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As you ve seen in the previous chapter, a client doesn t create an instance of a session bean using the new operator. It gets a reference to a session bean either through dependency injection or JNDI lookup. The container is the one creating the instance and destroying it. This means that neither the client nor the bean is responsible for determining when the bean instance is created, when dependencies are injected, or when the instance is destroyed. The container is responsible for managing the life cycle of the bean. All session beans have two obvious phases in their life cycle: creation and destruction. In addition, stateful session beans go through the passivation and activation phases that I mentioned in the previous chapter.

and are set using the setQueuePriority: method. For operations in a queue the order of execution is determined first by the readiness of the operations followed by their relative priority levels. An operation is ready if all its dependencies have been met. As shown in Figure 1 10 a low priority operation that is ready will run before a high priority operation that is not ready.

If you want to edit a command, use the Backspace key to erase characters, or use the left arrow to navigate to the desired location in the command text. After you have scrolled up through the command stack, use the down arrow to scroll back down through previously viewed commands.

Stateless and singleton beans have in common the fact that they don t maintain conversational state with a dedicated client. Both bean types allow access by any client stateless does

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Note If you re familiar with Windows, scrolling through the command stack is similar to the DOSKEY utility.

Figure 1 10. Execution order of operations is determined first by their readiness then by their relative priorities.

this serially on a per-instance basis, while singleton provides concurrent access to a single instance. Both share the same life cycle shown in Figure 8-1 and described as follows: 1. The life cycle of a stateless or singleton session bean starts when a client requests a reference to the bean (using either dependency injection or JNDI lookup). The container creates a new session bean instance. 2. If the newly created instance uses dependency injection through annotations (@Resource, @EJB, @PersistenceContext, etc.) or deployment descriptors, the container injects all the needed resources. 3. If the instance has a method annotated with @PostContruct, the container invokes it. 4. The bean instance processes the call invoked by the client and stays in ready mode to process future calls. Stateless beans stay in ready mode until the container frees some space in the pool. Singletons stay in ready mode until the container is shut down. 5. The container does not need the instance any more. It invokes the method annotated with @PreDestroy, if any, and ends the life of the bean instance.

Pressing Ctrl+P and Ctrl+N The Ctrl+P keystroke (pressing the Ctrl and P keys at the same time) will display your previously entered command. If you have pressed Ctrl+P several times, you can scroll back down the command stack by pressing Ctrl+N (pressing the Ctrl and N keys at the same time). Listing Command History Use the history command to display commands that have been previously entered by the user: $ history Depending on how many commands have previously been executed, you may see a lengthy stack. You can limit the output to the last n number of commands by providing a number with the command. For example, the following lists the last five commands that have been run: $ history 5 Here is some sample output: 273 274 275 276 277 cd grep -i ora alert.log ssh -Y -l oracle 65.217.177.98 pwd history 5

Depending upon your application needs using an NSInvocationOperation is a viable alternative when the task is already segregated in a method in an existing class of your application. Using an NSInvocationOperation object is the easiest way to define an operation object to be added to an operation queue for execution and eliminates creating custom operation objects. The operation object created by an NSInvocationOperation is a non-concurrent operation. To use an NSInvocationOperation object create and initialize a new instance by passing to the initialization method the target which defines the selector and the parameter object if any. A typical initialization would look like this:

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