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Listing 8-10. Using a Map Function to Filter and Sort Data function(doc) { if(doc.type != "contact") return; emit([doc.country, doc.name], {name: doc.name, email: doc.email}); } In the previous map function, you check that the document type is contact, and if it is, you emit a complex key made up of the country and name fields,as well as a value object with name and email fields. You can then use the startkey and endkey URI parameters to define which country you want to look up values for. Now let s compare the results from the SQL query and the map function (see Table 8-1). Table 8-1. Results from SQL Query

invocations across multiple application components. The alternative to JTA is resource-local transactions that are controlled by the application. The type of transactions to be used is defined in the persistence unit whose factory was used when creating the EntityManager instance. An EntityManager whose underlying transactions are JTA is called a JTA EntityManager. The underlying transactions of a container-managed EntityManager instance are always JTA transactions. You will see an example of using an applicationmanaged EntityManager whose underlying transactions are resource-local in the An Example of Using an Application-Managed EntityManager section later in this chapter. Then, the An Example on Persistence Context Propagation section provides an example of using an EntityManager whose persistence context is propagated with the JTA transaction.

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ExtJS (http://extjs.com) is a widget library, but it surpasses all others mentioned here in its elegance and flexibility. It used to go under the name YUI.Ext because it was specifically an add-on to the YUI library (just as Script.aculo.us is for Prototype). However, as the extension neared its 1.0 release, the add-on got reworked to enable ExtJS to work with YUI, jQuery, or Prototype. Now in its 1.1 release, ExtJS includes a stand-alone version, removing the need for other libraries. The documentation for the library even uses its own components, including the Tree and Layout widgets, as seen in Figure 4-5.

The following two sections will touch upon these two types of the container-managed persistence context: transaction-scoped and extended. Transaction-Scoped Persistence Context As mentioned, the lifetime of a container-managed persistence context defaults to the scope of a single transaction. When you inject a container-managed EntityManager into a component, you obtain an EntityManager instance whose persistence context is bound to the JTA transaction. If there is no existing persistent context defined upon the JTA transaction by the time one of the EntityManager s methods is invoked, the persistence provider will create a new persistence context. After the JTA transaction ends, the container closes the EntityManager instance associated with it, detaching all managed entities within the EntityManager s persistence context. As you might guess, this mechanism enables a single persistent context to be shared between more than one application component, as shown in Figure 10-4.

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Figure 10-4. A transaction-scoped persistence context is bound to a single JTA transaction that can be shared between more than one application component. Each application component interacts with the persistence context bound to the JTA transaction through an EntityManager reference injected into that component via the javax.persistence.PersistenceContext annotation. Extended Persistence Context An extended persistence context can be bound only to the scope of a stateful session bean. To achieve this, you have to explicitly set the type element of the PersistenceContext annotation to PersistenceContextType.EXTENDED. An extended persistence context can survive more than one transaction, as depicted in Figure 10-5.

Figure 4-5. ExtJS documentation using ExtJS widgets ExtJS is fantastic for application prototyping because of the ease in which many of the features can be implemented. The file browser style navigation on the left side seen in Figure 4-5 is easily created using a few lines of code: Ext.onReady(function(){ // shorthand var Tree = Ext.tree;

Figure 10-5. An extended persistence context can survive more than one transaction. An extended persistence context bound to a stateful session bean begins when an instance of that stateful bean is created and ends just before the container removes the bean s instance.

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