| /* |
| * 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.stratos.cep.extension; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.stratos.messaging.event.Event; |
| import org.apache.stratos.messaging.event.topology.CompleteTopologyEvent; |
| import org.apache.stratos.messaging.event.topology.MemberActivatedEvent; |
| import org.apache.stratos.messaging.event.topology.MemberTerminatedEvent; |
| import org.apache.stratos.messaging.listener.topology.CompleteTopologyEventListener; |
| import org.apache.stratos.messaging.listener.topology.MemberActivatedEventListener; |
| import org.apache.stratos.messaging.listener.topology.MemberTerminatedEventListener; |
| import org.apache.stratos.messaging.message.receiver.topology.TopologyEventReceiver; |
| import org.apache.stratos.messaging.message.receiver.topology.TopologyManager; |
| |
| /** |
| * CEP Topology Receiver for Fault Handling Window Processor. |
| */ |
| public class CEPTopologyEventReceiver { |
| private static final Log log = LogFactory.getLog(CEPTopologyEventReceiver.class); |
| private FaultHandlingWindowProcessor faultHandler; |
| private TopologyEventReceiver topologyEventReceiver; |
| |
| CEPTopologyEventReceiver(FaultHandlingWindowProcessor faultHandler) { |
| this.faultHandler = faultHandler; |
| this.topologyEventReceiver = TopologyEventReceiver.getInstance(); |
| addEventListeners(); |
| } |
| |
| private void addEventListeners() { |
| // Load member time stamp map from the topology as a one time task |
| topologyEventReceiver.addEventListener(new CompleteTopologyEventListener() { |
| private boolean initialized; |
| |
| @Override |
| protected void onEvent(Event event) { |
| if (!initialized) { |
| try { |
| TopologyManager.acquireReadLock(); |
| log.info("Complete topology event received to fault handling window processor."); |
| CompleteTopologyEvent completeTopologyEvent = (CompleteTopologyEvent) event; |
| initialized = faultHandler.loadTimeStampMapFromTopology(completeTopologyEvent.getTopology()); |
| } catch (Exception e) { |
| log.error("Error loading member time stamp map from complete topology event.", e); |
| } finally { |
| TopologyManager.releaseReadLock(); |
| } |
| } |
| } |
| }); |
| |
| // Remove member from the time stamp map when MemberTerminated event is received. |
| topologyEventReceiver.addEventListener(new MemberTerminatedEventListener() { |
| @Override |
| protected void onEvent(Event event) { |
| MemberTerminatedEvent memberTerminatedEvent = (MemberTerminatedEvent) event; |
| faultHandler.getMemberTimeStampMap().remove(memberTerminatedEvent.getMemberId()); |
| if (log.isDebugEnabled()) { |
| log.debug("Member was removed from the timestamp map: [member] " + memberTerminatedEvent |
| .getMemberId()); |
| |
| } |
| } |
| }); |
| |
| // Add member to time stamp map whenever member is activated |
| topologyEventReceiver.addEventListener(new MemberActivatedEventListener() { |
| @Override |
| protected void onEvent(Event event) { |
| MemberActivatedEvent memberActivatedEvent = (MemberActivatedEvent) event; |
| |
| // do not put this member if we have already received a health event |
| faultHandler.getMemberTimeStampMap().putIfAbsent(memberActivatedEvent.getMemberId(), |
| System.currentTimeMillis()); |
| if (log.isDebugEnabled()) { |
| log.debug("Member was added to the timestamp map: [member] " + memberActivatedEvent.getMemberId()); |
| } |
| } |
| }); |
| } |
| |
| void destroy() { |
| topologyEventReceiver.terminate(); |
| } |
| } |