org.apache.streams.amazon.kinesis.KinesisPersistReaderTask.java Source code

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Here is the source code for org.apache.streams.amazon.kinesis.KinesisPersistReaderTask.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
 *
 *   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.streams.amazon.kinesis;

import org.apache.streams.config.StreamsConfigurator;
import org.apache.streams.core.StreamsDatum;

import com.amazonaws.services.kinesis.model.GetRecordsRequest;
import com.amazonaws.services.kinesis.model.GetRecordsResult;
import com.amazonaws.services.kinesis.model.GetShardIteratorRequest;
import com.amazonaws.services.kinesis.model.GetShardIteratorResult;
import com.amazonaws.services.kinesis.model.Record;
import org.joda.time.DateTime;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.math.BigInteger;
import java.nio.charset.Charset;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * KinesisPersistReaderTask reads documents from kinesis on behalf of
 * @see {@link KinesisPersistReader}.
 */
public class KinesisPersistReaderTask implements Runnable {

    private static final Logger LOGGER = LoggerFactory.getLogger(KinesisPersistReaderTask.class);

    private KinesisPersistReader reader;
    private String streamName;
    private String shardId;

    private String shardIteratorId;

    private Long pollInterval = StreamsConfigurator.detectConfiguration().getBatchFrequencyMs();

    /**
     * KinesisPersistReaderTask constructor.
     */
    public KinesisPersistReaderTask(KinesisPersistReader reader, String streamName, String shardId) {
        this.reader = reader;
        this.streamName = streamName;
        this.shardId = shardId;
    }

    @Override
    public void run() {

        GetShardIteratorRequest shardIteratorRequest = new GetShardIteratorRequest().withStreamName(this.streamName)
                .withShardId(shardId).withShardIteratorType("TRIM_HORIZON");

        GetShardIteratorResult shardIteratorResult = reader.client.getShardIterator(shardIteratorRequest);

        shardIteratorId = shardIteratorResult.getShardIterator();

        Map<String, Object> metadata = new HashMap<>();
        metadata.put("streamName", streamName);
        metadata.put("shardId", shardId);

        while (true) {

            GetRecordsRequest recordsRequest = new GetRecordsRequest().withShardIterator(shardIteratorId);

            GetRecordsResult recordsResult = reader.client.getRecords(recordsRequest);

            LOGGER.info("{} records {} millis behind {}:{}:{} ", recordsResult.getRecords().size(),
                    recordsResult.getMillisBehindLatest(), streamName, shardId, shardIteratorId);

            shardIteratorId = recordsResult.getNextShardIterator();

            List<Record> recordList = recordsResult.getRecords();

            for (Record record : recordList) {
                try {
                    byte[] byteArray = record.getData().array();
                    //byte[] decoded = Base64.decode(byteArray);
                    String message = new String(byteArray, Charset.forName("UTF-8"));
                    reader.persistQueue.add(new StreamsDatum(message, record.getPartitionKey(), new DateTime(),
                            new BigInteger(record.getSequenceNumber()), metadata));
                } catch (Exception ex) {
                    LOGGER.warn("Exception processing record {}: {}", record, ex);
                }
            }
            try {
                Thread.sleep(reader.pollInterval);
            } catch (InterruptedException ex) {
                LOGGER.trace("InterruptedException", ex);
            }
        }

    }

}