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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17
    18  package org.apache.log4j.net;
    19
    20  import java.net.Socket;
    21  import java.io.IOException;
    22  import java.io.ObjectInputStream;
    23  import java.io.BufferedInputStream;
    24
    25
    26  import org.apache.log4j.*;
    27  import org.apache.log4j.spi.*;
    28
    29  // Contributors:  Moses Hohman <mmhohman@rainbow.uchicago.edu>
    30
    31  /***
    32     Read {@link LoggingEvent} objects sent from a remote client using
    33     Sockets (TCP). These logging events are logged according to local
    34     policy, as if they were generated locally.
    35
    36     <p>For example, the socket node might decide to log events to a
    37     local file and also resent them to a second socket node.
    38
    39      @author  Ceki G&uuml;lc&uuml;
    40
    41      @since 0.8.4
    42  */
    43  public class SocketNode implements Runnable {
    44
    45    Socket socket;
    46    LoggerRepository hierarchy;
    47    ObjectInputStream ois;
    48
    49    static Logger logger = Logger.getLogger(SocketNode.class);
    50
    51    public SocketNode(Socket socket, LoggerRepository hierarchy) {
    52      this.socket = socket;
    53      this.hierarchy = hierarchy;
    54      try {
    55        ois = new ObjectInputStream(
    56                           new BufferedInputStream(socket.getInputStream()));
    57      }
    58      catch(Exception e) {
    59        logger.error("Could not open ObjectInputStream to "+socket, e);
    60      }
    61    }
    62
    63    //public
    64    //void finalize() {
    65    //System.err.println("-------------------------Finalize called");
    66    // System.err.flush();
    67    //}
    68
    69    public void run() {
    70      LoggingEvent event;
    71      Logger remoteLogger;
    72
    73      try {
    74        if (ois != null) {
    75            while(true) {
    76  	        // read an event from the wire
    77  	        event = (LoggingEvent) ois.readObject();
    78  	        // get a logger from the hierarchy. The name of the logger is taken to be the name contained in the event.
    79  	        remoteLogger = hierarchy.getLogger(event.getLoggerName());
    80  	        //event.logger = remoteLogger;
    81  	        // apply the logger-level filter
    82  	        if(event.getLevel().isGreaterOrEqual(remoteLogger.getEffectiveLevel())) {
    83  	        // finally log the event as if was generated locally
    84  	        remoteLogger.callAppenders(event);
    85  	      }
    86          }
    87        }
    88      } catch(java.io.EOFException e) {
    89        logger.info("Caught java.io.EOFException closing conneciton.");
    90      } catch(java.net.SocketException e) {
    91        logger.info("Caught java.net.SocketException closing conneciton.");
    92      } catch(IOException e) {
    93        logger.info("Caught java.io.IOException: "+e);
    94        logger.info("Closing connection.");
    95      } catch(Exception e) {
    96        logger.error("Unexpected exception. Closing conneciton.", e);
    97      } finally {
    98        if (ois != null) {
    99           try {
    100             ois.close();
    101          } catch(Exception e) {
    102             logger.info("Could not close connection.", e);
    103          }
    104       }
    105       if (socket != null) {
    106         try {
    107           socket.close();
    108         } catch(IOException ex) {
    109         }
    110       }
    111     }
    112   }
    113 }