SocketNode xref

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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.io.BufferedInputStream;
    21  import java.io.IOException;
    22  import java.io.InterruptedIOException;
    23  import java.io.ObjectInputStream;
    24  import java.net.Socket;
    25
    26  import org.apache.log4j.Logger;
    27  import org.apache.log4j.spi.LoggerRepository;
    28  import org.apache.log4j.spi.LoggingEvent;
    29
    30  // Contributors:  Moses Hohman <mmhohman@rainbow.uchicago.edu>
    31
    32  /**
    33     Read {@link LoggingEvent} objects sent from a remote client using
    34     Sockets (TCP). These logging events are logged according to local
    35     policy, as if they were generated locally.
    36
    37     <p>For example, the socket node might decide to log events to a
    38     local file and also resent them to a second socket node.
    39
    40      @author  Ceki G&uuml;lc&uuml;
    41
    42      @since 0.8.4
    43  */
    44  public class SocketNode implements Runnable {
    45
    46    Socket socket;
    47    LoggerRepository hierarchy;
    48    ObjectInputStream ois;
    49
    50    static Logger logger = Logger.getLogger(SocketNode.class);
    51
    52    public SocketNode(Socket socket, LoggerRepository hierarchy) {
    53      this.socket = socket;
    54      this.hierarchy = hierarchy;
    55      try {
    56        ois = new ObjectInputStream(
    57                           new BufferedInputStream(socket.getInputStream()));
    58      } catch(InterruptedIOException e) {
    59        Thread.currentThread().interrupt();
    60        logger.error("Could not open ObjectInputStream to "+socket, e);
    61      } catch(IOException e) {
    62        logger.error("Could not open ObjectInputStream to "+socket, e);
    63      } catch(RuntimeException e) {
    64        logger.error("Could not open ObjectInputStream to "+socket, e);
    65      }
    66    }
    67
    68    //public
    69    //void finalize() {
    70    //System.err.println("-------------------------Finalize called");
    71    // System.err.flush();
    72    //}
    73
    74    public void run() {
    75      LoggingEvent event;
    76      Logger remoteLogger;
    77
    78      try {
    79        if (ois != null) {
    80            while(true) {
    81  	        // read an event from the wire
    82  	        event = (LoggingEvent) ois.readObject();
    83  	        // get a logger from the hierarchy. The name of the logger is taken to be the name contained in the event.
    84  	        remoteLogger = hierarchy.getLogger(event.getLoggerName());
    85  	        //event.logger = remoteLogger;
    86  	        // apply the logger-level filter
    87  	        if(event.getLevel().isGreaterOrEqual(remoteLogger.getEffectiveLevel())) {
    88  	        // finally log the event as if was generated locally
    89  	        remoteLogger.callAppenders(event);
    90  	      }
    91          }
    92        }
    93      } catch(java.io.EOFException e) {
    94        logger.info("Caught java.io.EOFException closing conneciton.");
    95      } catch(java.net.SocketException e) {
    96        logger.info("Caught java.net.SocketException closing conneciton.");
    97      } catch(InterruptedIOException e) {
    98        Thread.currentThread().interrupt();
    99        logger.info("Caught java.io.InterruptedIOException: "+e);
    100       logger.info("Closing connection.");
    101     } catch(IOException e) {
    102       logger.info("Caught java.io.IOException: "+e);
    103       logger.info("Closing connection.");
    104     } catch(Exception e) {
    105       logger.error("Unexpected exception. Closing conneciton.", e);
    106     } finally {
    107       if (ois != null) {
    108          try {
    109             ois.close();
    110          } catch(Exception e) {
    111             logger.info("Could not close connection.", e);
    112          }
    113       }
    114       if (socket != null) {
    115         try {
    116           socket.close();
    117         } catch(InterruptedIOException e) {
    118             Thread.currentThread().interrupt();
    119         } catch(IOException ex) {
    120         }
    121       }
    122     }
    123   }
    124 }