Examples of DbWatcher

org.xmlBlaster.contrib.dbwatcher.DbWatcher
This is the core processor class to handle database observation.
We handle detected changes of the observed target, typically a database table, and forward them to the {@link I_ChangePublisher} implementation,typically a message oriented middleware (MoM). The changes are XML formatted as implemented by the {@link I_DataConverter} plugin.

This class loads all plugins by reflection and starts them. Each plugin has its specific configuration paramaters. Descriptions thereof you find in the plugins documentation.

To get you quickly going have a look into Example.java
Configuration:
- dbPool.class configures your implementation of interface {@link I_DbPool} which defaults to org.xmlBlaster.contrib.db.DbPool
- db.queryMeatStatement if given a SQL select string this is executed on changes and the query result is dumped according to the configured I_DataConverter plugin and send as message content to the MoM
- converter.class configures your implementation of interface {@link I_DataConverter} which defaults to org.xmlBlaster.contrib.dbwatcher.convert.ResultSetToXmlConverter
- mom.class configures your implementation of interface {@link I_ChangePublisher} which defaults to org.xmlBlaster.contrib.dbwatcher.mom.XmlBlasterPublisher
- changeDetector.class configures your implementation of interface {@link I_ChangeDetector} which defaults to org.xmlBlaster.contrib.dbwatcher.detector.MD5ChangeDetector
- alertProducer.class configures your implementation of interface {@link I_AlertProducer} which defaults to org.xmlBlaster.contrib.dbwatcher.detector.AlertSchedulerHere you can configure multiple classes with a comma separated list. Each of them can trigger an new check in parallel, for example alertProducer.class=org.xmlBlaster.contrib.dbwatcher.mom.XmlBlasterPublisher,org.xmlBlaster.contrib.dbwatcher.detector.AlertSchedulery will check regularly via the AlertScheduler and on message via XmlBlasterPublisher
@see org.xmlBlaster.contrib.dbwatcher.test.TestResultSetToXmlConverter @author Marcel Ruff

Examples of org.xmlBlaster.contrib.dbwatcher.DbWatcher

         log.info("The DbWatcher has been successfully restarted");
      }
   }


   private static DbWatcher initializeDbWatcher(I_Info readerInfo, DbWriter dbWriter) throws Exception {
      DbWatcher dbWatcher = null;
      if (readerInfo != null) {
         try {
            log.info("setUp: Instantiating DbWatcher");
            GlobalInfo.setStrippedHostname(readerInfo, GlobalInfo.UPPER_CASE);
            dbWatcher = new DbWatcher();
            dbWatcher.init(readerInfo);
            
            I_DbSpecific dbSpecific = null;
            if (readerInfo != null) {
               if (readerInfo.getBoolean("replication.doBootstrap", false)) {
                  boolean needsPublisher = readerInfo.getBoolean(I_DbSpecific.NEEDS_PUBLISHER_KEY, true);
                  boolean forceCreationAndInitNo = false;
                  dbSpecific = ReplicationConverter.getDbSpecific(readerInfo, forceCreationAndInitNo); // done only on master !!!
                  readerInfo.put(I_DbSpecific.NEEDS_PUBLISHER_KEY, "" + needsPublisher); // back to original
                  I_DbPool pool = (I_DbPool)readerInfo.getObject("db.pool");
                  if (pool == null)
                     throw new Exception("ReplicationAgent.init: the db pool is null");
                  Connection conn = pool.reserve();
                  try {
                     boolean doWarn = false;
                     boolean force = false;
                     dbSpecific.bootstrap(conn, doWarn, force);
                  }
                  catch (Exception ex) {
                     conn = SpecificDefault.removeFromPool(conn, SpecificDefault.ROLLBACK_YES, pool);
                  }
                  finally {
                     conn = SpecificDefault.releaseIntoPool(conn, SpecificDefault.COMMIT_YES, pool);
                  }
               }
            }
            dbWatcher.startAlertProducers();
         }
         catch (Exception ex) {
            if (dbWriter != null) {
               try {
                  dbWriter.shutdown();

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Examples of org.xmlBlaster.contrib.dbwatcher.DbWatcher

   /**
    * @see org.xmlBlaster.util.plugin.I_Plugin#init(org.xmlBlaster.util.Global, org.xmlBlaster.util.plugin.PluginInfo)
    */
   protected void doInit(Global global_, PluginInfo pluginInfo) throws XmlBlasterException {
      try {
         this.dbWatcher = new DbWatcher(this);
         this.dbWatcher.startAlertProducers();
      }
      catch (Throwable e) {
         throw new XmlBlasterException(this.global, ErrorCode.RESOURCE_CONFIGURATION, "DbWatcherPlugin", "init failed", e); 
      }

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Examples of org.xmlBlaster.contrib.dbwatcher.DbWatcher

    */
   private void pollingExample(Preferences prefs) throws Exception {
      log.info("Start polling test");
      
      I_Info info = new Info(prefs);
      DbWatcher processor = new DbWatcher(info);
      processor.startAlertProducers();


      boolean interactive = info.getBoolean("interactive", true);
      if (interactive) {
         // Manually trigger db checking ...
         BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
         while (true) {
            System.out.print("Hit 'q' to exit, 't' to trigger an event > ");
            String line = in.readLine(); // Blocking in I/O
            if (line == null) continue;
            line = line.trim();
            if (line.toLowerCase().equals("q"))
               break;
            if (line.toLowerCase().equals("t"))
               processor.getChangeDetector().checkAgain(null);
         }
      }
      else {
         /*
         for (int i=0; i<10; i++) {
            processor.getChangeDetector().checkAgain(null);
            Thread.sleep(1000);
         }
         */
         log.info("Sleeping no a long time ...");
         Thread.sleep(1000000);
      }




      processor.shutdown();
      log.info("Done!");
   }

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Examples of org.xmlBlaster.contrib.dbwatcher.DbWatcher

                     " </qos>");
      System.setProperty("protocol", "SOCKET");
      System.setProperty("protocol/socket/hostname", "192.168.110.10");
      */


      DbWatcher pc = new DbWatcher(info);
      XmlBlasterPublisher mom = (XmlBlasterPublisher)pc.getMom();
      mom.subscribe("XPATH://key", new I_Update() {
         public void update(String topic, java.io.InputStream is, Map attrMap) {
            log.info("Received '" + topic + "' from MoM");
            try {
               writeToFile(topic, new String(TestUtils.getContent(is)));
            }
            catch (Exception e) {
               // Ignore   
            }
            updateMap.put(topic, is);
         }
      });
      
      try { Thread.sleep(1000); } catch(Exception e) { /* Ignore */ }
      updateMap.clear(); // Ignore any existing topics


      pc.startAlertProducers();
      
      return pc;
   }

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