opendaylight/logging/bridge/src/main/java/org/opendaylight/controller/logging/bridge/internal/Activator.java

   1
   2 /*
   3  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   4  *
   5  * This program and the accompanying materials are made available under the
   6  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   7  * and is available at http://www.eclipse.org/legal/epl-v10.html
   8  */
   9
  10 package org.opendaylight.controller.logging.bridge.internal;
  11
  12 import org.osgi.service.log.LogEntry;
  13 import java.util.Enumeration;
  14 import org.osgi.framework.BundleContext;
  15 import org.osgi.framework.BundleException;
  16 import org.osgi.framework.BundleActivator;
  17 import org.osgi.framework.ServiceReference;
  18 import org.slf4j.Logger;
  19 import org.slf4j.LoggerFactory;
  20 import org.slf4j.ILoggerFactory;
  21 import org.osgi.service.log.LogReaderService;
  22
  23 public class Activator implements BundleActivator {
  24     private LogListenerImpl listener = null;
  25     private Logger log = null;
  26
  27     @Override
  28     public void start(BundleContext context) {
  29         // Lets trigger the resolution of the slf4j logger factory
  30         ILoggerFactory f = LoggerFactory.getILoggerFactory();
  31
  32         // Now retrieve a logger for the bridge
  33         log = f
  34                 .getLogger("org.opendaylight.controller.logging.bridge.OSGI2SLF4J");
  35
  36         if (this.log != null) {
  37             this.listener = new LogListenerImpl(log);
  38
  39             ServiceReference service = null;
  40             service = context.getServiceReference(LogReaderService.class
  41                     .getName());
  42             if (service != null) {
  43                 LogReaderService reader = (LogReaderService) context
  44                         .getService(service);
  45                 if (reader == null) {
  46                     this.log.error("Cannot register the LogListener because "
  47                             + "cannot retrieve LogReaderService");
  48                 }
  49                 reader.addLogListener(this.listener);
  50                 // Now lets walk all the exiting messages
  51                 Enumeration<LogEntry> entries = reader.getLog();
  52                 if (entries != null) {
  53                     while (entries.hasMoreElements()) {
  54                         LogEntry entry = (LogEntry) entries.nextElement();
  55                         this.listener.logged(entry);
  56                     }
  57                 }
  58
  59                 /*
  60                  * Install the default exception handler so that the uncaught
  61                  * exceptions are handled by our customized handler. This new
  62                  * handler will display the exceptions to OSGI console as well
  63                  * as log to file.
  64                  */
  65                 Thread.setDefaultUncaughtExceptionHandler(new org.opendaylight.
  66                         controller.logging.bridge.internal.UncaughtExceptionHandler());
  67
  68                 /*
  69                  * Install the Shutdown handler. This will intercept SIGTERM signal and
  70                  * close the system bundle. This allows for a graceful  closing of OSGI
  71                  * framework.
  72                  */
  73
  74                 Runtime.getRuntime().addShutdownHook(new shutdownHandler(context));
  75             } else {
  76                 this.log.error("Cannot register the LogListener because "
  77                         + "cannot retrieve LogReaderService");
  78             }
  79         } else {
  80             System.err
  81                     .println("Could not initialize the logging bridge subsytem");
  82         }
  83     }
  84
  85     @Override
  86     public void stop(BundleContext context) {
  87         ServiceReference service = null;
  88         service = context.getServiceReference(LogReaderService.class.getName());
  89         if (service != null) {
  90             LogReaderService reader = (LogReaderService) service;
  91             reader.removeLogListener(this.listener);
  92         }
  93
  94         this.listener = null;
  95         this.log = null;
  96     }
  97
  98     private class shutdownHandler extends Thread {
  99         BundleContext bundlecontext;
 100         public shutdownHandler(BundleContext ctxt) {
 101                 this.bundlecontext = ctxt;
 102         }
 103
 104         @Override
 105         public void run () {
 106             try {
 107                 this.bundlecontext.getBundle(0).stop();
 108                 log.debug("shutdown handler thread called");
 109             } catch (BundleException e) {
 110                 log.debug("Bundle couldn't be stopped");
 111             } catch (Exception e) {
 112                 log.debug("Unhandled exception");
 113             }
 114         }
 115     }
 116
 117 }