/* * Copyright (c) 2006, WSO2 Inc. (http://www.wso2.org) All Rights Reserved. * * Licensed 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.wso2.carbon.mediator.event; import org.apache.axiom.om.OMElement; import org.apache.synapse.MessageContext; import org.apache.synapse.SynapseLog; import org.apache.synapse.core.axis2.Axis2MessageContext; import org.apache.synapse.mediators.AbstractMediator; import org.apache.synapse.mediators.Value; import org.apache.synapse.util.xpath.SynapseXPath; import org.jaxen.JaxenException; import org.wso2.carbon.context.PrivilegedCarbonContext; import org.wso2.carbon.event.core.EventBroker; import org.wso2.carbon.event.core.Message; import org.wso2.carbon.event.core.exception.EventBrokerException; import org.wso2.carbon.event.ws.internal.exception.WSEventException; import org.wso2.carbon.event.ws.internal.util.EventBrokerUtils; public class EventMediator extends AbstractMediator { private Value topic = null; private SynapseXPath expression = null; public boolean mediate(MessageContext synCtx) { if (synCtx.getEnvironment().isDebuggerEnabled()) { if (super.divertMediationRoute(synCtx)) { return true; } } SynapseLog synLog = getLog(synCtx); if (synLog.isTraceOrDebugEnabled()) { synLog.traceOrDebug("Start : Event mediator"); if (synLog.isTraceTraceEnabled()) { synLog.traceTrace("Message : " + synCtx.getEnvelope()); } } String topicValue = null; if (topic != null) { topicValue = topic.evaluateValue(synCtx); } else { org.apache.axis2.context.MessageContext mc = ((Axis2MessageContext)synCtx).getAxis2MessageContext(); try { topicValue = EventBrokerUtils.extractTopicFromMessage(mc); } catch (WSEventException e) { handleException("Error extracting the topic from the message", e, synCtx); } } if (topicValue == null) { handleException("Topic for the event cannot be found", synCtx); } else { org.apache.axis2.context.MessageContext mc = ((Axis2MessageContext)synCtx).getAxis2MessageContext(); EventBroker broker = (EventBroker) mc.getConfigurationContext(). getProperty("mediation.event.broker"); if (broker == null) { handleException("EventBroker cannot be found", synCtx); } else { Message message = new Message(); if (expression == null) { message.setMessage(synCtx.getEnvelope().getBody().getFirstElement()); } else { try { Object o = expression.selectSingleNode(synCtx); if (o instanceof OMElement) { message.setMessage((OMElement)o); } else { handleException("The result of the expression:" + expression + " should be an OMElement", synCtx); } } catch (JaxenException e) { handleException("Error evaluating the expression: " + expression, synCtx); } } try { broker.publish(message, topicValue); } catch (EventBrokerException e) { handleException("Error publishing the event to the broker", e, synCtx); } catch (Exception e) { log.error("Error in setting tenant information", e); } } } if (synLog.isTraceOrDebugEnabled()) { synLog.traceOrDebug("End : Event mediator"); if (synLog.isTraceTraceEnabled()) { synLog.traceTrace("Message : " + synCtx.getEnvelope()); } } return true; } public Value getTopic() { return topic; } public SynapseXPath getExpression() { return expression; } public void setTopic(Value topic) { this.topic = topic; } public void setExpression(SynapseXPath expression) { this.expression = expression; } }