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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  package org.apache.logging.log4j.flume.appender;
18  
19  import org.apache.flume.ChannelException;
20  import org.apache.flume.Event;
21  import org.apache.flume.EventDrivenSource;
22  import org.apache.flume.instrumentation.SourceCounter;
23  import org.apache.flume.source.AbstractSource;
24  import org.slf4j.Logger;
25  import org.slf4j.LoggerFactory;
26  
27  /**
28   *
29   */
30  public class Log4jEventSource extends AbstractSource implements EventDrivenSource {
31  
32      private static final Logger LOGGER = LoggerFactory.getLogger(Log4jEventSource.class);
33  
34      private final SourceCounter sourceCounter = new SourceCounter("log4j");
35  
36      public Log4jEventSource() {
37          setName("Log4jEvent");
38      }
39  
40      @Override
41      public synchronized void start() {
42          super.start();
43  
44          LOGGER.info("Log4j Source started");
45      }
46  
47      @Override
48      public synchronized void stop() {
49          super.stop();
50  
51          LOGGER.info("Log4j Source stopped. Metrics {}", sourceCounter);
52      }
53  
54  
55      public void send(final Event event) {
56          sourceCounter.incrementAppendReceivedCount();
57          sourceCounter.incrementEventReceivedCount();
58          try {
59              getChannelProcessor().processEvent(event);
60          } catch (final ChannelException ex) {
61              LOGGER.warn("Unabled to process event {}" + event, ex);
62              throw ex;
63          }
64          sourceCounter.incrementAppendAcceptedCount();
65          sourceCounter.incrementEventAcceptedCount();
66      }
67  }