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messaging. Among other things, this tends to promote loose coupling between systems. In our example, the Turtle server would know about the format of the XML message and not the ShippingRequest object itself. The problem is that XML tends to bloat the size of the message, significantly degrading MOM performance. In certain circumstances, it might even be the right choice to use binary streams in the message payload, which puts the least amount of demand on MOM processing as well as memory consumption. Be wary of poison messages. Imagine that a message is handed to you that your MDB was not able to consume. Using our example, let s assume that we receive a message that s not an ObjectMessage. As you can see from this code snippet, if this happens the cast in onMessage will throw a java.lang.ClassCastException:

try { ObjectMessage objectMessage = (ObjectMessage)message; ShippingRequest shippingRequest = (ShippingRequest)objectMessage.getObject(); processShippingRequest(shippingRequest); } catch (JMSException jmse) { jmse.printStackTrace(); context.setRollBackOnly(); }

Since onMessage will not complete normally, the container will be forced to roll back the transaction and put the message back on the queue instead of acknowledging it (in fact, since a runtime exception is thrown, the bean instance will be removed from the pool). The problem is, since we are still listening on the queue, the same message will be delivered to us again and we will be stuck in the accept/ die loop indefinitely! Messages that cause this all-too-common scenario are called poison messages. The good news is that many MOMs and EJB containers provide mechanisms that deal with poison messages, including redelivery counts and dead message queues. If you set up the redelivery count and dead message queue for the shipping request destination, the message delivery will be attempted for the specified number of times. After the redelivery count is exceeded, the message will be moved to a specially designated queue for poison messages called the dead message queue. The bad news is that these mechanisms are not standardized and are vendor specific. Configure MDB pool size. Most EJB containers let you specify the maximum number of instances of a particular MDB the container can create. In effect, this controls the level of concurrency. If there are five concurrent messages to process and the pool size is set to three, the container will wait until the first three

Therefore, you have to create a native class that derives from NativeLib::CryptoAlgorithm and overrides the virtual functions: class CryptoAlgorithmProxy : public NativeLib::CryptoAlgorithm { public: virtual void Encrypt( const unsigned char* pData, int nNumInBytes, unsigned char* pBuffer, int nBufferLen, int& nNumOutBytes); virtual void Decrypt( const unsigned char* pData, int nNumInBytes, unsigned char* pBuffer, int nBufferLen, int& nNumOutBytes); // rest of this class discussed later }; I call this class CryptoAlgorithmProxy because it acts as a proxy for the managed wrapper class that provides the actual implementation of Encrypt and Decrypt Its virtual functions must be implemented so that the equivalent virtual functions of ManagedWrapper::CryptoAlgorithm are called For these functions to be called, CryptoAlgorithmProxy needs a tracking handle to the.

The diagram in Figure 7-2 shows a client that requests a security token and then uses it to communicate with two services You can notice that the client only needs to request the token once during this session, which helps reduce the transaction time Another important aspect of the diagram is that two services are using the same authentication broker This is one of the main advantages of this model, because it provides a centralized authentication authority and it allows for easier management of the identity store..

Summary

messages are processed before assigning any more instances. This is a doubleedged sword and requires careful handling. If you set your MDB pool size too small, messages will be processed slowly. At the same time, it is desirable to place reasonable limits on the MDB pool size so that many concurrent MDB instances do not choke the machine. Unfortunately, at the time of this writing, setting MDB pool sizes is not standardized and is provider specific.

4.5 Summary