.get(), 6); | ||
|
|
||
| } | ||
| } |
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