Examples of org.osgi.framework.BundleContext.addServiceListener()

org.osgi.framework.BundleContext.addServiceListener()
Adds the specified {@code ServiceListener} object with the specified{@code filter} to the context bundle's list of listeners. See{@link Filter} for a description of the filter syntax.{@code ServiceListener} objects are notified when a service has alifecycle state change.
If the context bundle's list of listeners already contains a listener {@code l} such that {@code (l==listener)}, then this method replaces that listener's filter (which may be {@code null}) with the specified one (which may be {@code null}).
The listener is called if the filter criteria is met. To filter based upon the class of the service, the filter should reference the {@link Constants#OBJECTCLASS} property. If {@code filter} is {@code null}, all services are considered to match the filter.
When using a {@code filter}, it is possible that the {@code ServiceEvent}s for the complete lifecycle of a service will not be delivered to the listener. For example, if the {@code filter} only matches when theproperty {@code x} has the value {@code 1}, the listener will not be called if the service is registered with the property {@code x} not setto the value {@code 1}. Subsequently, when the service is modified setting property {@code x} to the value {@code 1}, the filter will match and the listener will be called with a {@code ServiceEvent} of type{@code MODIFIED}. Thus, the listener will not be called with a {@code ServiceEvent} of type {@code REGISTERED}.
If the Java Runtime Environment supports permissions, the {@code ServiceListener} object will be notified of a service event onlyif the bundle that is registering it has the {@code ServicePermission} toget the service using at least one of the named classes the service was registered under. @param listener The {@code ServiceListener} object to be added. @param filter The filter criteria. @throws InvalidSyntaxException If {@code filter} contains an invalidfilter string that cannot be parsed. @throws IllegalStateException If this BundleContext is no longer valid. @see ServiceEvent @see ServiceListener @see ServicePermission

          return ctx.getBundle(0).getBundleContext();
        }
      });
      if (systemBundle == null) systemBundle = ctx;
      systemBundle.addBundleListener(cacheClearoutListener);
      systemBundle.addServiceListener(cacheClearoutListener);
    }
  }


  private static final class ServiceKey
  {

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        BundleContext systemBundleContext = framework.getSystemBundleContext();


        try
        {
            systemBundleContext.addServiceListener(new ServiceListener()
            {
                public void serviceChanged(ServiceEvent serviceEvent)
                {
                    ServiceReference reference = serviceEvent.getServiceReference();

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                        holders.add(holder);
                    }
                }
            }, "(&(objectClass=" + URLStreamHandlerService.class.getName() + ")(" + URLConstants.URL_HANDLER_PROTOCOL + "=*))");


            systemBundleContext.addServiceListener(new ServiceListener()
            {
                public void serviceChanged(ServiceEvent serviceEvent)
                {
                    ServiceReference reference = serviceEvent.getServiceReference();

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  @Override
  // 注册
  public void register() {
    BundleContext bundleContext = getBundleContext();
    bundleContext.addServiceListener(serviceListener);
    super.register();
  }


  // 取消注册
  @Override

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    serviceChanged(event);
  }


  public void init() {
    BundleContext bundleContext = this.getBundleContext();
    bundleContext.addServiceListener(serviceListener);
    bundleContext.addBundleListener(bundleListener);
    init(0);
  }


  public void destory() {

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            ServiceListener listener = new ServiceListener() {
                public void serviceChanged(ServiceEvent event) {
                    commands.clear();
                }
            };
            context.addServiceListener(listener,
                    String.format("(&(%s=*)(%s=*))",
                            CommandProcessor.COMMAND_SCOPE,
                            CommandProcessor.COMMAND_FUNCTION));
        }
    }

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          return ctx.getBundle(0).getBundleContext();
        }
      });
      if (systemBundle == null) systemBundle = ctx;
      systemBundle.addBundleListener(cacheClearoutListener);
      systemBundle.addServiceListener(cacheClearoutListener);
    }
  }


  private static final class ServiceKey
  {

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    // events related to
    // LogReaderService
    String filter = "(objectclass=" + LogReaderService.class.getName()
        + ")";
    try {
      context.addServiceListener(servlistener, filter);
    } catch (InvalidSyntaxException e) {
      e.printStackTrace();
    }
  }

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            // Register the JNDI service listener
            jndiServiceListener = new JNDIServiceListener(syscontext);
            try {
                String filter = "(" + Constants.OBJECTCLASS + "=" + ObjectFactory.class.getName() + ")";
                syscontext.addServiceListener(jndiServiceListener, filter);
            } catch (InvalidSyntaxException e) {
                // ignore
            }


            // Register the socket-binding services

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            ServiceListener listener = new ServiceListener() {
                public void serviceChanged(ServiceEvent event) {
                    commands.clear();
                }
            };
            context.addServiceListener(listener,
                    String.format("(&(%s=*)(%s=*))",
                            CommandProcessor.COMMAND_SCOPE,
                            CommandProcessor.COMMAND_FUNCTION));
        }
    }

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