Invoking AWS Lambda from a Java Client

plugins {
    id 'java'
}

group 'com.shunya'
version '1.0-SNAPSHOT'

sourceCompatibility = 1.8

repositories {
    mavenCentral()
}

dependencies {
    compile group: 'com.amazonaws', name: 'aws-java-sdk-lambda', version: '1.11.546'
    testCompile group: 'junit', name: 'junit', version: '4.12'
}

public class LambdaInput {

    private long input;

    public long getInput() {
        return input;
    }

    public void setInput(long input) {
        this.input = input;
    }
}

public class LambdaOutput {

    private long result;

    public long getResult() {
        return result;
    }

    public void setResult(long result) {
        this.result = result;
    }
}

import com.amazonaws.services.lambda.invoke.LambdaFunction;

public interface NumberService {

    @LambdaFunction(functionName = "number-reversal-java") (1)
    LambdaOutput reverse(LambdaInput input);
}

import com.amazonaws.services.lambda.AWSLambdaClientBuilder;
import com.amazonaws.services.lambda.invoke.LambdaInvokerFactory;

public class LambdaClient {

    public static void main(String[] args) {
        final NumberService numberService = LambdaInvokerFactory.builder()
                .lambdaClient(AWSLambdaClientBuilder.defaultClient())
                .build(NumberService.class);

        LambdaInput request = new LambdaInput();
        request.setInput(12345);
        final LambdaOutput lambdaOutput = numberService.reverse(request);
        System.out.println("lambda response = " + lambdaOutput.getResult());
    }
}