Java tutorial
/* * Copyright (c) 2012, 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.bpel.b4p.extension; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.ode.bpel.common.FaultException; import org.apache.ode.bpel.runtime.extension.AbstractLongRunningExtensionOperation; import org.apache.ode.bpel.runtime.extension.ExtensionContext; import org.apache.ode.utils.DOMUtils; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.wso2.carbon.bpel.b4p.coordination.configuration.CoordinationConfiguration; import org.wso2.carbon.bpel.b4p.coordination.context.WSConstants; import org.wso2.carbon.bpel.b4p.coordination.dao.HTCoordinationDAOConnection; import org.wso2.carbon.bpel.b4p.internal.B4PContentHolder; import org.wso2.carbon.bpel.core.ode.integration.BPELServerImpl; import java.util.concurrent.Callable; import javax.xml.namespace.QName; /** * Class that implements <code><peopleActivity></code> related to BPEL4People. */ public class BPEL4PeopleExtensionOperation extends AbstractLongRunningExtensionOperation { private static Log log = LogFactory.getLog(BPEL4PeopleExtensionOperation.class); private static Log messageTraceLog = LogFactory.getLog(BPEL4PeopleConstants.MESSAGE_TRACE); private ExtensionContext extensionContext; private String cid; private String outputVarName; private PeopleActivity peopleActivity; /** * Initial stuff and calling an external service which causes to send back a response in an indefinite time. * Correlation values should be set within this method. * * @param extensionContext ExtensionContext * @param cid cid * @param element ExtensionActivity */ @Override public void runAsync(ExtensionContext extensionContext, String cid, Element element) throws FaultException { this.extensionContext = extensionContext; this.cid = cid; peopleActivity = new PeopleActivity(extensionContext, element); String taskID = peopleActivity.invoke(extensionContext); extensionContext.setCorrelationValues(new String[] { taskID }); extensionContext.setCorrelatorId(peopleActivity.inferCorrelatorId(extensionContext)); outputVarName = peopleActivity.getOutputVarName(); if (log.isDebugEnabled()) { log.debug("B4P extension invoked by Process " + peopleActivity.getProcessId() + ", pid:" + extensionContext.getInternalInstance().getPid() + ", task:" + taskID); } } /** * Called when the response for the above service is received * * @param mexId MessageExchange id */ @Override public void onRequestReceived(String mexId) throws FaultException { if (log.isDebugEnabled()) { log.debug("People Activity Response received : mexId " + mexId); } Element notificationMessageEle = extensionContext.getInternalInstance().getMyRequest(mexId); if ("".equals(outputVarName) || outputVarName == null) { // if output variable is null or empty, these is no way to process the response from the task as we do // not have // a variable from bpel file to assign the values to. Hence what what we can do is to return a fault and // exit. log.error( "Output variable not specified correctly for the remoteTask activity.Hence the error condition." + "Please verify and correct your BPEL process remoteTask"); extensionContext.completeWithFault(cid, new FaultException(BPEL4PeopleConstants.B4P_FAULT, BPEL4PeopleConstants.NON_RECOVERABLE_ERROR)); } else { Node part = extensionContext.getPartData(notificationMessageEle, outputVarName); if (messageTraceLog.isTraceEnabled()) { messageTraceLog.trace("B4P Response Message: " + DOMUtils.domToString(notificationMessageEle)); messageTraceLog.trace("B4P Response Part: " + DOMUtils.domToString(part)); } if (CoordinationConfiguration.getInstance().isHumantaskCoordinationEnabled() && notificationMessageEle.hasChildNodes()) { String taskID = ""; Element correlationHeader = DOMUtils.findChildByName(notificationMessageEle, new QName(BPEL4PeopleConstants.B4P_NAMESPACE, BPEL4PeopleConstants.B4P_CORRELATION_HEADER), true); if (correlationHeader != null) { taskID = correlationHeader.getAttributeNS(BPEL4PeopleConstants.B4P_NAMESPACE, BPEL4PeopleConstants.B4P_CORRELATION_HEADER_ATTRIBUTE); try { deleteCoordinationTaskData(taskID); } catch (Exception e) { log.error("Error occurred while cleaning coordination data for task id " + taskID, e); } } //Checking for fault Element fault = DOMUtils.findChildByName(notificationMessageEle, new QName(WSConstants.WS_HT_COORDINATION_PROTOCOL_FAULT)); if (fault != null) { if (fault.hasAttribute("headerPart")) { if (log.isDebugEnabled()) { log.debug( "Throwing Fault to People Activity Scope since received Fault Protocol Message " + "for task" + taskID + "."); } extensionContext.completeWithFault(cid, new FaultException(BPEL4PeopleConstants.B4P_FAULT, BPEL4PeopleConstants.NON_RECOVERABLE_ERROR)); ; } } //Checking for Skip Element skipped = DOMUtils.findChildByName(notificationMessageEle, new QName(WSConstants.WS_HT_COORDINATION_PROTOCOL_SKIPPED)); if (skipped != null) { if (skipped.hasAttribute("headerPart")) { if (log.isDebugEnabled()) { log.debug("Skipping People Activity since received Skipped Protocol Message for task " + taskID + "."); } //Set extension as complete, since task is skipped. No value write to output variable. extensionContext.complete(cid); return; } } } extensionContext.writeVariable(outputVarName, notificationMessageEle); extensionContext.complete(cid); } } private boolean deleteCoordinationTaskData(final String taskID) throws Exception { boolean success = (Boolean) ((BPELServerImpl) B4PContentHolder.getInstance().getBpelServer()).getScheduler() .execTransaction(new Callable<Object>() { @Override public Object call() throws Exception { HTCoordinationDAOConnection daoConnection = B4PContentHolder.getInstance() .getCoordinationController().getDaoConnectionFactory().getConnection(); return daoConnection.deleteTaskData(taskID); } }); return success; } }