Contoh Kinesis menggunakan SDK untuk Java 2.x

Contoh kode berikut menunjukkan cara melakukan tindakan dan mengimplementasikan skenario umum dengan menggunakan AWS SDK for Java 2.x Kinesis with.

Tindakan adalah kutipan kode dari program yang lebih besar dan harus dijalankan dalam konteks. Meskipun tindakan menunjukkan cara memanggil fungsi layanan individual, Anda dapat melihat tindakan dalam konteks pada skenario terkait dan contoh lintas layanan.

Skenario adalah contoh kode yang menunjukkan cara menyelesaikan tugas tertentu dengan memanggil beberapa fungsi dalam layanan yang sama.

Setiap contoh menyertakan tautan ke GitHub, di mana Anda dapat menemukan petunjuk tentang cara mengatur dan menjalankan kode dalam konteks.

Tindakan

Contoh kode berikut menunjukkan cara menggunakanCreateStream.

SDKuntuk Java 2.x

catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara mengatur dan menjalankannya di AWS Repositori Contoh Kode.


import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.kinesis.KinesisClient;
import software.amazon.awssdk.services.kinesis.model.CreateStreamRequest;
import software.amazon.awssdk.services.kinesis.model.KinesisException;

/**
 * Before running this Java V2 code example, set up your development
 * environment, including your credentials.
 *
 * For more information, see the following documentation topic:
 *
 * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
 */
public class CreateDataStream {
    public static void main(String[] args) {

        final String usage = """

                Usage:
                    <streamName>

                Where:
                    streamName - The Amazon Kinesis data stream (for example, StockTradeStream).
                """;

        if (args.length != 1) {
            System.out.println(usage);
            System.exit(1);
        }

        String streamName = args[0];
        Region region = Region.US_EAST_1;
        KinesisClient kinesisClient = KinesisClient.builder()
                .region(region)
                .build();
        createStream(kinesisClient, streamName);
        System.out.println("Done");
        kinesisClient.close();
    }

    public static void createStream(KinesisClient kinesisClient, String streamName) {
        try {
            CreateStreamRequest streamReq = CreateStreamRequest.builder()
                    .streamName(streamName)
                    .shardCount(1)
                    .build();

            kinesisClient.createStream(streamReq);

        } catch (KinesisException e) {
            System.err.println(e.getMessage());
            System.exit(1);
        }
    }
}

Untuk API detailnya, lihat CreateStreamdi AWS SDK for Java 2.x APIReferensi.

Contoh kode berikut menunjukkan cara menggunakanDeleteStream.

SDKuntuk Java 2.x

catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara mengatur dan menjalankannya di AWS Repositori Contoh Kode.


import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.kinesis.KinesisClient;
import software.amazon.awssdk.services.kinesis.model.DeleteStreamRequest;
import software.amazon.awssdk.services.kinesis.model.KinesisException;

/**
 * Before running this Java V2 code example, set up your development
 * environment, including your credentials.
 *
 * For more information, see the following documentation topic:
 *
 * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
 */
public class DeleteDataStream {

    public static void main(String[] args) {
        final String usage = """

                Usage:
                    <streamName>

                Where:
                    streamName - The Amazon Kinesis data stream (for example, StockTradeStream)
                """;

        if (args.length != 1) {
            System.out.println(usage);
            System.exit(1);
        }

        String streamName = args[0];
        Region region = Region.US_EAST_1;
        KinesisClient kinesisClient = KinesisClient.builder()
                .region(region)
                .build();

        deleteStream(kinesisClient, streamName);
        kinesisClient.close();
        System.out.println("Done");
    }

    public static void deleteStream(KinesisClient kinesisClient, String streamName) {
        try {
            DeleteStreamRequest delStream = DeleteStreamRequest.builder()
                    .streamName(streamName)
                    .build();

            kinesisClient.deleteStream(delStream);

        } catch (KinesisException e) {
            System.err.println(e.getMessage());
            System.exit(1);
        }
    }
}

Untuk API detailnya, lihat DeleteStreamdi AWS SDK for Java 2.x APIReferensi.

Contoh kode berikut menunjukkan cara menggunakanGetRecords.

SDKuntuk Java 2.x

catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara mengatur dan menjalankannya di AWS Repositori Contoh Kode.


import software.amazon.awssdk.core.SdkBytes;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.kinesis.KinesisClient;
import software.amazon.awssdk.services.kinesis.model.DescribeStreamResponse;
import software.amazon.awssdk.services.kinesis.model.DescribeStreamRequest;
import software.amazon.awssdk.services.kinesis.model.Shard;
import software.amazon.awssdk.services.kinesis.model.GetShardIteratorRequest;
import software.amazon.awssdk.services.kinesis.model.GetShardIteratorResponse;
import software.amazon.awssdk.services.kinesis.model.Record;
import software.amazon.awssdk.services.kinesis.model.GetRecordsRequest;
import software.amazon.awssdk.services.kinesis.model.GetRecordsResponse;
import java.util.ArrayList;
import java.util.List;

/**
 * Before running this Java V2 code example, set up your development
 * environment, including your credentials.
 *
 * For more information, see the following documentation topic:
 *
 * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
 */
public class GetRecords {
    public static void main(String[] args) {
        final String usage = """

                Usage:
                    <streamName>

                Where:
                    streamName - The Amazon Kinesis data stream to read from (for example, StockTradeStream).
                """;

        if (args.length != 1) {
            System.out.println(usage);
            System.exit(1);
        }

        String streamName = args[0];
        Region region = Region.US_EAST_1;
        KinesisClient kinesisClient = KinesisClient.builder()
                .region(region)
                .build();

        getStockTrades(kinesisClient, streamName);
        kinesisClient.close();
    }

    public static void getStockTrades(KinesisClient kinesisClient, String streamName) {
        String shardIterator;
        String lastShardId = null;
        DescribeStreamRequest describeStreamRequest = DescribeStreamRequest.builder()
                .streamName(streamName)
                .build();

        List<Shard> shards = new ArrayList<>();
        DescribeStreamResponse streamRes;
        do {
            streamRes = kinesisClient.describeStream(describeStreamRequest);
            shards.addAll(streamRes.streamDescription().shards());

            if (shards.size() > 0) {
                lastShardId = shards.get(shards.size() - 1).shardId();
            }
        } while (streamRes.streamDescription().hasMoreShards());

        GetShardIteratorRequest itReq = GetShardIteratorRequest.builder()
                .streamName(streamName)
                .shardIteratorType("TRIM_HORIZON")
                .shardId(lastShardId)
                .build();

        GetShardIteratorResponse shardIteratorResult = kinesisClient.getShardIterator(itReq);
        shardIterator = shardIteratorResult.shardIterator();

        // Continuously read data records from shard.
        List<Record> records;

        // Create new GetRecordsRequest with existing shardIterator.
        // Set maximum records to return to 1000.
        GetRecordsRequest recordsRequest = GetRecordsRequest.builder()
                .shardIterator(shardIterator)
                .limit(1000)
                .build();

        GetRecordsResponse result = kinesisClient.getRecords(recordsRequest);

        // Put result into record list. Result may be empty.
        records = result.records();

        // Print records
        for (Record record : records) {
            SdkBytes byteBuffer = record.data();
            System.out.printf("Seq No: %s - %s%n", record.sequenceNumber(), new String(byteBuffer.asByteArray()));
        }
    }
}

Untuk API detailnya, lihat GetRecordsdi AWS SDK for Java 2.x APIReferensi.

Contoh kode berikut menunjukkan cara menggunakanPutRecord.

SDKuntuk Java 2.x

catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara mengatur dan menjalankannya di AWS Repositori Contoh Kode.


import software.amazon.awssdk.core.SdkBytes;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.kinesis.KinesisClient;
import software.amazon.awssdk.services.kinesis.model.PutRecordRequest;
import software.amazon.awssdk.services.kinesis.model.KinesisException;
import software.amazon.awssdk.services.kinesis.model.DescribeStreamRequest;
import software.amazon.awssdk.services.kinesis.model.DescribeStreamResponse;

/**
 * Before running this Java V2 code example, set up your development
 * environment, including your credentials.
 *
 * For more information, see the following documentation topic:
 *
 * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
 */
public class StockTradesWriter {
    public static void main(String[] args) {
        final String usage = """

                Usage:
                    <streamName>

                Where:
                    streamName - The Amazon Kinesis data stream to which records are written (for example, StockTradeStream)
                """;

        if (args.length != 1) {
            System.out.println(usage);
            System.exit(1);
        }

        String streamName = args[0];
        Region region = Region.US_EAST_1;
        KinesisClient kinesisClient = KinesisClient.builder()
                .region(region)
                .build();

        // Ensure that the Kinesis Stream is valid.
        validateStream(kinesisClient, streamName);
        setStockData(kinesisClient, streamName);
        kinesisClient.close();
    }

    public static void setStockData(KinesisClient kinesisClient, String streamName) {
        try {
            // Repeatedly send stock trades with a 100 milliseconds wait in between.
            StockTradeGenerator stockTradeGenerator = new StockTradeGenerator();

            // Put in 50 Records for this example.
            int index = 50;
            for (int x = 0; x < index; x++) {
                StockTrade trade = stockTradeGenerator.getRandomTrade();
                sendStockTrade(trade, kinesisClient, streamName);
                Thread.sleep(100);
            }

        } catch (KinesisException | InterruptedException e) {
            System.err.println(e.getMessage());
            System.exit(1);
        }
        System.out.println("Done");
    }

    private static void sendStockTrade(StockTrade trade, KinesisClient kinesisClient,
            String streamName) {
        byte[] bytes = trade.toJsonAsBytes();

        // The bytes could be null if there is an issue with the JSON serialization by
        // the Jackson JSON library.
        if (bytes == null) {
            System.out.println("Could not get JSON bytes for stock trade");
            return;
        }

        System.out.println("Putting trade: " + trade);
        PutRecordRequest request = PutRecordRequest.builder()
                .partitionKey(trade.getTickerSymbol()) // We use the ticker symbol as the partition key, explained in
                                                       // the Supplemental Information section below.
                .streamName(streamName)
                .data(SdkBytes.fromByteArray(bytes))
                .build();

        try {
            kinesisClient.putRecord(request);
        } catch (KinesisException e) {
            System.err.println(e.getMessage());
        }
    }

    private static void validateStream(KinesisClient kinesisClient, String streamName) {
        try {
            DescribeStreamRequest describeStreamRequest = DescribeStreamRequest.builder()
                    .streamName(streamName)
                    .build();

            DescribeStreamResponse describeStreamResponse = kinesisClient.describeStream(describeStreamRequest);

            if (!describeStreamResponse.streamDescription().streamStatus().toString().equals("ACTIVE")) {
                System.err.println("Stream " + streamName + " is not active. Please wait a few moments and try again.");
                System.exit(1);
            }

        } catch (KinesisException e) {
            System.err.println("Error found while describing the stream " + streamName);
            System.err.println(e);
            System.exit(1);
        }
    }
}

Untuk API detailnya, lihat PutRecorddi AWS SDK for Java 2.x APIReferensi.

Contoh nirserver

Contoh kode berikut menunjukkan bagaimana menerapkan fungsi Lambda yang menerima peristiwa yang dipicu dengan menerima catatan dari aliran Kinesis. Fungsi mengambil payload Kinesis, mendekode dari Base64, dan mencatat konten rekaman.

SDKuntuk Java 2.x

catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara mengatur dan menjalankannya di repositori contoh Nirserver.

Mengkonsumsi acara Kinesis dengan Lambda menggunakan Java.


// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package example;

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.LambdaLogger;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.services.lambda.runtime.events.KinesisEvent;

public class Handler implements RequestHandler<KinesisEvent, Void> {
    @Override
    public Void handleRequest(final KinesisEvent event, final Context context) {
        LambdaLogger logger = context.getLogger();
        if (event.getRecords().isEmpty()) {
            logger.log("Empty Kinesis Event received");
            return null;
        }
        for (KinesisEvent.KinesisEventRecord record : event.getRecords()) {
            try {
                logger.log("Processed Event with EventId: "+record.getEventID());
                String data = new String(record.getKinesis().getData().array());
                logger.log("Data:"+ data);
                // TODO: Do interesting work based on the new data
            }
            catch (Exception ex) {
                logger.log("An error occurred:"+ex.getMessage());
                throw ex;
            }
        }
        logger.log("Successfully processed:"+event.getRecords().size()+" records");
        return null;
    }

}

Contoh kode berikut menunjukkan cara mengimplementasikan respons batch sebagian untuk fungsi Lambda yang menerima peristiwa dari aliran Kinesis. Fungsi melaporkan kegagalan item batch dalam respons, memberi sinyal ke Lambda untuk mencoba lagi pesan tersebut nanti.

SDKuntuk Java 2.x

catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara mengatur dan menjalankannya di repositori contoh Nirserver.

Melaporkan kegagalan item batch Kinesis dengan Lambda menggunakan Java.


// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.services.lambda.runtime.events.KinesisEvent;
import com.amazonaws.services.lambda.runtime.events.StreamsEventResponse;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class ProcessKinesisRecords implements RequestHandler<KinesisEvent, StreamsEventResponse> {

    @Override
    public StreamsEventResponse handleRequest(KinesisEvent input, Context context) {

        List<StreamsEventResponse.BatchItemFailure> batchItemFailures = new ArrayList<>();
        String curRecordSequenceNumber = "";

        for (KinesisEvent.KinesisEventRecord kinesisEventRecord : input.getRecords()) {
            try {
                //Process your record
                KinesisEvent.Record kinesisRecord = kinesisEventRecord.getKinesis();
                curRecordSequenceNumber = kinesisRecord.getSequenceNumber();

            } catch (Exception e) {
                /* Since we are working with streams, we can return the failed item immediately.
                   Lambda will immediately begin to retry processing from this failed item onwards. */
                batchItemFailures.add(new StreamsEventResponse.BatchItemFailure(curRecordSequenceNumber));
                return new StreamsEventResponse(batchItemFailures);
            }
        }
       
       return new StreamsEventResponse(batchItemFailures);   
    }
}

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