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 java.util.LinkedList;
022import java.util.Queue;
023
024import org.apache.hadoop.hbase.wal.WAL.Entry;
025
026public class FaultyProtobufLogReader extends ProtobufLogReader {
027
028  // public until class relocates to o.a.h.h.wal
029  public enum FailureType {
030    BEGINNING, MIDDLE, END, NONE
031  }
032
033  Queue<Entry> nextQueue = new LinkedList<>();
034  int numberOfFileEntries = 0;
035
036  FailureType getFailureType() {
037    return FailureType.valueOf(conf.get("faultyprotobuflogreader.failuretype", "NONE"));
038  }
039
040  @Override
041  public Entry next(Entry reuse) throws IOException {
042    if (nextQueue.isEmpty()) { // Read the whole thing at once and fake reading
043      boolean b;
044      do {
045        Entry e = new Entry();
046        b = readNext(e);
047        nextQueue.offer(e);
048        numberOfFileEntries++;
049      } while (b);
050    }
051
052    if (nextQueue.size() == this.numberOfFileEntries && getFailureType() == FailureType.BEGINNING) {
053      throw new IOException("fake Exception");
054    } else if (nextQueue.size() == this.numberOfFileEntries / 2
055        && getFailureType() == FailureType.MIDDLE) {
056      throw new IOException("fake Exception");
057    } else if (nextQueue.size() == 1 && getFailureType() == FailureType.END) {
058      throw new IOException("fake Exception");
059    }
060
061    if (nextQueue.peek() != null) {
062      edit++;
063    }
064
065    Entry e = nextQueue.poll();
066
067    if (e.getEdit().isEmpty()) {
068      return null;
069    }
070    return e;
071  }
072}