AWS SDK for Java version 2 - NYJavaSIG 2019-11-21

AWS SDK for Java version 2.x
NY JavaSIG
November 21, 2019

#nyjavasig
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#awssdk
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Transcript

1. Sean Sullivan November 21, 2019 NY JavaSIG AWS SDK for Java version 2.x
2. software engineer Portland Oregon Java Scala About me
3. Agenda SDK for Java 2.x SDK internals Migrating from v1 to v2 Scala and SDK v2
4. AWS SDK for Java
5. SDK v2 announced June 2017 @awsforjava
6. “Under the hood, we use an HTTP client built on top of Netty to make the non- blocking HTTP call” “first class support for non-blocking I/O in our async clients” source: AWS Developer Blog
7. “The AWS SDK for Java 2.0 asynchronous client methods return CompletableFuture objects” source: SDK v2 Developer Guide
8. import java.util.concurrent.CompletableFuture; DynamoDBAsyncClient client = DynamoDBAsyncClient.builder() .region(Region.US_WEST_2) .build(); CompletableFuture<ListTablesResponse> response = client.listTables(ListTablesRequest.builder().build()); CompletableFuture<List<String>> tableNames = response.thenApply(ListTablesResponse::tableNames); tableNames.whenComplete((tables, err) -> { if (tables != null) { tables.forEach(System.out::println); } else { err.printStackTrace(); } }); SDK v2
9. Github projects aws-sdk-java aws-sdk-java-v2
10. SDK v2
11. Pull Request
12. SDK v2 Maven artifacts
13. https://search.maven.org/
14. <dependency> <groupId>com.amazonaws<groupId> <artifactId>aws-java-sdk-dynamodb</artifactId> <version>1.11.679</version> </dependency> Maven dependencies SDK v1 <dependency> <groupId>software.amazon.awssdk<groupId> <artifactId>dynamodb</artifactId> <version>2.10.20</version> </dependency> SDK v2
15. import com.amazonaws.services.cloudwatch.AmazonCloudWatchClient; import com.amazonaws.services.cloudwatch.AmazonCloudWatchClientBuilder; import com.amazonaws.services.cloudwatch.model.MetricDatum; import com.amazonaws.services.cloudwatch.model.PutMetricDataRequest; Java packages SDK v1 import software.amazon.awssdk.services.cloudwatch.CloudWatchAsyncClient; import software.amazon.awssdk.services.cloudwatch.model.MetricDatum; import software.amazon.awssdk.services.cloudwatch.model.PutMetricDataRequest; SDK v2
16. distinct Maven artifact names distinct Java package names SDK v2 and SDK v1 can co-exist in a Java application SDK v1 jar SDK v2 jar
17. SDK v2 programming API • Immutable clients and models • Enhanced pagination • Smart configuration merging • Forward-compatible enums • Streaming operations as first-class concepts
18. SDK internals
19. <slf4j.version>1.7.28</slf4j.version> <jackson.version>2.10.0</jackson.version> <netty.version>4.1.42.Final</netty.version> Transitive dependencies
20. “To provide SDK support for the many services that AWS owns, the AWS SDKs make extensive use of code generation” Code generation https://aws.amazon.com/blogs/developer/aws-sdk-for-java-2-x-released/
21. Why code generation?
22. less boilerplate more consistency Why code generation?
23. class names parameter names method names exception names Consistency error handling logging JSON serialization network I/O
24. AWS SDK for Java v2
25. JavaPoet AWS SDK for Java v2
26. Migrating code from v1 to v2
27. aws-secretsmanager-caching-java
28. https://github.com/aws/aws-secretsmanager-caching-java/
29. “AWS Secrets Manager Java caching client enables in-process caching of secrets for Java applications” aws-secretsmanager-caching-java
30. aws-secretsmanager-caching-java is based on AWS SDK v1
31. https://github.com/aws/aws-secretsmanager-caching-java/issues/
32. how to migrate aws-secretsmanager- caching-java from SDK v1 to SDK v2 ?
33. https://github.com/ aws/aws- secretsmanager- caching-java/pull/6
34. https://github.com/aws/aws-secretsmanager-caching-java/pull/6/files
35. https://github.com/aws/aws-secretsmanager-caching-java/pull/6/files
36. Scala and AWS SDK v2
37. val awsSdkVersion = “2.10.20” "org.scala-lang.modules" %% "scala-java8-compat" % “0.9.0", "software.amazon.awssdk" % "cloudwatch" % awsSdkVersion, "software.amazon.awssdk" % "dynamodb" % awsSdkVersion build.sbt
38. import scala.compat.java8.FutureConverters._ import scala.collection.JavaConverters._
39. FutureConverters?
40. java.util.concurrent.CompletableFuture scala.concurrent.Future
41. FutureConverters.scala
42. migrating a Scala library from AWS SDK v1 to v2
43. “A tiny Scala wrapper around AWS CloudWatch Java client” gfc-aws-cloudwatch
44. https://github.com/gilt/gfc-aws-cloudwatch
45. https://github.com/ gilt/gfc-aws- cloudwatch/pull/8/ files
48. Conclusion SDK v1 — production ready SDK v2 — production ready github.com/aws twitter.com/awsforjava
49. The end
51. Bonus material
52. “Hands-on in the AWS Java Ecosystem” AWS re:Invent 2018
53. “Developing Applications on AWS in the JVM” AWS re:Invent 2017
54. https://www.slideshare.net/AmazonWebServices/ dev205developing-applications-on-aws-in-the-jvm