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6: Legacy Connectivity
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Typically, you want the application server to notify you about the status of submitted work that is in a partial state of execution. To accomplish the same in JCA 1.5, you create an object that implements the javax.resource.spi.WorkListener interface. You can then register this object using the startWork() method of the WorkManager object on the application server. The WorkManager interface facilitates the submission of Work instances for execution. Registering the object allows the server to notify the resource adapter if the work was rejected or accepted, and if accepted, when the work was started and completed. You can also extend the WorkAdapter class, which implements the WorkListener interface and provides empty methods for each of these. Here is skeleton code for a class that implements WorkListener:
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public class UcnyWorkListenerImpl implements WorkListener {
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This listener is used to provide notification back to the originator of a piece of work once it has completed, or to reschedule an item of work when it fails.
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public void workAccepted(WorkEvent e) { // // } System.out.println("Work instance " + e + " has been accepted.");
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public void workRejected(WorkEvent e) { // // } System.out.println("Work instance " + e + " has been rejected.");
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public void workStarted(WorkEvent e) { // // } System.out.println("Work instance " + e + " has been started.");
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public void workCompleted(WorkEvent e) { // // } System.out.println("Work instance " + e + " has been completed.");
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Here is an implementation of the ResourceAdapter interface that illustrates the JCA 1.5 life cycle management and work management contracts:
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public class UcnyResourceAdapterImpl implements ResourceAdapter {
// Lifecycle Contract methods from earlier omitted.
public XAResource[] getXAResources(ActivationSpec[] specs) throws ResourceException { // return XAResource objects that correspond to ActivationSpecs passed
return null; }
public void endpointActivation(MessageEndpointFactory mef, ActivationSpec as) throws NotSupportedException {
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public void endpointDeactivation(MessageEndpointFactory mef, ActivationSpec as) { }
The ActivationSpec class that is passed in to the ResourceAdapter methods is a JavaBean that implements a number of get and set methods for various properties. In addition to providing these get and set methods, an implementation must also provide a validate() method to ensure that all of the properties have been legally set. If a property has not been set properly, the method must throw an InvalidProp ertyException. Note that an ActivationSpec object cannot override equals().
public class MyActivationSpec implements ActivationSpec, Serializable {
public void setMyProperty(MyProperty s) { } public MyProperty getMyProperty() { }
public void validate() throws InvalidPropertyException { }
In version 1.0 of the J2EE Connector Architecture, a resource adapter could only pass transaction information to the EIS, either from itself or from an external transaction manager. However with the Transaction Inflow contract in version 1.5 of the architecture, the resource adapter can pass EIS transaction requests to the application server as well as use the BootstrapContext object that is passed in with the start() method of the Life Cycle Contract. The BootStrapContext interface was mentioned briefly in the discussion of the Life Cycle Management contract. Here are the methods in the BootstrapContext interface:
public class UcnyBootstrapContextImpl implements BootstrapContext {
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public WorkManager getWorkManager() { // Get the work manager from the application server }
public XATerminator getXATerminator() { return new UcnyXATerminatorImpl(); }
public Timer createTimer() { return new Timer(); } }
Let s look at the XATerminator interface. Notice that it s the return type of the
getXATerminator() method in the BootStrapContext interface. The XATerminator
interface contains five simple methods that handle transactions:
public class UcnyXATerminatorImpl implements XATerminator {
public void commit(Xid xid, boolean onePhase) throws XAException { } public void forget(Xid xid) throws XAException { } public int prepare(Xid xid) throws XAException { } public Xid[] recover(int flag) throws XAException { } public void rollback(Xid xid) throws XAException { }
6: Legacy Connectivity
Build the RAR File
The next step is to build the ucnyjca.rar file. Typically, you would have a source directory containing two subdirectories: ucnyjca containing the .java files, and META-INF containing the configuration files. See the JCA 1.5 connector specification located at http://java.sun.com/j2ee/connector/download.html for information on resource adapter deployment descriptors. The deployment descriptors, the ra.xml file needs to be in the WEB-INF directory of the WAR file. The resource adapter descriptor file, ra.xml, is fairly easy to create. You simply need to point in the file to the class that implements the ResourceAdapter interface. The application server will then access that class.
< xml version="1.0" encoding="UTF-8" > <connector xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/connector_1_5.xsd" version="1.5">
<display-name>UCNY Resource Adapter</display-name> <vendor-name>UCNY, Inc.</vendor-name> <eis-type>Unknown</eis-type> <resourceadapter-version>1.0</resourceadapter-version>
<resourceadapter> <resourceadapter-class> com.Ucny.ra.UcnyResourceAdapterImpl </resourceadapter-class> </resourceadapter>
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