| // 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.cloudstack.poll; |
| |
| import com.cloud.utils.component.Manager; |
| import com.cloud.utils.component.ManagerBase; |
| import com.cloud.utils.concurrency.NamedThreadFactory; |
| import com.cloud.utils.exception.CloudRuntimeException; |
| import com.google.common.base.Preconditions; |
| import org.apache.log4j.Logger; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| public final class BackgroundPollManagerImpl extends ManagerBase implements BackgroundPollManager, Manager { |
| public static final Logger LOG = Logger.getLogger(BackgroundPollManagerImpl.class); |
| |
| private ScheduledExecutorService backgroundPollTaskScheduler; |
| private List<BackgroundPollTask> submittedTasks = new ArrayList<>(); |
| private volatile boolean isConfiguredAndStarted = false; |
| |
| public long getInitialDelay() { |
| return 5000L; |
| } |
| |
| public long getRoundDelay() { |
| return 4000L; |
| } |
| |
| @Override |
| public boolean start() { |
| if (isConfiguredAndStarted) { |
| return true; |
| } |
| backgroundPollTaskScheduler = Executors.newScheduledThreadPool(submittedTasks.size() + 1, new NamedThreadFactory("BackgroundTaskPollManager")); |
| for (final BackgroundPollTask task : submittedTasks) { |
| Long delay = task.getDelay(); |
| if (delay == null) { |
| delay = getRoundDelay(); |
| } |
| backgroundPollTaskScheduler.scheduleWithFixedDelay(task, getInitialDelay(), delay, TimeUnit.MILLISECONDS); |
| LOG.debug("Scheduled background poll task: " + task.getClass().getName()); |
| } |
| isConfiguredAndStarted = true; |
| return true; |
| } |
| |
| @Override |
| public boolean stop() { |
| if (isConfiguredAndStarted) { |
| backgroundPollTaskScheduler.shutdown(); |
| } |
| return true; |
| } |
| |
| @Override |
| public void submitTask(final BackgroundPollTask task) { |
| Preconditions.checkNotNull(task); |
| if (isConfiguredAndStarted) { |
| throw new CloudRuntimeException("Background Poll Manager cannot accept poll task as it has been configured and started."); |
| } |
| LOG.debug("Background Poll Manager received task: " + task.getClass().getSimpleName()); |
| submittedTasks.add(task); |
| } |
| } |