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Table 3.1 Sun s JDK 1.3.1 javac compared to Ant s wrapper <javac> task. Note the similarities between all of the parameters. Also note Ant s way of using domain-specific terminology for concepts such as classpath. This fundamental concept of specifying a build in a higher-level language is one of Ant s greatest benefits over any other alternative to building Java projects. Option Name Debugging info JDK s javac switch -g (generate all debugging info) -g:{lines,vars,source} (generate only some debugging info) Optimize Generate no warnings Output messages about what the compiler is doing Output source locations where deprecated APIs are used -O -nowarn -verbose -deprecation Ant s <javac> syntax debug="yes" debug="yes" debuglevel="lines,vars,source" optimize="yes" nowarn="true" verbose="true" deprecation="on"

strategy you d like to use for each class and each collection. In the second step, you enable your preferred cache provider in the global Hibernate configuration and customize the provider-specific settings and physical cache regions. For example, if you re using OSCache, you edit oscache.properties, or for EHCache, ehcache.xml in your classpath. Let s enable caching for the CaveatEmptor Category, Item, and Bid classes.

-g:none (generate no debugging info) debug="no"

First we ll consider each entity class and collection and find out what cache concurrency strategy may be appropriate. After we select a cache provider for local and clustered caching, we ll write their configuration file(s).

Table 3.1 Sun s JDK 1.3.1 javac compared to Ant s wrapper <javac> task. Note the similarities between all of the parameters. Also note Ant s way of using domain-specific terminology for concepts such as classpath. This fundamental concept of specifying a build in a higher-level language is one of Ant s greatest benefits over any other alternative to building Java projects. (continued) Option Name JDK s javac switch Ant s <javac> syntax <classpath> <pathelement location="lib/some.jar"/> </classpath> <src path="src"/> <bootclasspath /> <extdirs /> destdir="build" encoding=" " target="1.1" source="1.4"

The Category has a small number of instances and is updated rarely, and instances are shared between many users. It s a great candidate for use of the second-level cache. Start by adding the mapping element required to tell Hibernate to cache Category instances.

<class name="auction.model.Category" table="CATEGORY"> <cache usage="read-write"/> <id ... </class>

Specify where to find input source files Override location of bootstrap class files Override location of installed extensions Specify where to place generated class files Specify character encoding used by source files Generate class files for specific VM version Enable JDK 1.4 assertions

The usage="read-write" attribute tells Hibernate to use a read-write concurrency strategy for the auction.model.Category cache. Hibernate now hits the second-level cache whenever you navigate to a Category or when you load a Category by identifier. If you use annotations, you need a Hibernate extension:

-sourcepath <path> -bootclasspath <path> -extdirs <dirs> -d <directory> -encoding <encoding> -target 1.1 -source 1.4

@Entity @Table(name = "CATEGORY") @org.hibernate.annotations.Cache(usage = org.hibernate.annotations.CacheConcurrencyStrategy.READ_WRITE ) public class Category { ... }

Ant itself is not a Java compiler; it simply contains a fa ade over compilers such as Sun s javac. You need a Java compiler such as the JDK javac compiler. See appendix A for installation and configuration information in order to use <javac>.

You use read-write instead of nonstrict-read-write because Category is a highly concurrent class, shared between many concurrent transactions. (It s clear that a read committed isolation level is good enough.) A nonstrict-read-write

would rely only on cache expiration (timeout), but you prefer changes to categories to be visible immediately. The class caches are always enabled for a whole hierarchy of persistent classes. You can't only cache instances of a particular subclass. This mapping is enough to tell Hibernate to cache all simple Category property values, but not the state of associated entities or collections. Collections require their own <cache> region. For the items collection you use a read-write concurrency strategy:

The <javac> syntax shown in table 3.1 introduces several new attributes, as well as several new subelements of <javac>. Most of these attributes are Boolean in nature debug, optimize, nowarn, verbose, and deprecation. Ant allows flexibility in how Booleans can be specified with on, true, and yes all representing true, and any other value mapping to false. The elements <classpath>, <src>, <bootclasspath>, and <extdirs> introduce one of Ant s greatest assets its path and file handling capability. Each of these elements represents a path. For comparisons sake, to compile the code for our projects-indexing Ant task using Sun s JDK 1.3.1 javac compiler, the following command line is used:

<class name="auction.model.Category" table="CATEGORY"> <cache usage="read-write"/> <id ... <set name="items"> <cache usage="read-write"/> <key ... </set> </class>

javac -d build\classes -classpath lib\lucene-1.2-rc3\lucene-1.2-rc3.jar; lib\jtidy-04aug2000r7-dev\build\Tidy.jar; C:\AntBook\jakarta-ant-1.5\lib\ant.jar; -sourcepath src -g src\org\example\antbook\ant\lucene\*.java