JobTest.java

/**
 * 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 xxx;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.junit.Assert;
import org.junit.Test;

import xxx.Computation;
import xxx.Context;
import xxx.MemoryUnits;

public class JobTest {

  static class SumComputation extends Computation<IntWritable, IntWritable> {

    @Override
    public IntWritable compute(IntWritable inMessage, Context ctx) {
      if (ctx.getCurrentIteration() == 0l) {
        return new IntWritable(1);
      } else {
        Assert.assertEquals(2, inMessage.get());
      }
      return yieldComputation();
    }

    @Override
    public IntWritable reduce(IntWritable left, IntWritable right) {
      return new IntWritable(left.get() + right.get());
    }

    @Override
    public IntWritable reduceLast(IntWritable last) {
      Assert.assertEquals(2, last.get());
      return last;
    }

  }

  @Test
  public void testJobSubmission() throws IOException, InterruptedException {
    Configuration conf = new Configuration();
    Job job = Job.newInstance(conf).computation(SumComputation.class)
        .withInput(TextInputFormat.class, new Path("conf/*.xml"))
        .memory(1, MemoryUnits.GB).maxIterations(2);
    Assert.assertTrue(job.waitForCompletion());

  }

}