There are more AWS SDK examples available in the [AWS Doc SDK Examples](https://github.com/awsdocs/aws-doc-sdk-examples) GitHub repo.

# EventBridge examples using SDK for Kotlin
<a name="kotlin_1_eventbridge_code_examples"></a>

The following code examples show you how to perform actions and implement common scenarios by using the AWS SDK for Kotlin with EventBridge.

*Basics* are code examples that show you how to perform the essential operations within a service.

*Actions* are code excerpts from larger programs and must be run in context. While actions show you how to call individual service functions, you can see actions in context in their related scenarios.

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

**Topics**
+ [Get started](#get_started)
+ [Basics](#basics)
+ [Actions](#actions)

## Get started
<a name="get_started"></a>

### Hello EventBridge
<a name="eventbridge_Hello_kotlin_1_topic"></a>

The following code example shows how to get started using EventBridge.

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/eventbridge#code-examples). 

```
import aws.sdk.kotlin.services.eventbridge.EventBridgeClient
import aws.sdk.kotlin.services.eventbridge.model.ListEventBusesRequest
import aws.sdk.kotlin.services.eventbridge.model.ListEventBusesResponse

suspend fun main() {
    listBusesHello()
}

suspend fun listBusesHello() {
    val request =
        ListEventBusesRequest {
            limit = 10
        }

    EventBridgeClient.fromEnvironment { region = "us-west-2" }.use { eventBrClient ->
        val response: ListEventBusesResponse = eventBrClient.listEventBuses(request)
        response.eventBuses?.forEach { bus ->
            println("The name of the event bus is ${bus.name}")
            println("The ARN of the event bus is ${bus.arn}")
        }
    }
}
```
+  For API details, see [ListEventBuses](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*. 

## Basics
<a name="basics"></a>

### Learn the basics
<a name="eventbridge_Scenario_GettingStarted_kotlin_1_topic"></a>

The following code example shows how to:
+ Create a rule and add a target to it.
+ Enable and disable rules.
+ List and update rules and targets.
+ Send events, then clean up resources.

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/eventbridge#code-examples). 

```
/*
 Before running this Kotlin code example, set up your development environment,
 including your credentials.

 For more information, see the following documentation topic:
 https://docs.aws.amazon.com/sdk-for-kotlin/latest/developer-guide/setup.html

 This Kotlin example performs the following tasks with Amazon EventBridge:

 1. Creates an AWS Identity and Access Management (IAM) role to use with Amazon EventBridge.
 2. Creates an Amazon Simple Storage Service (Amazon S3) bucket with EventBridge events enabled.
 3. Creates a rule that triggers when an object is uploaded to Amazon S3.
 4. Lists rules on the event bus.
 5. Creates a new Amazon Simple Notification Service (Amazon SNS) topic and lets the user subscribe to it.
 6. Adds a target to the rule that sends an email to the specified topic.
 7. Creates an EventBridge event that sends an email when an Amazon S3 object is created.
 8. Lists targets.
 9. Lists the rules for the same target.
 10. Triggers the rule by uploading a file to the S3 bucket.
 11. Disables a specific rule.
 12. Checks and prints the state of the rule.
 13. Adds a transform to the rule to change the text of the email.
 14. Enables a specific rule.
 15. Triggers the updated rule by uploading a file to the S3 bucket.
 16. Updates the rule to a custom rule pattern.
 17. Sends an event to trigger the rule.
 18. Cleans up resources.
*/
val DASHES: String = String(CharArray(80)).replace("\u0000", "-")

suspend fun main(args: Array<String>) {
    val usage = """
    Usage:
        <roleName> <bucketName> <topicName> <eventRuleName>

    Where:
        roleName - The name of the role to create.
        bucketName - The Amazon Simple Storage Service (Amazon S3) bucket name to create.
        topicName - The name of the Amazon Simple Notification Service (Amazon SNS) topic to create.
        eventRuleName - The Amazon EventBridge rule name to create.
    """
    val polJSON =
        "{" +
            "\"Version\": \"2012-10-17\"," +
            "\"Statement\": [{" +
            "\"Effect\": \"Allow\"," +
            "\"Principal\": {" +
            "\"Service\": \"events.amazonaws.com\"" +
            "}," +
            "\"Action\": \"sts:AssumeRole\"" +
            "}]" +
            "}"

    if (args.size != 4) {
        println(usage)
        exitProcess(1)
    }

    val sc = Scanner(System.`in`)
    val roleName = args[0]
    val bucketName = args[1]
    val topicName = args[2]
    val eventRuleName = args[3]

    println(DASHES)
    println("Welcome to the Amazon EventBridge example scenario.")
    println(DASHES)

    println(DASHES)
    println("1. Create an AWS Identity and Access Management (IAM) role to use with Amazon EventBridge.")
    val roleArn = createIAMRole(roleName, polJSON)
    println(DASHES)

    println(DASHES)
    println("2. Create an S3 bucket with EventBridge events enabled.")
    if (checkBucket(bucketName)) {
        println("$bucketName already exists. Ending this scenario.")
        exitProcess(1)
    }

    createBucket(bucketName)
    delay(3000)
    setBucketNotification(bucketName)
    println(DASHES)

    println(DASHES)
    println("3. Create a rule that triggers when an object is uploaded to Amazon S3.")
    delay(10000)
    addEventRule(roleArn, bucketName, eventRuleName)
    println(DASHES)

    println(DASHES)
    println("4. List rules on the event bus.")
    listRules()
    println(DASHES)

    println(DASHES)
    println("5. Create a new SNS topic for testing and let the user subscribe to the topic.")
    val topicArn = createSnsTopic(topicName)
    println(DASHES)

    println(DASHES)
    println("6. Add a target to the rule that sends an email to the specified topic.")
    println("Enter your email to subscribe to the Amazon SNS topic:")
    val email = sc.nextLine()
    subEmail(topicArn, email)
    println("Use the link in the email you received to confirm your subscription. Then press Enter to continue.")
    sc.nextLine()
    println(DASHES)

    println(DASHES)
    println("7. Create an EventBridge event that sends an email when an Amazon S3 object is created.")
    addSnsEventRule(eventRuleName, topicArn, topicName, eventRuleName, bucketName)
    println(DASHES)

    println(DASHES)
    println("8. List targets.")
    listTargets(eventRuleName)
    println(DASHES)

    println(DASHES)
    println(" 9. List the rules for the same target.")
    listTargetRules(topicArn)
    println(DASHES)

    println(DASHES)
    println("10. Trigger the rule by uploading a file to the S3 bucket.")
    println("Press Enter to continue.")
    sc.nextLine()
    uploadTextFiletoS3(bucketName)
    println(DASHES)

    println(DASHES)
    println("11. Disable a specific rule.")
    changeRuleState(eventRuleName, false)
    println(DASHES)

    println(DASHES)
    println("12. Check and print the state of the rule.")
    checkRule(eventRuleName)
    println(DASHES)

    println(DASHES)
    println("13. Add a transform to the rule to change the text of the email.")
    updateSnsEventRule(topicArn, eventRuleName)
    println(DASHES)

    println(DASHES)
    println("14. Enable a specific rule.")
    changeRuleState(eventRuleName, true)
    println(DASHES)

    println(DASHES)
    println("15. Trigger the updated rule by uploading a file to the S3 bucket.")
    println("Press Enter to continue.")
    sc.nextLine()
    uploadTextFiletoS3(bucketName)
    println(DASHES)

    println(DASHES)
    println("16. Update the rule to a custom rule pattern.")
    updateToCustomRule(eventRuleName)
    println("Updated event rule $eventRuleName to use a custom pattern.")
    updateCustomRuleTargetWithTransform(topicArn, eventRuleName)
    println("Updated event target $topicArn.")
    println(DASHES)

    println(DASHES)
    println("17. Send an event to trigger the rule. This will trigger a subscription email.")
    triggerCustomRule(email)
    println("Events have been sent. Press Enter to continue.")
    sc.nextLine()
    println(DASHES)

    println(DASHES)
    println("18. Clean up resources.")
    println("Do you want to clean up resources (y/n)")
    val ans = sc.nextLine()
    if (ans.compareTo("y") == 0) {
        cleanupResources(topicArn, eventRuleName, bucketName, roleName)
    } else {
        println("The resources will not be cleaned up. ")
    }
    println(DASHES)

    println(DASHES)
    println("The Amazon EventBridge example scenario has successfully completed.")
    println(DASHES)
}

suspend fun cleanupResources(
    topicArn: String?,
    eventRuleName: String?,
    bucketName: String?,
    roleName: String?,
) {
    println("Removing all targets from the event rule.")
    deleteTargetsFromRule(eventRuleName)
    deleteRuleByName(eventRuleName)
    deleteSNSTopic(topicArn)
    deleteS3Bucket(bucketName)
    deleteRole(roleName)
}

suspend fun deleteRole(roleNameVal: String?) {
    val policyArnVal = "arn:aws:iam::aws:policy/AmazonEventBridgeFullAccess"
    val policyRequest =
        DetachRolePolicyRequest {
            policyArn = policyArnVal
            roleName = roleNameVal
        }
    IamClient.fromEnvironment { region = "us-east-1" }.use { iam ->
        iam.detachRolePolicy(policyRequest)
        println("Successfully detached policy $policyArnVal from role $roleNameVal")

        // Delete the role.
        val roleRequest =
            DeleteRoleRequest {
                roleName = roleNameVal
            }

        iam.deleteRole(roleRequest)
        println("*** Successfully deleted $roleNameVal")
    }
}

suspend fun deleteS3Bucket(bucketName: String?) {
    // Remove all the objects from the S3 bucket.
    val listObjects =
        ListObjectsRequest {
            bucket = bucketName
        }
    S3Client.fromEnvironment { region = "us-east-1" }.use { s3Client ->
        val res = s3Client.listObjects(listObjects)
        val myObjects = res.contents
        val toDelete = mutableListOf<ObjectIdentifier>()

        if (myObjects != null) {
            for (myValue in myObjects) {
                toDelete.add(
                    ObjectIdentifier {
                        key = myValue.key
                    },
                )
            }
        }

        val delOb =
            Delete {
                objects = toDelete
            }

        val dor =
            DeleteObjectsRequest {
                bucket = bucketName
                delete = delOb
            }
        s3Client.deleteObjects(dor)

        // Delete the S3 bucket.
        val deleteBucketRequest =
            DeleteBucketRequest {
                bucket = bucketName
            }
        s3Client.deleteBucket(deleteBucketRequest)
        println("You have deleted the bucket and the objects")
    }
}

// Delete the SNS topic.
suspend fun deleteSNSTopic(topicArnVal: String?) {
    val request =
        DeleteTopicRequest {
            topicArn = topicArnVal
        }

    SnsClient.fromEnvironment { region = "us-east-1" }.use { snsClient ->
        snsClient.deleteTopic(request)
        println(" $topicArnVal was deleted.")
    }
}

suspend fun deleteRuleByName(ruleName: String?) {
    val ruleRequest =
        DeleteRuleRequest {
            name = ruleName
        }
    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        eventBrClient.deleteRule(ruleRequest)
        println("Successfully deleted the rule")
    }
}

suspend fun deleteTargetsFromRule(eventRuleName: String?) {
    // First, get all targets that will be deleted.
    val request =
        ListTargetsByRuleRequest {
            rule = eventRuleName
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        val response = eventBrClient.listTargetsByRule(request)
        val allTargets = response.targets

        // Get all targets and delete them.
        if (allTargets != null) {
            for (myTarget in allTargets) {
                val removeTargetsRequest =
                    RemoveTargetsRequest {
                        rule = eventRuleName
                        ids = listOf(myTarget.id.toString())
                    }
                eventBrClient.removeTargets(removeTargetsRequest)
                println("Successfully removed the target")
            }
        }
    }
}

suspend fun triggerCustomRule(email: String) {
    val json =
        "{" +
            "\"UserEmail\": \"" + email + "\"," +
            "\"Message\": \"This event was generated by example code.\"" +
            "\"UtcTime\": \"Now.\"" +
            "}"

    val entry =
        PutEventsRequestEntry {
            source = "ExampleSource"
            detail = json
            detailType = "ExampleType"
        }

    val eventsRequest =
        PutEventsRequest {
            this.entries = listOf(entry)
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        eventBrClient.putEvents(eventsRequest)
    }
}

suspend fun updateCustomRuleTargetWithTransform(
    topicArn: String?,
    ruleName: String?,
) {
    val targetId = UUID.randomUUID().toString()

    val inputTransformerOb =
        InputTransformer {
            inputTemplate = "\"Notification: sample event was received.\""
        }

    val target =
        Target {
            id = targetId
            arn = topicArn
            inputTransformer = inputTransformerOb
        }

    val targetsRequest =
        PutTargetsRequest {
            rule = ruleName
            targets = listOf(target)
            eventBusName = null
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        eventBrClient.putTargets(targetsRequest)
    }
}

suspend fun updateToCustomRule(ruleName: String?) {
    val customEventsPattern =
        "{" +
            "\"source\": [\"ExampleSource\"]," +
            "\"detail-type\": [\"ExampleType\"]" +
            "}"
    val request =
        PutRuleRequest {
            name = ruleName
            description = "Custom test rule"
            eventPattern = customEventsPattern
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        eventBrClient.putRule(request)
    }
}

// Update an Amazon S3 object created rule with a transform on the target.
suspend fun updateSnsEventRule(
    topicArn: String?,
    ruleName: String?,
) {
    val targetId = UUID.randomUUID().toString()
    val myMap = mutableMapOf<String, String>()
    myMap["bucket"] = "$.detail.bucket.name"
    myMap["time"] = "$.time"

    val inputTransOb =
        InputTransformer {
            inputTemplate = "\"Notification: an object was uploaded to bucket <bucket> at <time>.\""
            inputPathsMap = myMap
        }
    val targetOb =
        Target {
            id = targetId
            arn = topicArn
            inputTransformer = inputTransOb
        }

    val targetsRequest =
        PutTargetsRequest {
            rule = ruleName
            targets = listOf(targetOb)
            eventBusName = null
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        eventBrClient.putTargets(targetsRequest)
    }
}

suspend fun checkRule(eventRuleName: String?) {
    val ruleRequest =
        DescribeRuleRequest {
            name = eventRuleName
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        val response = eventBrClient.describeRule(ruleRequest)
        println("The state of the rule is $response")
    }
}

suspend fun changeRuleState(
    eventRuleName: String,
    isEnabled: Boolean?,
) {
    if (!isEnabled!!) {
        println("Disabling the rule: $eventRuleName")
        val ruleRequest =
            DisableRuleRequest {
                name = eventRuleName
            }
        EventBridgeClient { region = "us-east-1" }.use { eventBrClient ->
            eventBrClient.disableRule(ruleRequest)
        }
    } else {
        println("Enabling the rule: $eventRuleName")
        val ruleRequest =
            EnableRuleRequest {
                name = eventRuleName
            }
        EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
            eventBrClient.enableRule(ruleRequest)
        }
    }
}

// Create and upload a file to an S3 bucket to trigger an event.
@Throws(IOException::class)
suspend fun uploadTextFiletoS3(bucketName: String?) {
    val fileSuffix = SimpleDateFormat("yyyyMMddHHmmss").format(Date())
    val fileName = "TextFile$fileSuffix.txt"
    val myFile = File(fileName)
    val fw = FileWriter(myFile.absoluteFile)
    val bw = BufferedWriter(fw)
    bw.write("This is a sample file for testing uploads.")
    bw.close()

    val putOb =
        PutObjectRequest {
            bucket = bucketName
            key = fileName
            body = myFile.asByteStream()
        }

    S3Client.fromEnvironment { region = "us-east-1" }.use { s3Client ->
        s3Client.putObject(putOb)
    }
}

suspend fun listTargetRules(topicArnVal: String?) {
    val ruleNamesByTargetRequest =
        ListRuleNamesByTargetRequest {
            targetArn = topicArnVal
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        val response = eventBrClient.listRuleNamesByTarget(ruleNamesByTargetRequest)
        response.ruleNames?.forEach { rule ->
            println("The rule name is $rule")
        }
    }
}

suspend fun listTargets(ruleName: String?) {
    val ruleRequest =
        ListTargetsByRuleRequest {
            rule = ruleName
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        val response = eventBrClient.listTargetsByRule(ruleRequest)
        response.targets?.forEach { target ->
            println("Target ARN: ${target.arn}")
        }
    }
}

// Add a rule that triggers an SNS target when a file is uploaded to an S3 bucket.
suspend fun addSnsEventRule(
    ruleName: String?,
    topicArn: String?,
    topicName: String,
    eventRuleName: String,
    bucketName: String,
) {
    val targetID = UUID.randomUUID().toString()
    val myTarget =
        Target {
            id = targetID
            arn = topicArn
        }

    val targetsOb = mutableListOf<Target>()
    targetsOb.add(myTarget)

    val request =
        PutTargetsRequest {
            eventBusName = null
            targets = targetsOb
            rule = ruleName
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        eventBrClient.putTargets(request)
        println("Added event rule $eventRuleName with Amazon SNS target $topicName for bucket $bucketName.")
    }
}

suspend fun subEmail(
    topicArnVal: String?,
    email: String?,
) {
    val request =
        SubscribeRequest {
            protocol = "email"
            endpoint = email
            returnSubscriptionArn = true
            topicArn = topicArnVal
        }

    SnsClient.fromEnvironment { region = "us-east-1" }.use { snsClient ->
        val result = snsClient.subscribe(request)
        println(" Subscription ARN: ${result.subscriptionArn}")
    }
}

suspend fun createSnsTopic(topicName: String): String? {
    val topicPolicy = """
    {
        "Version":"2012-10-17",		 	 	 
        "Statement": [
            {
                "Sid": "EventBridgePublishTopic",
                "Effect": "Allow",
                "Principal": {
                    "Service": "events.amazonaws.com"
                },
                "Resource": "*",
                "Action": "sns:Publish"
            }
        ]
    }
    """.trimIndent()

    val topicAttributes = mutableMapOf<String, String>()
    topicAttributes["Policy"] = topicPolicy

    val topicRequest =
        CreateTopicRequest {
            name = topicName
            attributes = topicAttributes
        }

    SnsClient.fromEnvironment { region = "us-east-1" }.use { snsClient ->
        val response = snsClient.createTopic(topicRequest)
        println("Added topic $topicName for email subscriptions.")
        return response.topicArn
    }
}

suspend fun listRules() {
    val rulesRequest =
        ListRulesRequest {
            eventBusName = "default"
            limit = 10
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        val response = eventBrClient.listRules(rulesRequest)
        response.rules?.forEach { rule ->
            println("The rule name is ${rule.name}")
            println("The rule ARN is ${rule.arn}")
        }
    }
}

// Create a new event rule that triggers when an Amazon S3 object is created in a bucket.
suspend fun addEventRule(
    roleArnVal: String?,
    bucketName: String,
    eventRuleName: String?,
) {
    val pattern = """
    {
        "source": ["aws.s3"],
        "detail-type": ["Object Created"],
        "detail": {
            "bucket": {
                "name": ["$bucketName"]
            }
        }
    }
    """.trimIndent()

    val ruleRequest =
        PutRuleRequest {
            description = "Created by using the AWS SDK for Kotlin"
            name = eventRuleName
            eventPattern = pattern
            roleArn = roleArnVal
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        val ruleResponse = eventBrClient.putRule(ruleRequest)
        println("The ARN of the new rule is ${ruleResponse.ruleArn}")
    }
}

// Set the Amazon S3 bucket notification configuration.
suspend fun setBucketNotification(bucketName: String) {
    val eventBridgeConfig =
        EventBridgeConfiguration {
        }

    val configuration =
        NotificationConfiguration {
            eventBridgeConfiguration = eventBridgeConfig
        }

    val configurationRequest =
        PutBucketNotificationConfigurationRequest {
            bucket = bucketName
            notificationConfiguration = configuration
            skipDestinationValidation = true
        }

    S3Client.fromEnvironment { region = "us-east-1" }.use { s3Client ->
        s3Client.putBucketNotificationConfiguration(configurationRequest)
        println("Added bucket $bucketName with EventBridge events enabled.")
    }
}

// Create an S3 bucket using a waiter.
suspend fun createBucket(bucketName: String) {
    val request =
        CreateBucketRequest {
            bucket = bucketName
        }

    S3Client.fromEnvironment { region = "us-east-1" }.use { s3 ->
        s3.createBucket(request)
        s3.waitUntilBucketExists {
            bucket = bucketName
        }
        println("$bucketName is ready")
    }
}

suspend fun checkBucket(bucketName: String?): Boolean {
    try {
        // Determine if the S3 bucket exists.
        val headBucketRequest =
            HeadBucketRequest {
                bucket = bucketName
            }

        S3Client.fromEnvironment { region = "us-east-1" }.use { s3Client ->
            s3Client.headBucket(headBucketRequest)
            return true
        }
    } catch (e: S3Exception) {
        System.err.println(e.message)
    }
    return false
}

suspend fun createIAMRole(
    rolenameVal: String?,
    polJSON: String?,
): String? {
    val request =
        CreateRoleRequest {
            roleName = rolenameVal
            assumeRolePolicyDocument = polJSON
            description = "Created using the AWS SDK for Kotlin"
        }

    val rolePolicyRequest =
        AttachRolePolicyRequest {
            roleName = rolenameVal
            policyArn = "arn:aws:iam::aws:policy/AmazonEventBridgeFullAccess"
        }

    IamClient.fromEnvironment { region = "us-east-1" }.use { iam ->
        val response = iam.createRole(request)
        iam.attachRolePolicy(rolePolicyRequest)
        return response.role?.arn
    }
}
```
+ For API details, see the following topics in *AWS SDK for Kotlin API reference*.
  + [DeleteRule](https://sdk.amazonaws.com/kotlin/api/latest/index.html)
  + [DescribeRule](https://sdk.amazonaws.com/kotlin/api/latest/index.html)
  + [DisableRule](https://sdk.amazonaws.com/kotlin/api/latest/index.html)
  + [EnableRule](https://sdk.amazonaws.com/kotlin/api/latest/index.html)
  + [ListRuleNamesByTarget](https://sdk.amazonaws.com/kotlin/api/latest/index.html)
  + [ListRules](https://sdk.amazonaws.com/kotlin/api/latest/index.html)
  + [ListTargetsByRule](https://sdk.amazonaws.com/kotlin/api/latest/index.html)
  + [PutEvents](https://sdk.amazonaws.com/kotlin/api/latest/index.html)
  + [PutRule](https://sdk.amazonaws.com/kotlin/api/latest/index.html)
  + [PutTargets](https://sdk.amazonaws.com/kotlin/api/latest/index.html)

## Actions
<a name="actions"></a>

### `DeleteRule`
<a name="eventbridge_DeleteRule_kotlin_1_topic"></a>

The following code example shows how to use `DeleteRule`.

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/eventbridge#code-examples). 

```
suspend fun deleteRuleByName(ruleName: String?) {
    val ruleRequest =
        DeleteRuleRequest {
            name = ruleName
        }
    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        eventBrClient.deleteRule(ruleRequest)
        println("Successfully deleted the rule")
    }
}
```
+  For API details, see [DeleteRule](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*. 

### `DescribeRule`
<a name="eventbridge_DescribeRule_kotlin_1_topic"></a>

The following code example shows how to use `DescribeRule`.

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/eventbridge#code-examples). 

```
suspend fun checkRule(eventRuleName: String?) {
    val ruleRequest =
        DescribeRuleRequest {
            name = eventRuleName
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        val response = eventBrClient.describeRule(ruleRequest)
        println("The state of the rule is $response")
    }
}
```
+  For API details, see [DescribeRule](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*. 

### `DisableRule`
<a name="eventbridge_DisableRule_kotlin_1_topic"></a>

The following code example shows how to use `DisableRule`.

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/eventbridge#code-examples). 

```
suspend fun changeRuleState(
    eventRuleName: String,
    isEnabled: Boolean?,
) {
    if (!isEnabled!!) {
        println("Disabling the rule: $eventRuleName")
        val ruleRequest =
            DisableRuleRequest {
                name = eventRuleName
            }
        EventBridgeClient { region = "us-east-1" }.use { eventBrClient ->
            eventBrClient.disableRule(ruleRequest)
        }
    } else {
        println("Enabling the rule: $eventRuleName")
        val ruleRequest =
            EnableRuleRequest {
                name = eventRuleName
            }
        EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
            eventBrClient.enableRule(ruleRequest)
        }
    }
}
```
+  For API details, see [DisableRule](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*. 

### `EnableRule`
<a name="eventbridge_EnableRule_kotlin_1_topic"></a>

The following code example shows how to use `EnableRule`.

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/eventbridge#code-examples). 

```
suspend fun changeRuleState(
    eventRuleName: String,
    isEnabled: Boolean?,
) {
    if (!isEnabled!!) {
        println("Disabling the rule: $eventRuleName")
        val ruleRequest =
            DisableRuleRequest {
                name = eventRuleName
            }
        EventBridgeClient { region = "us-east-1" }.use { eventBrClient ->
            eventBrClient.disableRule(ruleRequest)
        }
    } else {
        println("Enabling the rule: $eventRuleName")
        val ruleRequest =
            EnableRuleRequest {
                name = eventRuleName
            }
        EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
            eventBrClient.enableRule(ruleRequest)
        }
    }
}
```
+  For API details, see [EnableRule](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*. 

### `ListRuleNamesByTarget`
<a name="eventbridge_ListRuleNamesByTarget_kotlin_1_topic"></a>

The following code example shows how to use `ListRuleNamesByTarget`.

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/eventbridge#code-examples). 

```
suspend fun listTargetRules(topicArnVal: String?) {
    val ruleNamesByTargetRequest =
        ListRuleNamesByTargetRequest {
            targetArn = topicArnVal
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        val response = eventBrClient.listRuleNamesByTarget(ruleNamesByTargetRequest)
        response.ruleNames?.forEach { rule ->
            println("The rule name is $rule")
        }
    }
}
```
+  For API details, see [ListRuleNamesByTarget](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*. 

### `ListRules`
<a name="eventbridge_ListRules_kotlin_1_topic"></a>

The following code example shows how to use `ListRules`.

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/eventbridge#code-examples). 

```
suspend fun listRules() {
    val rulesRequest =
        ListRulesRequest {
            eventBusName = "default"
            limit = 10
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        val response = eventBrClient.listRules(rulesRequest)
        response.rules?.forEach { rule ->
            println("The rule name is ${rule.name}")
            println("The rule ARN is ${rule.arn}")
        }
    }
}
```
+  For API details, see [ListRules](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*. 

### `ListTargetsByRule`
<a name="eventbridge_ListTargetsByRule_kotlin_1_topic"></a>

The following code example shows how to use `ListTargetsByRule`.

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/eventbridge#code-examples). 

```
suspend fun listTargets(ruleName: String?) {
    val ruleRequest =
        ListTargetsByRuleRequest {
            rule = ruleName
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        val response = eventBrClient.listTargetsByRule(ruleRequest)
        response.targets?.forEach { target ->
            println("Target ARN: ${target.arn}")
        }
    }
}
```
+  For API details, see [ListTargetsByRule](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*. 

### `PutEvents`
<a name="eventbridge_PutEvents_kotlin_1_topic"></a>

The following code example shows how to use `PutEvents`.

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/eventbridge#code-examples). 

```
suspend fun triggerCustomRule(email: String) {
    val json =
        "{" +
            "\"UserEmail\": \"" + email + "\"," +
            "\"Message\": \"This event was generated by example code.\"" +
            "\"UtcTime\": \"Now.\"" +
            "}"

    val entry =
        PutEventsRequestEntry {
            source = "ExampleSource"
            detail = json
            detailType = "ExampleType"
        }

    val eventsRequest =
        PutEventsRequest {
            this.entries = listOf(entry)
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        eventBrClient.putEvents(eventsRequest)
    }
}
```
+  For API details, see [PutEvents](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*. 

### `PutRule`
<a name="eventbridge_PutRule_kotlin_1_topic"></a>

The following code example shows how to use `PutRule`.

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/eventbridge#code-examples). 
Create a scheduled rule.  

```
suspend fun createScRule(
    ruleName: String?,
    cronExpression: String?,
) {
    val ruleRequest =
        PutRuleRequest {
            name = ruleName
            eventBusName = "default"
            scheduleExpression = cronExpression
            state = RuleState.Enabled
            description = "A test rule that runs on a schedule created by the Kotlin API"
        }

    EventBridgeClient.fromEnvironment { region = "us-west-2" }.use { eventBrClient ->
        val ruleResponse = eventBrClient.putRule(ruleRequest)
        println("The ARN of the new rule is ${ruleResponse.ruleArn}")
    }
}
```
Create a rule that triggers when an object is added to an Amazon Simple Storage Service bucket.  

```
// Create a new event rule that triggers when an Amazon S3 object is created in a bucket.
suspend fun addEventRule(
    roleArnVal: String?,
    bucketName: String,
    eventRuleName: String?,
) {
    val pattern = """
    {
        "source": ["aws.s3"],
        "detail-type": ["Object Created"],
        "detail": {
            "bucket": {
                "name": ["$bucketName"]
            }
        }
    }
    """.trimIndent()

    val ruleRequest =
        PutRuleRequest {
            description = "Created by using the AWS SDK for Kotlin"
            name = eventRuleName
            eventPattern = pattern
            roleArn = roleArnVal
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        val ruleResponse = eventBrClient.putRule(ruleRequest)
        println("The ARN of the new rule is ${ruleResponse.ruleArn}")
    }
}
```
+  For API details, see [PutRule](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*. 

### `PutTargets`
<a name="eventbridge_PutTargets_kotlin_1_topic"></a>

The following code example shows how to use `PutTargets`.

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/eventbridge#code-examples). 

```
// Add a rule that triggers an SNS target when a file is uploaded to an S3 bucket.
suspend fun addSnsEventRule(
    ruleName: String?,
    topicArn: String?,
    topicName: String,
    eventRuleName: String,
    bucketName: String,
) {
    val targetID = UUID.randomUUID().toString()
    val myTarget =
        Target {
            id = targetID
            arn = topicArn
        }

    val targetsOb = mutableListOf<Target>()
    targetsOb.add(myTarget)

    val request =
        PutTargetsRequest {
            eventBusName = null
            targets = targetsOb
            rule = ruleName
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        eventBrClient.putTargets(request)
        println("Added event rule $eventRuleName with Amazon SNS target $topicName for bucket $bucketName.")
    }
}
```
Add an input transformer to a target for a rule.  

```
suspend fun updateCustomRuleTargetWithTransform(
    topicArn: String?,
    ruleName: String?,
) {
    val targetId = UUID.randomUUID().toString()

    val inputTransformerOb =
        InputTransformer {
            inputTemplate = "\"Notification: sample event was received.\""
        }

    val target =
        Target {
            id = targetId
            arn = topicArn
            inputTransformer = inputTransformerOb
        }

    val targetsRequest =
        PutTargetsRequest {
            rule = ruleName
            targets = listOf(target)
            eventBusName = null
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        eventBrClient.putTargets(targetsRequest)
    }
}
```
+  For API details, see [PutTargets](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*. 

### `RemoveTargets`
<a name="eventbridge_RemoveTargets_kotlin_1_topic"></a>

The following code example shows how to use `RemoveTargets`.

**SDK for Kotlin**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Code Examples Repository](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/kotlin/services/eventbridge#code-examples). 

```
suspend fun deleteTargetsFromRule(eventRuleName: String?) {
    // First, get all targets that will be deleted.
    val request =
        ListTargetsByRuleRequest {
            rule = eventRuleName
        }

    EventBridgeClient.fromEnvironment { region = "us-east-1" }.use { eventBrClient ->
        val response = eventBrClient.listTargetsByRule(request)
        val allTargets = response.targets

        // Get all targets and delete them.
        if (allTargets != null) {
            for (myTarget in allTargets) {
                val removeTargetsRequest =
                    RemoveTargetsRequest {
                        rule = eventRuleName
                        ids = listOf(myTarget.id.toString())
                    }
                eventBrClient.removeTargets(removeTargetsRequest)
                println("Successfully removed the target")
            }
        }
    }
}
```
+  For API details, see [RemoveTargets](https://sdk.amazonaws.com/kotlin/api/latest/index.html) in *AWS SDK for Kotlin API reference*.