| /** |
| * 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.camel.bam.processor; |
| |
| import java.util.Date; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import javax.persistence.EntityManager; |
| import javax.persistence.EntityManagerFactory; |
| import javax.persistence.LockModeType; |
| import javax.persistence.PersistenceException; |
| |
| import org.apache.camel.bam.EntityManagerCallback; |
| import org.apache.camel.bam.EntityManagerTemplate; |
| import org.apache.camel.bam.QueryUtils; |
| import org.apache.camel.bam.model.ActivityState; |
| import org.apache.camel.bam.rules.ProcessRules; |
| import org.apache.camel.support.ServiceSupport; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.springframework.transaction.TransactionStatus; |
| import org.springframework.transaction.support.TransactionCallbackWithoutResult; |
| import org.springframework.transaction.support.TransactionTemplate; |
| |
| /** |
| * A timer engine to monitor for expired activities and perform whatever actions |
| * are required. |
| * |
| * @version |
| */ |
| public class ActivityMonitorEngine extends ServiceSupport implements Runnable { |
| private static final Logger LOG = LoggerFactory.getLogger(ActivityMonitorEngine.class); |
| private EntityManagerFactory entityManagerFactory; |
| private EntityManagerTemplate entityManagerTemplate; |
| private TransactionTemplate transactionTemplate; |
| private ProcessRules rules; |
| private long windowMillis = 1000L; |
| private Thread thread; |
| private boolean useLocking; |
| |
| public ActivityMonitorEngine(EntityManagerFactory entityManagerFactory, TransactionTemplate transactionTemplate, ProcessRules rules) { |
| this.entityManagerFactory = entityManagerFactory; |
| this.entityManagerTemplate = new EntityManagerTemplate(entityManagerFactory); |
| this.transactionTemplate = transactionTemplate; |
| this.rules = rules; |
| } |
| |
| public boolean isUseLocking() { |
| return useLocking; |
| } |
| |
| public void setUseLocking(boolean useLocking) { |
| this.useLocking = useLocking; |
| } |
| |
| public void run() { |
| LOG.debug("Starting to poll for timeout events"); |
| |
| while (!isStopped()) { |
| try { |
| long now = System.currentTimeMillis(); |
| long nextPoll = now + windowMillis; |
| final Date timeNow = new Date(now); |
| |
| transactionTemplate.execute(new TransactionCallbackWithoutResult() { |
| protected void doInTransactionWithoutResult(TransactionStatus status) { |
| Map<String, Object> params = new HashMap<String, Object>(1); |
| params.put("timeNow", timeNow); |
| |
| String activityStateQuery = "select x from " |
| + QueryUtils.getTypeName(ActivityState.class) + " x where x.timeOverdue < :timeNow"; |
| List<ActivityState> list = entityManagerTemplate.find(ActivityState.class, |
| activityStateQuery, params); |
| for (ActivityState activityState : list) { |
| fireExpiredEvent(activityState); |
| } |
| } |
| }); |
| |
| long timeToSleep = nextPoll - System.currentTimeMillis(); |
| if (timeToSleep > 0) { |
| LOG.debug("Sleeping for {} millis", timeToSleep); |
| try { |
| Thread.sleep(timeToSleep); |
| } catch (InterruptedException e) { |
| // ignore |
| } |
| } |
| } catch (Exception e) { |
| LOG.warn("Error during running ActivityMonitorEngine. This exception is ignored.", e); |
| } |
| } |
| } |
| |
| protected void fireExpiredEvent(final ActivityState activityState) { |
| LOG.debug("Trying to fire expiration of: {}", activityState); |
| |
| entityManagerTemplate.execute(new EntityManagerCallback<Object>() { |
| public Object execute(EntityManager entityManager) throws PersistenceException { |
| // let's try locking the object first |
| if (isUseLocking()) { |
| LOG.debug("Attempting to lock: {}", activityState); |
| entityManager.lock(activityState, LockModeType.WRITE); |
| LOG.debug("Grabbed lock: {}", activityState); |
| } |
| |
| try { |
| rules.processExpired(activityState); |
| } catch (Exception e) { |
| LOG.error("Failed to process expiration of: " + activityState + ". Reason: " + e, e); |
| } |
| activityState.setTimeOverdue(null); |
| //activityState.setEscalationLevel(escalateLevel + 1); |
| return null; |
| } |
| }); |
| } |
| |
| protected void doStart() throws Exception { |
| rules.start(); |
| thread = new Thread(this, "ActivityMonitorEngine"); |
| thread.start(); |
| } |
| |
| protected void doStop() throws Exception { |
| if (thread != null) { |
| thread = null; |
| } |
| rules.stop(); |
| } |
| } |