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| public static AmazonS3 getS3Client() { | ||
| return AmazonS3ClientBuilder.standard().withRegion(Regions.DEFAULT_REGION).build(); |
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This code is written so that the client cannot be reused across invocations of the Lambda function.
To improve the performance of the Lambda function, consider using static initialization/constructor, global/static variables and singletons. It allows to keep alive and reuse HTTP connections that were established during a previous invocation.
Learn more about best practices for working with AWS Lambda functions.
| final AmazonS3 s3Client = EventHandler.getS3Client(); | ||
| logger.log("Processing Bucket: " + bucketName); | ||
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| ObjectListing files = s3Client.listObjects(bucketName); |
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This code uses an outdated API. ListObjectsV2 is the revised List Objects API, and we recommend you use this revised API for new application developments.
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| long expirationTime = System.currentTimeMillis() + Duration.ofMinutes(1).toMillis(); | ||
| while(System.currentTimeMillis() < expirationTime) { | ||
| if (s3Client.doesObjectExist(Constants.SUMMARY_BUCKET, summaryUpdateName)) { |
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This code appears to be waiting for a resource before it runs. You could use the waiters feature to help improve efficiency. Consider using ObjectExists or ObjectNotExists. For more information, see https://aws.amazon.com/blogs/developer/waiters-in-the-aws-sdk-for-java/
| final AmazonS3 s3Client = EventHandler.getS3Client(); | ||
| logger.log("Processing Bucket: " + bucketName); | ||
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| ObjectListing files = s3Client.listObjects(bucketName); |
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This code might not produce accurate results if the operation returns paginated results instead of all results. Consider adding another call to check for additional results.
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copy EventHandler.java file into shipmentEvents/demo