001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    
019    package org.apache.hadoop.yarn;
020    
021    import org.apache.hadoop.classification.InterfaceAudience.Public;
022    import org.apache.hadoop.classification.InterfaceStability.Unstable;
023    import org.apache.log4j.RollingFileAppender;
024    
025    import java.io.File;
026    import java.io.Flushable;
027    
028    /**
029     * A simple log4j-appender for container's logs.
030     *
031     */
032    @Public
033    @Unstable
034    public class ContainerRollingLogAppender extends RollingFileAppender
035      implements Flushable {
036      private String containerLogDir;
037    
038      @Override
039      public void activateOptions() {
040        synchronized (this) {
041          setFile(new File(this.containerLogDir, "syslog").toString());
042          setAppend(true);
043          super.activateOptions();
044        }
045      }
046    
047      @Override
048      public void flush() {
049        if (qw != null) {
050          qw.flush();
051        }
052      }
053    
054      /**
055       * Getter/Setter methods for log4j.
056       */
057    
058      public String getContainerLogDir() {
059        return this.containerLogDir;
060      }
061    
062      public void setContainerLogDir(String containerLogDir) {
063        this.containerLogDir = containerLogDir;
064      }
065    }