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Each cache implementation shares a common set of tags for flushing their contents. When thinking through your caching, determine how and when you want objects to be removed from the cache. By default, each cache model type has a means of managing the cached data on a granular level. They can remove individual objects based on memory, recent access, or age. Beyond each cache model s inherent behavior you can further give them instruction on when to the flush their entire contents. The flush tags are made available to provide such functionality. There are two flush tags, as shown in table 9.4.

// Load requested Item Item item = (Item) session.load(Item.class, itemId, LockMode.UPGRADE); // Check auction still valid if ( item.getEndDate().before( new Date() ) ) { ... // Forward to error page } // Check amount of Bid Query q =

Open/create the record store and store string records Create an instance of the record comparator Get the records from the record store Use the comparator to compare the two records retrieved While the comparator may be useful by itself in comparing records in a record store, it becomes an even more powerful tool when combined with a record filter and record enumeration as described in the next section. Objects that implement these three RMS interfaces can be utilized on a record store to intelligently access and work on specific data in a record store.

Integer count = (Integer) session.find("select count(distinct e) from "+ "Event e").get(0);

In the previous section, we reviewed each step in building and preparing to test our application. Due to the rather tedious nature of executing each of these steps, you likely want to utilize command-line tools when building C applications, as it greatly speeds up the edit, compile, copy, debug cycle. This example with only a single C source file is rather simplistic; when multiple source files must be linked together, the thought of having a build script is appealing. The need for a build script (shown in listing 13.2) is particularly evident where there are numerous source files to compile and link, a situation you ll encounter later in this chapter. This listing shows the build script for our Hello Android application.

If you will use many objects from the System namespace (and you will), you can save typing by telling the compiler that many of the objects you ll refer to are in that namespace. That s what the using directive is for at the beginning of your program:

< xml version="1.0" encoding="UTF-8" > <!DOCTYPE daoConfig PUBLIC "-//ibatis.apache.org//DTD DAO Configuration 2.0//EN" "http://ibatis.apache.org/dtd/dao-2.dtd"> <daoConfig> <properties resource="config.properties"/> <context> <transactionManager type="JDBC"> <property name="DataSource" value="SIMPLE"/> <property name="JDBC.Driver" value="${jdbcDriver}" /> <property name="JDBC.ConnectionURL" value="${jdbcUrl}" /> <property name="JDBC.Username" value="${jdbcUser}" /> <property name="JDBC.Password" value="${jdbcPassword}" /> <property name="JDBC.DefaultAutoCommit" value="${jdbcAutoCommit}" /> </transactionManager> <dao interface="com.company.system.dao.AccountDao" implementation="${impl}.AccountDaoImpl"/> </context> </daoConfig>