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| |
| CUSTOM EXCHANGE LISTENER EXAMPLE |
| ================================ |
| |
| Purpose |
| ------- |
| Develop and deploy a custom exchange listener that captures |
| and reports, to the ServiceMix log, the exchanges that are |
| sent and delivered using the NMR. |
| |
| |
| Explanation |
| ----------- |
| The custom exchange listener is written in Java. See the |
| CustomExchangeListener.java file located in the following |
| directory of this example: |
| |
| src/main/java/org/apache/servicemix/nmr/examples/interceptors/exchange |
| |
| It uses the NMR event API, which can be used to receive notifications |
| about what is happening in the NMR. In particular, it implements the |
| EndpointExchange interface, which is called each time an exchange is |
| sent and delivered to an endpoint. |
| It has three methods: |
| |
| - exchangeSent: Called each time an exchange is sent. |
| |
| - exchangeDelivered: Called each time an exchange is delivered. |
| |
| - exchangeFailed: Called when an exchange results in an exception |
| being thrown and an exchange is not delivered. |
| |
| The custom exchange listener is configured in a beans.xml Spring file, |
| which registers the custom exchange listener as an OSGi service. The |
| beans.xml file is located in the src/main/resources/META-INF/spring |
| directory of this example. |
| |
| |
| Prerequisites for Building and Running the Example |
| -------------------------------------------------- |
| 1. You must have the following installed on your machine: |
| |
| - JDK 1.5 or higher |
| |
| - Maven 2.0.9 or higher (for building) |
| |
| For more information, see the README in the top-level |
| examples directory. |
| |
| |
| 2. Start ServiceMix by running the following command: |
| |
| <servicemix_home>/bin/servicemix (on UNIX) |
| <servicemix_home>\bin\servicemix (on Windows) |
| |
| |
| Building and Deploying |
| ---------------------- |
| To build this example, run the following command (from the directory |
| that contains this README): |
| |
| mvn install |
| |
| If all of the required OSGi bundles are available in your local |
| Maven repository, the example will build quickly. Otherwise it |
| may take some time for Maven to download everything it needs. |
| |
| Once complete, you will find the example JAR file, |
| exchange-${version}.jar, in the target directory of this |
| example. |
| |
| You can deploy the example in two ways: |
| |
| - Using Hot Deployment |
| -------------------- |
| |
| Copy the target/exchange-${version}.zip to the |
| <servicemix_home>/deploy directory. |
| |
| |
| - Using the ServiceMix Console |
| ---------------------------- |
| |
| Enter the following command: |
| |
| osgi:install -s mvn:org.apache.servicemix.nmr.examples.interceptors/exchange/${version}/jar |
| |
| |
| Once the bundle is installed, the listener is automatically started. |
| The next time an exchange is sent and delivered using the NMR, you |
| should see an entry in the log file in the data/log directory of your |
| ServiceMix installation. Look for CustomExchangeListener entries. |
| For example, if you run the NMR example (see the examples/nmr directory), |
| you should see output similar to following appearing in the log file: |
| |
| 13:59:18,560 | INFO | ndpoint-thread-1 | CustomExchangeListener | .exchange.CustomExchangeListener 28 | Sending exchange: [ |
| id: 954b56e6-7053-4ecd-9015-3d283506fab0 |
| mep: InOut |
| status: Active |
| role: Provider |
| target: PropertyMatchingReference[{NAME=EchoEndpoint}] |
| In: [ |
| content: Hello |
| ] |
| Out: [ |
| content: EchoHello |
| ] |
| ] |
| |
| |
| Stopping and Uninstalling the Example |
| ------------------------------------- |
| To stop or uninstall the example, you must first know the bundle ID |
| that ServiceMix has assigned to it. To get the bundle ID, enter |
| the following command at the ServiceMix console: |
| |
| osgi:list |
| |
| At the end of the listing, you should see an entry similar to the |
| following: |
| |
| [ 203] [Active ] [ ] [Started] [ 60] Apache ServiceMix NMR Example:: Exchange Listener (1.1.0.2-fuse) |
| |
| In this case, the bundle ID is 203. |
| |
| To stop the example, enter the following command at the ServiceMix |
| console: |
| |
| osgi:stop <bundle_id> |
| |
| To uninstall the example, enter the following command in |
| the ServiceMix console: |
| |
| osgi:uninstall <bundle_id> |
| |
| |
| Changing the Example |
| -------------------- |
| If you want to change the code or configuration, just use 'mvn install' |
| to rebuild the deployment bundle, and deploy it as before. |