001/**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019package org.apache.hadoop.hbase.regionserver.wal;
020
021import java.io.IOException;
022
023import org.apache.hadoop.hbase.util.Bytes;
024import org.apache.hadoop.hbase.wal.WAL.Entry;
025
026public class InstrumentedLogWriter extends ProtobufLogWriter {
027
028  public InstrumentedLogWriter() {
029    super();
030  }
031
032  @Override
033  protected String getWriterClassName() {
034    return ProtobufLogWriter.class.getSimpleName();
035  }
036
037  public static boolean activateFailure = false;
038  @Override
039    public void append(Entry entry) throws IOException {
040      super.append(entry);
041      if (activateFailure &&
042          Bytes.equals(entry.getKey().getEncodedRegionName(), Bytes.toBytes("break"))) {
043        System.out.println(getClass().getName() + ": I will throw an exception now...");
044        throw(new IOException("This exception is instrumented and should only be thrown for testing"
045            ));
046      }
047    }
048}