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.ServiceRegistration;
  18 import org.osgi.framework.ServiceReference;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21 import org.slf4j.ILoggerFactory;
  22 import org.osgi.service.log.LogReaderService;
  23
  24 public class Activator implements BundleActivator {
  25     private LogListenerImpl listener = null;
  26     private Logger log = null;
  27
  28     @Override
  29     public void start(BundleContext context) {
  30         // Lets trigger the resolution of the slf4j logger factory
  31         ILoggerFactory f = LoggerFactory.getILoggerFactory();
  32
  33         // Now retrieve a logger for the bridge
  34         log = f
  35                 .getLogger("org.opendaylight.controller.logging.bridge.OSGI2SLF4J");
  36
  37         if (this.log != null) {
  38             this.listener = new LogListenerImpl(log);
  39
  40             ServiceReference service = null;
  41             service = context.getServiceReference(LogReaderService.class
  42                     .getName());
  43             if (service != null) {
  44                 LogReaderService reader = (LogReaderService) context
  45                         .getService(service);
  46                 if (reader == null) {
  47                     this.log.error("Cannot register the LogListener because "
  48                             + "cannot retrieve LogReaderService");
  49                 }
  50                 reader.addLogListener(this.listener);
  51                 // Now lets walk all the exiting messages
  52                 Enumeration<LogEntry> entries = reader.getLog();
  53                 if (entries != null) {
  54                     while (entries.hasMoreElements()) {
  55                         LogEntry entry = (LogEntry) entries.nextElement();
  56                         this.listener.logged(entry);
  57                     }
  58                 }
  59
  60                 /*
  61                  * Install the default exception handler so that the uncaught
  62                  * exceptions are handled by our customized handler. This new
  63                  * handler will display the exceptions to OSGI console as well
  64                  * as log to file.
  65                  */
  66                 Thread.setDefaultUncaughtExceptionHandler(new org.opendaylight.
  67                         controller.logging.bridge.internal.UncaughtExceptionHandler());
  68
  69                 /*
  70                  * Install the Shutdown handler. This will intercept SIGTERM signal and
  71                  * close the system bundle. This allows for a graceful  closing of OSGI
  72                  * framework.
  73                  */
  74
  75                 Runtime.getRuntime().addShutdownHook(new shutdownHandler(context));
  76             } else {
  77                 this.log.error("Cannot register the LogListener because "
  78                         + "cannot retrieve LogReaderService");
  79             }
  80         } else {
  81             System.err
  82                     .println("Could not initialize the logging bridge subsytem");
  83         }
  84     }
  85
  86     @Override
  87     public void stop(BundleContext context) {
  88         ServiceReference service = null;
  89         service = context.getServiceReference(LogReaderService.class.getName());
  90         if (service != null) {
  91             LogReaderService reader = (LogReaderService) service;
  92             reader.removeLogListener(this.listener);
  93         }
  94
  95         this.listener = null;
  96         this.log = null;
  97     }
  98
  99     private class shutdownHandler extends Thread {
 100         BundleContext bundlecontext;
 101         public shutdownHandler(BundleContext ctxt) {
 102                 this.bundlecontext = ctxt;
 103         }
 104
 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             }
 112         }
 113     }
 114
 115 }