Examples of org.knopflerfish.service.log.LogRef

org.knopflerfish.service.log.LogRef
LogRef is an utility class that simplifies the use of the LogService.
LogRef let you use the log without worrying about getting new service objects when the log service is restarted. It also supplies methods with short names that does logging with all the different LogService severity types.

To use the LogRef you need to import org.knopflerfish.service.log.LogRef and instantiate LogRef with your bundle context as parameter. The bundle context is used for getting the LogService and adding a service listener.

Example usage
The if statement that protects each call to the LogRef instance below is there to save the effort required for creating the message string object in cases where the log will throw away the log entry due to its unimportance. The user must have this if-test in his code since that is the only way to avoid constructing the string object. Placing it in the wrapper (LogRef) will not help due to the design of the Java programming language.
```
 package org.knopflerfish.example.hello; import org.osgi.framework.*; import org.knopflerfish.service.log.LogRef; public class Hello implements BundleActivator { LogRef log; public void start(BundleContext bundleContext) { log = new LogRef(bundleContext); if (log.doInfo()) log.info("Hello started."); } public void stop(BundleContext bundleContext) { if (log.doDebug()) log.debug("Hello stopped."); } } 
```
@author Gatespace AB @see org.osgi.service.log.LogService @see org.knopflerfish.service.log.LogService


  private FrameworkTrayIcon tray_icon = null;


  public void start(BundleContext _bc) {
    this.bc  = _bc;
    this.log = new LogRef(bc);


    EventQueue.invokeLater(new Runnable() {
      public void run()
      {
        try {

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    this.bc = bc;
    this.eventAdminTracker = eventAdminTracker;
    this.event = event;
    // Call only listeners that are present when the event happened.
    this.listeners = (Vector) listeners.clone();
    this.log = new LogRef(bc);
  }

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         */
        public EventGenerator(BundleContext context) {
          /* call the super class */
            super("Event generator");
            /* assign the log */
            log = new LogRef(context);
            assertNotNull(getName()+ " can't get the log service",log);
            bundleContext=context;
        }

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            return;
          }
        } catch (IllegalArgumentException iae){
          // An 'If-Modified-Since' header is present but the value
          // can not be parsed; ignore it.
          final LogRef log = Activator.log;
          if (null!=log && log.doDebug()) {
            log.debug("Ignoring broken 'If-Modified-Since' header: "
                      +iae.getMessage(), iae);
          }
        }
        response.setDateHeader("Last-Modified", date);
      }

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    public void start(BundleContext bc) {


        Activator.bc = bc;


        log = new LogRef(bc, true);


        serverFactory = new HttpServerFactory(bc, log);


        Dictionary parameters = new Hashtable();
        parameters.put("service.pid", FACTORY_PID);

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   }


   public void start(BundleContext bc)
              throws BundleException {
      try {
         log = new LogRef(bc, true);
         axisBundle = bc;
   setupAxis();
      } catch (Exception e) {
  log.error("Exception when starting bundle", e);
  throw new BundleException("Failed to start server");

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Examples of org.knopflerfish.service.log.LogRef

Example usage

Related Classes of org.knopflerfish.service.log.LogRef