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The script needs to know which interface is the primary interface prior to entering the main loop. This is so that it will be able to switch interfaces in the correct direction. The commands may need to be validated on your specific operating system. There may also be other values that you ll want to filter out with the egrep command. For instance, on my FreeBSD box, there is a point-to-point interface that I wouldn t want involved, and I d filter it out here. Now we have the list of currently active interfaces on the system. If there is only one interface, we of course assume it to be the primary interface. If there are more interfaces, we loop through all the active ones to find the interface with the specified primary IP address and make it the current interface.

Thirdly, Spring Web Flow enables communication. You will find the core model simple, and the terminology used is readily accessible to nontechnical people. Tools already exist (like the Spring IDE Web Flow editor for Eclipse (http://www.springide.org/project)) that make XML-based flow definitions easily understood, thus bridging the gap between design and implementation. Figure 11-2 shows a screenshot of the Spring Web Flow plugin for Eclipse.

Bean-managed transaction EJBs can set a timeout value for a transaction using the setTransactionTimeout() method from the UserTransaction instance acquired from the EJBContext set in the bean. For example:

Note The actual flow displayed here is a slight variation on the use case we will be implementing later in

if [ $NIC_COUNT -gt 1 ] then for nic in $NICS do current=`ifconfig $nic | grep $IP` if [ "$current" != "" ] then CURRENT_NIC=$nic fi done else CURRENT_NIC=$NICS fi

UserTransaction transaction = ejbContext.getUserTransaction(); transaction.begin(); transaction.setTransactionTimeout( 30 ); //set value to 30 seconds // invoke business functions here transaction.commit();

Because the terminology used within Spring Web Flow is implementation agnostic, flow definitions provide a valuable source of documentation that is understandable by all parties involved in the development process, and best of all, it is never out of date.

If the initial active primary interface is the specified SECONDARY interface, you have to reverse the variables so the script won t switch interfaces in the wrong direction.

The timeout value for container-managed transaction beans comes from the EJB container itself. Your vendor s documentation should explain how to set this value.

Drawing from its roots within the Spring community, Spring Web Flow adheres to established best practices: Develop against interfaces to allow you to plug in the most appropriate implementation. A fine-grained life cycle event listener infrastructure provides further customization points. Favor integration with established technologies over reinventing the wheel. Spring Web Flow ties into much of the same foundational infrastructure Spring MVC does. This includes Spring s BeanFactory for configuration, Spring s Data Binder and Validator concepts, and Spring MVC s DispatcherServlet and View resolution subsystems. Allow reusablility from within other established web frameworks, to provide a choice in product configuration. As an embeddable page flow engine, Spring Web Flow integrates out of the box with Struts, JavaServer Faces (JSF), and Portlet MVC environments. Facilitate test-driven development (TDD) by removing coupling between components, collaborators, and the deployment environment. Flow executions are easy to test both in isolation and as part of an end-to-end integration test.

This starts the main loop for checking the network s availability. It starts by sleeping for the configured amount of time and then initializes the variable for the ping response.

As you can see from the recipe, setting timeout values for transactions is simple. When a timeout occurs, the transaction will be rolled back because a SystemException will be thrown. An EJB can receive notification of the rollback by implementing the SessionSynchronization interface for session beans only. If an EJB client has a reference to the transaction, it can test the transaction using the getRollbackOnly() method from the UserTransaction instance.

Listing 8-34 shows a textual representation of the DOM that we built up in the preceding method, assuming two special deals had been returned for our home page. Listing 8-34. The Raw XML Prior to Transformation < xml version="1.0" encoding="UTF-8" > <specials> <deal> <from>London</from> <to>New York</from> <cost>300</cost> </deal> <deal> <from>Paris</from>

while : do sleep $SLEEPTIME answer=""

5.2 Handling transaction management without the container 5.5 Forcing rollbacks before method completion 5.8 Managing EJB state at transaction boundaries 5.10 Managing EJB state after a rollback

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