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/*
 * 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.log4j.net;

import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.Socket;

import org.apache.log4j.Logger;
import org.apache.log4j.spi.LoggerRepository;
import org.apache.log4j.spi.LoggingEvent;

// Contributors:  Moses Hohman 

/**
 * Read {@link LoggingEvent} objects sent from a remote client using Sockets (TCP). These logging events are logged
 * according to local policy, as if they were generated locally.
 *
 * 
 * For example, the socket node might decide to log events to a local file and also resent them to a second socket
 * node.
 *
 * @author Ceki Gülcü
 * @since 0.8.4
 */
public class SocketNode implements Runnable {

    Socket socket;
    LoggerRepository hierarchy;
    HardenedLoggingEventInputStream ois;

    static Logger logger = Logger.getLogger(SocketNode.class);

    public SocketNode(Socket socket, LoggerRepository hierarchy) {
        this.socket = socket;
        this.hierarchy = hierarchy;
        try {
            ois = new HardenedLoggingEventInputStream((socket.getInputStream()));
        } catch (InterruptedIOException e) {
            Thread.currentThread().interrupt();
            logger.error("Could not open ObjectInputStream to " + socket, e);
        } catch (IOException e) {
            logger.error("Could not open ObjectInputStream to " + socket, e);
        } catch (RuntimeException e) {
            logger.error("Could not open ObjectInputStream to " + socket, e);
        }
    }

    // public
    // void finalize() {
    // System.err.println("-------------------------Finalize called");
    // System.err.flush();
    // }

    public void run() {
        LoggingEvent event;
        Logger remoteLogger;

        try {
            if (ois != null) {
                while (true) {
                    // read an event from the wire
                    event = (LoggingEvent) ois.readObject();
                    // get a logger from the hierarchy. The name of the logger is taken to be the
                    // name contained in the event.
                    remoteLogger = hierarchy.getLogger(event.getLoggerName());
                    // event.logger = remoteLogger;
                    // apply the logger-level filter
                    if (event.getLevel().isGreaterOrEqual(remoteLogger.getEffectiveLevel())) {
                        // finally log the event as if was generated locally
                        remoteLogger.callAppenders(event);
                    }
                }
            }
        } catch (java.io.EOFException e) {
            logger.info("Caught java.io.EOFException closing conneciton.");
        } catch (java.net.SocketException e) {
            logger.info("Caught java.net.SocketException closing conneciton.");
        } catch (InterruptedIOException e) {
            Thread.currentThread().interrupt();
            logger.info("Caught java.io.InterruptedIOException: " + e);
            logger.info("Closing connection.");
        } catch (IOException e) {
            logger.info("Caught java.io.IOException: " + e);
            logger.info("Closing connection.");
        } catch (Exception e) {
            logger.error("Unexpected exception. Closing conneciton.", e);
        } finally {
            if (ois != null) {
                try {
                    ois.close();
                } catch (Exception e) {
                    logger.info("Could not close connection.", e);
                }
            }
            if (socket != null) {
                try {
                    socket.close();
                } catch (InterruptedIOException e) {
                    Thread.currentThread().interrupt();
                } catch (IOException ex) {
                }
            }
        }
    }
}