001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017package org.apache.logging.log4j.flume.appender;
018
019import org.apache.flume.ChannelException;
020import org.apache.flume.Event;
021import org.apache.flume.EventDrivenSource;
022import org.apache.flume.instrumentation.SourceCounter;
023import org.apache.flume.source.AbstractSource;
024import org.slf4j.Logger;
025import org.slf4j.LoggerFactory;
026
027/**
028 *
029 */
030public class Log4jEventSource extends AbstractSource implements EventDrivenSource {
031
032    private static final Logger LOGGER = LoggerFactory.getLogger(Log4jEventSource.class);
033
034    private final SourceCounter sourceCounter = new SourceCounter("log4j");
035
036    public Log4jEventSource() {
037        setName("Log4jEvent");
038    }
039
040    @Override
041    public synchronized void start() {
042        super.start();
043
044        LOGGER.info("Log4j Source started");
045    }
046
047    @Override
048    public synchronized void stop() {
049        super.stop();
050
051        LOGGER.info("Log4j Source stopped. Metrics {}", sourceCounter);
052    }
053
054
055    public void send(final Event event) {
056        sourceCounter.incrementAppendReceivedCount();
057        sourceCounter.incrementEventReceivedCount();
058        try {
059            getChannelProcessor().processEvent(event);
060        } catch (final ChannelException ex) {
061            LOGGER.warn("Unable to process event {}", event, ex);
062            throw ex;
063        }
064        sourceCounter.incrementAppendAcceptedCount();
065        sourceCounter.incrementEventAcceptedCount();
066    }
067}