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The configuration for an entity manager is templated from the EntityManagerFactory that created it, but it is defined separately as a persistence unit A persistence unit dictates either implicitly or explicitly the settings and entity classes used by all entity managers obtained from the unique EntityManagerFactory instance bound to that persistence unit There is, therefore, a one-to-one correspondence between a persistence unit and its concrete EntityManagerFactory Persistence units are named to allow differentiation of one EntityManagerFactory from another This gives the application control over which configuration or persistence unit is to be used for operating on a particular entity..

Figure 2-1. Relationships between JPA concepts Figure 2-1 shows that for each persistence unit there is an EntityManagerFactory and that many entity managers can be created from a single EntityManagerFactory. The part that may come as a surprise is that many entity managers can point to the same persistence context. We have talked only about an entity manager and its persistence context, but later on we will see that there may in fact be multiple references to different entity managers all pointing to the same group of managed entities. This will enable the control flow to traverse container components but continue to be able access the same persistence context.

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You can use log handlers to process and forward log messages to other entities. At the time of writing this book, only the Record Management System (RMS) handler is available. So, currently, you could use the RMS log handler to store all log entries, and then view them later with the LogViewerMidlet. You can activate the desired log handlers by using the <handler> element in your build.xml file. Listing 9-6 activates the RMS log handler for all Siemens devices. Listing 9-6. Activating the RMS Log Handler for Siemens Devices <debug level="warn" unless="test"> <handler name="rms" if="polish.Vendor == Siemens" /> <filter package="com.apress.application" level="debug" /> </debug> The RMS log handler saves all log entries in the RMS, so that you can view them with the de.enough.polish.log.rms.LogViewerMidlet. You can find this MIDlet in ${polish.home}/ samples/logviewer. When you build it, make sure to set the following preprocessing variables in the <variables> section of the log viewer s ${polish.home}/samples/logviewer/build.xml script: polish.log.MIDletSuite (corresponding to the name attribute in your <info> element) polish.log.Vendor (as in the vendorName attribute in your <info> section) Without these variables, the log viewer will not be able to find the shared record store that contains the log messages. After you have defined the necessary variables, you can then build the log viewer and install it on your device. Figure 9-2 shows the log viewer in action. You can filter the shown messages by typing in keywords.

The way the constructors and methods are described is as follows: Map(mapDiv:Node, opts :MapOptions) First you see the name of the method and then within the parentheses is its arguments. The arguments are described as follows: variableName:variableType Before the colon is a descriptive variable name, and after the colon is the type of the variable. If there s a question mark after the variable name, it means that it s an optional argument.

An entity manager is always obtained from an EntityManagerFactory. The factory from which it was obtained determines the configuration parameters that govern its operation. While there are shortcuts that veil the factory from the user view when running in a Java EE application server environment, in the Java SE environment we can use a simple bootstrap class called Persistence. The static createEntityManagerFactory() method in the Persistence class returns the EntityManagerFactory for the specified persistence unit name. The following example demonstrates creating an EntityManagerFactory for the persistence unit named EmployeeService : EntityManagerFactory emf = Persistence.createEntityManagerFactory("EmployeeService"); The name of the specified persistence unit EmployeeService passed into the createEntityManagerFactory() method identifies the given persistence unit configuration that determines such things as the connection parameters that entity managers generated from this factory will use when connecting to the database.

Summary

The AbstractQuery interface provides the subquery() method for creation of subqueries. Subqueries may be correlated (meaning that they reference a root, path, or join from the parent query) or non-correlated. The criteria API supports both correlated and non-correlated subqueries, again using query roots to tie the various clauses and expressions together. The argument to subquery() is a class instance representing the result type of the subquery. The return value is an instance of Subquery, which is itself an extension of AbstractQuery. With the exception of restricted methods for constructing clauses, the Subquery instance is a complete query definition like CriteriaQuery that may be used to create both simple and complex queries.

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