hdfs/src/test/aop/org/apache/hadoop/hdfs/server/datanode/FSDatasetAspects.aj

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hdfs.server.datanode;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fi.ProbabilityModel;
import org.apache.hadoop.hdfs.server.datanode.FSDataset;
import org.apache.hadoop.hdfs.server.datanode.FSDatasetInterface.BlockWriteStreams;
import org.apache.hadoop.util.DiskChecker.*;


/**
 * This aspect takes care about faults injected into datanode.FSDatase class
 */
public aspect FSDatasetAspects {
  public static final Log LOG = LogFactory.getLog(BlockReceiverAspects.class);

  pointcut execGetBlockFile() :
  // the following will inject faults inside of the method in question 		
    execution (* FSDataset.getBlockFile(..)) && !within(FSDatasetAspects +);

  pointcut callCreateBlockWriteStream(ReplicaInPipeline repl) : 
    call (BlockWriteStreams createStreams(..))
    && target (repl)
      && !within(FSDatasetAspects +);

  // This aspect specifies the logic of our fault point.
  // In this case it simply throws DiskErrorException at the very beginning of
  // invocation of the method, specified by callGetBlockFile() pointcut
  before() throws DiskErrorException : execGetBlockFile() {
    if (ProbabilityModel.injectCriteria(FSDataset.class.getSimpleName())) {
      LOG.info("Before the injection point");
      Thread.dumpStack();
      throw new DiskErrorException("FI: injected fault point at "
          + thisJoinPoint.getStaticPart().getSourceLocation());
    }
  }

  before(ReplicaInPipeline repl) throws DiskOutOfSpaceException : callCreateBlockWriteStream(repl) {
    if (ProbabilityModel.injectCriteria(FSDataset.class.getSimpleName())) {
      LOG.info("Before the injection point");
      Thread.dumpStack();
      throw new DiskOutOfSpaceException("FI: injected fault point at "
          + thisJoinPoint.getStaticPart().getSourceLocation());
    }
  }
}