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Giraph examples (for learning and testing)

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/*
 * 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.examples;

import org.apache.giraph.graph.BasicComputation;
import org.apache.giraph.graph.Vertex;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;

import java.io.IOException;

/**
 * User applications can subclass IdentityComputation, which
 * simply prints the results that have been read for testing IO related
 * jobs under any inputformat
 *
 * @param  Vertex index value
 * @param  Vertex value
 * @param  Edge value
 * @param  Message value
 */
@SuppressWarnings("rawtypes")
public class IdentityComputation
  extends BasicComputation {
  @Override
  public void compute(Vertex vertex,
      Iterable messages) throws IOException {
    vertex.voteToHalt();
  }
}