/*
    * 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.block_app.framework;
  
  import org.apache.giraph.block_app.framework.api.BlockWorkerSendApi;
  import org.apache.giraph.block_app.framework.block.Block;
  import org.apache.giraph.block_app.framework.piece.Piece;
  import org.apache.giraph.block_app.framework.piece.interfaces.VertexSender;
  import org.apache.giraph.block_app.test_setup.NumericTestGraph;
  import org.apache.giraph.block_app.test_setup.TestGraphChecker;
  import org.apache.giraph.block_app.test_setup.TestGraphModifier;
  import org.apache.giraph.block_app.test_setup.TestGraphUtils;
  import org.apache.giraph.conf.BulkConfigurator;
  import org.apache.giraph.conf.GiraphConfiguration;
  import org.apache.giraph.edge.Edge;
  import org.apache.giraph.edge.ReusableEdge;
  import org.apache.giraph.graph.Vertex;
  import org.apache.hadoop.io.LongWritable;
  import org.apache.hadoop.io.NullWritable;
  import org.apache.hadoop.io.Writable;
  import org.junit.Assert;
  import org.junit.Test;
  
  /**
   * Test when vertex gets multiple simultaneous mutations
   * (i.e. to non-existent vertex, send a message and do add edge request)
   * and confirm all mutations are correctly processed
   */
  public class MultipleSimultanousMutationsTest {
    @Test
    public void createVertexOnMsgsTest() throws Exception {
      TestGraphUtils.runTest(
          new TestGraphModifier<LongWritable, Writable, LongWritable>() {
            @Override
            public void modifyGraph(NumericTestGraph<LongWritable, Writable, LongWritable> graph) {
              graph.addEdge(1, 2, 2);
            }
          },
          new TestGraphChecker<LongWritable, Writable, LongWritable>() {
            @Override
            public void checkOutput(NumericTestGraph<LongWritable, Writable, LongWritable> graph) {
              Assert.assertEquals(1, graph.getVertex(1).getNumEdges());
              Assert.assertNull(graph.getVertex(1).getEdgeValue(new LongWritable(-1)));
              Assert.assertEquals(2, graph.getVertex(1).getEdgeValue(new LongWritable(2)).get());
  
              Assert.assertEquals(1, graph.getVertex(2).getNumEdges());
              Assert.assertEquals(-1, graph.getVertex(2).getEdgeValue(new LongWritable(-1)).get());
            }
          },
          new BulkConfigurator() {
            @Override
            public void configure(GiraphConfiguration conf) {
              BlockUtils.setBlockFactoryClass(conf, SendingAndAddEdgeBlockFactory.class);
            }
          });
    }
  
    public static class SendingAndAddEdgeBlockFactory extends TestLongNullNullBlockFactory {
      @Override
      protected Class<? extends Writable> getEdgeValueClass(GiraphConfiguration conf) {
        return LongWritable.class;
      }
  
      @Override
      public Block createBlock(GiraphConfiguration conf) {
        return new Piece<LongWritable, Writable, LongWritable, NullWritable, Object>() {
          @Override
          protected Class<NullWritable> getMessageClass() {
            return NullWritable.class;
          }
  
          @Override
          public VertexSender<LongWritable, Writable, LongWritable> getVertexSender(
              final BlockWorkerSendApi<LongWritable, Writable, LongWritable, NullWritable> workerApi,
              Object executionStage) {
            final ReusableEdge<LongWritable, LongWritable> reusableEdge = workerApi.getConf().createReusableEdge();
            reusableEdge.setTargetVertexId(new LongWritable(-1));
            reusableEdge.setValue(new LongWritable(-1));
            return new VertexSender<LongWritable, Writable, LongWritable>() {
              @Override
              public void vertexSend(Vertex<LongWritable, Writable, LongWritable> vertex) {
                for (Edge<LongWritable, LongWritable> edge : vertex.getEdges()) {
                  workerApi.addEdgeRequest(edge.getTargetVertexId(), reusableEdge);
                 workerApi.sendMessage(edge.getTargetVertexId(), NullWritable.get());
               }
             }
           };
         }
       };
     }
   }
 }