The version of Apache log4j used by SoundHelix.

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PRE_UGLI_MOVE :: src / java / org / apache / log4j / net /

XMLSocketNode.java

/*
 * Copyright 1999,2004 The Apache Software Foundation.
 * 
 * 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.apache.log4j.net;

import org.apache.log4j.*;
import org.apache.log4j.helpers.Constants;
import org.apache.log4j.plugins.Receiver;
import org.apache.log4j.spi.*;

import java.io.IOException;
import java.io.InputStream;

import java.net.Socket;

import java.util.Iterator;
import java.util.List;


/**
   Read {@link LoggingEvent} objects sent from a remote client using XML over
   Sockets (TCP). These logging events are logged according to local
   policy, as if they were generated locally.

   <p>For example, the socket node might decide to log events to a
   local file and also resent them to a second socket node.

    @author  Scott Deboy <sdeboy@apache.org>;

    @since 0.8.4
*/
public class XMLSocketNode implements Runnable {
  Logger logger = Logger.getLogger(XMLSocketNode.class);
  Socket socket;
  LoggerRepository hierarchy;
  Receiver receiver;
  Decoder decoder;
  SocketNodeEventListener listener;
  
  /**
    Constructor for socket and logger repository. */
  public XMLSocketNode(
    String decoder, Socket socket, LoggerRepository hierarchy) {
    try {
      Class c = Class.forName(decoder);
      Object o = c.newInstance();

      if (o instanceof Decoder) {
        this.decoder = (Decoder) o;
      }
    } catch (ClassNotFoundException cnfe) {
      logger.warn("Unable to find decoder", cnfe);
    } catch (IllegalAccessException iae) {
      logger.warn("Unable to construct decoder", iae);
    } catch (InstantiationException ie) {
      logger.warn("Unable to construct decoder", ie);
    }

    this.socket = socket;
    this.hierarchy = hierarchy;
  }

  /**
    Constructor for socket and reciever. */
  public XMLSocketNode(String decoder, Socket socket, Receiver receiver) {
    try {
      Class c = Class.forName(decoder);
      Object o = c.newInstance();

      if (o instanceof Decoder) {
        this.decoder = (Decoder) o;
      }
    } catch (ClassNotFoundException cnfe) {
      logger.warn("Unable to find decoder", cnfe);
    } catch (IllegalAccessException iae) {
      logger.warn("Unable to construct decoder", iae);
    } catch (InstantiationException ie) {
      logger.warn("Unable to construct decoder", ie);
    }

    this.socket = socket;
    this.receiver = receiver;
  }

  /**
    Set the event listener on this node. */
  public void setListener(SocketNodeEventListener _listener) {
    listener = _listener;
  }

    public void run() {
    Logger remoteLogger;
    Exception listenerException = null;
    InputStream is = null;

    if ((this.receiver == null) || (this.decoder == null)) {
      is = null;
      listenerException =
        new Exception(
          "No receiver or decoder provided.  Cannot process xml socket events");
      logger.error(
        "Exception constructing XML Socket Receiver", listenerException);
    }

    try {
      is = socket.getInputStream();
    } catch (Exception e) {
      is = null;
      listenerException = e;
      logger.error("Exception opening ObjectInputStream to " + socket, e);
    }

    if (is != null) {
      String remoteInfo =
        socket.getInetAddress().getHostName() + ":" + socket.getPort();

      try {
            //read data from the socket
            //it's up to the individual decoder to handle incomplete event data
            while (true) {
                byte[] b=new byte[1024];
                int length = is.read(b);
                if (length == -1) {
                	logger.info("no bytes read from stream - closing connection.");
                	break;
                }
                List v= decoder.decodeEvents(new String(b, 0, length));

            if (v != null) {
              Iterator iter = v.iterator();

              while (iter.hasNext()) {
                LoggingEvent e = (LoggingEvent) iter.next();
                //if machinename property was not set (the case if properties
                //not supported by the DTD), use remoteinfo as machine name
                if (e.getProperty(Constants.HOSTNAME_KEY)==null) {
                	e.setProperty(Constants.HOSTNAME_KEY, remoteInfo);
                }

                // store the known remote info in an event property
                e.setProperty("log4j.remoteSourceInfo", remoteInfo);

                // if configured with a receiver, tell it to post the event
                if (receiver != null) {
                  receiver.doPost(e);

                  // else post it via the hierarchy
                } else {
                  // get a logger from the hierarchy. The name of the logger
                  // is taken to be the name contained in the event.
                  remoteLogger = hierarchy.getLogger(e.getLoggerName());

                  //event.logger = remoteLogger;
                  // apply the logger-level filter
                  if (
                    e.getLevel().isGreaterOrEqual(
                        remoteLogger.getEffectiveLevel())) {
                    // finally log the event as if was generated locally
                    remoteLogger.callAppenders(e);
                  }
                }
                }
              }

          }
      } catch (java.io.EOFException e) {
        logger.info("Caught java.io.EOFException closing connection.");
        listenerException = e;
      } catch (java.net.SocketException e) {
        logger.info("Caught java.net.SocketException closing connection.");
        listenerException = e;
      } catch (IOException e) {
        logger.info("Caught java.io.IOException: " + e);
        logger.info("Closing connection.");
        listenerException = e;
      } catch (Exception e) {
        logger.error("Unexpected exception. Closing connection.", e);
        listenerException = e;
      }
    }

    // close the socket
    try {
      if (is != null) {
        is.close();
      }
    } catch (Exception e) {
		//logger.info("Could not close connection.", e);
    }

    // send event to listener, if configured
    if (listener != null) {
      listener.socketClosedEvent(listenerException);
    }
  }
}
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