RecordError.java

Overview

`RecordError.java` defines a simple data container class within the Apache Camel project, specifically in the Kafka resume processor module (`org.apache.camel.processor.resume.kafka`). This class encapsulates details about errors encountered when producing Kafka records. Its primary purpose is to hold both metadata of the Kafka record that failed and the exception that caused the failure, enabling easier error handling and diagnostics in the Kafka producer workflow.

Class: RecordError

Description

`RecordError` is a plain Java object (POJO) that stores information about a failed Kafka record production attempt. It holds two key pieces of data:

• The Kafka record metadata (RecordMetadata) which describes the produced record's topic, partition, offset, and other metadata.

• The exception (Exception) that was thrown during the attempt to produce the record.

This class facilitates passing detailed error information up the call stack or to error handling logic, making it easier to log, analyze, or react to Kafka produce failures.

Package

org.apache.camel.processor.resume.kafka

Properties

Constructors

public RecordError(RecordMetadata recordMetadata, Exception exception)

• Parameters:

  • recordMetadata - the Kafka record metadata associated with the failed record.

  • exception - the exception that was raised during the record production failure.

• Description: Initializes a new RecordError instance with the given record metadata and exception.

Methods

getRecordMetadata

public RecordMetadata getRecordMetadata()

• Returns: RecordMetadata — The metadata of the Kafka record related to the error.

• Description: Retrieves the record metadata encapsulated by this error.

getException

public Exception getException()

• Returns: Exception — The exception that was thrown during record production.

• Description: Retrieves the exception instance describing the failure.

Usage Example

import org.apache.kafka.clients.producer.RecordMetadata;
import org.apache.camel.processor.resume.kafka.RecordError;

try {
    // Code to produce Kafka record
} catch (Exception e) {
    RecordMetadata metadata = ...; // obtain metadata if available
    RecordError error = new RecordError(metadata, e);
    // Handle or log the error
    System.err.println("Failed to produce record at topic " + metadata.topic());
    e.printStackTrace();
}

This example shows how one might catch an exception during Kafka record production and encapsulate the failure details into a `RecordError` object for further processing.

Implementation Details

• The class is immutable: both fields are final and set only through the constructor.

• It directly uses Kafka's RecordMetadata class to hold record information, ensuring compatibility with Kafka producer internals.

• The exception is stored as a generic Exception, allowing any kind of failure to be represented.

• No additional methods such as toString(), equals(), or hashCode() are overridden, reflecting the class’s simple role as a data holder.

Interaction with Other Components

• This class is intended to be used within Kafka producer components of the Apache Camel resume processor.

• Errors during Kafka record production are caught and wrapped into RecordError instances.

• These instances can then be passed to error handling, logging, or retry mechanisms within the system.

• It interacts closely with Kafka client libraries, specifically the RecordMetadata object returned upon producing a record.

• Likely used in conjunction with Kafka producer callbacks or exception handlers in the Camel Kafka integration.

Class Diagram

classDiagram
    class RecordError {
        -RecordMetadata recordMetadata
        -Exception exception
        +RecordError(RecordMetadata recordMetadata, Exception exception)
        +RecordMetadata getRecordMetadata()
        +Exception getException()
    }

    RecordError --> RecordMetadata : uses

Summary

`RecordError.java` is a simple yet essential utility class designed to capture and convey detailed information about Kafka record production failures in Apache Camel's Kafka resume processor module. It encapsulates both the Kafka record metadata and the exception thrown, enabling effective error management and troubleshooting within Kafka producer workflows.