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feat: Java :implementation of classic load balancer sample (#187)
* Java implementation of classic load balancer Co-authored-by: netanir <[email protected]> Co-authored-by: Noah Litov <[email protected]>
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‎java/classic-load-balancer/README.md‎

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# CDK Java Example
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This is an example of a CDK program written in Java.
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## Building
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To build this app, run `mvn compile`. This will download the required
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dependencies to compile the Java code.
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You can use your IDE to write code and unit tests, but you will need to use the
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CDK toolkit if you wish to synthesize/deploy stacks.
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## CDK Toolkit
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The [`cdk.json`](./cdk.json) file in the root of this repository includes
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instructions for the CDK toolkit on how to execute this program.
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Specifically, it will tell the toolkit to use the `mvn exec:java` command as the
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entry point of your application. After changing your Java code, you will be able
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to run the CDK toolkit commands as usual (Maven will recompile as needed):
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$ cdk ls
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<list all stacks in this program>
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$ cdk synth
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<cloudformation template>
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$ cdk deploy
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<deploy stack to your account>
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$ cdk diff
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<diff against deployed stack>

‎java/classic-load-balancer/cdk.json‎

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{
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"app": "mvn exec:java -Dexec.mainClass=software.amazon.awscdk.examples.ClassicLoadBalancerApp"
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}

‎java/classic-load-balancer/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.amazonaws.cdk</groupId>
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<artifactId>classic-load-balancer</artifactId>
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<version>1.0.0</version>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.8.1</version>
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<configuration>
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<source>1.8</source>
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<target>1.8</target>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-assembly-plugin</artifactId>
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<version>3.1.0</version>
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<configuration>
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<descriptorRefs>
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<descriptorRef>jar-with-dependencies</descriptorRef>
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</descriptorRefs>
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<archive>
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<manifest>
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<mainClass>com.amazonaws.cdk.examples.ClassicLoadBalancerApp</mainClass>
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</manifest>
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</archive>
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</configuration>
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<executions>
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<execution>
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<id>make-assembly</id> <!-- this is used for inheritance merges -->
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<phase>package</phase> <!-- bind to the packaging phase -->
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<goals>
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<goal>single</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<dependency>
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<groupId>software.amazon.awscdk</groupId>
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<artifactId>core</artifactId>
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<version>[1.0.0,)</version>
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</dependency>
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<dependency>
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<groupId>software.amazon.awscdk</groupId>
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<artifactId>ec2</artifactId>
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<version>[1.0.0,)</version>
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</dependency>
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<dependency>
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<groupId>software.amazon.awscdk</groupId>
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<artifactId>autoscaling</artifactId>
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<version>[1.0.0,)</version>
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</dependency>
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<dependency>
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<groupId>software.amazon.awscdk</groupId>
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<artifactId>elasticloadbalancing</artifactId>
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<version>[1.0.0,)</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/junit/junit -->
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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<scope>test</scope>
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<exclusions>
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<exclusion>
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<groupId>org.hamcrest</groupId>
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<artifactId>hamcrest-core</artifactId>
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</exclusion>
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</exclusions>
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</dependency>
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<dependency>
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<groupId>org.hamcrest</groupId>
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<artifactId>hamcrest-library</artifactId>
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<version>1.3</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>

‎java/classic-load-balancer/src/main/java/software/amazon/awscdk/examples/ClassicLoadBalancerApp.java‎

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package software.amazon.awscdk.examples;
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import software.amazon.awscdk.core.App;
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public class ClassicLoadBalancerApp{
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public static void main(final String[] args) {
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App app = new App();
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new ClassicLoadBalancerStack(app, "cdk-classic-load-balancer-example");
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app.synth();
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}
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}

‎java/classic-load-balancer/src/main/java/software/amazon/awscdk/examples/ClassicLoadBalancerStack.java‎

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package software.amazon.awscdk.examples;
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import software.amazon.awscdk.core.Construct;
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import software.amazon.awscdk.core.Duration;
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import software.amazon.awscdk.core.Stack;
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import software.amazon.awscdk.core.StackProps;
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import software.amazon.awscdk.services.ec2.Vpc;
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import software.amazon.awscdk.services.autoscaling.AutoScalingGroup;
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import software.amazon.awscdk.services.ec2.AmazonLinuxImage;
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import software.amazon.awscdk.services.autoscaling.AutoScalingGroup.Builder;
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import software.amazon.awscdk.services.ec2.InstanceType;
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import software.amazon.awscdk.services.ec2.InstanceClass;
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import software.amazon.awscdk.services.ec2.InstanceSize;
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import software.amazon.awscdk.services.elasticloadbalancing.LoadBalancer;
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import software.amazon.awscdk.services.elasticloadbalancing.HealthCheck;
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import software.amazon.awscdk.services.elasticloadbalancing.LoadBalancerListener;
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import software.amazon.awscdk.services.elasticloadbalancing.ListenerPort;
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/**
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* Classic Load balance CDK example for Java!
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*/
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class ClassicLoadBalancerStack extends Stack {
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public ClassicLoadBalancerStack(final Construct parent, final String name) {
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super(parent, name, null);
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}
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public ClassicLoadBalancerStack(final Construct parent, final String name, final StackProps props) {
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super(parent, name, props);
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Vpc vpc = new Vpc(this, "VPC");
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AutoScalingGroup asg = AutoScalingGroup.Builder.create(this,"ASG")
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.vpc(vpc)
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.instanceType(InstanceType.of(InstanceClass.BURSTABLE2, InstanceSize.MICRO))
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.machineImage(new AmazonLinuxImage())
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.build();
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HealthCheck.Builder healthCheckBuilder = new HealthCheck.Builder();
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HealthCheck healthCheck = healthCheckBuilder.port(80).build();
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LoadBalancer lb = LoadBalancer.Builder.create(this,"LB")
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.vpc(vpc)
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.internetFacing(Boolean.TRUE)
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.healthCheck(healthCheck)
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.build();
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lb.addTarget(asg);
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ListenerPort listenerPort = lb.addListener(LoadBalancerListener.builder().externalPort(80).build());
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listenerPort.getConnections().allowDefaultPortFromAnyIpv4("Open to the world");
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}
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}

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