org.ops4j.pax.logging.OSGIPaxLoggingManager Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of pax-logging-api Show documentation

The Pax Logging API Library is to allow for the Pax Logging Service to be reloaded without stopping the many dependent bundles. It also contains the OSGi Log Service API and the Knopflerfish Log API.

There is a newer version: 2.2.7

Show newest version

/*
 * Copyright 2006 Niclas Hedhman.
 *
 * Licensed  under the  Apache License,  Version 2.0  (the "License");
 * you may not use  this file  except in  compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed  under the  License is distributed on an "AS IS" BASIS,
 * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
 * implied.
 *
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */
package org.ops4j.pax.logging;

import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.ops4j.pax.logging.internal.BundleHelper;
import org.ops4j.pax.logging.internal.TrackingLogger;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTracker;

public class OSGIPaxLoggingManager extends ServiceTracker
        implements PaxLoggingManager
{

    private PaxLoggingService m_service;

    private BundleContext m_context;

    private Map m_loggers;

    private ServiceReference m_logServiceRef;

    public OSGIPaxLoggingManager(BundleContext context)
    {
        super(context, PaxLoggingService.class.getName(), null);
        m_loggers = new HashMap();
        m_context = context;
        // retrieve the service if any exist at this point.
        ServiceReference ref = context.getServiceReference(PaxLoggingService.class.getName());
        if (ref != null)
        {
            m_service = (PaxLoggingService) context.getService(ref);
        }
    }

    public Object addingService(ServiceReference reference)
    {
        m_logServiceRef = reference;
        m_service = (PaxLoggingService) m_context.getService(reference);
        synchronized (m_loggers) {
            Collection values = m_loggers.values();
            Iterator iterator = values.iterator();
            while (iterator.hasNext())
            {
                TrackingLogger logger = (TrackingLogger) iterator.next();
                logger.added(m_service);
            }
        }
        return m_service;
    }

    public void removedService(ServiceReference reference, Object service)
    {
        m_service = null;
        if (m_logServiceRef == null) {
            m_context.ungetService(m_logServiceRef);
            m_logServiceRef = null;
        }

        synchronized (m_loggers) {
            Collection values = m_loggers.values();
            Iterator iterator = values.iterator();
            while (iterator.hasNext())
            {
                TrackingLogger logger = (TrackingLogger) iterator.next();
                logger.removed();
            }
        }
    }

    public PaxLogger getLogger(String category, String fqcn)
    {
        if (fqcn == null)
        {
            fqcn = PaxLogger.class.getName();
        }
        Bundle bundle = BundleHelper.getCallerBundle(m_context.getBundle());
        String key = fqcn + "#" + category + "#" + (bundle != null ? Long.toString(bundle.getBundleId()) : "0");
        synchronized (m_loggers) {
            TrackingLogger logger = (TrackingLogger) m_loggers.get(key);
            if (logger == null)
            {
                logger = new TrackingLogger(m_service, category, bundle, fqcn);
                m_loggers.put(key, logger);
            }
            return logger;
        }
    }

    public PaxLoggingService getPaxLoggingService()
    {
        return m_service;
    }

    public void dispose()
    {
        if (m_logServiceRef != null)
        {
            m_context.ungetService(m_logServiceRef);
            m_logServiceRef = null;
        }
        m_context = null;
    }

    public Bundle getBundle()
    {
        return m_context.getBundle();
    }
}