/*
   * 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.giraph.aggregators;
  
  import static org.junit.Assert.assertTrue;
  
  import java.io.IOException;
  
  import org.apache.giraph.BspCase;
  import org.apache.giraph.comm.aggregators.AggregatorUtils;
  import org.apache.giraph.conf.GiraphConfiguration;
  import org.apache.giraph.conf.GiraphConstants;
  import org.apache.giraph.examples.AggregatorsTestComputation;
  import org.apache.giraph.examples.SimpleCheckpoint;
  import org.apache.giraph.job.GiraphJob;
  import org.apache.hadoop.fs.Path;
  import org.junit.Test;
  
  /** Tests if aggregators are handled on a proper way */
  public class TestAggregatorsHandling extends BspCase {
  
    public TestAggregatorsHandling() {
      super(TestAggregatorsHandling.class.getName());
    }
  
    /** Tests if aggregators are handled on a proper way during supersteps */
    @Test
    public void testAggregatorsHandling() throws IOException,
        ClassNotFoundException, InterruptedException {
      GiraphConfiguration conf = new GiraphConfiguration();
      conf.setComputationClass(AggregatorsTestComputation.class);
      conf.setVertexInputFormatClass(
          AggregatorsTestComputation.SimpleVertexInputFormat.class);
      conf.setEdgeInputFormatClass(
          AggregatorsTestComputation.SimpleEdgeInputFormat.class);
      GiraphJob job = prepareJob(getCallingMethodName(), conf);
      job.getConfiguration().setMasterComputeClass(
          AggregatorsTestComputation.AggregatorsTestMasterCompute.class);
      // test with aggregators split in a few requests
      job.getConfiguration().setInt(
          AggregatorUtils.MAX_BYTES_PER_AGGREGATOR_REQUEST, 50);
      assertTrue(job.run(true));
    }
  
    /**
     * Test if aggregators are are handled properly when restarting from a
     * checkpoint
     */
    @Test
    public void testAggregatorsCheckpointing() throws ClassNotFoundException,
        IOException, InterruptedException {
      Path checkpointsDir = getTempPath("checkPointsForTesting");
      Path outputPath = getTempPath(getCallingMethodName());
      GiraphConfiguration conf = new GiraphConfiguration();
      conf.setComputationClass(AggregatorsTestComputation.class);
      conf.setMasterComputeClass(
          AggregatorsTestComputation.AggregatorsTestMasterCompute.class);
      conf.setVertexInputFormatClass(
          AggregatorsTestComputation.SimpleVertexInputFormat.class);
      conf.setEdgeInputFormatClass(
          AggregatorsTestComputation.SimpleEdgeInputFormat.class);
      GiraphJob job = prepareJob(getCallingMethodName(), conf, outputPath);
  
      GiraphConfiguration configuration = job.getConfiguration();
      GiraphConstants.CHECKPOINT_DIRECTORY.set(configuration, checkpointsDir.toString());
      GiraphConstants.CLEANUP_CHECKPOINTS_AFTER_SUCCESS.set(configuration, false);
      configuration.setCheckpointFrequency(4);
  
      assertTrue(job.run(true));
  
      // Restart the test from superstep 4
      System.out.println("testAggregatorsCheckpointing: Restarting from " +
          "superstep 4 with checkpoint path = " + checkpointsDir);
      outputPath = getTempPath(getCallingMethodName() + "Restarted");
      conf = new GiraphConfiguration();
      conf.setComputationClass(AggregatorsTestComputation.class);
      conf.setMasterComputeClass(
          AggregatorsTestComputation.AggregatorsTestMasterCompute.class);
      conf.setVertexInputFormatClass(
          AggregatorsTestComputation.SimpleVertexInputFormat.class);
      conf.setEdgeInputFormatClass(
          AggregatorsTestComputation.SimpleEdgeInputFormat.class);
      GiraphJob restartedJob = prepareJob(getCallingMethodName() + "Restarted",
         conf, outputPath);
     job.getConfiguration().setMasterComputeClass(
         SimpleCheckpoint.SimpleCheckpointVertexMasterCompute.class);
     GiraphConfiguration restartedJobConf = restartedJob.getConfiguration();
     GiraphConstants.CHECKPOINT_DIRECTORY.set(restartedJobConf,
         checkpointsDir.toString());
     restartedJobConf.setLong(GiraphConstants.RESTART_SUPERSTEP, 4);
 
     assertTrue(restartedJob.run(true));
   }
 }