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| Custom Injection |
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| <H1><A name="CustomInjection-Overview"></A>Overview</H1> |
| |
| <P>As noted in the <A href="injection-of-env-entry-example.html" title="Injection of env-entry Example">Injection of env-entry Example</A>, the EJB 3.0 supported env-entry types are fairly limited. Also the use of several <env-entry> tags in an ejb-jar.xml can get a bit verbose.</P> |
| |
| <P>OpenEJB does not restrict you to just these data types or require you to use an ejb-jar.xml to declare them.</P> |
| |
| <UL class="alternate" type="square"> |
| <LI><B>@Resource</B> can be used on any type for which there is <B>java.beans.PropertyEditor</B></LI> |
| <LI>You may <B>install your own</B> PropertyEditors and package them with your app.</LI> |
| <LI>Java <B>Generics</B> are supported (e.g. List<URI> myURIs)</LI> |
| <LI>You may use a <B>META-INF/env-entries.properties</B> file as an alternative to an ejb-jar.xml</LI> |
| </UL> |
| |
| |
| <P>See <A href="built-in-type-converters.html" title="Built-in Type Converters">Built-in Type Converters</A> for a full list of supported env-entry types.</P> |
| |
| <P><EM>The source for this example is the "custom-injection" directory located in the <A href="../OPENEJB/download.html" title="Download">openejb-examples.zip</A> available on the download page.</EM></P> |
| |
| <H1><A name="CustomInjection-TheCode"></A>The Code</H1> |
| |
| <H2><A name="CustomInjection-BeanClass"></A>Bean Class</H2> |
| |
| <DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent"> |
| <PRE class="code-java">@Stateless |
| <SPAN class="code-keyword">public</SPAN> class StratocasterImpl <SPAN class="code-keyword">implements</SPAN> Stratocaster { |
| |
| |
| @Resource(name = <SPAN class="code-quote">"pickups"</SPAN>) |
| <SPAN class="code-keyword">private</SPAN> List<Pickup> pickups; |
| |
| @Resource(name = <SPAN class="code-quote">"style"</SPAN>) |
| <SPAN class="code-keyword">private</SPAN> Style style; |
| |
| @Resource(name = <SPAN class="code-quote">"dateCreated"</SPAN>) |
| <SPAN class="code-keyword">private</SPAN> Date dateCreated; |
| |
| @Resource(name = <SPAN class="code-quote">"guitarStringGuages"</SPAN>) |
| <SPAN class="code-keyword">private</SPAN> Map<<SPAN class="code-object">String</SPAN>, <SPAN class="code-object">Float</SPAN>> guitarStringGuages; |
| |
| @Resource(name = <SPAN class="code-quote">"certificateOfAuthenticity"</SPAN>) |
| <SPAN class="code-keyword">private</SPAN> File certificateOfAuthenticity; |
| |
| <SPAN class="code-keyword">public</SPAN> Date getDateCreated() { |
| <SPAN class="code-keyword">return</SPAN> dateCreated; |
| } |
| |
| /** |
| * Gets the guage of the electric guitar strings |
| * used in <SPAN class="code-keyword">this</SPAN> guitar. |
| * @param string |
| * @<SPAN class="code-keyword">return</SPAN> |
| */ |
| <SPAN class="code-keyword">public</SPAN> <SPAN class="code-object">float</SPAN> getStringGuage(<SPAN class="code-object">String</SPAN> string){ |
| <SPAN class="code-keyword">return</SPAN> guitarStringGuages.get(string); |
| } |
| |
| <SPAN class="code-keyword">public</SPAN> List<Pickup> getPickups() { |
| <SPAN class="code-keyword">return</SPAN> pickups; |
| } |
| |
| <SPAN class="code-keyword">public</SPAN> Style getStyle() { |
| <SPAN class="code-keyword">return</SPAN> style; |
| } |
| |
| <SPAN class="code-keyword">public</SPAN> File getCertificateOfAuthenticity() { |
| <SPAN class="code-keyword">return</SPAN> certificateOfAuthenticity; |
| } |
| } |
| </PRE> |
| </DIV></DIV> |
| |
| <H2><A name="CustomInjection-TheMETAINF%2Fenventries.propertiesfile"></A>The META-INF/env-entries.properties file</H2> |
| |
| <DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent"> |
| <PRE class="code-none">guitarStringGuages=E1=0.052\nA=0.042\nD=0.030\nG=0.017\nB=0.013\nE=0.010 |
| certificateOfAuthenticity=/tmp/strat-certificate.txt |
| dateCreated=1962-03-01 |
| pickups=S,S,S |
| style=VINTAGE |
| </PRE> |
| </DIV></DIV> |
| |
| <H2><A name="CustomInjection-TheCustomTypeandEditor"></A>The Custom Type and Editor</H2> |
| |
| <P>Support for java.lang.Enum types is already built-in, but we've decided we'd like to allow abbreviated versions of the enum constants to be usable. We do this by creating a custom PropertyEditor for our Pickup enum like so:</P> |
| |
| <DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent"> |
| <PRE class="code-java"><SPAN class="code-keyword">public</SPAN> class PickupEditor <SPAN class="code-keyword">extends</SPAN> java.beans.PropertyEditorSupport { |
| |
| <SPAN class="code-keyword">public</SPAN> void setAsText(<SPAN class="code-object">String</SPAN> text) <SPAN class="code-keyword">throws</SPAN> IllegalArgumentException { |
| text = text.trim(); |
| |
| <SPAN class="code-keyword">if</SPAN> (text.equalsIgnoreCase(<SPAN class="code-quote">"H"</SPAN>)) setValue(Pickup.HUMBUCKER); |
| <SPAN class="code-keyword">else</SPAN> <SPAN class="code-keyword">if</SPAN> (text.equalsIgnoreCase(<SPAN class="code-quote">"S"</SPAN>)) setValue(Pickup.SINGLE_COIL); |
| <SPAN class="code-keyword">else</SPAN> <SPAN class="code-keyword">throw</SPAN> <SPAN class="code-keyword">new</SPAN> IllegalStateException(<SPAN class="code-quote">"H and S are the only supported Pickup aliases"</SPAN>); |
| } |
| } |
| </PRE> |
| </DIV></DIV> |
| |
| <P>We cleverly install this PropertyEditor in a static block in the Pickup class that will be executed should someone actually reference the Pickup type.</P> |
| |
| <DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent"> |
| <PRE class="code-java"><SPAN class="code-keyword">import</SPAN> java.beans.PropertyEditorManager; |
| |
| <SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">enum</SPAN> Pickup { |
| |
| HUMBUCKER, |
| SINGLE_COIL; |
| |
| <SPAN class="code-comment">// Here's the little magic where we register the PickupEditor |
| </SPAN> <SPAN class="code-comment">// which knows how to create <SPAN class="code-keyword">this</SPAN> object from a string. |
| </SPAN> <SPAN class="code-comment">// You can add any of your own Property Editors in the same way. |
| </SPAN> <SPAN class="code-keyword">static</SPAN> { |
| PropertyEditorManager.registerEditor(Pickup.class, PickupEditor.class); |
| } |
| } |
| </PRE> |
| </DIV></DIV> |
| |
| <H1><A name="CustomInjection-TestCase"></A>Test Case</H1> |
| |
| <DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent"> |
| <PRE class="code-java"><SPAN class="code-keyword">public</SPAN> class StratocasterTest <SPAN class="code-keyword">extends</SPAN> TestCase { |
| |
| <SPAN class="code-keyword">private</SPAN> InitialContext initialContext; |
| |
| <SPAN class="code-keyword">protected</SPAN> void setUp() <SPAN class="code-keyword">throws</SPAN> Exception { |
| Properties properties = <SPAN class="code-keyword">new</SPAN> Properties(); |
| properties.setProperty(Context.INITIAL_CONTEXT_FACTORY, <SPAN class="code-quote">"org.apache.openejb.client.LocalInitialContextFactory"</SPAN>); |
| |
| initialContext = <SPAN class="code-keyword">new</SPAN> InitialContext(properties); |
| } |
| |
| <SPAN class="code-keyword">public</SPAN> void test() <SPAN class="code-keyword">throws</SPAN> Exception { |
| Stratocaster strat = (Stratocaster) initialContext.lookup(<SPAN class="code-quote">"StratocasterImplLocal"</SPAN>); |
| |
| |
| Date date = DateFormat.getDateInstance(DateFormat.MEDIUM, Locale.US).parse(<SPAN class="code-quote">"Mar 1, 1962"</SPAN>); |
| assertEquals(<SPAN class="code-quote">"Strat.getDateCreated()"</SPAN>, date, strat.getDateCreated()); |
| |
| List<Pickup> pickups = asList(Pickup.SINGLE_COIL, Pickup.SINGLE_COIL, Pickup.SINGLE_COIL); |
| assertEquals(<SPAN class="code-quote">"Strat.getPickups()"</SPAN>, pickups, strat.getPickups()); |
| |
| assertEquals(<SPAN class="code-quote">"Strat.getStyle()"</SPAN>, Style.VINTAGE, strat.getStyle()); |
| |
| assertEquals(<SPAN class="code-quote">"Strat.getStringGuage(\"</SPAN>E1\<SPAN class="code-quote">")"</SPAN>, 0.052F, strat.getStringGuage(<SPAN class="code-quote">"E1"</SPAN>)); |
| assertEquals(<SPAN class="code-quote">"Strat.getStringGuage(\"</SPAN>A\<SPAN class="code-quote">")"</SPAN>, 0.042F, strat.getStringGuage(<SPAN class="code-quote">"A"</SPAN>)); |
| assertEquals(<SPAN class="code-quote">"Strat.getStringGuage(\"</SPAN>D\<SPAN class="code-quote">")"</SPAN>, 0.030F, strat.getStringGuage(<SPAN class="code-quote">"D"</SPAN>)); |
| assertEquals(<SPAN class="code-quote">"Strat.getStringGuage(\"</SPAN>G\<SPAN class="code-quote">")"</SPAN>, 0.017F, strat.getStringGuage(<SPAN class="code-quote">"G"</SPAN>)); |
| assertEquals(<SPAN class="code-quote">"Strat.getStringGuage(\"</SPAN>B\<SPAN class="code-quote">")"</SPAN>, 0.013F, strat.getStringGuage(<SPAN class="code-quote">"B"</SPAN>)); |
| assertEquals(<SPAN class="code-quote">"Strat.getStringGuage(\"</SPAN>E\<SPAN class="code-quote">")"</SPAN>, 0.010F, strat.getStringGuage(<SPAN class="code-quote">"E"</SPAN>)); |
| |
| File file = <SPAN class="code-keyword">new</SPAN> File(<SPAN class="code-quote">"/tmp/strat-certificate.txt"</SPAN>); |
| assertEquals(<SPAN class="code-quote">"Strat.getCertificateOfAuthenticity()"</SPAN>, file, strat.getCertificateOfAuthenticity()); |
| |
| |
| } |
| } |
| </PRE> |
| </DIV></DIV> |
| |
| <H1><A name="CustomInjection-Runningit"></A>Running it</H1> |
| |
| <P>Running the example is fairly simple. In the "custom-injection" directory of the <A href="../OPENEJB/download.html" title="Download">examples zip</A>, just run:</P> |
| |
| <BLOCKQUOTE> |
| <P>$ mvn clean install</P></BLOCKQUOTE> |
| |
| <P>Which should create output like the following.</P> |
| |
| <DIV class="preformatted panel" style="border-width: 1px;"><DIV class="preformattedContent panelContent"> |
| <PRE>------------------------------------------------------- |
| T E S T S |
| ------------------------------------------------------- |
| Running org.superbiz.enventries.StratocasterTest |
| Apache OpenEJB 3.1-SNAPSHOT build: 20080409-12:05 |
| http://openejb.apache.org/ |
| INFO - openejb.home = /Users/dblevins/work/openejb3/examples/custom-injection |
| INFO - openejb.base = /Users/dblevins/work/openejb3/examples/custom-injection |
| INFO - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service) |
| INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager) |
| INFO - Configuring Service(id=Default JDK 1.3 ProxyFactory, type=ProxyFactory, provider-id=Default JDK 1.3 ProxyFactory) |
| INFO - Found EjbModule in classpath: /Users/dblevins/work/openejb3/examples/custom-injection/target/classes |
| INFO - Configuring app: /Users/dblevins/work/openejb3/examples/custom-injection/target/classes |
| INFO - Configuring Service(id=Default Stateless Container, type=Container, provider-id=Default Stateless Container) |
| INFO - Auto-creating a container for bean StratocasterImpl: Container(type=STATELESS, id=Default Stateless Container) |
| INFO - Loaded Module: /Users/dblevins/work/openejb3/examples/custom-injection/target/classes |
| INFO - Assembling app: /Users/dblevins/work/openejb3/examples/custom-injection/target/classes |
| INFO - Jndi(name=StratocasterImplLocal) --> Ejb(deployment-id=StratocasterImpl) |
| INFO - Created Ejb(deployment-id=StratocasterImpl, ejb-name=StratocasterImpl, container=Default Stateless Container) |
| INFO - Deployed Application(path=/Users/dblevins/work/openejb3/examples/custom-injection/target/classes) |
| Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.705 sec |
| |
| Results : |
| |
| Tests run: 1, Failures: 0, Errors: 0, Skipped: 0 |
| </PRE> |
| </DIV></DIV> |
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