| /* |
| * 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.karaf.decanter.scheduler.simple; |
| |
| import java.util.Dictionary; |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.concurrent.*; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import org.apache.karaf.decanter.api.Scheduler; |
| import org.osgi.service.component.ComponentContext; |
| import org.osgi.service.component.annotations.Activate; |
| import org.osgi.service.component.annotations.Component; |
| import org.osgi.service.component.annotations.Reference; |
| import org.osgi.service.component.annotations.ReferenceCardinality; |
| import org.osgi.service.component.annotations.ReferencePolicy; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Very simple Decanter scheduler using a single thread. |
| */ |
| @Component( |
| name = "org.apache.karaf.decanter.scheduler.simple", |
| immediate = true |
| ) |
| public class SimpleScheduler implements Runnable, Scheduler { |
| private final static Logger LOGGER = LoggerFactory.getLogger(SimpleScheduler.class); |
| |
| private AtomicBoolean running = new AtomicBoolean(false); |
| |
| private long period = 5000; |
| private long threadIdleTimeout = 60000; |
| private int threadInitCount = 5; |
| private int threadMaxCount = 200; |
| |
| private ExecutorService executorService; |
| |
| Set<Runnable> collectors; |
| |
| public SimpleScheduler() { |
| collectors = new HashSet<>(); |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Activate |
| public void activate(ComponentContext context) { |
| configure(context.getProperties()); |
| start(); |
| } |
| |
| public void configure(Dictionary<String, String> config) { |
| String periodSt = config.get("period"); |
| period = periodSt != null ? Integer.parseInt(periodSt) : 5000; |
| String threadIdleTimeoutSt = config.get("threadIdleTimeout"); |
| threadIdleTimeout = threadIdleTimeoutSt != null ? Integer.parseInt(threadIdleTimeoutSt) : 60000; |
| String threadInitCountSt = config.get("threadInitCount"); |
| threadInitCount = threadInitCountSt != null ? Integer.parseInt(threadInitCountSt) : 5; |
| String threadMaxCountSt = config.get("threadMaxCount"); |
| threadMaxCount = threadMaxCountSt != null ? Integer.parseInt(threadMaxCountSt) : 200; |
| } |
| |
| @Override |
| public void run() { |
| LOGGER.debug("Decanter SimpleScheduler thread started ..."); |
| |
| while (running.get()) { |
| LOGGER.debug("Calling the collectors ..."); |
| for (Runnable collector : collectors) { |
| try { |
| executorService.execute(collector); |
| } catch (Exception e) { |
| LOGGER.warn("Can't collect data", e); |
| } |
| } |
| sleep(); |
| } |
| |
| LOGGER.debug("Decanter SimpleScheduler thread stopped ..."); |
| } |
| |
| private void sleep() { |
| try { |
| Thread.sleep(period); |
| } catch (InterruptedException e) { |
| running.set(false); |
| Thread.currentThread().interrupt(); |
| } |
| } |
| |
| @Override |
| public void stop() { |
| try { |
| executorService.awaitTermination(60L, TimeUnit.SECONDS); |
| } catch (InterruptedException e) { |
| LOGGER.warn("Collectors still active", e); |
| } |
| executorService.shutdownNow(); |
| running.set(false); |
| } |
| |
| @Override |
| public void start() { |
| if (running.compareAndSet(false, true)) { |
| executorService = new ThreadPoolExecutor(threadInitCount, |
| threadMaxCount, threadIdleTimeout, TimeUnit.SECONDS, |
| new SynchronousQueue<Runnable>(), Executors.defaultThreadFactory(), |
| new ThreadPoolExecutor.CallerRunsPolicy()); |
| Thread thread = new Thread(this, "decanter-scheduler-simple"); |
| thread.start(); |
| } |
| } |
| |
| @Override |
| public boolean isStarted() throws Exception { |
| return running.get(); |
| } |
| |
| @Override |
| public String state() { |
| return running.get() ? "Started" : "Stopped"; |
| } |
| |
| @Reference(target="(decanter.collector.name=*)", cardinality=ReferenceCardinality.MULTIPLE, policy=ReferencePolicy.DYNAMIC) |
| public void setCollector(Runnable collector) { |
| this.collectors.add(collector); |
| } |
| |
| public void unsetCollector(Runnable collector) { |
| this.collectors.remove(collector); |
| } |
| |
| } |