+/*
+ * Copyright (C) 2010 Mathieu Baudier <mbaudier@argeo.org>
+ *
+ * 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.argeo.slc.jms;
import java.net.InetAddress;
import java.net.UnknownHostException;
+import java.util.List;
import java.util.UUID;
import javax.jms.Destination;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.argeo.slc.SlcException;
+import org.argeo.slc.core.runtime.DefaultAgent;
+import org.argeo.slc.execution.ExecutionModuleDescriptor;
+import org.argeo.slc.msg.ExecutionAnswer;
+import org.argeo.slc.msg.MsgConstants;
+import org.argeo.slc.msg.ReferenceList;
import org.argeo.slc.process.SlcExecution;
-import org.argeo.slc.runtime.SlcAgent;
import org.argeo.slc.runtime.SlcAgentDescriptor;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
+import org.springframework.jms.JmsException;
import org.springframework.jms.core.JmsTemplate;
+import org.springframework.jms.core.MessagePostProcessor;
/** JMS based implementation of SLC Agent. */
-public class JmsAgent implements SlcAgent, InitializingBean, DisposableBean {
+public class JmsAgent extends DefaultAgent implements InitializingBean,
+ DisposableBean, MessageListener {
+ public final static String PROPERTY_QUERY = "query";
+ public final static String QUERY_PING_ALL = "pingAll";
+
private final static Log log = LogFactory.getLog(JmsAgent.class);
private final SlcAgentDescriptor agentDescriptor;
private Destination agentRegister;
private Destination agentUnregister;
- private String agentDestinationPrefix = "agent.";
- private String agentDestinationBase;
+ private Destination responseDestination;
public JmsAgent() {
try {
}
public void afterPropertiesSet() throws Exception {
- agentDestinationBase = agentDestinationPrefix
- + agentDescriptor.getUuid() + ".";
- jmsTemplate.convertAndSend(agentRegister, agentDescriptor);
- log.info("Agent #" + agentDescriptor.getUuid() + " registered to "
- + agentRegister);
+ try {
+ jmsTemplate.convertAndSend(agentRegister, agentDescriptor);
+ log.info("Agent #" + agentDescriptor.getUuid() + " registered to "
+ + agentRegister);
+ } catch (JmsException e) {
+ log
+ .warn("Could not register agent "
+ + agentDescriptor.getUuid()
+ + " to server: "
+ + e.getMessage()
+ + ". The agent will stay offline but will keep listening for a ping all sent by server.");
+ if (log.isTraceEnabled())
+ log.debug("Original error.", e);
+ }
}
public void destroy() throws Exception {
- jmsTemplate.convertAndSend(agentUnregister, agentDescriptor);
- log.info("Agent #" + agentDescriptor.getUuid() + " unregistered to "
- + agentRegister);
+ try {
+ jmsTemplate.convertAndSend(agentUnregister, agentDescriptor);
+ log.info("Agent #" + agentDescriptor.getUuid()
+ + " unregistered from " + agentUnregister);
+ } catch (JmsException e) {
+ log.warn("Could not unregister agent " + agentDescriptor.getUuid()
+ + ": " + e.getMessage());
+ if (log.isTraceEnabled())
+ log.debug("Original error.", e);
+ }
}
- public String actionDestinationName(String action) {
- return agentDestinationBase + action;
+ public void setAgentRegister(Destination agentRegister) {
+ this.agentRegister = agentRegister;
}
- public void newExecution(SlcExecution slcExecution) {
- log.info("Would execute SlcExecution :" + slcExecution);
+ public void setAgentUnregister(Destination agentUnregister) {
+ this.agentUnregister = agentUnregister;
}
- public void setJmsTemplate(JmsTemplate jmsTemplate) {
- this.jmsTemplate = jmsTemplate;
+ public String getMessageSelector() {
+ String messageSelector = "slc_agentId='" + agentDescriptor.getUuid()
+ + "'";
+ // if (log.isDebugEnabled())
+ // log.debug("Message selector: " + messageSelector);
+ return messageSelector;
}
- public void setAgentRegister(Destination agentRegister) {
- this.agentRegister = agentRegister;
+ public void onMessage(final Message message) {
+ final String query;
+ final String correlationId;
+ try {
+ query = message.getStringProperty(PROPERTY_QUERY);
+ correlationId = message.getJMSCorrelationID();
+ } catch (JMSException e1) {
+ throw new SlcException("Cannot analyze incoming message " + message);
+ }
+
+ final Object response;
+ final Destination destinationSend;
+ if (QUERY_PING_ALL.equals(query)) {
+ ReferenceList refList = (ReferenceList) convertFrom(message);
+ if (!refList.getReferences().contains(agentDescriptor.getUuid())) {
+ response = agentDescriptor;
+ destinationSend = agentRegister;
+ log.info("Agent #" + agentDescriptor.getUuid()
+ + " registering to " + agentRegister
+ + " in reply to a " + QUERY_PING_ALL + " query");
+ } else {
+ return;
+ }
+ } else {
+ response = process(query, message);
+ destinationSend = responseDestination;
+ }
+
+ // Send response
+ if (log.isTraceEnabled())
+ log.trace("About to send response " + response.getClass());
+ jmsTemplate.convertAndSend(destinationSend, response,
+ new MessagePostProcessor() {
+ public Message postProcessMessage(Message messageToSend)
+ throws JMSException {
+ messageToSend.setStringProperty(PROPERTY_QUERY, query);
+ messageToSend.setStringProperty(
+ MsgConstants.PROPERTY_SLC_AGENT_ID,
+ agentDescriptor.getUuid());
+ messageToSend.setJMSCorrelationID(correlationId);
+ return messageToSend;
+ }
+ });
+ if (log.isTraceEnabled())
+ log.debug("Sent response to query '" + query
+ + "' with correlationId " + correlationId);
}
- public void setAgentUnregister(Destination agentUnregister) {
- this.agentUnregister = agentUnregister;
+ /** @return response */
+ public Object process(String query, Message message) {
+ try {
+ if ("getExecutionModuleDescriptor".equals(query)) {
+ String moduleName = message.getStringProperty("moduleName");
+ String version = message.getStringProperty("version");
+ return getExecutionModuleDescriptor(moduleName, version);
+ } else if ("listExecutionModuleDescriptors".equals(query)) {
+
+ List<ExecutionModuleDescriptor> lst = listExecutionModuleDescriptors();
+ SlcAgentDescriptor agentDescriptorToSend = new SlcAgentDescriptor(
+ agentDescriptor);
+ agentDescriptorToSend.setModuleDescriptors(lst);
+ return agentDescriptorToSend;
+ } else if ("runSlcExecution".equals(query)) {
+ final SlcExecution slcExecution = (SlcExecution) convertFrom(message);
+ new Thread() {
+ public void run() {
+ runSlcExecution(slcExecution);
+ }
+ }.start();
+ return ExecutionAnswer.ok("Execution started on agent "
+ + agentDescriptor.getUuid());
+ } else if ("ping".equals(query)) {
+ return ExecutionAnswer.ok("Agent " + agentDescriptor.getUuid()
+ + " is alive.");
+ } else {
+ throw new SlcException("Unsupported query " + query);
+ }
+ } catch (Exception e) {
+ log.error("Processing of query " + query + " failed", e);
+ return ExecutionAnswer.error(e);
+ }
}
- public void setAgentDestinationPrefix(String agentDestinationPrefix) {
- this.agentDestinationPrefix = agentDestinationPrefix;
+ protected Object convertFrom(Message message) {
+ try {
+ return jmsTemplate.getMessageConverter().fromMessage(message);
+ } catch (JMSException e) {
+ throw new SlcException("Cannot convert message", e);
+ }
+ }
+
+ public void setResponseDestination(Destination responseDestination) {
+ this.responseDestination = responseDestination;
+ }
+
+ public void setJmsTemplate(JmsTemplate jmsTemplate) {
+ this.jmsTemplate = jmsTemplate;
}
}
projects / gpl / argeo-slc.git / blobdiff