Page History

jbi

jbi is the "id" of the JBI container and provides the basic infrastructure services for myComponent. During initialization, several singletons are instantiated: transactionManager, broker, jmsFactory, and jbi. Also, take note of the properties installationDirPath and deploymentDirPath defined in servicemix.xml. ServiceMix automatically installs components found in the folder specified in the installationDirPath property. It automatically deploys component-specific artifacts found in the folder specified in the deploymentDirPath property.

JMSClient

This Java standalone program, through the ActiveMQConnectionFactory, connects to topic "demo.org.servicemix.source." It then creates a text message from the file message.soap and publishes it to the topic "demo.org.servicemix.source," then requests and waits for a response. It eventually prints the response to the console.

myComponent

This JMS service component subscribes to the "demo.org.servicemix.source" topic via its defaultDestinationName property specified in the servicemix.xml configuration file. Through its template property, it uses jmsFactory to listen on port 61616 via ActiveMQConnectionFactory. It is implemented by the JmsServiceComponent that has an onMessage() method which is called by ActiveMQ when a message arrives on the topic. This method creates a normalized message, which is sent over the ServiceMix bus to the PxeBpelEngine as specified on its destinationService property.

jndi

This bean loads up database and transaction manager resources, which will be used by the other components in the system. More importantly, the JNDI context must be configured so that PXE can be deployed.

Pxe-install.jar

This jarfile is located in the examples\bpel\install directory. It contains many files, which in turn contain the classes that implement the PXE BPEL engine. It also has a jbi.xml file, which is used by ServiceMix to install the PXE BPEL engine as a ServiceMix service-engine component. Note, that in this file the component type is "service-engine" and the component name is PxeBpelEngine. When processes are deployed to the PXE engine (see next row with AsyncProcess-sa.jar), it exposes them as services on the JBI, which can be referenced by other components as destinationService(s), with destinationEnpoint(s) - see the servicemix.xml file.

AsyncProcess-sa.jar

This jarfile is located in the examples\bpel\deploy directory. It contains a jbi.xml file, which references the PxeBpelEngine. This ties the processes to the PXE engine described in the previous section. The jbi.xml file also references the AsyncProcess-su.zip file, which is also contained in the AsycnProcess-sa.jar file. This zipfile contains other configuration files and WSDL files, i.e., pxe-system.xml and resource_X.stream, which describe the services deployed on the PXE engine.

broker

The broker bean uses the activemq.xml file to configure the message broker, which handles the JMS messages for the components that require JMS messaging services.

transactionManager

This bean is configured to be the default transaction manager for the jbi container. This transaction manager provides transactional services between the resource adapter (in this case the ActiveMQ resource adapter provided by the jencks JCA container) and components in the jbi container.

_checkAvailability _

This component uses the WSIFBinding class to integrate WSIF to service mix as specified in the class property. Its definitionResource property is set to read the file classpath:org/servicemix/components/wsif/service.wsdl, which defines the WSDL file that will be used. This file can be found at servicemix_src_install_dir\src\test\resources\org\servicemix\components\wsif

MDB

This message driven bean is the actual implementation of the service. It acts like a message listener on the queue specified on the config files. When a message is delivered, it extracts the body which is presumably a valid zip code, so the bean makes it an integer in an unsafe and intrepid manner. It then applies some logic to determine whether DSL service is available at this zip code or not. For simplicity, it just returns true for all zip codes < 50000, and false otherwise. The return message is sent to the queue specified in the replyTo field of the request message. Note that the bean must encode the correct JMSCorrelationID in the return message in order for it to be picked up by WSIF

jmsFactory

This bean listens on port 61616 and provides a pooled ActiveMQ connection.