/*
    * 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.io.gora;
  
  import static org.apache.giraph.io.gora.constants.GiraphGoraConstants.GIRAPH_GORA_DATASTORE_CLASS;
  import static org.apache.giraph.io.gora.constants.GiraphGoraConstants.GIRAPH_GORA_END_KEY;
  import static org.apache.giraph.io.gora.constants.GiraphGoraConstants.GIRAPH_GORA_KEYS_FACTORY_CLASS;
  import static org.apache.giraph.io.gora.constants.GiraphGoraConstants.GIRAPH_GORA_KEY_CLASS;
  import static org.apache.giraph.io.gora.constants.GiraphGoraConstants.GIRAPH_GORA_PERSISTENT_CLASS;
  import static org.apache.giraph.io.gora.constants.GiraphGoraConstants.GIRAPH_GORA_START_KEY;
  import static org.apache.giraph.io.gora.constants.GiraphGoraConstants.GIRAPH_GORA_OUTPUT_DATASTORE_CLASS;
  import static org.apache.giraph.io.gora.constants.GiraphGoraConstants.GIRAPH_GORA_OUTPUT_KEY_CLASS;
  import static org.apache.giraph.io.gora.constants.GiraphGoraConstants.GIRAPH_GORA_OUTPUT_PERSISTENT_CLASS;
  
  import java.io.IOException;
  
  import org.apache.giraph.conf.GiraphConfiguration;
  import org.apache.giraph.graph.BasicComputation;
  import org.apache.giraph.graph.Vertex;
  import org.apache.giraph.utils.InternalVertexRunner;
  import org.apache.hadoop.io.DoubleWritable;
  import org.apache.hadoop.io.FloatWritable;
  import org.apache.hadoop.io.LongWritable;
  import org.junit.Assert;
  import org.junit.Test;
  
  /**
   * Test class for Gora edge output formats.
   */
  public class TestGoraEdgeOutputFormat {
  
    @Test
    public void getWritingDb() throws Exception {
      Iterable<String>    results;
      GiraphConfiguration conf    = new GiraphConfiguration();
      // Parameters for input
      GIRAPH_GORA_DATASTORE_CLASS.
      set(conf, "org.apache.gora.memory.store.MemStore");
      GIRAPH_GORA_KEYS_FACTORY_CLASS.
      set(conf,"org.apache.giraph.io.gora.utils.DefaultKeyFactory");
      GIRAPH_GORA_KEY_CLASS.set(conf,"java.lang.String");
      GIRAPH_GORA_PERSISTENT_CLASS.
      set(conf,"org.apache.giraph.io.gora.generated.GEdge");
      GIRAPH_GORA_START_KEY.set(conf,"1");
      GIRAPH_GORA_END_KEY.set(conf,"4");
      conf.set("io.serializations",
          "org.apache.hadoop.io.serializer.WritableSerialization," +
          "org.apache.hadoop.io.serializer.JavaSerialization");
      conf.setComputationClass(EmptyComputation.class);
      conf.setEdgeInputFormatClass(GoraTestEdgeInputFormat.class);
      // Parameters for output
      GIRAPH_GORA_OUTPUT_DATASTORE_CLASS.
      set(conf, "org.apache.gora.memory.store.MemStore");
      GIRAPH_GORA_OUTPUT_KEY_CLASS.set(conf, "java.lang.String");
      GIRAPH_GORA_OUTPUT_PERSISTENT_CLASS.
      set(conf,"org.apache.giraph.io.gora.generated.GEdgeResult");
      conf.setEdgeOutputFormatClass(GoraTestEdgeOutputFormat.class);
      results = InternalVertexRunner.run(conf, new String[0], new String[0]);
      Assert.assertNotNull(results);
    }
  
    /*
    Test compute method that sends each edge a notification of its parents.
    The test set only has a 1-1 parent-to-child ratio for this unit test.
     */
    public static class EmptyComputation
      extends BasicComputation<LongWritable, DoubleWritable,
      FloatWritable, LongWritable> {
  
      @Override
      public void compute(
          Vertex<LongWritable, DoubleWritable, FloatWritable> vertex,
          Iterable<LongWritable> messages) throws IOException {
        Assert.assertNotNull(vertex);
        vertex.voteToHalt();
      }
    }
  }