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AWS SDK for Java version 2 - NYJavaSIG 2019-11-21
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sullis
November 21, 2019
Programming
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AWS SDK for Java version 2 - NYJavaSIG 2019-11-21
AWS SDK for Java version 2.x
NY JavaSIG
November 21, 2019
#nyjavasig
#awscloud
#awssdk
#java
sullis
November 21, 2019
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Transcript
Sean Sullivan November 21, 2019 NY JavaSIG AWS SDK for
Java version 2.x
software engineer Portland Oregon Java Scala About me
Agenda SDK for Java 2.x SDK internals Migrating from v1
to v2 Scala and SDK v2
AWS SDK for Java
SDK v2 announced June 2017 @awsforjava
“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
“The AWS SDK for Java 2.0 asynchronous client methods return
CompletableFuture objects” source: SDK v2 Developer Guide
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
Github projects aws-sdk-java aws-sdk-java-v2
SDK v2
Pull Request
SDK v2 Maven artifacts
https://search.maven.org/
<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
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
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
SDK v2 programming API • Immutable clients and models •
Enhanced pagination • Smart configuration merging • Forward-compatible enums • Streaming operations as first-class concepts
SDK internals
<slf4j.version>1.7.28</slf4j.version> <jackson.version>2.10.0</jackson.version> <netty.version>4.1.42.Final</netty.version> Transitive dependencies
“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/
Why code generation?
less boilerplate more consistency Why code generation?
class names parameter names method names exception names Consistency error
handling logging JSON serialization network I/O
AWS SDK for Java v2
JavaPoet AWS SDK for Java v2
Migrating code from v1 to v2
aws-secretsmanager-caching-java
https://github.com/aws/aws-secretsmanager-caching-java/
“AWS Secrets Manager Java caching client enables in-process caching of
secrets for Java applications” aws-secretsmanager-caching-java
aws-secretsmanager-caching-java is based on AWS SDK v1
https://github.com/aws/aws-secretsmanager-caching-java/issues/
how to migrate aws-secretsmanager- caching-java from SDK v1 to SDK
v2 ?
https://github.com/ aws/aws- secretsmanager- caching-java/pull/6
https://github.com/aws/aws-secretsmanager-caching-java/pull/6/files
https://github.com/aws/aws-secretsmanager-caching-java/pull/6/files
Scala and AWS SDK v2
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
import scala.compat.java8.FutureConverters._ import scala.collection.JavaConverters._
FutureConverters?
java.util.concurrent.CompletableFuture scala.concurrent.Future
FutureConverters.scala
migrating a Scala library from AWS SDK v1 to v2
“A tiny Scala wrapper around AWS CloudWatch Java client” gfc-aws-cloudwatch
https://github.com/gilt/gfc-aws-cloudwatch
https://github.com/ gilt/gfc-aws- cloudwatch/pull/8/ files
None
None
Conclusion SDK v1 — production ready SDK v2 — production
ready github.com/aws twitter.com/awsforjava
The end
None
Bonus material
“Hands-on in the AWS Java Ecosystem” AWS re:Invent 2018
“Developing Applications on AWS in the JVM” AWS re:Invent 2017
https://www.slideshare.net/AmazonWebServices/ dev205developing-applications-on-aws-in-the-jvm