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| Embedded and Remotable |
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| <H1><A name="EmbeddedandRemotable-Overview"></A>Overview</H1> |
| |
| <P>This example shows how to use OpenEJB3's remoting capabilities in an embedded scenario.</P> |
| |
| <P>The basic recipe is the same for a standard embedded scenario but with these added |
| ingreditents:</P> |
| |
| <UL> |
| <LI><B>openejb.embedded.remotable</B> property</LI> |
| <LI><B>openejb-ejbd</B> jar</LI> |
| </UL> |
| |
| |
| <P>While creating the InitialContext, pass in the openejb.embedded.remotable property with |
| the value of "true". When this is seen by the LocalInitialContextFactory, it will boot up |
| the Server ServiceManager in the VM which will in turn look for ServerServices in the |
| classpath.</P> |
| |
| <P>Provided you have the openejb-ejbd jar in your classpath along with it's dependencies |
| (openejb-server, openejb-client, openejb-core), then those services will be brought online |
| and remote clients will be able to connect into your vm and invoke beans.</P> |
| |
| <P>If you want to add more ServerServices such as the http version of the ejbd protocol you'd |
| simply add the openejb-httpejbd jar to your classpath. A number of ServerServices are |
| available currently:</P> |
| |
| <UL> |
| <LI>openejb-ejbd</LI> |
| <LI>openejb-http</LI> |
| <LI>openejb-telnet</LI> |
| <LI>openejb-derbynet</LI> |
| <LI>openejb-hsql</LI> |
| <LI>openejb-activemq</LI> |
| </UL> |
| |
| |
| <P>To run the example simply type:</P> |
| |
| <P> $ mvn clean install</P> |
| |
| |
| <TABLE cellpadding="5" width="85%" cellspacing="8px" class="noteMacro" border="0" align="center"><COLGROUP><COL width="24"><COL></COLGROUP><TR><TD valign="top"><IMG src="http://cwiki.apache.org/confluence/images/icons/emoticons/warning.gif" width="16" height="16" align="absmiddle" alt="" border="0"></TD><TD> |
| <P>If your goal is simply to unit test beans with remote interfaces, this is <B>not</B> the right example for you. The LocalInitialContextFactory completely supports remote interfaces and all spec required pass-by-value (serialization) semantics without the need for network sockets. This example shows the use of OpenEJB in an embedded environment where connection <B>outside</B> the <BR> |
| vm is required.</P></TD></TR></TABLE> |
| |
| <H1><A name="EmbeddedandRemotable-TheCode"></A>The Code</H1> |
| |
| <P>For this example we have a simple Stateful bean called TelephoneBean as defined below. As a simple way of demonstrating the state we have to methods: speak and listen. You call <EM>speak</EM> and pass in some text, then you call <EM>listen</EM> to get your answer.</P> |
| |
| <H5><A name="EmbeddedandRemotable-bean"></A>bean</H5> |
| |
| An error occurred: http://svn.apache.org/repos/asf/openejb/trunk/openejb3/examples/telephone-stateful/src/main/java/org/apache/openejb/examples/telephone/TelephoneBean.java. The system administrator has been notified. |
| |
| <H5><A name="EmbeddedandRemotable-businessinterface"></A>business interface</H5> |
| |
| An error occurred: http://svn.apache.org/repos/asf/openejb/trunk/openejb3/examples/telephone-stateful/src/main/java/org/apache/openejb/examples/telephone/Telephone.java. The system administrator has been notified. |
| |
| <TABLE cellpadding="5" width="85%" cellspacing="8px" class="tipMacro" border="0" align="center"><COLGROUP><COL width="24"><COL></COLGROUP><TR><TD valign="top"><IMG src="http://cwiki.apache.org/confluence/images/icons/emoticons/check.gif" width="16" height="16" align="absmiddle" alt="" border="0"></TD><TD><B class="strong">EJB3 Notes</B><BR> |
| <P>The bean class uses the annotation <B>@Remote</B> but does not specify a list of interfaces as is normally required. Per EJB3 rules, if the bean implements exactly <B>one business interface</B> it may use @Remote with no other values and that business interface is then implied to be a remote business interface. The same rule applies to identical usage of @Local.</P> |
| |
| <P>The critical thing to know is that if you add another interface the rules change and require that you specify both interfaces in the @Remote annotation as in @Remote({Telephone.class, SecondInterface.class}).</P></TD></TR></TABLE> |
| |
| <H1><A name="EmbeddedandRemotable-Embedding"></A>Embedding</H1> |
| |
| <P>We're going to embed OpenEJB3 into a plain JUnit TestCase as a simple means of demonstrating the remote capabilities. We'll do the embedding in our test setUp method, then will make two test methods: </P> |
| <UL class="alternate" type="square"> |
| <LI>one for invoking the bean's remote interface via the <B>LocalInitialContextFactory</B> which goes straight against the embedded container system</LI> |
| <LI>one for invoking the bean's remote interface via the <B>RemoteInitialContextFactory</B> which connects to a Socket and communicates to the embedded container system over the ejbd protocol.</LI> |
| </UL> |
| |
| |
| <H4><A name="EmbeddedandRemotable-setUp"></A>setUp</H4> |
| |
| An error occurred: http://svn.apache.org/repos/asf/openejb/trunk/openejb3/examples/telephone-stateful/src/test/java/org/apache/openejb/examples/telephone/TelephoneTest.java. The system administrator has been notified. |
| |
| <H4><A name="EmbeddedandRemotable-LocalInitialContextFactory%3Amakinginvmcallstoaremotebusinessinterface"></A>LocalInitialContextFactory: making in-vm calls to a remote business interface</H4> |
| |
| An error occurred: http://svn.apache.org/repos/asf/openejb/trunk/openejb3/examples/telephone-stateful/src/test/java/org/apache/openejb/examples/telephone/TelephoneTest.java. The system administrator has been notified. |
| |
| <H4><A name="EmbeddedandRemotable-RemoteInitialContextFactory%3Amakingnetworkedcallstoaremotebusinessinterface"></A>RemoteInitialContextFactory: making networked calls to a remote business interface</H4> |
| |
| <P>This is the part you would want to do in apps that are running a different VM than the one in which the ejb container is embedded. These "client" VMs need only have the the <B>openejb-client jar</B> in their classpath and connect to OpenEJB via the RemoteInitialContextFactory like any other remote EJB client.</P> |
| |
| An error occurred: http://svn.apache.org/repos/asf/openejb/trunk/openejb3/examples/telephone-stateful/src/test/java/org/apache/openejb/examples/telephone/TelephoneTest.java. The system administrator has been notified. |
| |
| <H1><A name="EmbeddedandRemotable-Mavensetup"></A>Maven setup</H1> |
| |
| <P>Nice thing about maven2 is it has test-only dependencies. |
| This guarantees that non of your runtime code is dependent |
| on any OpenEJB classes.</P> |
| |
| <P>You need this dep or no clients will be able to connect |
| over the ejbd protocol to the embedded ejb container.</P> |
| |
| <P>Notice the other examples use 'openejb-core' and this one |
| uses 'openejb-ejbd'. If you wanted to make more protocols |
| available, you simply have to add deps to them and they'll |
| get picked up in the classpath automatically.</P> |
| |
| <DIV class="code"><DIV class="codeContent"> |
| <PRE class="code-xml"><SPAN class="code-tag"><dependency></SPAN> |
| <SPAN class="code-tag"><groupId></SPAN>org.apache.openejb<SPAN class="code-tag"></groupId></SPAN> |
| <SPAN class="code-tag"><artifactId></SPAN>openejb-ejbd<SPAN class="code-tag"></artifactId></SPAN> |
| <SPAN class="code-tag"><version></SPAN>3.0.0-SNAPSHOT<SPAN class="code-tag"></version></SPAN> |
| <SPAN class="code-tag"><scope></SPAN>test<SPAN class="code-tag"></scope></SPAN> |
| <SPAN class="code-tag"></dependency></SPAN></PRE> |
| </DIV></DIV> |
| |
| |
| <H1><A name="EmbeddedandRemotable-Running"></A>Running</H1> |
| |
| <P>Running the example is fairly simple, just run:</P> |
| |
| <P>$ cd telephone-stateful<BR> |
| $ mvn clean install</P> |
| |
| <P>Which should create output like the following.</P> |
| |
| <DIV class="preformatted"><DIV class="preformattedContent"> |
| <PRE>[OPENEJB:INFO] Scanning for projects... |
| [OPENEJB:INFO] ---------------------------------------------------------------------------- |
| [OPENEJB:INFO] Building OpenEJB :: Examples :: Telephone Stateful Pojo |
| [OPENEJB:INFO] task-segment: [OPENEJB:clean, install] |
| [OPENEJB:INFO] ---------------------------------------------------------------------------- |
| [OPENEJB:INFO] [clean:clean] |
| [OPENEJB:INFO] Deleting directory /Users/dblevins/work/openejb3/examples/telephone-stateful/target |
| [OPENEJB:INFO] Deleting directory /Users/dblevins/work/openejb3/examples/telephone-stateful/target/classes |
| [OPENEJB:INFO] Deleting directory /Users/dblevins/work/openejb3/examples/telephone-stateful/target/test-classes |
| [OPENEJB:INFO] [resources:resources] |
| [OPENEJB:INFO] Using default encoding to copy filtered resources. |
| [OPENEJB:INFO] [compiler:compile] |
| Compiling 2 source files to /Users/dblevins/work/openejb3/examples/telephone-stateful/target/classes |
| [OPENEJB:INFO] [resources:testResources] |
| [OPENEJB:INFO] Using default encoding to copy filtered resources. |
| [OPENEJB:INFO] [compiler:testCompile] |
| Compiling 1 source file to /Users/dblevins/work/openejb3/examples/telephone-stateful/target/test-classes |
| [OPENEJB:INFO] [surefire:test] |
| [OPENEJB:INFO] Surefire report directory: /Users/dblevins/work/openejb3/examples/telephone-stateful/target/surefire-reports |
| |
| ------------------------------------------------------- |
| T E S T S |
| ------------------------------------------------------- |
| Running org.apache.openejb.examples.telephone.TelephoneTest |
| log4j:WARN No appenders could be found for logger (OpenEJB). |
| log4j:WARN Please initialize the log4j system properly. |
| Apache OpenEJB 3.0-incubating-SNAPSHOT build: 20061228-01:59 |
| http://incubator.apache.org/openejb |
| 23:04:38,699 INFO [Startup] Found EjbModule in classpath: /Users/dblevins/work/openejb3/examples/telephone-stateful/target/classes |
| 23:04:39,625 WARN [Startup] No ejb-jar.xml found assuming annotated beans present |
| 23:04:39,658 WARN [OPENEJB:OpenEJB] Auto-deploying ejb TelephoneBean: EjbDeployment(deployment-id=TelephoneBean, container-id=Default Stateful Container) |
| 23:04:39,659 WARN [OPENEJB:OpenEJB] Auto-creating a container for bean TelephoneBean: Container(type=STATEFUL, id=Default Stateful Container) |
| 23:04:39,678 INFO [Startup] Loaded Module: /Users/dblevins/work/openejb3/examples/telephone-stateful/target/classes |
| 23:04:40,140 INFO [Startup] OpenEJB ready. |
| OpenEJB ready. |
| ** Starting Services ** |
| NAME IP PORT |
| ejbd 0.0.0.0 4201 |
| admin thread 0.0.0.0 4200 |
| ------- |
| Ready! |
| Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.899 sec |
| |
| Results : |
| Tests run: 2, Failures: 0, Errors: 0, Skipped: 0 |
| |
| [OPENEJB:INFO] [jar:jar] |
| [OPENEJB:INFO] Building jar: /Users/dblevins/work/openejb3/examples/telephone-stateful/target/telephone-stateful-1.0-SNAPSHOT.jar |
| [OPENEJB:INFO] [install:install] |
| [OPENEJB:INFO] Installing /Users/dblevins/work/openejb3/examples/telephone-stateful/target/telephone-stateful-1.0-SNAPSHOT.jar to ... |
| [OPENEJB:INFO] ------------------------------------------------------------------------ |
| [OPENEJB:INFO] BUILD SUCCESSFUL |
| [OPENEJB:INFO] ------------------------------------------------------------------------ |
| [OPENEJB:INFO] Total time: 11 seconds |
| [OPENEJB:INFO] Finished at: Thu Dec 28 23:04:41 PST 2006 |
| [OPENEJB:INFO] Final Memory: 19M/254M |
| [OPENEJB:INFO] ------------------------------------------------------------------------ |
| </PRE> |
| </DIV></DIV> |
| |
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