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By default, the Entity Framework uses a snapshot-based approach for detecting changes made to POCO entities. If you make some minor code changes to your POCO entities, Entity Framework can create change-tracking proxies that keep the object state manager synchronized with the runtime changes in your POCO entities. There are two important benefits that come with change-tracking proxies. First, the object state manager stays informed of the changes and can keep the entity object graph state information synchronized with your POCO entities. This means that no time needs to be spent detecting changes using the snapshot-based approach. Additionally, when the object state manager is notified of changes on one side of a relationship, it can mirror the change on the other side of the relationship if needed. In Listing 8-8, when we moved a Donation from one Donor to another, Entity Framework also fixed up the Donations collections of both Donors. For the Entity Framework to create the change-tracking proxies for your POCO classes, the following conditions must be met. The class must be public, non-abstract, and non-sealed. The class must implement virtual getters and setters for all properties that are persisted.

You must declare collection-based relationships navigation properties as ICollection<T>. They cannot be a concrete implementation or another interface that derives from ICollection<T>.

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Message Queuing (MSMQ) is Microsoft s messaging solution. Access to queues is exposed in the Framework via types in the System.Messaging namespace. This is one of the two main ways in .NET to leverage MSMQ. The other is to use Enterprise Services, which provides a layer of abstraction on top of queues and their messages by automatically transforming method calls into messages when they re configured as Queued Components (QC) (see 7 for details on Queued Components). There are many tangible benefits to a message queuing infrastructure. Client functionality is not tied to server availability. Since message queuing is done asynchronously from the perspective of the client, if the server is unavailable or under a heavy load, the client is not required to wait for the server to become available before continuing processing. This is very handy for dealing with times of high load on the server. Requests for services are serialized in the message queue, and clients continue to work without waiting for their requests to be processed. You also get guaranteed delivery of your service request. Since the message is persisted to disk when it arrives at the server, even if the server is unavailable, the message will be processed when it comes back online. The downside is that there can be no response returned from the service request. This is intrinsic in the design of any asynchronous messaging infrastructure, and it seriously limits the number of operations that are viable for service requests. In some situations the client/ server paradigm can be flipped around, and the client can have its own queues exposed to receive messages back from the server (see Figure 8-5). We ll show you an example of this later in the chapter.

Figure 5 9. Our new test class The class name follows this pattern: Name of Target Class Being Tested + Test Case Name In this case the Java class being tested is SearchHotelService, and the test case is Get Hotels Test. The test methods themselves are simply the test scenario names, camel-cased into the Java methodnaming convention.

Once your POCO classes have met these requirements, Entity Framework will return instances of the proxies for your POCO classes. If you need to create instances, as we have in Listing 8-8, you need to use the CreateObject<T>() method on the object context. This method creates the instance of the proxy for your POCO entity and initializes all the collections as instances of EntityCollection. It is this initialization of your POCO class collections as instances of EntityCollection that enables fixing up relationships.

Summary

Let s say you are using a model like the one in Figure 8-7 and you working in a disconnected scenario. You want to use GetObjectByKey() to retrieve the original object from the database before you apply changes received from a client. GetObjectByKey() takes an entity key. To form an entity key, you ll need the entity set name, which is not available on POCO classes.

To generate the actual Java code, right-click the UML class and choose Generate Code (see Figure 5 10). Note that if you ticked the Generate Code on result check box shown in Figure 5 7, this step takes place automatically.

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