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VertexWriter.java
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/
VertexWriter.java
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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.graph;
import java.io.IOException;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
/**
* Implement to output a vertex range of the graph after the computation
*
* @param <I> Vertex id
* @param <V> Vertex value
* @param <E> Edge value
*/
@SuppressWarnings("rawtypes")
public interface VertexWriter<I extends WritableComparable, V extends Writable,
E extends Writable> {
/**
* Use the context to setup writing the vertices.
* Guaranteed to be called prior to any other function.
*
* @param context Context used to write the vertices.
* @throws IOException
* @throws InterruptedException
*/
void initialize(TaskAttemptContext context) throws IOException,
InterruptedException;
/**
* Writes the next vertex and associated data
*
* @param vertex set the properties of this vertex
* @throws IOException
* @throws InterruptedException
*/
void writeVertex(Vertex<I, V, E, ?> vertex)
throws IOException, InterruptedException;
/**
* Close this {@link VertexWriter} to future operations.
*
* @param context the context of the task
* @throws IOException
* @throws InterruptedException
*/
void close(TaskAttemptContext context)
throws IOException, InterruptedException;
}