Use Amazon CloudWatch Events

CloudWatch Events delivers a near real-time stream of system events that describe changes in AWS resources to Amazon EC2 instances, Lambda functions, Kinesis streams, Amazon ECS tasks, Step Functions state machines, Amazon SNS topics, Amazon SQS queues, or built-in targets. You can match events and route them to one or more target functions or streams by using simple rules.

Amazon EventBridge is the evolution of CloudWatch Events. Both services use the same API, so you can continue using the CloudWatch Events client provided by the SDK or migrate to the SDK for Java's EventBridge client for CloudWatch Events functionality. CloudWatch Events User Guide documentation and API reference are now available through the EventBridge documentation sites.

Add events

To add custom CloudWatch events, call the CloudWatchEventsClient’s putEvents method with a PutEventsRequest object that contains one or more PutEventsRequestEntry objects that provide details about each event. You can specify several parameters for the entry such as the source and type of the event, resources associated with the event, and so on.

Note

You can specify a maximum of 10 events per call to putEvents .

Imports 

import software.amazon.awssdk.services.cloudwatch.model.CloudWatchException; import software.amazon.awssdk.services.cloudwatchevents.CloudWatchEventsClient; import software.amazon.awssdk.services.cloudwatchevents.model.PutEventsRequest; import software.amazon.awssdk.services.cloudwatchevents.model.PutEventsRequestEntry;

Code 

 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); > >

Add rules

To create or update a rule, call the CloudWatchEventsClient’s putRule method with a PutRuleRequest with the name of the rule and optional parameters such as the event pattern, IAM role to associate with the rule, and a scheduling expression that describes how often the rule is run.

Imports 

import software.amazon.awssdk.services.cloudwatch.model.CloudWatchException; import software.amazon.awssdk.services.cloudwatchevents.CloudWatchEventsClient; import software.amazon.awssdk.services.cloudwatchevents.model.PutRuleRequest; import software.amazon.awssdk.services.cloudwatchevents.model.PutRuleResponse; import software.amazon.awssdk.services.cloudwatchevents.model.RuleState;

Code 

 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); > >

Add targets

Targets are the resources that are invoked when a rule is triggered. Example targets include Amazon EC2 instances, Lambda functions, Kinesis streams, Amazon ECS tasks, Step Functions state machines, and built-in targets.

To add a target to a rule, call the CloudWatchEventsClient’s putTargets method with a PutTargetsRequest containing the rule to update and a list of targets to add to the rule.

Imports 

import software.amazon.awssdk.services.cloudwatch.model.CloudWatchException; import software.amazon.awssdk.services.cloudwatchevents.CloudWatchEventsClient; import software.amazon.awssdk.services.cloudwatchevents.model.PutTargetsRequest; import software.amazon.awssdk.services.cloudwatchevents.model.PutTargetsResponse; import software.amazon.awssdk.services.cloudwatchevents.model.Target;

Code 

 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); > >

More information