Amazon Kinesis Client Library for Java framework
Amazon Kinesis Client Library for Java framework
Amazon Kinesis Client Library for Java is a advanced library for processing and reading Amazon Kinesis data streams.It provides developers with a tool for building a distributed, high available, and fault tolerance.This article will introduce the basic concepts, usage methods, and some example code of Amazon Kinesis Client Library for Java framework.
1 Overview
Amazon Kinesis is a custody service for collecting, processing and analyzing real -time data.Amazon Kinesis Client Library for Java is a development toolkit to simplify the process of developing applications for developers to build applications for Kinesis data flow.The library provides a set of powerful APIs and tools that allows you to easily process data records and achieve streaming processing and interact with Kinesis.
2. Core concept
Amazon Kinesis Client Library for Java framework is based on the following core concepts:
-Cord: The smallest unit in the data stream, it contains the main valid load and metadata.You can use this library to read and process these data records.
-Consumer: Read the entity of data records with Kinesis data flowing.The KCL framework provides a rotation method to obtain data records and distributes based on the needs of consumer applications.
-Processor: Customized classes written by developers to process data records received.The processing program will automatically work with consumers to achieve distributed processing and fault tolerance.
3. How to use
The following are the basic steps to use Amazon Kinesis Client Library for Java framework:
-Ad the dependency item of adding a KCL framework to your Java application.
-Coloning a processing program that implements the RecordProcessor interface.The interface defines the logic of processing data records.
-Colon a Configuration object with related parameters of consumer applications, such as AWS vouchers, data flow names, etc.
-Colon a KinesISCLIENTLIBCONFIGURATION object and pass the above Configuration objects, as well as relevant information about the Kinesis data stream.
-In the following ways to create KinesISISCLINTLIBClientBuilder objects for initialization and creation of Kinesis consumers.
KinesisClientLibClientBuilder builder = new KinesisClientLibClientBuilder();
builder.recordProcessorFactory(new YourRecordProcessorFactory());
builder.kinesisClientConfig(configuration);
builder.dynamoDBClient(dynamoDBClient);
builder.cloudWatchClient(cloudWatchClient);
-The configuration and initialization KineSis consumers and register your processing program.
KinesisClientLibClient client = builder.build();
client.start();
4. Example code
The following is a simple example code that shows how to use the KCL framework to create a consumer application and process the data record:
import com.amazonaws.services.kinesis.clientlibrary.interfaces.IRecordProcessor;
// Custom processor class to implement IRCORDPROCESSOR interface
class MyRecordProcessor implements IRecordProcessor {
public void initialize(String shardId) {
// Initialize the method, you can define initialization logic here
}
public void processRecords(List<Record> records, IRecordProcessorCheckpointer checkpointer) {
// Processing the logic of data records
for (Record record : records) {
ByteBuffer data = record.getData();
// Extract the effective load from the Record and perform the corresponding processing
// ...
}
// Manually save CheckpoIinter status
try {
checkpointer.checkpoint();
} catch (Exception e) {
// Treatment of preservation failure abnormality
// ...
}
}
public void shutdown(IRecordProcessorCheckpointer checkpointer, ShutdownReason reason) {
// Close the method, handle the clearing and closing logic here
if (reason == ShutdownReason.TERMINATE) {
// Treatment end
} else {
// Treatment of other closing reasons
}
}
}
// Entry class
public class KinesisConsumerApplication {
public static void main(String[] args) {
// Create the Configuration object and configure related parameters
AWSCredentialsProvider credentialsProvider = new DefaultAWSCredentialsProviderChain();
String streamName = "yourStreamName";
// Create KineSISISCLINTLIBCONFIGUTION objects, pass the above Configuration object and data flow information
KinesisClientLibConfiguration kclConfig = new KinesisClientLibConfiguration(
"yourApplicationName", streamName, credentialsProvider, "workerId"
);
// Create Kinesis consumers
KinesisClientLibClientBuilder builder = KinesisClientLibClientBuilder.standard();
builder.recordProcessorFactory(() -> new MyRecordProcessor());
builder.kinesisClientConfig(kclConfig);
builder.dynamoDBClient(new AmazonDynamoDBClient(credentialsProvider));
builder.cloudWatchClient(new AmazonCloudWatchClient(credentialsProvider));
// Initialize and start consumers
KinesisClientLibClient client = builder.build();
client.start();
}
}
Through this article, you have learned about the basic concepts, usage methods and example code of Amazon Kinesis Client Library for Java framework.This lightweight framework enables you to easily build a retractable real -time data processing application and help you process and read data records in the Amazon Kinesis data stream.
