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

        closeLogRef();
    }


    private void createLogRef() {
        throwIfBundleContextIsNull();
        log = new LogRef(bc);
    }

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  public void start(final BundleContext bc)
    throws BundleException
  {
    Activator.bc  = bc;
    Activator.log = new LogRef(bc);


    httpTracker = new ServiceTracker(bc, HttpService.class.getName(), null) {
        public Object addingService(final ServiceReference sr)
        {
          return register(sr);

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  /**
   * Construct an EventQueue.
   * 
   */
  EventQueue( BundleContext bc ) {
    this.log = new LogRef(bc);
  }

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    static LogRef log;
    ServiceRegistration umsr;


    public void start(BundleContext bc) {
        Activator.bc = bc;
        log = new LogRef(bc);
        uai = new UserAdminImpl();
        umsr = bc.registerService(UserAdmin.class.getName(), uai,
                new Hashtable());
    }

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  SystemMetatypeProvider sysMTP;
  SysPropMetatypeProvider spMTP;
  public void start(BundleContext _bc) {


    this.bc = _bc;
    this.log = new LogRef(bc);


    sysMTP = new SystemMetatypeProvider(bc);
    sysMTP.open();


    bc.registerService(new String[] {

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    // BundleActivator methods implementation


    public void start(BundleContext bc) {
        TelnetServer.bc = bc;


        log = new LogRef(bc, true);


        telnetSessions = new Hashtable();


        Hashtable conf = new Hashtable();
        try {

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    } catch (Exception ignored) {
    }




    Activator.bc        = _bc;
    Activator.log       = new LogRef(bc);
    Activator.myself    = this;


    remoteTracker = new ServiceTracker(bc, RemoteFramework.class.getName(), null) {
        public Object addingService(ServiceReference sr) {
          Object obj = super.addingService(sr);

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  public static BundleContext bc;
  public static LogRef        log;


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


    CommandGroup cg = new SOAPCommandGroup();
    Hashtable props = new Hashtable();
    props.put(CommandGroup.GROUP_NAME, cg.getGroupName());
    bc.registerService(CommandGroup.class.getName(), cg, props);

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  static LogRef log;


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


    String alias = bc.getProperty("org.knopflerfish.httpconsole.alias");
    if(alias != null && !"".equals(alias)) {
      SERVLET_ALIAS = alias.trim();
    }

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    BasicDriverLocator(BundleContext bc) {
        this.bc = bc;


        // Try to get log service and handle it's life cycle
        log = new LogRef(bc);


        String jars = bc.getProperty("org.knopflerfish.gosg.jars");
        jarbase = (null==jars || jars.length()==0) ? "file:" : jars;
    }

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Examples of org.knopflerfish.service.log.LogRef

Example usage

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