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Message-driven bean instance pools are created in a vendor-specific manner. Listing 6.18 shows how this is accomplished using the Weblogic application server. Notice the vendor XML creates a pool maximum size of five beans, with an initial size of two beans.

We can use NF to get the second-to-last field of the string, as in the next example. This could be easily modified to reference other positions in the input relative to the last field. The previous three examples all relate directly to the standard numeric awk field variables. From our example string, $NF would be equal to $9. This variable is one layer more abstract than directly referencing a positional variable. It allows you to reference any particular field of an arbitrary string length through logic.

As discussed, Spring Web Flow represents an execution of a flow in the FlowExecution object, and a FlowExecution is loaded and saved from a repository while a logical conversation remains active between requests. In a continuation-based repository, each conversation snapshot is captured by an org.springframework.webflow.execution.repository. continuation.FlowExecutionContinuation which represents a FlowExecution at a single point in time. An org.springframework.webflow.execution.repository.continuation. FlowExecutionContinuation is identified by a unique org.springframework.webflow. execution.repository.FlowExecutionContinuationKey, which consists of two logical parts, defined in Table 12-6. Table 12-6. The Parts of a FlowExecutionContinuationKey

<weblogic-ejb-jar> <weblogic-enterprise-bean> Sets up the message<ejb-name>concurrentMDB</ejb-name> driven bean pool <message-driven-descriptor> <pool> <max-beans-in-free-pool>5</max-beans-in-free-pool> <initial-beans-in-free-pool>2</initial-beans-in-free-pool> </pool> <destination-jndi-name>BookJMSQueue</destination-jndi-name> </message-driven-descriptor> <jndi-name>concurrent.MBD</jndi-name> </weblogic-enterprise-bean> </weblogic-ejb-jar>

echo $VAR | awk '{print $(NF-1)}'

A unique id that identifies a logical conversation or dialog between a user and the server. This id remains the same for the duration of the logical conversation. A pointer to a single instance of a FlowExecutionContinuation associated with a logical conversation.

Using a bean pool is a quick and dirty way to achieve concurrent processing of messages. The pool, combined with a message queue, provides a way to process many messages at once without duplicating messages across instances. Creating an environment like this allows messages to start processing instead of waiting for previous messages to complete. You should use this type of processing only when

You get the following output:

Recall that in 11 the unique key submitted by the view back to the server to participate in an ongoing conversation was called the _flowExecutionId by default. This is a String-encoded representation of the previously mentioned FlowExecutionContinuationKey and consists of two delimited parts. The first part identifies the active, logical conversation (in a repository), and the second part identifies the continuation (or restorable snapshot) to restore. The_flowExecutionId that is submitted by a view is parsed into a FlowExecutionContinuationKey object, which is then used to load the correct FlowExecution from the repository. Spring Web Flow provides a number of stateful implementations of FlowExecutionRepository and a single, stateless, client-side implementation, as described in the following sections.

concurrent processing of messages will not cause problems in your business logic or invalid states in your data.

In some cases you may not know until the command is run which field you want. You can deal with this by passing a value to awk when it is invoked. The following example shows how you can pass the value of the shell variable TheCount to an awk command. The -v switch to awk specifies that you are going to set a variable. Following the -v switch is the variable being assigned within awk.

Stateful repositories manage their own state and are typically stored in server-side data structures such as the HTTP session. Two implementations exist: org.springframework.webflow. execution.repository.continuation.ContinuationFlowExecutionRepository and org.springframework.webflow.execution.repository.SimpleFlowExecutionRepository.

Message-driven beans that subscribe to a topic or receive messages from a queue should be able to handle messages of the wrong type (which should not invoke the message-driven business logic). Beans should just politely discard these messages when they are encountered. This is especially true for message-driven beans that exist in an environment with many different beans that watch a single source for incoming messages. However, it would be more efficient to avoid the execution time used for discarding messages and instead avoid receiving unwanted messages.

TheCount=3 echo $VAR | awk -v counter=$TheCount '{print $counter}'

This implementation provides a stateful server-side solution that supports browser navigational button use.

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