| /* |
| * 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.bsp; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.RecordReader; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.hadoop.io.Text; |
| |
| /** |
| * Only returns a single key-value pair so that the map() can run. |
| */ |
| class BspRecordReader extends RecordReader<Text, Text> { |
| |
| private static final Text ONLY_KEY = new Text("only key"); |
| private static final Text ONLY_VALUE = new Text("only value"); |
| |
| /** Has the one record been seen? */ |
| private boolean seenRecord = false; |
| |
| @Override |
| public void close() throws IOException { |
| return; |
| } |
| |
| @Override |
| public float getProgress() throws IOException { |
| return (seenRecord ? 1f : 0f); |
| } |
| |
| @Override |
| public Text getCurrentKey() throws IOException, InterruptedException { |
| return ONLY_KEY; |
| } |
| |
| @Override |
| public Text getCurrentValue() throws IOException, InterruptedException { |
| return ONLY_VALUE; |
| } |
| |
| @Override |
| public void initialize(InputSplit inputSplit, TaskAttemptContext context) |
| throws IOException, InterruptedException { |
| } |
| |
| @Override |
| public boolean nextKeyValue() throws IOException, InterruptedException { |
| return (seenRecord ? false : (seenRecord = true)); |
| } |
| } |