Amazon SNS 消息批处理

本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。

本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。

什么是消息批处理？

在各个 Publish API 请求中向标准或 FIFO 主题发布消息的替代方法，该方法使用 Amazon SNS PublishBatch API 在单个 API 请求中最多发布 10 条消息。批量发送消息可以帮助您利用 Amazon SNS 将与连接分布式应用程序（A2A 消息收发）或者向人们发送通知（A2P 消息收发）相关的成本最高降低 10 倍。根据您运营所在区域，Amazon SNS 对每秒可以向某个主题发布的消息数量设定了配额。有关 API 限额的更多信息，请参阅《AWS 一般参考》中的 Amazon SNS 端点和限额页面。

消息批处理是如何工作的？

使用 PublishBatch API 发布消息与使用 Publish API 发布消息类似。主要的区别在于，需要给 PublishBatch API 请求中的每条消息分配一个唯一的批处理 ID（最多 80 个字符）。这样，Amazon SNS 可以为批处理中的每条消息返回单独的 API 响应，以确认每条消息均已发布或发生故障。对于发布到 FIFO 主题的消息，除了包括分配唯一的批处理 ID 之外，还需要为每条单独的消息包括 MessageDeduplicationID 和 MessageGroupId。

示例

向 FIFO 主题发布一批 10 条的消息

// Imports
import software.amazon.awssdk.services.sns.SnsClient;
import software.amazon.awssdk.services.sns.model.PublishBatchRequest;
import software.amazon.awssdk.services.sns.model.PublishBatchRequestEntry;
import software.amazon.awssdk.services.sns.model.PublishBatchResponse;
import software.amazon.awssdk.services.sns.model.SnsException;

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

// Code
private static final int MAX_BATCH_SIZE = 10;

public static void publishBatchToTopic(SnsClient snsClient, String topicArn, int batchSize) {
    try {
        // Validate the batch size
        if (batchSize > MAX_BATCH_SIZE) {
            throw new IllegalArgumentException("Batch size cannot exceed " + MAX_BATCH_SIZE);
        }

        // Create the batch entries
        List<PublishBatchRequestEntry> entries = IntStream.range(0, batchSize)
                .mapToObj(i -> PublishBatchRequestEntry.builder()
                        .id("id" + i)
                        .message("message" + i)
                        .build())
                .collect(Collectors.toList());

        // Build the batch request
        PublishBatchRequest request = PublishBatchRequest.builder()
                .topicArn(topicArn)
                .publishBatchRequestEntries(entries)
                .build();

        // Publish the batch request
        PublishBatchResponse response = snsClient.publishBatch(request);

        // Handle successful messages
        response.successful().forEach(success -> {
            System.out.println("Successful Batch Id: " + success.id());
            System.out.println("Message Id: " + success.messageId());
        });

        // Handle failed messages
        response.failed().forEach(failure -> {
            System.err.println("Failed Batch Id: " + failure.id());
            System.err.println("Error Code: " + failure.code());
            System.err.println("Sender Fault: " + failure.senderFault());
            System.err.println("Error Message: " + failure.message());
        });

    } catch (SnsException e) {
        // Log and handle exceptions
        System.err.println("SNS Exception: " + e.awsErrorDetails().errorMessage());
    } catch (IllegalArgumentException e) {
        System.err.println("Validation Error: " + e.getMessage());
    }
}            

向 FIFO 主题发布一批 10 条的消息

// Imports
import software.amazon.awssdk.services.sns.SnsClient;
import software.amazon.awssdk.services.sns.model.PublishBatchRequest;
import software.amazon.awssdk.services.sns.model.PublishBatchRequestEntry;
import software.amazon.awssdk.services.sns.model.PublishBatchResponse;
import software.amazon.awssdk.services.sns.model.BatchResultErrorEntry;
import software.amazon.awssdk.services.sns.model.SnsException;

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

// Code
private static final int MAX_BATCH_SIZE = 10;

public static void publishBatchToFifoTopic(SnsClient snsClient, String topicArn) {
    try {
        // Create the batch entries to send
        List<PublishBatchRequestEntry> entries = IntStream.range(0, MAX_BATCH_SIZE)
                .mapToObj(i -> PublishBatchRequestEntry.builder()
                        .id("id" + i)
                        .message("message" + i)
                        .messageGroupId("groupId")
                        .messageDeduplicationId("deduplicationId" + i)
                        .build())
                .collect(Collectors.toList());

        // Create the batch request
        PublishBatchRequest request = PublishBatchRequest.builder()
                .topicArn(topicArn)
                .publishBatchRequestEntries(entries)
                .build();

        // Publish the batch request
        PublishBatchResponse response = snsClient.publishBatch(request);

        // Handle the successfully sent messages
        response.successful().forEach(success -> {
            System.out.println("Batch Id for successful message: " + success.id());
            System.out.println("Message Id for successful message: " + success.messageId());
            System.out.println("Sequence Number for successful message: " + success.sequenceNumber());
        });

        // Handle the failed messages
        response.failed().forEach(failure -> {
            System.err.println("Batch Id for failed message: " + failure.id());
            System.err.println("Error Code for failed message: " + failure.code());
            System.err.println("Sender Fault for failed message: " + failure.senderFault());
            System.err.println("Failure Message for failed message: " + failure.message());
        });

    } catch (SnsException e) {
        // Handle any exceptions from the request
        System.err.println("SNS Exception: " + e.awsErrorDetails().errorMessage());
    }
}