| /* |
| * 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.servicecomb.http.client.task; |
| |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.RejectedExecutionException; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class AbstractTask { |
| public class BackOffSleepTask implements Task { |
| final long base = 3000; |
| |
| final long max = 10 * 60 * 10000; |
| |
| long waitTime; |
| |
| Task nextTask; |
| |
| public BackOffSleepTask(int failedCount, Task nextTask) { |
| this.waitTime = failedCount * failedCount * base; |
| this.nextTask = nextTask; |
| } |
| |
| public BackOffSleepTask(long waitTime, Task nextTask) { |
| this.waitTime = waitTime; |
| this.nextTask = nextTask; |
| } |
| |
| @Override |
| public void execute() { |
| long time = Math.min(max, waitTime); |
| try { |
| Thread.sleep(time); |
| } catch (InterruptedException e) { |
| LOGGER.error("unexpected interrupt during sleep", e); |
| } |
| startTask(nextTask); |
| } |
| } |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger(AbstractTask.class); |
| |
| protected ExecutorService taskPool; |
| |
| private volatile boolean running = true; |
| |
| protected AbstractTask(String taskName) { |
| initTaskPool(taskName); |
| Runtime.getRuntime().addShutdownHook(new Thread(taskName + "-shutdown-hook") { |
| @Override |
| public void run() { |
| AbstractTask.this.stop(); |
| } |
| }); |
| } |
| |
| protected void initTaskPool(String taskName) { |
| this.taskPool = Executors.newSingleThreadExecutor((task) -> |
| new Thread(task, taskName)); |
| } |
| |
| protected void startTask(Task task) { |
| if (!running) { |
| return; |
| } |
| |
| try { |
| this.taskPool.execute(() -> { |
| try { |
| task.execute(); |
| } catch (Throwable e) { |
| LOGGER.error("unexpected error execute task {}", task.getClass().getName(), e); |
| } |
| }); |
| } catch (RejectedExecutionException e) { |
| LOGGER.error("execute task rejected {}", task.getClass().getName(), e); |
| } |
| } |
| |
| public void stop() { |
| try { |
| running = false; |
| this.taskPool.shutdown(); |
| this.taskPool.awaitTermination(10, TimeUnit.SECONDS); |
| } catch (InterruptedException e) { |
| LOGGER.warn("tasks not shutdown in time {}", e.getMessage()); |
| } |
| } |
| } |