CloudWatch Events examples using SDK for Java 2.x

The following code examples show you how to perform actions and implement common scenarios by using the AWS SDK for Java 2.x with CloudWatch Events.

Actions are code excerpts that show you how to call individual CloudWatch Events functions.

Scenarios are code examples that show you how to accomplish a specific task by calling multiple CloudWatch Events functions.

Each example includes a link to GitHub, where you can find instructions on how to set up and run the code in context.

Actions

Adding a Lambda function target

The following code example shows how to add an AWS Lambda function target to an Amazon CloudWatch Events event.

SDK for Java 2.x

    public static void putCWTargets(CloudWatchEventsClient cwe, String ruleName, String functionArn, String targetId ) {

        try {
            Target target = Target.builder()
                .arn(functionArn)
                .id(targetId)
                .build();

            PutTargetsRequest request = PutTargetsRequest.builder()
                .targets(target)
                .rule(ruleName)
                .build();

            PutTargetsResponse response = cwe.putTargets(request);
            System.out.printf(
                "Successfully created CloudWatch events target for rule %s",
                ruleName);

        } catch (CloudWatchException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

• Find instructions and more code on GitHub.

• For API details, see PutTargets in AWS SDK for Java 2.x API Reference.

Create a scheduled rule

The following code example shows how to create an Amazon CloudWatch Events scheduled rule.

SDK for Java 2.x

    public static void putCWRule(CloudWatchEventsClient cwe, String ruleName, String roleArn) {

        try {
            PutRuleRequest request = PutRuleRequest.builder()
                .name(ruleName)
                .roleArn(roleArn)
                .scheduleExpression("rate(5 minutes)")
                .state(RuleState.ENABLED)
                .build();

            PutRuleResponse response = cwe.putRule(request);
            System.out.printf(
                    "Successfully created CloudWatch events rule %s with arn %s",
                    roleArn, response.ruleArn());
        } catch (
            CloudWatchException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

• Find instructions and more code on GitHub.

• For API details, see PutRule in AWS SDK for Java 2.x API Reference.

Send events

The following code example shows how to send Amazon CloudWatch Events events.

SDK for Java 2.x

    public static void putCWEvents(CloudWatchEventsClient cwe, String resourceArn ) {

        try {

            final String EVENT_DETAILS =
                "{ \"key1\": \"value1\", \"key2\": \"value2\" }";

            PutEventsRequestEntry requestEntry = PutEventsRequestEntry.builder()
                    .detail(EVENT_DETAILS)
                    .detailType("sampleSubmitted")
                    .resources(resourceArn)
                    .source("aws-sdk-java-cloudwatch-example")
                    .build();

            PutEventsRequest request = PutEventsRequest.builder()
                    .entries(requestEntry)
                    .build();

            cwe.putEvents(request);
            System.out.println("Successfully put CloudWatch event");

        } catch (CloudWatchException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

• Find instructions and more code on GitHub.

• For API details, see PutEvents in AWS SDK for Java 2.x API Reference.