feat: Java :implementation of classic load balancer sample #187
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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 | ||
| 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 | ||
| 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 | ||
| 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 | ||
| entry point of your application. After changing your Java code, you will be able | ||
| to run the CDK toolkit commands as usual (Maven will recompile as needed): | ||
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| $ cdk ls | ||
| <list all stacks in this program> | ||
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| $ cdk synth | ||
| <cloudformation template> | ||
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| $ cdk deploy | ||
| <deploy stack to your account> | ||
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| $ cdk diff | ||
| <diff against deployed stack> |
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| { | ||
| "app": "mvn exec:java -Dexec.mainClass=software.amazon.awscdk.examples.ClassicLoadBalancerApp" | ||
| } |
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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"> | ||
| <modelVersion>4.0.0</modelVersion> | ||
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| <groupId>com.amazonaws.cdk</groupId> | ||
| <artifactId>classic-load-balancer</artifactId> | ||
| <version>1.0.0</version> | ||
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| <properties> | ||
| <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> | ||
| </properties> | ||
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| <build> | ||
| <plugins> | ||
| <plugin> | ||
| <groupId>org.apache.maven.plugins</groupId> | ||
| <artifactId>maven-compiler-plugin</artifactId> | ||
| <version>3.8.1</version> | ||
| <configuration> | ||
| <source>1.8</source> | ||
| <target>1.8</target> | ||
| </configuration> | ||
| </plugin> | ||
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| <plugin> | ||
| <groupId>org.apache.maven.plugins</groupId> | ||
| <artifactId>maven-assembly-plugin</artifactId> | ||
| <version>3.1.0</version> | ||
| <configuration> | ||
| <descriptorRefs> | ||
| <descriptorRef>jar-with-dependencies</descriptorRef> | ||
| </descriptorRefs> | ||
| <archive> | ||
| <manifest> | ||
| <mainClass>com.amazonaws.cdk.examples.ClassicLoadBalancerApp</mainClass> | ||
| </manifest> | ||
| </archive> | ||
| </configuration> | ||
| <executions> | ||
| <execution> | ||
| <id>make-assembly</id> <!-- this is used for inheritance merges --> | ||
| <phase>package</phase> <!-- bind to the packaging phase --> | ||
| <goals> | ||
| <goal>single</goal> | ||
| </goals> | ||
| </execution> | ||
| </executions> | ||
| </plugin> | ||
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| </plugins> | ||
| </build> | ||
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| <dependencies> | ||
| <dependency> | ||
| <groupId>software.amazon.awscdk</groupId> | ||
| <artifactId>core</artifactId> | ||
| <version>[1.0.0,)</version> | ||
| </dependency> | ||
| <dependency> | ||
| <groupId>software.amazon.awscdk</groupId> | ||
| <artifactId>ec2</artifactId> | ||
| <version>[1.0.0,)</version> | ||
| </dependency> | ||
| <dependency> | ||
| <groupId>software.amazon.awscdk</groupId> | ||
| <artifactId>autoscaling</artifactId> | ||
| <version>[1.0.0,)</version> | ||
| </dependency> | ||
| <dependency> | ||
| <groupId>software.amazon.awscdk</groupId> | ||
| <artifactId>elasticloadbalancing</artifactId> | ||
| <version>[1.0.0,)</version> | ||
| </dependency> | ||
| <!-- https://mvnrepository.com/artifact/junit/junit --> | ||
| <dependency> | ||
| <groupId>junit</groupId> | ||
| <artifactId>junit</artifactId> | ||
| <version>4.12</version> | ||
| <scope>test</scope> | ||
| <exclusions> | ||
| <exclusion> | ||
| <groupId>org.hamcrest</groupId> | ||
| <artifactId>hamcrest-core</artifactId> | ||
| </exclusion> | ||
| </exclusions> | ||
| </dependency> | ||
| <dependency> | ||
| <groupId>org.hamcrest</groupId> | ||
| <artifactId>hamcrest-library</artifactId> | ||
| <version>1.3</version> | ||
| <scope>test</scope> | ||
| </dependency> | ||
| </dependencies> | ||
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| </project> |
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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{ | ||
| public static void main(final String[] args) { | ||
| 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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| package software.amazon.awscdk.examples; | ||
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| 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.ec2.Vpc; | ||
| import software.amazon.awscdk.services.autoscaling.AutoScalingGroup; | ||
| import software.amazon.awscdk.services.ec2.AmazonLinuxImage; | ||
| import software.amazon.awscdk.services.autoscaling.AutoScalingGroup.Builder; | ||
| import software.amazon.awscdk.services.ec2.InstanceType; | ||
| import software.amazon.awscdk.services.ec2.InstanceClass; | ||
| import software.amazon.awscdk.services.ec2.InstanceSize; | ||
| import software.amazon.awscdk.services.elasticloadbalancing.LoadBalancer; | ||
| import software.amazon.awscdk.services.elasticloadbalancing.HealthCheck; | ||
| import software.amazon.awscdk.services.elasticloadbalancing.LoadBalancerListener; | ||
| import software.amazon.awscdk.services.elasticloadbalancing.ListenerPort; | ||
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| /** | ||
| * Classic Load balance CDK example for Java! | ||
| */ | ||
| class ClassicLoadBalancerStack extends Stack { | ||
| public ClassicLoadBalancerStack(final Construct parent, final String name) { | ||
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Contributor
There was a problem hiding this comment. add a parameterized constructor and call it with null: public ClassicLoadBalancerStack(final Construct parent, final String name, final StackProps props) {
super(scope, name, props);
}
public ClassicLoadBalancerStack(final Construct parent, final String name) {
super(scope, name, null);
// code
}
Contributor
There was a problem hiding this comment. use
Contributor
Author
There was a problem hiding this comment. Added the constructor |
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| super(parent, name, null); | ||
| } | ||
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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") | ||
| .vpc(vpc) | ||
| .instanceType(InstanceType.of(InstanceClass.BURSTABLE2, InstanceSize.MICRO)) | ||
| .machineImage(new AmazonLinuxImage()) | ||
| .build(); | ||
| HealthCheck.Builder healthCheckBuilder = new HealthCheck.Builder(); | ||
| HealthCheck healthCheck = healthCheckBuilder.port(80).build(); | ||
| LoadBalancer lb = LoadBalancer.Builder.create(this,"LB") | ||
| .vpc(vpc) | ||
| .internetFacing(Boolean.TRUE) | ||
| .healthCheck(healthCheck) | ||
| .build(); | ||
| lb.addTarget(asg); | ||
| ListenerPort listenerPort = lb.addListener(LoadBalancerListener.builder().externalPort(80).build()); | ||
| listenerPort.getConnections().allowDefaultPortFromAnyIpv4("Open to the world"); | ||
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| } | ||
| } | ||
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Use CamelCase for the Stack id cdk-classic-load-balancer-example, can be shorter
MyLBStackor myClassicLoadBalancerStackThere was a problem hiding this comment.
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I have checked the other examples where are in master and none of them are camel case and hence I want to be consistent with them. Let me know if we are now drifting from this and if so would the other examples get fixed as well?
Examples are : hello-world, lambda-cron