metron-streaming/Metron-DataLoads/src/main/java/org/apache/metron/dataloads/extractor/inputformat/WholeFileFormat.java

/**
 * 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.metron.dataloads.extractor.inputformat;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.*;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;

import java.io.IOException;
import java.util.Map;

public class WholeFileFormat implements InputFormatHandler {

    public static class WholeFileRecordReader extends RecordReader<NullWritable, Text> {
        private FileSplit fileSplit;
        private Configuration conf;
        private Text value = new Text();
        private boolean processed = false;

        @Override
        public void initialize(InputSplit split, TaskAttemptContext context) throws IOException, InterruptedException {
            this.fileSplit = (FileSplit) split;
            this.conf = context.getConfiguration();
        }

        @Override
        public boolean nextKeyValue() throws IOException, InterruptedException {
            if (!processed) {
                byte[] contents = new byte[(int) fileSplit.getLength()];
                Path file = fileSplit.getPath();
                FileSystem fs = file.getFileSystem(conf);
                FSDataInputStream in = null;
                try {
                    in = fs.open(file);
                    IOUtils.readFully(in, contents, 0, contents.length);
                    value.set(contents, 0, contents.length);
                } finally {
                    IOUtils.closeStream(in);
                }
                processed = true;
                return true;
            }
            return false;
        }

        @Override
        public NullWritable getCurrentKey() throws IOException, InterruptedException {
            return NullWritable.get();
        }
        @Override
        public Text getCurrentValue() throws IOException, InterruptedException{
            return value;
        }

        @Override
        public float getProgress() throws IOException {
            return processed ? 1.0f : 0.0f;
        }

        @Override
        public void close() throws IOException{
            //do nothing :)
        }
    }

    public static class WholeFileInputFormat extends FileInputFormat<NullWritable, Text> {

        @Override
        protected boolean isSplitable(JobContext context, Path file) {
            return false;
        }

        @Override
        public RecordReader<NullWritable, Text> createRecordReader(
                InputSplit split, TaskAttemptContext context) throws IOException, InterruptedException {
            WholeFileRecordReader reader = new WholeFileRecordReader();
            reader.initialize(split, context);
            return reader;
        }
    }
    @Override
    public void set(Job job, Path input, Map<String, Object> config) throws IOException {
        WholeFileInputFormat.setInputPaths(job, input);
        job.setInputFormatClass(WholeFileInputFormat.class);
    }
}