/*

  * 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.edge;

 import org.apache.giraph.bsp.CentralizedServiceWorker;

 import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;

 import org.apache.giraph.edge.primitives.IntEdgeStore;

 import org.apache.giraph.edge.primitives.LongEdgeStore;

 import org.apache.hadoop.io.IntWritable;

 import org.apache.hadoop.io.LongWritable;

 import org.apache.hadoop.io.Writable;

 import org.apache.hadoop.io.WritableComparable;

 import org.apache.hadoop.util.Progressable;

 /**

  * Edge store factory which produces message stores which hold all

  * edges in memory. It creates primitive edges stores when vertex id is

  * IntWritable or LongWritable

  *

  * @param <I> Vertex id

  * @param <V> Vertex value

  * @param <E> Edge value

  */

 @SuppressWarnings("unchecked")

 public class InMemoryEdgeStoreFactory<I extends WritableComparable,

   V extends Writable, E extends Writable>

   implements EdgeStoreFactory<I, V, E> {

   /** Service worker. */

   protected CentralizedServiceWorker<I, V, E> service;

   /** Giraph configuration. */

   protected ImmutableClassesGiraphConfiguration<I, V, E> conf;

   /** Progressable to report progress. */

   protected Progressable progressable;

   @Override

   public EdgeStore<I, V, E> newStore() {

     Class<I> vertexIdClass = conf.getVertexIdClass();

     EdgeStore<I, V, E> edgeStore;

     if (vertexIdClass.equals(IntWritable.class)) {

       edgeStore = (EdgeStore<I, V, E>) new IntEdgeStore<>(

           (CentralizedServiceWorker<IntWritable, V, E>) service,

           (ImmutableClassesGiraphConfiguration<IntWritable, V, E>) conf,

           progressable);

     } else if (vertexIdClass.equals(LongWritable.class)) {

       edgeStore = (EdgeStore<I, V, E>) new LongEdgeStore<>(

           (CentralizedServiceWorker<LongWritable, V, E>) service,

           (ImmutableClassesGiraphConfiguration<LongWritable, V, E>) conf,

           progressable);

     } else {

       edgeStore = new SimpleEdgeStore<>(service, conf, progressable);

     }

     return edgeStore;

   }

   @Override

   public void initialize(CentralizedServiceWorker<I, V, E> service,

     ImmutableClassesGiraphConfiguration<I, V, E> conf,

     Progressable progressable) {

     this.service = service;

     this.conf = conf;

     this.progressable = progressable;

   }

 }