lambda CDK stack with canary rollout using CodeDeploy

ExampleLambdaStack.java

package com.example;

import software.amazon.awscdk.core.Construct;
import software.amazon.awscdk.core.Duration;
import software.amazon.awscdk.core.Stack;
import software.amazon.awscdk.core.StackProps;
import software.amazon.awscdk.services.iam.User;
import software.amazon.awscdk.services.iam.Role;
import software.amazon.awscdk.services.iam.RoleProps;
import software.amazon.awscdk.services.iam.ServicePrincipal;
import software.amazon.awscdk.services.lambda.Alias;
import software.amazon.awscdk.services.lambda.AliasProps;
import software.amazon.awscdk.services.lambda.Code;
import software.amazon.awscdk.services.lambda.Function;
import software.amazon.awscdk.services.lambda.FunctionProps;
import software.amazon.awscdk.services.lambda.Runtime;
import software.amazon.awscdk.services.lambda.Version;
import software.amazon.awscdk.services.lambda.VersionProps;
import software.amazon.awscdk.services.codedeploy.LambdaApplication;
import software.amazon.awscdk.services.codedeploy.LambdaDeploymentConfig;
import software.amazon.awscdk.services.codedeploy.LambdaDeploymentGroup;
import software.amazon.awscdk.services.codedeploy.LambdaDeploymentGroupProps;

public class ExampleLambdaStack extends Stack {
    public ExampleLambdaStack(final Construct parent, final String id, String lambdaJarChecksum) {
        this(parent, id, lambdaJarChecksum, null);
    }

    public ExampleLambdaStack(final Construct parent, final String id, String lambdaJarChecksum, final StackProps props) {
        super(parent, id, props);

        String path = "target/debug/HelloLambda_deploy.jar";
        String klass = "com.example.helloLambda.Handler";
        int memory = 128;
        Runtime runtime = Runtime.JAVA_8;
        String aliasName = "prod";

        RoleProps roleProps = new RoleProps.Builder()
            .assumedBy(new ServicePrincipal("lambda.amazonaws.com"))
            .roleName(id)
            .build();
        Role role = new Role(this, id + "-role", roleProps);

        FunctionProps functionProps = new FunctionProps.Builder()
            .code(Code.fromAsset(path))
            .functionName(id)
            .runtime(runtime)
            .handler(klass)
            .memorySize(memory)
            .role(role)
            .build();
        Function function = new Function(this, id + "-function", functionProps);

        Version version = function.addVersion(lambdaJarChecksum); // not using checksum for validation, just stack id

        AliasProps aliasProps = new AliasProps.Builder()
            .aliasName(aliasName)
            .version(version)
            .build();
        Alias alias = new Alias(this, id + "-function-alias", aliasProps);

        LambdaApplication app = new LambdaApplication(this, id + "-codedeploy-application");

        LambdaDeploymentGroupProps groupProps = new LambdaDeploymentGroupProps.Builder()
            .alias(alias)
            .application(app)
            .deploymentConfig(LambdaDeploymentConfig.CANARY_10_PERCENT_5_MINUTES)
            .deploymentGroupName(id)
            .build();
        LambdaDeploymentGroup group = new LambdaDeploymentGroup(this, id + "-codedeploy-deployment-group", groupProps);
    }
}