    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     */
    017    package org.apache.logging.log4j.flume.appender;
    018
    019    import org.apache.flume.ChannelException;
    020    import org.apache.flume.Event;
    021    import org.apache.flume.EventDrivenSource;
    022    import org.apache.flume.instrumentation.SourceCounter;
    023    import org.apache.flume.source.AbstractSource;
    024    import org.slf4j.Logger;
    025    import org.slf4j.LoggerFactory;
    026
    027    /**
    028     *
    029     */
    030    public 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("Unabled to process event {}" + event, ex);
    062                throw ex;
    063            }
    064            sourceCounter.incrementAppendAcceptedCount();
    065            sourceCounter.incrementEventAcceptedCount();
    066        }
    067    }