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 */
018package org.apache.hadoop.hbase.regionserver.wal;
019
020import java.io.IOException;
021import org.apache.hadoop.hbase.util.Bytes;
022import org.apache.hadoop.hbase.wal.WAL.Entry;
023
024public class InstrumentedLogWriter extends ProtobufLogWriter {
025
026  public InstrumentedLogWriter() {
027    super();
028  }
029
030  @Override
031  protected String getWriterClassName() {
032    return ProtobufLogWriter.class.getSimpleName();
033  }
034
035  public static boolean activateFailure = false;
036
037  @Override
038  public void append(Entry entry) throws IOException {
039    super.append(entry);
040    if (
041      activateFailure && Bytes.equals(entry.getKey().getEncodedRegionName(), Bytes.toBytes("break"))
042    ) {
043      System.out.println(getClass().getName() + ": I will throw an exception now...");
044      throw (new IOException(
045        "This exception is instrumented and should only be thrown for testing"));
046    }
047  }
048}