/*
    * 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.hbase.mapred;
  
  import com.google.common.collect.Lists;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.hbase.client.Result;
  import org.apache.hadoop.hbase.client.Scan;
  import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
  import org.apache.hadoop.hbase.testclassification.LargeTests;
  import org.apache.hadoop.io.NullWritable;
  import org.apache.hadoop.mapred.FileOutputFormat;
  import org.apache.hadoop.mapred.JobClient;
  import org.apache.hadoop.mapred.JobConf;
  import org.apache.hadoop.mapred.OutputCollector;
  import org.apache.hadoop.mapred.Reporter;
  import org.apache.hadoop.mapred.RunningJob;
  import org.junit.experimental.categories.Category;
  
  import java.io.IOException;
  import java.util.Iterator;
  import java.util.List;
  
  import static org.junit.Assert.assertTrue;
  
  @Category({ LargeTests.class })
  @edu.umd.cs.findbugs.annotations.SuppressWarnings("NM_SAME_SIMPLE_NAME_AS_SUPERCLASS")
  public class TestMultiTableSnapshotInputFormat
      extends org.apache.hadoop.hbase.mapreduce.TestMultiTableSnapshotInputFormat {
  
    private static final Log LOG = LogFactory.getLog(TestMultiTableSnapshotInputFormat.class);
  
    @Override
    protected void runJob(String jobName, Configuration c, List<Scan> scans)
        throws IOException, InterruptedException, ClassNotFoundException {
      JobConf job = new JobConf(TEST_UTIL.getConfiguration());
  
      job.setJobName(jobName);
      job.setMapperClass(Mapper.class);
      job.setReducerClass(Reducer.class);
  
      TableMapReduceUtil.initMultiTableSnapshotMapperJob(getSnapshotScanMapping(scans), Mapper.class,
          ImmutableBytesWritable.class, ImmutableBytesWritable.class, job, true, restoreDir);
  
      TableMapReduceUtil.addDependencyJars(job);
  
      job.setReducerClass(Reducer.class);
      job.setNumReduceTasks(1); // one to get final "first" and "last" key
      FileOutputFormat.setOutputPath(job, new Path(job.getJobName()));
      LOG.info("Started " + job.getJobName());
  
      RunningJob runningJob = JobClient.runJob(job);
      runningJob.waitForCompletion();
      assertTrue(runningJob.isSuccessful());
      LOG.info("After map/reduce completion - job " + jobName);
    }
  
    public static class Mapper extends TestMultiTableSnapshotInputFormat.ScanMapper
        implements TableMap<ImmutableBytesWritable, ImmutableBytesWritable> {
  
      @Override
      public void map(ImmutableBytesWritable key, Result value,
          OutputCollector<ImmutableBytesWritable, ImmutableBytesWritable> outputCollector,
          Reporter reporter) throws IOException {
        makeAssertions(key, value);
        outputCollector.collect(key, key);
      }
  
      /**
       * Closes this stream and releases any system resources associated
       * with it. If the stream is already closed then invoking this
       * method has no effect.
       *
       * @throws IOException if an I/O error occurs
       */
      @Override
      public void close() throws IOException {
      }
  
      @Override
     public void configure(JobConf jobConf) {
 
     }
   }
 
   public static class Reducer extends TestMultiTableSnapshotInputFormat.ScanReducer implements
       org.apache.hadoop.mapred.Reducer<ImmutableBytesWritable, ImmutableBytesWritable,
           NullWritable, NullWritable> {
 
     private JobConf jobConf;
 
     @Override
     public void reduce(ImmutableBytesWritable key, Iterator<ImmutableBytesWritable> values,
         OutputCollector<NullWritable, NullWritable> outputCollector, Reporter reporter)
         throws IOException {
       makeAssertions(key, Lists.newArrayList(values));
     }
 
     /**
      * Closes this stream and releases any system resources associated
      * with it. If the stream is already closed then invoking this
      * method has no effect.
      *
      * @throws IOException if an I/O error occurs
      */
     @Override
     public void close() throws IOException {
       super.cleanup(this.jobConf);
     }
 
     @Override
     public void configure(JobConf jobConf) {
       this.jobConf = jobConf;
     }
   }
 }