| /* |
| * 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.jackrabbit.oak.run.osgi; |
| |
| import java.io.Closeable; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| import com.google.common.base.Supplier; |
| import com.google.common.base.Suppliers; |
| import org.apache.jackrabbit.oak.Oak; |
| import org.apache.jackrabbit.oak.commons.PropertiesUtil; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.BundleEvent; |
| import org.osgi.framework.Filter; |
| import org.osgi.framework.FrameworkUtil; |
| import org.osgi.framework.InvalidSyntaxException; |
| import org.osgi.framework.ServiceReference; |
| import org.osgi.framework.SynchronousBundleListener; |
| import org.osgi.util.tracker.ServiceTracker; |
| |
| public class RunnableJobTracker extends ServiceTracker<Runnable, Future> |
| implements Closeable, SynchronousBundleListener { |
| /** |
| * Lazily loaded executor |
| */ |
| private final Supplier<ScheduledExecutorService> executor = |
| Suppliers.memoize(new Supplier<ScheduledExecutorService>() { |
| @Override |
| public ScheduledExecutorService get() { |
| return Oak.defaultScheduledExecutor(); |
| } |
| }); |
| |
| public RunnableJobTracker(BundleContext context) { |
| super(context, createFilter(), null); |
| open(); |
| context.addBundleListener(this); |
| } |
| |
| @Override |
| public Future addingService(ServiceReference<Runnable> reference) { |
| Runnable runnable = context.getService(reference); |
| long period = PropertiesUtil.toLong(reference.getProperty("scheduler.period"), -1); |
| boolean concurrent = PropertiesUtil.toBoolean(reference.getProperty("scheduler.concurrent"), false); |
| Future future = null; |
| if (period != -1) { |
| if (concurrent) { |
| future = getExecutor().scheduleAtFixedRate( |
| runnable, period, period, TimeUnit.SECONDS); |
| } else { |
| future = getExecutor().scheduleWithFixedDelay( |
| runnable, period, period, TimeUnit.SECONDS); |
| } |
| } |
| return future; |
| } |
| |
| @Override |
| public void removedService(ServiceReference reference, Future future) { |
| future.cancel(false); |
| } |
| |
| @Override |
| public void close() { |
| super.close(); |
| getExecutor().shutdown(); |
| } |
| |
| @Override |
| public void bundleChanged(BundleEvent bundleEvent) { |
| //Look for close event of system bundle to shutdown executor |
| //Ideally we should listen to FrameworkEvent but PojoSR |
| //currently does not emit framework event |
| if(bundleEvent.getBundle().getBundleId() == 0 |
| && bundleEvent.getType() == bundleEvent.STOPPED){ |
| close(); |
| } |
| } |
| |
| private ScheduledExecutorService getExecutor(){ |
| return executor.get(); |
| } |
| |
| private static Filter createFilter() { |
| try { |
| return FrameworkUtil.createFilter("(&(objectclass=java.lang.Runnable)(scheduler.period=*))"); |
| } catch (InvalidSyntaxException e) { |
| throw new IllegalArgumentException(e); |
| } |
| } |
| } |