SCA Java binding.jms (TUSCANY) edited by ant
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h3. <binding.jms>
The Tuscany Java SCA runtime supports the Java Messaging Service using the
<binding.jms> SCDL extension. New JMS based service endpoints can be provided
using a <binding.jms> element within a SCA <service>, existing JMS queues can
be accessed using a <binding.jms> element within a SCA <reference>.
The JMS binding is one of the SCA extensions which is being formalized in the
OASIS Open Composite Services Architecture with a published [specifications
|http://www.oasis-opencsa.org/sca-bindings] document.
h4. Using the JMS binding
The simplest way to use the JMS binding is to use the URI syntax to configure
the binding, for example:
{code}<binding.jms uri="jms:RequestQueue"/>{code}
This tells the binding to use a JMS destination named "RequestQueue", with all
the other configuration options using default values.
By default Tuscany will use a JMS connection factory named 'ConnectionFactory',
this can be changed by using a query parameter in the URI, for example, to use
a connection factory named 'myCF' can be done as follows:
{code}<binding.jms uri="jms:RequestQueue?connectionFactoryName=myCF"/>{code}
When used in a SCA reference for RPC style requests and no response destination
is defined in the SCDL then a temporary replyTo queue will be used.
h3. Some examples:
h4. HelloWorld
The helloworld-jms sample demonstrates basic RPC style operations over JMS. The
sample has one component exposing a JMS service on a queue name 'RequestQueue'
and another component which invokes the service by sending JMS messages to that
queue. The .composite file for this is shown below, see the sample README for
full details.
{code}
<composite xmlns="http://www.osoa.org/xmlns/sca/1.0";
targetNamespace="http://sample";
xmlns:sample="http://sample";
name="HelloWorld">
<component name="HelloWorldClient">
<implementation.java class="helloworld.HelloWorldClient"/>
<reference name="helloWorldService">
<interface.java interface="helloworld.HelloWorldService"/>
<binding.jms uri="jms:RequestQueue"/>
</reference>
</component>
<component name="HelloWorldServiceComponent">
<implementation.java class="helloworld.HelloWorldServiceImpl" />
<service name="HelloWorldService">
<interface.java interface="helloworld.HelloWorldService"/>
<binding.jms uri="jms:RequestQueue"/>
</service>
</component>
</composite>
{code}
h3. Configuring JMS resources
Tuscany locates all JMS resources from JNDI so the environment where Tuscany is
running needs to have JNDI and JMS correctly configured in order to use the
Tuscany JMS binding.
All JNDI lookups are first tried in the java:comp/env namespace so when running
Tuscany in a JEE environment resource aliases may be used to map Tuscany JMS
resources to actual resources.
The following describes how to configure JMS in some common environments:
h4. Tuscany J2SE standalone environment
h4. Apache Tomcat
h4. JEE application servers such as Apache Geronimo, WebSphere etc
h4. Using an external JMS broker
When the Tuscany environment does not include a JMS broker then an external
broker may be used by specifying the initialContextFactory and jndiURL
attributes on the binding.jms element. Any JMS 1.1 compatible broker should
work such as Apache ActiveMQ or any other proprietary broker. The Tuscany
application classpath will need to include jars for the initial context factory
and all of its dependencies.
An example of using the Tuscany JMS binding with an external ActiveMQ broker is
as follows:
{code}
<binding.jms
initialContextFactory="org.apache.activemq.jndi.ActiveMQInitialContextFactory"
jndiURL="tcp://localhost:61616">
<destination name="DestQueueA"/>
</binding.jms>
{code}
h3. JMS binding schema
The complete JMS binding SCDL schema has the following format:
{code}
<binding.jms correlationScheme="string"?
initialContextFactory="xs:anyURI"?
jndiURL="xs:anyURI"?
requestConnection="QName"?
responseConnection="QName"?
operationProperties="QName"?
... >
<destination name="xs:anyURI" type="string"? create="string"?>
<property name="NMTOKEN" type="NMTOKEN">*
</destination>?
<connectionFactory name="xs:anyURI" create="string"?>
<property name="NMTOKEN" type="NMTOKEN">*
</connectionFactory>?
<activationSpec name="xs:anyURI" create="string"?>
<property name="NMTOKEN" type="NMTOKEN">*
</activationSpec>?
<response>
<destination name="xs:anyURI" type="string"? create="string"?>
<property name="NMTOKEN" type="NMTOKEN">*
</destination>?
<connectionFactory name="xs:anyURI" create="string"?>
<property name="NMTOKEN" type="NMTOKEN">*
</connectionFactory>?
<activationSpec name="xs:anyURI" create="string"?>
<property name="NMTOKEN" type="NMTOKEN">*
</activationSpec>?
</response>?
<resourceAdapter name="NMTOKEN">?
<property name="NMTOKEN" type="NMTOKEN">*
</resourceAdapter>?
<headers JMSType="string"?
JMSCorrelationId="string"?
JMSDeliveryMode="string"?
JMSTimeToLive="int"?
JMSPriority="string"?>
<property name="NMTOKEN" type="NMTOKEN">*
</headers>?
<operationProperties name="string" nativeOperation="string"?>
<property name="NMTOKEN" type="NMTOKEN">*
<headers JMSType="string"?
JMSCorrelationId="string"?
JMSDeliveryMode="string"?
JMSTimeToLive="int"?
JMSPriority="string"?>
<property name="NMTOKEN" type="NMTOKEN">*
</headers>?
</operationProperties>*
</binding.jms>
{code}
(?) See the [JMS Binding Specification
1.0|http://www.osoa.org/download/attachments/35/SCA_JMSBinding_V100.pdf?version=2]
for full details of each of these configuration options.
(!) Not all these elements are supported by Tuscany. Specifically, the
<activationSpec> and <resourceAdapter> elements are not supported as Tuscany
does not use JCA or MDBs for its JMS support. Additionally, support for the
requestConnection, responseConnection, and operationProperties attributes has
not yet been implemented but this should get done shortly.
(!) The create attribute on the destination element is not supported in most
environments and all JMS resources (connection factories, queues and topics)
need to be pre-configured. An exception to this is when using Apache ActiveMQ
as the JMS broker Tuscany may be able to dynamically create queue and topic
resources. This is mainly only useful for unit testing and it is recommended
that user applications are designed with the expectation that JMS resources
need to be preconfigured.
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