| /** |
| * 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.lib.service.scheduler; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.lib.lang.RunnableCallable; |
| import org.apache.hadoop.lib.server.BaseService; |
| import org.apache.hadoop.lib.server.Server; |
| import org.apache.hadoop.lib.server.ServiceException; |
| import org.apache.hadoop.lib.service.Instrumentation; |
| import org.apache.hadoop.lib.service.Scheduler; |
| import org.apache.hadoop.lib.util.Check; |
| import org.apache.hadoop.util.Time; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.text.MessageFormat; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.ScheduledThreadPoolExecutor; |
| import java.util.concurrent.TimeUnit; |
| |
| @InterfaceAudience.Private |
| public class SchedulerService extends BaseService implements Scheduler { |
| private static final Logger LOG = LoggerFactory.getLogger(SchedulerService.class); |
| |
| private static final String INST_GROUP = "scheduler"; |
| |
| public static final String PREFIX = "scheduler"; |
| |
| public static final String CONF_THREADS = "threads"; |
| |
| private ScheduledExecutorService scheduler; |
| |
| public SchedulerService() { |
| super(PREFIX); |
| } |
| |
| @Override |
| public void init() throws ServiceException { |
| int threads = getServiceConfig().getInt(CONF_THREADS, 5); |
| scheduler = new ScheduledThreadPoolExecutor(threads); |
| LOG.debug("Scheduler started"); |
| } |
| |
| @Override |
| public void destroy() { |
| try { |
| long limit = Time.now() + 30 * 1000; |
| scheduler.shutdownNow(); |
| while (!scheduler.awaitTermination(1000, TimeUnit.MILLISECONDS)) { |
| LOG.debug("Waiting for scheduler to shutdown"); |
| if (Time.now() > limit) { |
| LOG.warn("Gave up waiting for scheduler to shutdown"); |
| break; |
| } |
| } |
| if (scheduler.isTerminated()) { |
| LOG.debug("Scheduler shutdown"); |
| } |
| } catch (InterruptedException ex) { |
| LOG.warn(ex.getMessage(), ex); |
| } |
| } |
| |
| @Override |
| public Class[] getServiceDependencies() { |
| return new Class[]{Instrumentation.class}; |
| } |
| |
| @Override |
| public Class getInterface() { |
| return Scheduler.class; |
| } |
| |
| @Override |
| public void schedule(final Callable<?> callable, long delay, long interval, TimeUnit unit) { |
| Check.notNull(callable, "callable"); |
| if (!scheduler.isShutdown()) { |
| LOG.debug("Scheduling callable [{}], interval [{}] seconds, delay [{}] in [{}]", |
| new Object[]{callable, delay, interval, unit}); |
| Runnable r = new Runnable() { |
| @Override |
| public void run() { |
| String instrName = callable.getClass().getSimpleName(); |
| Instrumentation instr = getServer().get(Instrumentation.class); |
| if (getServer().getStatus() == Server.Status.HALTED) { |
| LOG.debug("Skipping [{}], server status [{}]", callable, getServer().getStatus()); |
| instr.incr(INST_GROUP, instrName + ".skips", 1); |
| } else { |
| LOG.debug("Executing [{}]", callable); |
| instr.incr(INST_GROUP, instrName + ".execs", 1); |
| Instrumentation.Cron cron = instr.createCron().start(); |
| try { |
| callable.call(); |
| } catch (Exception ex) { |
| instr.incr(INST_GROUP, instrName + ".fails", 1); |
| LOG.error("Error executing [{}], {}", new Object[]{callable, ex.getMessage(), ex}); |
| } finally { |
| instr.addCron(INST_GROUP, instrName, cron.stop()); |
| } |
| } |
| } |
| }; |
| scheduler.scheduleWithFixedDelay(r, delay, interval, unit); |
| } else { |
| throw new IllegalStateException( |
| MessageFormat.format("Scheduler shutting down, ignoring scheduling of [{}]", callable)); |
| } |
| } |
| |
| @Override |
| public void schedule(Runnable runnable, long delay, long interval, TimeUnit unit) { |
| schedule((Callable<?>) new RunnableCallable(runnable), delay, interval, unit); |
| } |
| |
| } |