[CONF] Apache CXF: DOSGi Discovery (page edited)

[confluence]

Page Edited : CXF : DOSGi Discovery DOSGi Discovery has been edited by David Bosschaert (Jun 10, 2009). (View changes) Content: This page outlines setting up the Discovery implementation that is part of CXF Distributed OSGi. @@@ This page is work in progress Introduction Installing and run the ZooKeeper server Read the ZooKeeper Getting Started page: http://hadoop.apache.org/zookeeper/docs/current/zookeeperStarted.html The ZooKeeper distribution doesn't contain any Windows scripts yet. If you're on Windows you can download scripts to start the ZooKeeper server and the client program from here. Once you have ZooKeeper installed (the current version used is 3.1.1), run its server: $ bin/zkServer ... log messages ... 2009-06-10 13:23:27,288 - INFO [main:filetxnsnap...@198] - Snapshotting: 0 The ZooKeeper server is now ready. You can check that all is well by running the client program: $ bin/zkCli localhost:2181 --> ls / Processing ls [zookeeper] So besides the zookeeper node, there is nothing in the ZooKeeper virtual filesystem yet. Installing the CXF Discovery Bundles The CXF/DOSGi Discovery implementation interacts with the ZooKeeper server. Like with the DOSGi/DSW component, there are two distributions. A single bundle distribution and a multi bundle one. Single Bundle Distribution The single bundle distribution assumes that you also have a single-bundle distribution of the DOSGi/DSW installed. -> install https://repository.apache.org/content/groups/snapshots/org/apache/cxf/dosgi/cxf-dosgi-ri-discovery-singlebundle-distribution/1.1-SNAPSHOT/cxf-dosgi-ri-discovery-singlebundle-distribution-1.1-SNAPSHOT.jar Bundle ID: 6 -> start 6 ... log messages ... -> ps START LEVEL 1 ID State Level Name [ 0] [Active ] [ 0] System Bundle (1.8.0) [ 1] [Active ] [ 1] Apache Felix Shell Service (1.2.0) [ 2] [Active ] [ 1] Apache Felix Shell TUI (1.2.0) [ 3] [Active ] [ 1] Apache Felix Bundle Repository (1.4.0) [ 4] [Resolved ] [ 1] OSGi R4 Compendium Bundle (4.1.0) [ 5] [Active ] [ 1] Distributed OSGi Distribution Software Single-Bundle Distribution (1.1.0.SNAPSHOT) [ 6] [Active ] [ 1] Distributed OSGi Zookeeper-Based Discovery Single-Bundle Distribution (1.1.0.SNAPSHOT) The Discovery bundle is now active, but it doesn't do anything yet since it's not yet configured. Multi Bundle Distribution TODO Configuring Discovery The CXF/Discovery component is configured through the OSGi Configuration Admin Service. For convenience the CXF/Discovery distributions come with the Configuration Admin and FileInstall implementations from Felix, but you can also use another implementation of the Configuration Admin service. When you start up the bundle(s) in the CXF/Discovery distribution, the FileInstall bundle will create a 'load' directory in the current working directory. This is where you can put Config Admin configurations. To configure the ZooKeeper client in CXF/Discovery the following configuration variables apply. They need to be set on Configuration Admin PID org.apache.cxf.dosgi.discovery.zookeeper. Configuration property Default Description zookeeper.host no default The host where the ZooKeeper server is running. zookeeper.port 2181 The port of the ZooKeeper server. zookeeper.timeout 3000 Sets the ZooKeeper tick time. For more information on the ZooKeeper configuration variables see the ZooKeeper administration guide: http://hadoop.apache.org/zookeeper/docs/current/zookeeperAdmin.html An easy way to set the configuration, it by placing a file called org.apache.cxf.dosgi.discovery.zookeeper.cfg in the load directory created by the FileInstall bundle with the following content: zookeeper.host = localhost As soon as you set the configuration, the Discovery will connect to the ZooKeeper server. You will see a few log messages on the ZooKeeper server console to reflect this. You can always check the configuration of the ZooKeeper client by looking at the ManagedService registered by the CXF/Discovery bundle: -> services 6 Distributed OSGi Zookeeper-Based Discovery Single-Bundle Distribution (6) provides: ----------------------------------------------------------------------------------- ... other services ... ---- objectClass = org.osgi.service.cm.ManagedService felix.fileinstall.filename = org.apache.cxf.dosgi.discovery.zookeeper.cfg service.id = 38 service.pid = org.apache.cxf.dosgi.discovery.zookeeper zookeeper.host = localhost zookeeper.port = 2181 zookeeper.timeout = 3000

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