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To selectively deliver messages to a message-driven bean, the bean should be deployed with a message selector. The bean source needs no changes in order to use the message selector. Listing 6.19 shows a simple message-driven bean that only wants messages that contain an attribute UserRole set to "BuyerRole". The bean prints out the role of the incoming message for verification.

It stores snapshots of FlowExecutions that represent a stateful user conversation in an in-memory map. Each map entry key is a conversationId, uniquely identifying a single ongoing conversation between a client and the Spring Web Flow system. Each map entry value is an org.springframework.webflow.execution.repository.continuation.Conversation object, providing the details about one ongoing logical conversation. Each Conversation object maintains a stack of org.springframework.webflow.execution.repository.continuation. FlowExecutionContinuations, each continuation representing a restorable state of a conversation at a point in time. These continuations allow users to go back in their browser successfully to continue a conversation from a previous point.

This produces the following output:

public class MessageBean implements MessageDrivenBean, MessageListener { private MessageDrivenContext ctx; public void onMessage(Message msg) { MapMessage map=(MapMessage)msg; try { String role = map.getString( "UserRole" );

This is a trivial implementation that stores single instances of FlowExecutions in an in-memory map with a much simpler structure than the ContinuationFlowExecutionRepository. It requires minimal resource requirements, designed to be used when supporting browser navigation button use is not necessary (as is the case for many intranet applications that lock down the browser). In this repository, each map entry key is a conversationId and each map entry value is a FlowExecutionEntry object. The FlowExecutionEntry (which is internal to SimpleFlowExecutionRepository) consists of the FlowExecution and a unique continuationId that acts as a token required for accessing the conversation. Because the continuationId is changed after every transition, Back button use and duplicate form submission are not supported and will result in a NoSuchConversationContinuationException being thrown consistently each time.

The -v switch is a relatively new option for assigning a variable, and it may not be ideal when you re shooting for portability. In that case, this usage should do the trick:

System.out.println("Received Message for Role: " + role); ProcessTheMessage( message ); } catch(Exception ex) { ex.printStackTrace(); } } }

Stateless repositories do not maintain any internal state, but instead rely on conversational state to be stored externally for example, in the database or in a serialized structure sent from the client. Currently there exists one stateless implementation, org.springframework. webflow.execution.repository.continuation.ClientContinuationFlowExecutionRepository.

It produces the following output:

In the XML descriptor for the bean, you describe the message selector that filters undesired messages for the message-driven bean. Listing 6.20 shows the partial XML descriptor that describes the simple EJB and its message selector.

This repository implementation encodes the state of the FlowExecutionContinuation into the continuationId, which is written out to the browser in the _flowExecutionId parameter. On a subsequent request, that encoded FlowExecutionContinuation is deserialized and resumed. This implementation requires no server-side state whatsoever, but still reaps all the benefits of continuations, including proper browser navigational behavior.

<ejb-jar> <enterprise-beans> <message-driven> <ejb-name>MDB</ejb-name> <ejb-class>messageSelector.MessageBean</ejb-class> <transaction-type>Container</transaction-type> <message-selector> Specifies a <![CDATA[ UserRole = 'BuyerRole' ]]> message </message-selector> selector <message-driven-destination> <destination-type>javax.jms.Topic</destination-type> </message-driven-destination> </message-driven> </enterprise-beans> <ejb-jar>

Here is another use of shell variables with the awk command. The NODE=$node assignment sets the internal awk variable NODE to the value of the shell variable $node. The awk command then checks whether each line of the input file for $2 is equal to the value of NODE. If a line is equal, then $3 is output. In this example, the /etc/hosts file was used. The code works like that in the Simple Pattern-Matching example shown earlier, except that the value to compare against can be specified independently of the field that is output.

There are trade-offs to consider when evaluating this strategy: If the flowExecution is large then it becomes more expensive to send to the client and back on every request. You may be limited to POSTs only. There is a security risk when storing all the information on the client. This risk is mitigated by encrypting the _flowExecutionId, but not entirely, and therefore needs to be considered. There is no way to track conversation invalidation after completion (for example, when a continuation reaches an end state). It is possible to go back after completing a flow and resubmit, completing a single logical application transaction more than once. Supporting conversation completion detection properly likely involves combining a client-based continuation strategy with some form of centralized storage, like a database-backed conversation table.

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