<commit_before>/* 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.felix.framework;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.osgi.framework.*;

/**
 * <p>
 * This class mimics the standard OSGi <tt>LogService</tt> interface. An
 * instance of this class is used by the framework for all logging. By default
 * this class logs messages to standard out. The log level can be set to
 * control the amount of logging performed, where a higher number results in
 * more logging. A log level of zero turns off logging completely.
 * </p>
 * <p>
 * The log levels match those specified in the OSGi Log Service (i.e., 1 = error,
 * 2 = warning, 3 = information, and 4 = debug). The default value is 1.
 * </p>
 * <p>
 * This class also uses the System Bundle's context to track log services
 * and will use the highest ranking log service, if present, as a back end
 * instead of printing to standard out. The class uses reflection to invoking
 * the log service's method to avoid a dependency on the log interface.
 * </p>
**/
public class Logger implements ServiceListener
{
    public static final int LOG_ERROR = 1;
    public static final int LOG_WARNING = 2;
    public static final int LOG_INFO = 3;
    public static final int LOG_DEBUG = 4;

    private int m_logLevel = 1;
    private BundleContext m_context = null;

    private final static int LOGGER_OBJECT_IDX = 0;
    private final static int LOGGER_METHOD_IDX = 1;    
    private ServiceReference m_logRef = null;
    private Object[] m_logger = null;

    public Logger(int logLevel)
    {
        m_logLevel = logLevel;
    }

    public Logger(String s)
    {
        s = (s == null) ? "1" : s;
        try
        {
            m_logLevel = Integer.parseInt(s);
        }
        catch (NumberFormatException ex)
        {
            // Default to 1.
        }
    }

    protected void setSystemBundleContext(BundleContext context)
    {
        m_context = context;
        startListeningForLogService();
    }

    public void log(int level, String msg)
    {
        _log(null, level, msg, null);
    }

    public void log(int level, String msg, Throwable ex)
    {
        _log(null, level, msg, ex);
    }

    public void log(ServiceReference sr, int level, String msg)
    {
        _log(sr, level, msg, null);
    }

    public void log(ServiceReference sr, int level, String msg, Throwable ex)
    {
        _log(sr, level, msg, ex);
    }

    private void _log(ServiceReference sr, int level, String msg, Throwable throwable)
    {
        // Save our own copy just in case it changes. We could try to do
        // more conservative locking here, but let's be optimistic.
        Object[] logger = m_logger;

        if (logger != null)
        {
            _logReflectively(logger, sr, level, msg, throwable);
        }
        else
        {
            String s = (sr == null) ? null : "SvcRef " + sr;
            s = (s == null) ? msg : s + " " + msg;
            s = (throwable == null) ? s : s + " (" + throwable + ")";
            switch (level)
            {
                case LOG_DEBUG:
                    if (m_logLevel >= LOG_DEBUG)
                    {
                        System.out.println("DEBUG: " + s);
                    }
                    break;
                case LOG_ERROR:
                    if (m_logLevel >= LOG_ERROR)
                    {
                        System.out.println("ERROR: " + s);
                        if (throwable != null)
                        {
                            if ((throwable instanceof BundleException) &&
                                (((BundleException) throwable).getNestedException() != null))
                            {
                                throwable = ((BundleException) throwable).getNestedException();
                            }
                            throwable.printStackTrace();
                        }
                    }
                    break;
                case LOG_INFO:
                    if (m_logLevel >= LOG_INFO)
                    {
                        System.out.println("INFO: " + s);
                    }
                    break;
                case LOG_WARNING:
                    if (m_logLevel >= LOG_WARNING)
                    {
                        System.out.println("WARNING: " + s);
                    }
                    break;
                default:
                    System.out.println("UNKNOWN[" + level + "]: " + s);
            }
        }
    }

    private void _logReflectively(
        Object[] logger, ServiceReference sr, int level, String msg, Throwable throwable)
    {
        if (logger != null)
        {
            Object[] params = {
                sr, new Integer(level), msg, throwable
            };
            try
            {
                ((Method) logger[LOGGER_METHOD_IDX]).invoke(logger[LOGGER_OBJECT_IDX], params);
            }
            catch (InvocationTargetException ex)
            {
                System.err.println("Logger: " + ex);
            }
            catch (IllegalAccessException ex)
            {
                System.err.println("Logger: " + ex);
            }
        }
    }

    /**
     * This method is called when the system bundle context is set;
     * it simply adds a service listener so that the system bundle can track
     * log services to be used as the back end of the logging mechanism. It also
     * attempts to get an existing log service, if present, but in general
     * there will never be a log service present since the system bundle is
     * started before every other bundle.
    **/
    private synchronized void startListeningForLogService()
    {
        // Add a service listener for log services.
        try
        {
            m_context.addServiceListener(
                this, "(objectClass=org.osgi.service.log.LogService)");
        }
        catch (InvalidSyntaxException ex) {
            // This will never happen since the filter is hard coded.
        }
        // Try to get an existing log service.
        m_logRef = m_context.getServiceReference("org.osgi.service.log.LogService");
        // Get the service object if available and set it in the logger.
        if (m_logRef != null)
        {
            setLogger(m_context.getService(m_logRef));
        }
    }

    /**
     * This method implements the callback for the ServiceListener interface.
     * It is public as a byproduct of implementing the interface and should
     * not be called directly. This method tracks run-time changes to log
     * service availability. If the log service being used by the framework's
     * logging mechanism goes away, then this will try to find an alternative.
     * If a higher ranking log service is registered, then this will switch
     * to the higher ranking log service.
    **/
    public synchronized void serviceChanged(ServiceEvent event)
    {
        // If no logger is in use, then grab this one.
        if ((event.getType() == ServiceEvent.REGISTERED) && (m_logRef == null))
        {
            m_logRef = event.getServiceReference();
            // Get the service object and set it in the logger.
            setLogger(m_context.getService(m_logRef));
        }
        // If a logger is in use, but this one has a higher ranking, then swap
        // it for the existing logger.
        else if ((event.getType() == ServiceEvent.REGISTERED) && (m_logRef != null))
        {
            ServiceReference ref =
                m_context.getServiceReference("org.osgi.service.log.LogService");
            if (!ref.equals(m_logRef))
            {
                m_context.ungetService(m_logRef);
                m_logRef = ref;
                setLogger(m_context.getService(m_logRef));
            }
            
        }
        // If the current logger is going away, release it and try to
        // find another one.
        else if ((event.getType() == ServiceEvent.UNREGISTERING) &&
            m_logRef.equals(event.getServiceReference()))
        {
            // Unget the service object.
            m_context.ungetService(m_logRef);
            // Try to get an existing log service.
            m_logRef = m_context.getServiceReference(
                "org.osgi.service.log.LogService");
            // Get the service object if available and set it in the logger.
            if (m_logRef != null)
            {
                setLogger(m_context.getService(m_logRef));
            }
            else
            {
                setLogger(null);
            }
        }
    }

    /**
     * This method sets the new log service object. It also caches the method to
     * invoke. The service object and method are stored in array to optimistically
     * eliminate the need to locking when logging.
    **/
    private void setLogger(Object logObj)
    {
        if (logObj == null)
        {
            m_logger = null;
        }
        else
        {
            Class[] formalParams = {
                ServiceReference.class,
                Integer.TYPE,
                String.class,
                Throwable.class
            };

            try
            {
                Method logMethod = logObj.getClass().getMethod("log", formalParams);
                logMethod.setAccessible(true);
                m_logger = new Object[] { logObj, logMethod };
            }
            catch (NoSuchMethodException ex)
            {
                System.err.println("Logger: " + ex);
                m_logger = null;
            }
        }
    }
}<commit_msg>Modified logger so that log level is obeyed whether a log service is used or not.<commit_after>/* 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.felix.framework;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.osgi.framework.*;

/**
 * <p>
 * This class mimics the standard OSGi <tt>LogService</tt> interface. An
 * instance of this class is used by the framework for all logging. By default
 * this class logs messages to standard out. The log level can be set to
 * control the amount of logging performed, where a higher number results in
 * more logging. A log level of zero turns off logging completely.
 * </p>
 * <p>
 * The log levels match those specified in the OSGi Log Service (i.e., 1 = error,
 * 2 = warning, 3 = information, and 4 = debug). The default value is 1.
 * </p>
 * <p>
 * This class also uses the System Bundle's context to track log services
 * and will use the highest ranking log service, if present, as a back end
 * instead of printing to standard out. The class uses reflection to invoking
 * the log service's method to avoid a dependency on the log interface.
 * </p>
**/
public class Logger implements ServiceListener
{
    public static final int LOG_ERROR = 1;
    public static final int LOG_WARNING = 2;
    public static final int LOG_INFO = 3;
    public static final int LOG_DEBUG = 4;

    private int m_logLevel = 1;
    private BundleContext m_context = null;

    private final static int LOGGER_OBJECT_IDX = 0;
    private final static int LOGGER_METHOD_IDX = 1;    
    private ServiceReference m_logRef = null;
    private Object[] m_logger = null;

    public Logger(int logLevel)
    {
        m_logLevel = logLevel;
    }

    public Logger(String s)
    {
        s = (s == null) ? "1" : s;
        try
        {
            m_logLevel = Integer.parseInt(s);
        }
        catch (NumberFormatException ex)
        {
            // Default to 1.
        }
    }

    protected void setSystemBundleContext(BundleContext context)
    {
        m_context = context;
        startListeningForLogService();
    }

    public void log(int level, String msg)
    {
        _log(null, level, msg, null);
    }

    public void log(int level, String msg, Throwable ex)
    {
        _log(null, level, msg, ex);
    }

    public void log(ServiceReference sr, int level, String msg)
    {
        _log(sr, level, msg, null);
    }

    public void log(ServiceReference sr, int level, String msg, Throwable ex)
    {
        _log(sr, level, msg, ex);
    }

    private void _log(ServiceReference sr, int level, String msg, Throwable throwable)
    {
        // Save our own copy just in case it changes. We could try to do
        // more conservative locking here, but let's be optimistic.
        Object[] logger = m_logger;

        if (m_logLevel >= level)
        {
            if (logger != null)
            {
                _logReflectively(logger, sr, level, msg, throwable);
            }
            else
            {
                String s = (sr == null) ? null : "SvcRef " + sr;
                s = (s == null) ? msg : s + " " + msg;
                s = (throwable == null) ? s : s + " (" + throwable + ")";
                switch (level)
                {
                    case LOG_DEBUG:
                        System.out.println("DEBUG: " + s);
                        break;
                    case LOG_ERROR:
                        System.out.println("ERROR: " + s);
                        if (throwable != null)
                        {
                            if ((throwable instanceof BundleException) &&
                                (((BundleException) throwable).getNestedException() != null))
                            {
                                throwable = ((BundleException) throwable).getNestedException();
                            }
                            throwable.printStackTrace();
                        }
                        break;
                    case LOG_INFO:
                        System.out.println("INFO: " + s);
                        break;
                    case LOG_WARNING:
                        System.out.println("WARNING: " + s);
                        break;
                    default:
                        System.out.println("UNKNOWN[" + level + "]: " + s);
                }
            }
        }
    }

    private void _logReflectively(
        Object[] logger, ServiceReference sr, int level, String msg, Throwable throwable)
    {
        if (logger != null)
        {
            Object[] params = {
                sr, new Integer(level), msg, throwable
            };
            try
            {
                ((Method) logger[LOGGER_METHOD_IDX]).invoke(logger[LOGGER_OBJECT_IDX], params);
            }
            catch (InvocationTargetException ex)
            {
                System.err.println("Logger: " + ex);
            }
            catch (IllegalAccessException ex)
            {
                System.err.println("Logger: " + ex);
            }
        }
    }

    /**
     * This method is called when the system bundle context is set;
     * it simply adds a service listener so that the system bundle can track
     * log services to be used as the back end of the logging mechanism. It also
     * attempts to get an existing log service, if present, but in general
     * there will never be a log service present since the system bundle is
     * started before every other bundle.
    **/
    private synchronized void startListeningForLogService()
    {
        // Add a service listener for log services.
        try
        {
            m_context.addServiceListener(
                this, "(objectClass=org.osgi.service.log.LogService)");
        }
        catch (InvalidSyntaxException ex) {
            // This will never happen since the filter is hard coded.
        }
        // Try to get an existing log service.
        m_logRef = m_context.getServiceReference("org.osgi.service.log.LogService");
        // Get the service object if available and set it in the logger.
        if (m_logRef != null)
        {
            setLogger(m_context.getService(m_logRef));
        }
    }

    /**
     * This method implements the callback for the ServiceListener interface.
     * It is public as a byproduct of implementing the interface and should
     * not be called directly. This method tracks run-time changes to log
     * service availability. If the log service being used by the framework's
     * logging mechanism goes away, then this will try to find an alternative.
     * If a higher ranking log service is registered, then this will switch
     * to the higher ranking log service.
    **/
    public synchronized void serviceChanged(ServiceEvent event)
    {
        // If no logger is in use, then grab this one.
        if ((event.getType() == ServiceEvent.REGISTERED) && (m_logRef == null))
        {
            m_logRef = event.getServiceReference();
            // Get the service object and set it in the logger.
            setLogger(m_context.getService(m_logRef));
        }
        // If a logger is in use, but this one has a higher ranking, then swap
        // it for the existing logger.
        else if ((event.getType() == ServiceEvent.REGISTERED) && (m_logRef != null))
        {
            ServiceReference ref =
                m_context.getServiceReference("org.osgi.service.log.LogService");
            if (!ref.equals(m_logRef))
            {
                m_context.ungetService(m_logRef);
                m_logRef = ref;
                setLogger(m_context.getService(m_logRef));
            }
            
        }
        // If the current logger is going away, release it and try to
        // find another one.
        else if ((event.getType() == ServiceEvent.UNREGISTERING) &&
            m_logRef.equals(event.getServiceReference()))
        {
            // Unget the service object.
            m_context.ungetService(m_logRef);
            // Try to get an existing log service.
            m_logRef = m_context.getServiceReference(
                "org.osgi.service.log.LogService");
            // Get the service object if available and set it in the logger.
            if (m_logRef != null)
            {
                setLogger(m_context.getService(m_logRef));
            }
            else
            {
                setLogger(null);
            }
        }
    }

    /**
     * This method sets the new log service object. It also caches the method to
     * invoke. The service object and method are stored in array to optimistically
     * eliminate the need to locking when logging.
    **/
    private void setLogger(Object logObj)
    {
        if (logObj == null)
        {
            m_logger = null;
        }
        else
        {
            Class[] formalParams = {
                ServiceReference.class,
                Integer.TYPE,
                String.class,
                Throwable.class
            };

            try
            {
                Method logMethod = logObj.getClass().getMethod("log", formalParams);
                logMethod.setAccessible(true);
                m_logger = new Object[] { logObj, logMethod };
            }
            catch (NoSuchMethodException ex)
            {
                System.err.println("Logger: " + ex);
                m_logger = null;
            }
        }
    }
}
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