Examples of org.osgi.service.log.LogService

org.osgi.service.log.LogService
Provides methods for bundles to write messages to the log.
{@code LogService} methods are provided to log messages; optionally with a{@code ServiceReference} object or an exception.
Bundles must log messages in the OSGi environment with a severity level according to the following hierarchy:
1. {@link #LOG_ERROR}
2. {@link #LOG_WARNING}
3. {@link #LOG_INFO}
4. {@link #LOG_DEBUG}
@ThreadSafe @noimplement @author $Id: dc7a9f634f0f0ccf9bd224e12d15d092861efc0e $

     *            <code>null</code>.
     * @param t The <code>Throwable</code> to log along with the message. This
     *            may be <code>null</code>.
     */
    protected void log(int level, String message, Throwable t) {
        LogService log = this.log;
        if (log != null) {
            log.log(level, message, t);
        } else {
            System.err.print(level + " - " + message);
            if (t != null) {
                t.printStackTrace(System.err);
            }

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    protected void log(int level, String message) {
        this.log(level, message, null);
    }


    protected void log(int level, String message, Throwable t) {
        LogService log = this.log;
        if (log != null) {
            if (componentContext != null) {
                log.log(componentContext.getServiceReference(), level, message,
                    t);
            } else {
                log.log(level, message, t);
            }
        }
    }

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            this.registerMimeType(parts[0], extensions);
        }
    }


    private void log(int level, String message, Throwable t) {
        LogService log = this.logService;
        if (log != null) {
            log.log(level, message, t);
        } else {
            PrintStream out = (level == LogService.LOG_ERROR)
                    ? System.err
                    : System.out;
            out.println(message);

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    //---------- Logging Support ----------------------------------------------
    // log to stdout or use LogService


    public static void log( int level, String message )
    {
        LogService log = ( LogService ) INSTANCE.logService.getService();
        if ( log == null )
        {
            _log( null, level, message, null );
        }
        else
        {
            log.log( level, message );
        }
    }

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    }




    public static void log( int level, String message, Throwable exception )
    {
        LogService log = ( LogService ) INSTANCE.logService.getService();
        if ( log == null )
        {
            _log( null, level, message, exception );
        }
        else
        {
            log.log( level, message, exception );
        }
    }

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    }




    public static void log( ServiceReference sr, int level, String message )
    {
        LogService log = ( LogService ) INSTANCE.logService.getService();
        if ( log == null )
        {
            _log( sr, level, message, null );
        }
        else
        {
            log.log( sr, level, message );
        }
    }

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    }




    public static void log( ServiceReference sr, int level, String message, Throwable exception )
    {
        LogService log = ( LogService ) INSTANCE.logService.getService();
        if ( log == null )
        {
            _log( sr, level, message, exception );
        }
        else
        {
            log.log( sr, level, message, exception );
        }
    }

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        this.tracker.close();
    }


    public void log(ServiceReference ref, int level, String message, Throwable cause)
    {
        LogService log = (LogService)this.tracker.getService();
        if (log != null) {
            log.log(ref, level, message, cause);
        } else {
            this.consoleLogger.log(ref, level, message, cause);
        }
    }

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 */
public class DropAllBundlesCommand extends Command {


    protected void doExecute(DeploymentSessionImpl session) throws Exception {
        AbstractDeploymentPackage target = session.getTargetAbstractDeploymentPackage();
        LogService log = session.getLog();


        BundleInfoImpl[] orderedTargetBundles = target.getOrderedBundleInfos();
        for (int i = orderedTargetBundles.length - 1; i >= 0; i--) {
            BundleInfoImpl bundleInfo = orderedTargetBundles[i];
            // stale bundle, save a copy for rolling back and uninstall it
            String symbolicName = bundleInfo.getSymbolicName();
            try {
                Bundle bundle = target.getBundle(symbolicName);
                if (bundle != null) {
                    bundle.uninstall();
                    addRollback(new InstallBundleRunnable(bundle, target, log));
                }
            }
            catch (Exception be) {
                log.log(LogService.LOG_WARNING, "Bundle '" + symbolicName + "' could not be uninstalled", be);
            }
        }
    }

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    public static void log( int level, Bundle bundle, String message, Throwable ex )
    {
        if ( isLogEnabled( level ) )
        {
            ServiceTracker<LogService, LogService> t = m_logService;
            LogService logger = ( t != null ) ? t.getService() : null;
            if ( logger == null )
            {
                // output depending on level
                PrintStream out = ( level == LogService.LOG_ERROR ) ? System.err : System.out;


                // level as a string
                StringBuffer buf = new StringBuffer();
                switch ( level )
                {
                    case ( LogService.LOG_DEBUG     ):
                        buf.append( "DEBUG: " );
                        break;
                    case ( LogService.LOG_INFO     ):
                        buf.append( "INFO : " );
                        break;
                    case ( LogService.LOG_WARNING     ):
                        buf.append( "WARN : " );
                        break;
                    case ( LogService.LOG_ERROR     ):
                        buf.append( "ERROR: " );
                        break;
                    default:
                        buf.append( "UNK  : " );
                        break;
                }


                // bundle information
                if ( bundle != null )
                {
                    buf.append( bundle.getSymbolicName() );
                    buf.append( " (" );
                    buf.append( bundle.getBundleId() );
                    buf.append( "): " );
                }


                // the message
                buf.append( message );


                // keep the message and the stacktrace together
                synchronized ( out)
                {
                    out.println( buf );
                    if ( ex != null )
                    {
                        ex.printStackTrace( out );
                    }
                }
            }
            else
            {
                logger.log( level, message, ex );
            }
        }
    }

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