/*
* 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.synapse.eventing;
import org.apache.axiom.soap.SOAPEnvelope;
import org.apache.axis2.AxisFault;
import org.apache.axis2.context.MessageContext;
import org.apache.axis2.description.AxisOperation;
import org.apache.axis2.description.AxisService;
import org.apache.axis2.description.InOutAxisOperation;
import org.apache.axis2.engine.AxisConfiguration;
import org.apache.axis2.engine.AxisEngine;
import org.apache.axis2.util.MessageContextBuilder;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.SynapseConstants;
import org.apache.synapse.SynapseException;
import org.apache.synapse.endpoints.Endpoint;
import org.apache.synapse.endpoints.AddressEndpoint;
import org.apache.synapse.endpoints.EndpointDefinition;
import org.apache.synapse.config.SynapseConfiguration;
import org.apache.synapse.core.SynapseEnvironment;
import org.apache.synapse.core.axis2.Axis2MessageContext;
import org.apache.synapse.core.axis2.SynapseMessageReceiver;
import org.apache.synapse.eventing.builders.ResponseMessageBuilder;
import org.apache.synapse.eventing.builders.SubscriptionMessageBuilder;
import org.apache.synapse.util.MessageHelper;
import org.wso2.eventing.EventingConstants;
import org.wso2.eventing.Subscription;
import org.wso2.eventing.Event;
import org.wso2.eventing.SubscriptionManager;
import org.wso2.eventing.exceptions.EventException;
import javax.xml.namespace.QName;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Eventsource that accepts the event requests using a message receiver.
* Eventsource is responsible on two tasks accepting the subscriptions and subscription related
* reqests and dispatching events.
* Subscriptions contains operations listed in the WS-Eventing specification. {SubscribeOP,
* UnsubscribeOP, RenewOP, GetstatusOP, SubscriptionEndOP}
* based on the action in the request eventsource identify the operation and send it for processing.
* Eventsource link with a subscription manager to store the subscriptions.
*/
public class SynapseEventSource extends SynapseMessageReceiver {
private String name;
private SubscriptionManager subscriptionManager;
private static final Log log = LogFactory.getLog(SynapseEventSource.class);
private String fileName;
/* Contains properties used in the configuration and possess confidential information such as
encrypted passwords */
private Map<String, String> configurationProperties = new HashMap<String, String>();
public SynapseEventSource(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public SubscriptionManager getSubscriptionManager() {
return subscriptionManager;
}
public void setSubscriptionManager(SubscriptionManager subscriptionManager) {
this.subscriptionManager = subscriptionManager;
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
public void buildService(AxisConfiguration axisCfg) throws AxisFault {
AxisService eventSourceService = new AxisService();
eventSourceService.setName(this.name);
// Add wse operations
addOperations(eventSourceService);
axisCfg.addService(eventSourceService);
//Set the service parameters
eventSourceService
.addParameter(EventingConstants.SUBSCRIPTION_MANAGER, subscriptionManager);
eventSourceService.addParameter(SynapseEventingConstants.SERVICE_TYPE,
SynapseEventingConstants.EVENTING_ST);
}
/**
* Override the Message receiver method to accept subscriptions and events
*
* @param mc message context
* @throws AxisFault
*/
public void receive(MessageContext mc) throws AxisFault {
// Create synapse message context from the axis2 message context
SynapseConfiguration synCfg = (SynapseConfiguration) mc.getConfigurationContext()
.getAxisConfiguration().getParameter(SynapseConstants.SYNAPSE_CONFIG).getValue();
SynapseEnvironment synEnv = (SynapseEnvironment) mc.getConfigurationContext()
.getAxisConfiguration().getParameter(SynapseConstants.SYNAPSE_ENV).getValue();
org.apache.synapse.MessageContext smc = new Axis2MessageContext(mc, synCfg, synEnv);
// initialize the response message builder using the message context
ResponseMessageBuilder messageBuilder = new ResponseMessageBuilder(mc);
try {
if (EventingConstants.WSE_SUBSCRIBE.equals(mc.getWSAAction())) {
// add new subscription to the SynapseSubscription store through subscription manager
processSubscriptionRequest(mc, messageBuilder);
} else if (EventingConstants.WSE_UNSUBSCRIBE.equals(mc.getWSAAction())) {
// Unsubscribe the matching subscription
processUnSubscribeRequest(mc, messageBuilder);
} else if (EventingConstants.WSE_GET_STATUS.equals(mc.getWSAAction())) {
// Response with the status of the subscription
processGetStatusRequest(mc, messageBuilder);
} else if (EventingConstants.WSE_RENEW.equals(mc.getWSAAction())) {
// Renew subscription
processReNewRequest(mc, messageBuilder);
} else {
// Treat as an Event
if (log.isDebugEnabled()) {
log.debug("Event received");
}
dispatchEvents(smc);
}
} catch (EventException e) {
handleException("Subscription manager processing error", e);
}
}
/**
* Dispatch the message to the target endpoint
*
* @param soapEnvelope Soap Enevlop with message
* @param responseAction WSE action for the response
* @param mc Message Context
* @param faultMessage Fault message
* @throws AxisFault AxisFault
*/
private void dispatchResponse(SOAPEnvelope soapEnvelope,
String responseAction,
MessageContext mc,
boolean faultMessage) throws AxisFault {
MessageContext rmc = MessageContextBuilder.createOutMessageContext(mc);
rmc.getOperationContext().addMessageContext(rmc);
rmc.setEnvelope(soapEnvelope);
rmc.setWSAAction(responseAction);
rmc.setSoapAction(responseAction);
rmc.setProperty(SynapseConstants.ISRESPONSE_PROPERTY, Boolean.TRUE);
if (faultMessage) {
AxisEngine.sendFault(rmc);
} else {
AxisEngine.send(rmc);
}
}
/**
* Public method for event dispatching, used by the eventPublisher mediator and eventSource
*
* @param msgCtx message context
*/
public void dispatchEvents(org.apache.synapse.MessageContext msgCtx) {
List<Subscription> subscribers = null;
// Call event dispatcher
msgCtx.getEnvironment().getExecutorService()
.execute(new EventDispatcher(msgCtx));
}
/**
* Dispatching events async on a different thread
*/
class EventDispatcher implements Runnable {
private org.apache.synapse.MessageContext synCtx;
private List<Subscription> subscriptions;
EventDispatcher(org.apache.synapse.MessageContext synCtx) {
this.synCtx = synCtx;
}
public void run() {
try {
MessageContext msgCtx = ((Axis2MessageContext) synCtx).getAxis2MessageContext();
Event<MessageContext> event = new Event(msgCtx);
subscriptions = subscriptionManager.getMatchingSubscriptions(event);
} catch (EventException e) {
handleException("Matching subscriptions fetching error", e);
}
for (Subscription subscription : subscriptions) {
synCtx.setProperty(SynapseConstants.OUT_ONLY,
"true"); // Set one way message for events
try {
getEndpointFromURL(subscription.getEndpointUrl())
.send(MessageHelper.cloneMessageContext(synCtx));
} catch (AxisFault axisFault) {
log.error("Event sending failure " + axisFault.toString());
}
if (log.isDebugEnabled()) {
log.debug("Event push to : " + subscription.getEndpointUrl());
}
}
}
}
/**
* Process the subscription message request
*
* @param mc axis2 message context
* @param messageBuilder respose message builder
* @throws AxisFault axis fault
* @throws EventException eventing exception
*/
private void processSubscriptionRequest(MessageContext mc,
ResponseMessageBuilder messageBuilder)
throws AxisFault, EventException {
SynapseSubscription subscription = SubscriptionMessageBuilder.createSubscription(mc);
if (log.isDebugEnabled()) {
log.debug("SynapseSubscription request recived : " + subscription.getId());
}
if (subscription.getId() != null) {
String subID = subscriptionManager.subscribe(subscription);
if (subID != null) {
// Send the subscription responce
if (log.isDebugEnabled()) {
log.debug("Sending subscription response for SynapseSubscription ID : " +
subscription.getId());
}
SOAPEnvelope soapEnvelope =
messageBuilder.genSubscriptionResponse(subscription);
dispatchResponse(soapEnvelope, EventingConstants.WSE_SUbSCRIBE_RESPONSE,
mc, false);
} else {
// Send the Fault responce
if (log.isDebugEnabled()) {
log.debug("SynapseSubscription Failed, sending fault response");
}
SOAPEnvelope soapEnvelope = messageBuilder.genFaultResponse(mc,
EventingConstants.WSE_FAULT_CODE_RECEIVER, "EventSourceUnableToProcess",
"Unable to subscribe ", "");
dispatchResponse(soapEnvelope, EventingConstants.WSA_FAULT, mc,
true);
}
} else {
// Send the Fault responce
if (log.isDebugEnabled()) {
log.debug("SynapseSubscription Failed, sending fault response");
}
SOAPEnvelope soapEnvelope = messageBuilder.genFaultResponse(mc,
SubscriptionMessageBuilder.getErrorCode(),
SubscriptionMessageBuilder.getErrorSubCode(),
SubscriptionMessageBuilder.getErrorReason(), "");
dispatchResponse(soapEnvelope, EventingConstants.WSA_FAULT, mc,
true);
}
}
/**
* Process the UnSubscribe message request
*
* @param mc axis2 message context
* @param messageBuilder respose message builder
* @throws AxisFault axis fault
* @throws EventException eventing exception
*/
private void processUnSubscribeRequest(MessageContext mc,
ResponseMessageBuilder messageBuilder)
throws AxisFault, EventException {
SynapseSubscription subscription =
SubscriptionMessageBuilder.createUnSubscribeMessage(mc);
if (log.isDebugEnabled()) {
log.debug("UnSubscribe response recived for SynapseSubscription ID : " +
subscription.getId());
}
if (subscriptionManager.unsubscribe(subscription.getId())) {
//send the response
if (log.isDebugEnabled()) {
log.debug("Sending UnSubscribe responce for SynapseSubscription ID : " +
subscription.getId());
}
SOAPEnvelope soapEnvelope = messageBuilder.genUnSubscribeResponse(subscription);
dispatchResponse(soapEnvelope, EventingConstants.WSE_UNSUBSCRIBE_RESPONSE,
mc, false);
} else {
// Send the Fault responce
if (log.isDebugEnabled()) {
log.debug("UnSubscription failed, sending fault repsponse");
}
SOAPEnvelope soapEnvelope = messageBuilder.genFaultResponse(mc,
EventingConstants.WSE_FAULT_CODE_RECEIVER, "EventSourceUnableToProcess",
"Unable to Unsubscribe", "");
dispatchResponse(soapEnvelope, EventingConstants.WSA_FAULT, mc,
true);
}
}
/**
* Process the GetStatus message request
*
* @param mc axis2 message context
* @param messageBuilder respose message builder
* @throws AxisFault axis fault
* @throws EventException event
*/
private void processGetStatusRequest(MessageContext mc,
ResponseMessageBuilder messageBuilder)
throws AxisFault, EventException {
Subscription subscription =
SubscriptionMessageBuilder.createGetStatusMessage(mc);
if (log.isDebugEnabled()) {
log.debug("GetStatus request recived for SynapseSubscription ID : " +
subscription.getId());
}
subscription = subscriptionManager.getSubscription(subscription.getId());
if (subscription != null) {
if (log.isDebugEnabled()) {
log.debug("Sending GetStatus responce for SynapseSubscription ID : " +
subscription.getId());
}
//send the responce
SOAPEnvelope soapEnvelope = messageBuilder.genGetStatusResponse(subscription);
dispatchResponse(soapEnvelope, EventingConstants.WSE_GET_STATUS_RESPONSE,
mc, false);
} else {
// Send the Fault responce
if (log.isDebugEnabled()) {
log.debug("GetStatus failed, sending fault response");
}
SOAPEnvelope soapEnvelope = messageBuilder.genFaultResponse(mc,
EventingConstants.WSE_FAULT_CODE_RECEIVER, "EventSourceUnableToProcess",
"Subscription Not Found", "");
dispatchResponse(soapEnvelope, EventingConstants.WSA_FAULT, mc,
true);
}
}
/**
* Process the ReNew message request
*
* @param mc axis2 message context
* @param messageBuilder respose message builder
* @throws AxisFault axis fault
* @throws EventException event exception
*/
private void processReNewRequest(MessageContext mc,
ResponseMessageBuilder messageBuilder)
throws AxisFault, EventException {
SynapseSubscription subscription =
SubscriptionMessageBuilder.createRenewSubscribeMessage(mc);
if (log.isDebugEnabled()) {
log.debug("ReNew request recived for SynapseSubscription ID : " +
subscription.getId());
}
String subID = subscription.getId();
if (subID != null) {
if (subscriptionManager.renew(subscription)) {
//send the response
if (log.isDebugEnabled()) {
log.debug("Sending ReNew response for SynapseSubscription ID : " +
subscription.getId());
}
SOAPEnvelope soapEnvelope =
messageBuilder.genRenewSubscriptionResponse(subscription);
dispatchResponse(soapEnvelope, EventingConstants.WSE_RENEW_RESPONSE,
mc, false);
} else {
// Send the Fault responce
if (log.isDebugEnabled()) {
log.debug("ReNew failed, sending fault response");
}
SOAPEnvelope soapEnvelope = messageBuilder.genFaultResponse(mc,
EventingConstants.WSE_FAULT_CODE_RECEIVER, "UnableToRenew",
"Subscription Not Found", "");
dispatchResponse(soapEnvelope, EventingConstants.WSA_FAULT, mc,
true);
}
} else {
SOAPEnvelope soapEnvelope = messageBuilder.genFaultResponse(mc,
SubscriptionMessageBuilder.getErrorCode(),
SubscriptionMessageBuilder.getErrorSubCode(),
SubscriptionMessageBuilder.getErrorReason(), "");
dispatchResponse(soapEnvelope, EventingConstants.WSA_FAULT, mc, true);
}
}
/**
* Create a Endpoint for a given URL
*
* @param endpointUrl URL
* @return AddressEndpoint address endpoint
*/
private Endpoint getEndpointFromURL(String endpointUrl) {
AddressEndpoint endpoint = new AddressEndpoint();
EndpointDefinition def = new EndpointDefinition();
def.setAddress(endpointUrl.trim());
endpoint.setDefinition(def);
return endpoint;
}
/**
* Set the operations avilable for EventSource service
*
* @param eventSourceService service
* @throws AxisFault axis fault
*/
private void addOperations(AxisService eventSourceService) throws AxisFault {
// Create operations
AxisOperation mediateOperation =
new InOutAxisOperation(SynapseConstants.SYNAPSE_OPERATION_NAME);
AxisOperation subscribeOperation =
new InOutAxisOperation(new QName(EventingConstants.WSE_SUBSCRIBE_OP));
AxisOperation unsubscribeOperation =
new InOutAxisOperation(new QName(EventingConstants.WSE_UNSUBSCRIBE_OP));
AxisOperation renewOperation =
new InOutAxisOperation(new QName(EventingConstants.WSE_RENEW_OP));
AxisOperation getStatusOperation =
new InOutAxisOperation(new QName(EventingConstants.WSE_GET_STATUS_OP));
AxisOperation subscriptionEndOperation =
new InOutAxisOperation(new QName(EventingConstants.WSE_SUBSCRIPTIONEND_OP));
// Assign the message reciver
mediateOperation.setMessageReceiver(this);
subscribeOperation.setMessageReceiver(this);
unsubscribeOperation.setMessageReceiver(this);
renewOperation.setMessageReceiver(this);
getStatusOperation.setMessageReceiver(this);
subscriptionEndOperation.setMessageReceiver(this);
// Set Soap Action
subscribeOperation.setSoapAction(EventingConstants.WSE_SUBSCRIBE);
unsubscribeOperation.setSoapAction(EventingConstants.WSE_UNSUBSCRIBE);
renewOperation.setSoapAction(EventingConstants.WSE_RENEW);
getStatusOperation.setSoapAction(EventingConstants.WSE_GET_STATUS);
// Add operations to the Service
eventSourceService.addOperation(mediateOperation);
eventSourceService.addOperation(subscribeOperation);
eventSourceService.addOperation(unsubscribeOperation);
eventSourceService.addOperation(renewOperation);
eventSourceService.addOperation(getStatusOperation);
eventSourceService.addOperation(subscriptionEndOperation);
}
// Methods for accessing configuration properties - self-explainable
public void putConfigurationProperty(String name, String value) {
configurationProperties.put(name, value);
}
public String getConfigurationProperty(String name) {
return configurationProperties.get(name);
}
public boolean isContainsConfigurationProperty(String name) {
return configurationProperties.containsKey(name);
}
private void handleException(String message, Exception e) {
log.error(message, e);
throw new SynapseException(message, e);
}
}