com.ikanow.aleph2.analytics.hadoop.services.BeStreamParser.java Source code

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Here is the source code for com.ikanow.aleph2.analytics.hadoop.services.BeStreamParser.java

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/*******************************************************************************
 * Copyright 2015, The IKANOW Open Source Project.
 *
 * Licensed 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 com.ikanow.aleph2.analytics.hadoop.services;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.Optional;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import scala.Tuple2;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.ikanow.aleph2.analytics.hadoop.data_model.IParser;
import com.ikanow.aleph2.core.shared.utils.BatchRecordUtils;
import com.ikanow.aleph2.data_model.interfaces.data_analytics.IBatchRecord;
import com.ikanow.aleph2.data_model.utils.BeanTemplateUtils;

//TODO (ALEPH-12): this isn't supposed to read the binary in until requested (And then in blocks, so can handle high memory cases)

/** Parser for readining in binary data
 * @author Alex
 */
public class BeStreamParser implements IParser {

    private static final Logger logger = LogManager.getLogger(BeStreamParser.class);

    @Override
    public Tuple2<Long, IBatchRecord> getNextRecord(long currentFileIndex, String fileName, InputStream inStream) {
        logger.debug("StreamParser.getNextRecord");

        ObjectMapper mapper = BeanTemplateUtils.configureMapper(Optional.empty());
        Tuple2<Long, IBatchRecord> t2 = null;
        try {
            JsonNode node = mapper.createObjectNode();
            ((ObjectNode) node).put("fileName", fileName);
            // create output stream
            ByteArrayOutputStream outStream = new ByteArrayOutputStream();
            int readedBytes;
            byte[] buf = new byte[1024];
            while ((readedBytes = inStream.read(buf)) > 0) {
                outStream.write(buf, 0, readedBytes);
            }
            outStream.close();
            t2 = new Tuple2<Long, IBatchRecord>(currentFileIndex,
                    new BatchRecordUtils.BatchRecord(node, outStream));
        } catch (Exception e) {
            logger.error("JsonParser caught exception", e);
        }
        return t2;
    }

    /* (non-Javadoc)
     * @see com.ikanow.aleph2.analytics.hadoop.data_model.IParser#handleThisPath(java.lang.String)
     */
    @Override
    public boolean handleThisPath(String path) {
        return true;
    }
}