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We ve been talking about EntityManager flushing on and off throughout the chapter. It is time we discussed this concept fully. For the most part, you ll probably be able to get away without knowing too much about this EntityManager feature. However, there are some situations where not understanding EntityManager flushing could be a great disadvantage. Recall that EntityManager operations like persist, merge, and remove do not cause immediate database changes. Instead, these operations are postponed until the EntityManager is flushed. The true motivation for doing things this way is performance optimization. Batching SQL as much as possible instead of flooding the database with a bunch of frivolous requests saves a lot of communication overhead and avoids unnecessarily tying down the database. By default, the database flush mode is set to AUTO. This means that the EntityManager performs a flush operation automatically as needed. In general, this occurs at the end of a transaction for transaction-scoped EntityManagers and when the persistence context is closed for application-managed or extendedscope EntityManagers. In addition, if entities with pending changes are used in a

Implementing a SOAP Message Receiver class StockTrader { public void SendSoapMessage(SoapEnvelope message) { // Register the response receiver SoapReceiversAdd(fromUri, typeof(StockTraderResponseReceiver)); // Send the SOAP request message SoapSender soapSender = new SoapSender(toUri); soapSenderSend(message); } }.

query, the persistence provider will flush changes to the database before executing the query. You can set the flush mode to COMMIT if you don t like the idea of autoflushing and want greater control over database synchronization. You can do so using the EntityManager s setFlushMode method as follows:

entityManager.setFlushMode(FlushModeType.COMMIT);

If the flush mode is set to COMMIT, the persistence provider will only synchronize with the database when the transaction commits. However, you should be careful with this, as it will be your responsibility to synchronize entity state with the database before executing a query. If you don t do this and an EntityManager query returns stale entities from the database, the application can wind up in an inconsistent state. In reality, resetting flush mode is often overkill. This is because you can explicitly flush the EntityManager when you need to, using the flush method as follows:

This chapter has introduced some of the salient features of C++/CLI. Using C++/CLI, you can combine the good old world of native C++ and the fancy new world of .NET. As you ve seen, you can integrate managed code into existing C++ code and also link native and managed inputs into a single output file. Furthermore, you can seamlessly call between managed and unmanaged code. These features are extremely useful, both for extending existing applications and libraries with .NET features and for writing new .NET applications and libraries that require a lot of interoperability between managed and unmanaged code.

entityManager.flush();

public class StockTraderResponseReceiver : SoapReceiver { protected override void Receive( SoapEnvelope message ) { // Process the incoming message... } } The code in Listing 8-6 is implemented in the sender component to process incoming response messages. It turns out that the receiver component implements very similar code but, this time, to process incoming request messages. This is the important point: the SoapReceiver class does not care whether it is implemented in a sender or a receiver component. It is agnostic in this regard. Its purpose is to support the processing of incoming SOAP messages, regardless of whether they originate from a sender or a receiver component. Listing 8-7 shows you how to process an incoming message. This listing is taken from the receiver component, which processes the RequestQuote SOAP request message. The receiver needs to do the following: 1. Deserialize the SOAP message body. 2. Examine the SOAP message Action to determine how to process the incoming SOAP message. The SoapReceiver must be able to correlate the incoming message body to a qualified data type, in this case, the StockTrader Quote type. 3. Process the RequestQuote operation. 4. Generate a response message based on the Quote type, which is the output type from the StockTrader s RequestQuote operation. Inherent in this step is the fact that the SoapReceiver must correlate this outgoing response message with the incoming SOAP request message. 5. Send the response message back to the sender.

The EntityManager synchronizes the state of every managed entity with the database as soon as this method is invoked. Like everything else, manual flushing should be used in moderation and only when needed. In general, batching database synchronization requests is a good optimization strategy to try to preserve. We ll now move on to the last persistence operation to be discussed in this chapter: refreshing entities.