/*
* Copyright 2004,2005 The Apache Software Foundation.
*
* 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.cep.core.listener;
import org.apache.axiom.om.OMElement;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.broker.core.BrokerConfiguration;
import org.wso2.carbon.cep.core.Output;
import org.wso2.carbon.cep.core.internal.config.BrokerConfigurationHelper;
import org.wso2.carbon.cep.core.internal.process.CEPEventProcessor;
import org.wso2.carbon.cep.core.internal.ds.CEPServiceValueHolder;
import org.wso2.carbon.broker.core.exception.BrokerEventProcessingException;
import org.wso2.carbon.broker.core.BrokerService;
import org.wso2.carbon.core.multitenancy.SuperTenantCarbonContext;
import java.util.List;
/**
* this class used to receive the events from the cep engine. And then it passes those events
* through the event sender.
*/
public class CEPEventListener {
private static final Log log = LogFactory.getLog(CEPEventListener.class);
private Output output;
private int tenantId;
private String userName;
public CEPEventListener(Output output, int tenantId, String userName) {
this.output = output;
this.tenantId = tenantId;
this.userName = userName;
}
/**
* this method is called by the back end runtime engine. then it process the events and
* convert them back to omElements as specified in the event description elements.
*
* @param events - row events generated by the cep engine
*/
public void onComplexEvent(List events) {
try {
SuperTenantCarbonContext.startTenantFlow();
SuperTenantCarbonContext.getCurrentContext().setTenantId(tenantId);
SuperTenantCarbonContext.getCurrentContext().getTenantDomain(true);
SuperTenantCarbonContext.getCurrentContext().setUsername(userName);
OMElement omElementToSend = null;
for (Object event : events) {
if (output.getXmlMapping() != null) {
omElementToSend =
CEPEventProcessor.getXMLElement(event, output.getXmlMapping());
} else if (output.getElementMapping() != null) {
omElementToSend =
CEPEventProcessor.getXMLElement(event, output.getElementMapping());
}
if (output.getBrokerName() != null) {
BrokerService brokerService = CEPServiceValueHolder.getInstance().getBrokerService();
BrokerConfigurationHelper brokerConfigurationHelper = new BrokerConfigurationHelper();
BrokerConfiguration brokerConfiguration =
brokerConfigurationHelper.getBrokerConfiguration(output.getBrokerName(), tenantId);
brokerService.publish(brokerConfiguration,
output.getTopic(),
omElementToSend);
}
}
} catch (BrokerEventProcessingException e) {
log.error("Can not send the message using broker ", e);
} finally {
SuperTenantCarbonContext.endTenantFlow();
}
}
}