EventBridge esempi di utilizzo SDK per Java 2.x

I seguenti esempi di codice mostrano come eseguire azioni e implementare scenari comuni utilizzando AWS SDK for Java 2.x with EventBridge.

Le nozioni di base sono esempi di codice che mostrano come eseguire le operazioni essenziali all'interno di un servizio.

Le operazioni sono estratti di codice da programmi più grandi e devono essere eseguite nel contesto. Sebbene le operazioni mostrino come richiamare le singole funzioni del servizio, è possibile visualizzarle contestualizzate negli scenari correlati.

Gli scenari sono esempi di codice che mostrano come eseguire un'attività specifica richiamando più funzioni all'interno dello stesso servizio o combinate con altri Servizi AWS.

Ogni esempio include un collegamento al codice sorgente completo, in cui è possibile trovare istruzioni su come configurare ed eseguire il codice nel contesto.

Nozioni di base

Ciao EventBridge

L'esempio di codice seguente mostra come iniziare a utilizzare EventBridge.

SDKper Java 2.x

Nota

C'è altro su. GitHub Trova l'esempio completo e scopri di più sulla configurazione e l'esecuzione nel Repository di esempi di codice AWS.

/**
 * Before running this Java V2 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-java/latest/developer-guide/get-started.html
 *
 */
public class HelloEventBridge {
    public static void main(String[] args) {
        Region region = Region.US_WEST_2;
        EventBridgeClient eventBrClient = EventBridgeClient.builder()
                .region(region)
                .build();

        listBuses(eventBrClient);
        eventBrClient.close();
    }

    public static void listBuses(EventBridgeClient eventBrClient) {
        try {
            ListEventBusesRequest busesRequest = ListEventBusesRequest.builder()
                    .limit(10)
                    .build();

            ListEventBusesResponse response = eventBrClient.listEventBuses(busesRequest);
            List<EventBus> buses = response.eventBuses();
            for (EventBus bus : buses) {
                System.out.println("The name of the event bus is: " + bus.name());
                System.out.println("The ARN of the event bus is: " + bus.arn());
            }

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

• Per API i dettagli, vedi ListEventBuses AWS SDK for Java 2.xAPIReference.

Nozioni di base

Informazioni di base

L'esempio di codice seguente mostra come:

• Creare una regola e aggiungervi una destinazione.

• Abilitare e disabilitare regole.

• Elencare e aggiornare regole e destinazioni.

• Inviare eventi e quindi eliminare le risorse.

SDKper Java 2.x

Nota

C'è altro su. GitHub Trova l'esempio completo e scopri di più sulla configurazione e l'esecuzione nel Repository di esempi di codice AWS.

/**
 * Before running this Java V2 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-java/latest/developer-guide/get-started.html
 *
 * This Java code example performs the following tasks:
 *
 * This Java V2 example performs the following tasks with Amazon EventBridge:
 *
 * 1. Creates an AWS Identity and Access Management (IAM) role to use with
 * Amazon EventBridge.
 * 2. 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 Amazon S3 bucket.
 * 11. Disables a specific rule.
 * 12. Checks and print 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 Amazon S3 bucket.
 * 16. Updates the rule to be a custom rule pattern.
 * 17. Sending an event to trigger the rule.
 * 18. Cleans up resources.
 *
 */
public class EventbridgeMVP {
    public static final String DASHES = new String(new char[80]).replace("\0", "-");

    public static void main(String[] args) throws InterruptedException, IOException {
        final String 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.
                """;

        if (args.length != 5) {
            System.out.println(usage);
            System.exit(1);
        }

        String polJSON = "{" +
                "\"Version\": \"2012-10-17\"," +
                "\"Statement\": [{" +
                "\"Effect\": \"Allow\"," +
                "\"Principal\": {" +
                "\"Service\": \"events.amazonaws.com\"" +
                "}," +
                "\"Action\": \"sts:AssumeRole\"" +
                "}]" +
                "}";

        Scanner sc = new Scanner(System.in);
        String roleName = args[0];
        String bucketName = args[1];
        String topicName = args[2];
        String eventRuleName = args[3];

        Region region = Region.US_EAST_1;
        EventBridgeClient eventBrClient = EventBridgeClient.builder()
                .region(region)
                .build();

        S3Client s3Client = S3Client.builder()
                .region(region)
                .build();

        Region regionGl = Region.AWS_GLOBAL;
        IamClient iam = IamClient.builder()
                .region(regionGl)
                .build();

        SnsClient snsClient = SnsClient.builder()
                .region(region)
                .build();

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

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

        System.out.println(DASHES);
        System.out.println("2. Create an S3 bucket with EventBridge events enabled.");
        if (checkBucket(s3Client, bucketName)) {
            System.out.println("Bucket " + bucketName + " already exists. Ending this scenario.");
            System.exit(1);
        }

        createBucket(s3Client, bucketName);
        Thread.sleep(3000);
        setBucketNotification(s3Client, bucketName);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("3. Create a rule that triggers when an object is uploaded to Amazon S3.");
        Thread.sleep(10000);
        addEventRule(eventBrClient, roleArn, bucketName, eventRuleName);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("4. List rules on the event bus.");
        listRules(eventBrClient);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("5. Create a new SNS topic for testing and let the user subscribe to the topic.");
        String topicArn = createSnsTopic(snsClient, topicName);
        System.out.println(DASHES);

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

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

        System.out.println(DASHES);
        System.out.println(" 8. List Targets.");
        listTargets(eventBrClient, eventRuleName);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println(" 9. List the rules for the same target.");
        listTargetRules(eventBrClient, topicArn);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println(" 10. Trigger the rule by uploading a file to the S3 bucket.");
        System.out.println("Press Enter to continue.");
        sc.nextLine();
        uploadTextFiletoS3(s3Client, bucketName);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("11. Disable a specific rule.");
        changeRuleState(eventBrClient, eventRuleName, false);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("12. Check and print the state of the rule.");
        checkRule(eventBrClient, eventRuleName);
        System.out.println(DASHES);

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

        System.out.println(DASHES);
        System.out.println("14. Enable a specific rule.");
        changeRuleState(eventBrClient, eventRuleName, true);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println(" 15. Trigger the updated rule by uploading a file to the S3 bucket.");
        System.out.println("Press Enter to continue.");
        sc.nextLine();
        uploadTextFiletoS3(s3Client, bucketName);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println(" 16. Update the rule to be a custom rule pattern.");
        updateToCustomRule(eventBrClient, eventRuleName);
        System.out.println("Updated event rule " + eventRuleName + " to use a custom pattern.");
        updateCustomRuleTargetWithTransform(eventBrClient, topicArn, eventRuleName);
        System.out.println("Updated event target " + topicArn + ".");
        System.out.println(DASHES);

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

        System.out.println(DASHES);
        System.out.println("18. Clean up resources.");
        System.out.println("Do you want to clean up resources (y/n)");
        String ans = sc.nextLine();
        if (ans.compareTo("y") == 0) {
            cleanupResources(eventBrClient, snsClient, s3Client, iam, topicArn, eventRuleName, bucketName, roleName);
        } else {
            System.out.println("The resources will not be cleaned up. ");
        }
        System.out.println(DASHES);

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

    public static void cleanupResources(EventBridgeClient eventBrClient, SnsClient snsClient, S3Client s3Client,
            IamClient iam, String topicArn, String eventRuleName, String bucketName, String roleName) {
        System.out.println("Removing all targets from the event rule.");
        deleteTargetsFromRule(eventBrClient, eventRuleName);
        deleteRuleByName(eventBrClient, eventRuleName);
        deleteSNSTopic(snsClient, topicArn);
        deleteS3Bucket(s3Client, bucketName);
        deleteRole(iam, roleName);
    }

    public static void deleteRole(IamClient iam, String roleName) {
        String policyArn = "arn:aws:iam::aws:policy/AmazonEventBridgeFullAccess";
        DetachRolePolicyRequest policyRequest = DetachRolePolicyRequest.builder()
                .policyArn(policyArn)
                .roleName(roleName)
                .build();

        iam.detachRolePolicy(policyRequest);
        System.out.println("Successfully detached policy " + policyArn + " from role " + roleName);

        // Delete the role.
        DeleteRoleRequest roleRequest = DeleteRoleRequest.builder()
                .roleName(roleName)
                .build();

        iam.deleteRole(roleRequest);
        System.out.println("*** Successfully deleted " + roleName);
    }

    public static void deleteS3Bucket(S3Client s3Client, String bucketName) {
        // Remove all the objects from the S3 bucket.
        ListObjectsRequest listObjects = ListObjectsRequest.builder()
                .bucket(bucketName)
                .build();

        ListObjectsResponse res = s3Client.listObjects(listObjects);
        List<S3Object> objects = res.contents();
        ArrayList<ObjectIdentifier> toDelete = new ArrayList<>();

        for (S3Object myValue : objects) {
            toDelete.add(ObjectIdentifier.builder()
                    .key(myValue.key())
                    .build());
        }

        DeleteObjectsRequest dor = DeleteObjectsRequest.builder()
                .bucket(bucketName)
                .delete(Delete.builder()
                        .objects(toDelete).build())
                .build();

        s3Client.deleteObjects(dor);

        // Delete the S3 bucket.
        DeleteBucketRequest deleteBucketRequest = DeleteBucketRequest.builder()
                .bucket(bucketName)
                .build();

        s3Client.deleteBucket(deleteBucketRequest);
        System.out.println("You have deleted the bucket and the objects");
    }

    // Delete the SNS topic.
    public static void deleteSNSTopic(SnsClient snsClient, String topicArn) {
        try {
            DeleteTopicRequest request = DeleteTopicRequest.builder()
                    .topicArn(topicArn)
                    .build();

            DeleteTopicResponse result = snsClient.deleteTopic(request);
            System.out.println("\n\nStatus was " + result.sdkHttpResponse().statusCode());

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

    public static void deleteRuleByName(EventBridgeClient eventBrClient, String ruleName) {
        DeleteRuleRequest ruleRequest = DeleteRuleRequest.builder()
                .name(ruleName)
                .build();

        eventBrClient.deleteRule(ruleRequest);
        System.out.println("Successfully deleted the rule");
    }

    public static void deleteTargetsFromRule(EventBridgeClient eventBrClient, String eventRuleName) {
        // First, get all targets that will be deleted.
        ListTargetsByRuleRequest request = ListTargetsByRuleRequest.builder()
                .rule(eventRuleName)
                .build();

        ListTargetsByRuleResponse response = eventBrClient.listTargetsByRule(request);
        List<Target> allTargets = response.targets();

        // Get all targets and delete them.
        for (Target myTarget : allTargets) {
            RemoveTargetsRequest removeTargetsRequest = RemoveTargetsRequest.builder()
                    .rule(eventRuleName)
                    .ids(myTarget.id())
                    .build();

            eventBrClient.removeTargets(removeTargetsRequest);
            System.out.println("Successfully removed the target");
        }
    }

    public static void triggerCustomRule(EventBridgeClient eventBrClient, String email) {
        String json = "{" +
                "\"UserEmail\": \"" + email + "\"," +
                "\"Message\": \"This event was generated by example code.\"," +
                "\"UtcTime\": \"Now.\"" +
                "}";

        PutEventsRequestEntry entry = PutEventsRequestEntry.builder()
                .source("ExampleSource")
                .detail(json)
                .detailType("ExampleType")
                .build();

        PutEventsRequest eventsRequest = PutEventsRequest.builder()
                .entries(entry)
                .build();

        eventBrClient.putEvents(eventsRequest);
    }

    public static void updateCustomRuleTargetWithTransform(EventBridgeClient eventBrClient, String topicArn,
            String ruleName) {
        String targetId = java.util.UUID.randomUUID().toString();
        InputTransformer inputTransformer = InputTransformer.builder()
                .inputTemplate("\"Notification: sample event was received.\"")
                .build();

        Target target = Target.builder()
                .id(targetId)
                .arn(topicArn)
                .inputTransformer(inputTransformer)
                .build();

        try {
            PutTargetsRequest targetsRequest = PutTargetsRequest.builder()
                    .rule(ruleName)
                    .targets(target)
                    .eventBusName(null)
                    .build();

            eventBrClient.putTargets(targetsRequest);
        } catch (EventBridgeException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static void updateToCustomRule(EventBridgeClient eventBrClient, String ruleName) {
        String customEventsPattern = "{" +
                "\"source\": [\"ExampleSource\"]," +
                "\"detail-type\": [\"ExampleType\"]" +
                "}";

        PutRuleRequest request = PutRuleRequest.builder()
                .name(ruleName)
                .description("Custom test rule")
                .eventPattern(customEventsPattern)
                .build();

        eventBrClient.putRule(request);
    }

    // Update an Amazon S3 object created rule with a transform on the target.
    public static void updateSnsEventRule(EventBridgeClient eventBrClient, String topicArn, String ruleName) {
        String targetId = java.util.UUID.randomUUID().toString();
        Map<String, String> myMap = new HashMap<>();
        myMap.put("bucket", "$.detail.bucket.name");
        myMap.put("time", "$.time");

        InputTransformer inputTransformer = InputTransformer.builder()
                .inputTemplate("\"Notification: an object was uploaded to bucket <bucket> at <time>.\"")
                .inputPathsMap(myMap)
                .build();

        Target target = Target.builder()
                .id(targetId)
                .arn(topicArn)
                .inputTransformer(inputTransformer)
                .build();

        try {
            PutTargetsRequest targetsRequest = PutTargetsRequest.builder()
                    .rule(ruleName)
                    .targets(target)
                    .eventBusName(null)
                    .build();

            eventBrClient.putTargets(targetsRequest);

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

    public static void checkRule(EventBridgeClient eventBrClient, String eventRuleName) {
        try {
            DescribeRuleRequest ruleRequest = DescribeRuleRequest.builder()
                    .name(eventRuleName)
                    .build();

            DescribeRuleResponse response = eventBrClient.describeRule(ruleRequest);
            System.out.println("The state of the rule is " + response.stateAsString());

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

    public static void changeRuleState(EventBridgeClient eventBrClient, String eventRuleName, Boolean isEnabled) {
        try {
            if (!isEnabled) {
                System.out.println("Disabling the rule: " + eventRuleName);
                DisableRuleRequest ruleRequest = DisableRuleRequest.builder()
                        .name(eventRuleName)
                        .build();

                eventBrClient.disableRule(ruleRequest);
            } else {
                System.out.println("Enabling the rule: " + eventRuleName);
                EnableRuleRequest ruleRequest = EnableRuleRequest.builder()
                        .name(eventRuleName)
                        .build();
                eventBrClient.enableRule(ruleRequest);
            }

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

    // Create and upload a file to an S3 bucket to trigger an event.
    public static void uploadTextFiletoS3(S3Client s3Client, String bucketName) throws IOException {
        // Create a unique file name.
        String fileSuffix = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
        String fileName = "TextFile" + fileSuffix + ".txt";

        File myFile = new File(fileName);
        FileWriter fw = new FileWriter(myFile.getAbsoluteFile());
        BufferedWriter bw = new BufferedWriter(fw);
        bw.write("This is a sample file for testing uploads.");
        bw.close();

        try {
            PutObjectRequest putOb = PutObjectRequest.builder()
                    .bucket(bucketName)
                    .key(fileName)
                    .build();

            s3Client.putObject(putOb, RequestBody.fromFile(myFile));

        } catch (S3Exception e) {
            System.err.println(e.getMessage());
            System.exit(1);
        }
    }

    public static void listTargetRules(EventBridgeClient eventBrClient, String topicArn) {
        ListRuleNamesByTargetRequest ruleNamesByTargetRequest = ListRuleNamesByTargetRequest.builder()
                .targetArn(topicArn)
                .build();

        ListRuleNamesByTargetResponse response = eventBrClient.listRuleNamesByTarget(ruleNamesByTargetRequest);
        List<String> rules = response.ruleNames();
        for (String rule : rules) {
            System.out.println("The rule name is " + rule);
        }
    }

    public static void listTargets(EventBridgeClient eventBrClient, String ruleName) {
        ListTargetsByRuleRequest ruleRequest = ListTargetsByRuleRequest.builder()
                .rule(ruleName)
                .build();

        ListTargetsByRuleResponse res = eventBrClient.listTargetsByRule(ruleRequest);
        List<Target> targetsList = res.targets();
        for (Target target: targetsList) {
            System.out.println("Target ARN: "+target.arn());
        }
    }

    // Add a rule which triggers an SNS target when a file is uploaded to an S3
    // bucket.
    public static void addSnsEventRule(EventBridgeClient eventBrClient, String ruleName, String topicArn,
            String topicName, String eventRuleName, String bucketName) {
        String targetID = java.util.UUID.randomUUID().toString();
        Target myTarget = Target.builder()
                .id(targetID)
                .arn(topicArn)
                .build();

        List<Target> targets = new ArrayList<>();
        targets.add(myTarget);
        PutTargetsRequest request = PutTargetsRequest.builder()
                .eventBusName(null)
                .targets(targets)
                .rule(ruleName)
                .build();

        eventBrClient.putTargets(request);
        System.out.println("Added event rule " + eventRuleName + " with Amazon SNS target " + topicName + " for bucket "
                + bucketName + ".");
    }

    public static void subEmail(SnsClient snsClient, String topicArn, String email) {
        try {
            SubscribeRequest request = SubscribeRequest.builder()
                    .protocol("email")
                    .endpoint(email)
                    .returnSubscriptionArn(true)
                    .topicArn(topicArn)
                    .build();

            SubscribeResponse result = snsClient.subscribe(request);
            System.out.println("Subscription ARN: " + result.subscriptionArn() + "\n\n Status is "
                    + result.sdkHttpResponse().statusCode());

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

    public static void listRules(EventBridgeClient eventBrClient) {
        try {
            ListRulesRequest rulesRequest = ListRulesRequest.builder()
                    .eventBusName("default")
                    .limit(10)
                    .build();

            ListRulesResponse response = eventBrClient.listRules(rulesRequest);
            List<Rule> rules = response.rules();
            for (Rule rule : rules) {
                System.out.println("The rule name is : " + rule.name());
                System.out.println("The rule description is : " + rule.description());
                System.out.println("The rule state is : " + rule.stateAsString());
            }

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

    public static String createSnsTopic(SnsClient snsClient, String topicName) {
        String topicPolicy = "{" +
                "\"Version\": \"2012-10-17\"," +
                "\"Statement\": [{" +
                "\"Sid\": \"EventBridgePublishTopic\"," +
                "\"Effect\": \"Allow\"," +
                "\"Principal\": {" +
                "\"Service\": \"events.amazonaws.com\"" +
                "}," +
                "\"Resource\": \"*\"," +
                "\"Action\": \"sns:Publish\"" +
                "}]" +
                "}";

        Map<String, String> topicAttributes = new HashMap<>();
        topicAttributes.put("Policy", topicPolicy);
        CreateTopicRequest topicRequest = CreateTopicRequest.builder()
                .name(topicName)
                .attributes(topicAttributes)
                .build();

        CreateTopicResponse response = snsClient.createTopic(topicRequest);
        System.out.println("Added topic " + topicName + " for email subscriptions.");
        return response.topicArn();
    }

    // Create a new event rule that triggers when an Amazon S3 object is created in
    // a bucket.
    public static void addEventRule(EventBridgeClient eventBrClient, String roleArn, String bucketName,
            String eventRuleName) {
        String pattern = "{\n" +
                "  \"source\": [\"aws.s3\"],\n" +
                "  \"detail-type\": [\"Object Created\"],\n" +
                "  \"detail\": {\n" +
                "    \"bucket\": {\n" +
                "      \"name\": [\"" + bucketName + "\"]\n" +
                "    }\n" +
                "  }\n" +
                "}";

        try {
            PutRuleRequest ruleRequest = PutRuleRequest.builder()
                    .description("Created by using the AWS SDK for Java v2")
                    .name(eventRuleName)
                    .eventPattern(pattern)
                    .roleArn(roleArn)
                    .build();

            PutRuleResponse ruleResponse = eventBrClient.putRule(ruleRequest);
            System.out.println("The ARN of the new rule is " + ruleResponse.ruleArn());

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

    // Determine if the S3 bucket exists.
    public static Boolean checkBucket(S3Client s3Client, String bucketName) {
        try {
            HeadBucketRequest headBucketRequest = HeadBucketRequest.builder()
                    .bucket(bucketName)
                    .build();

            s3Client.headBucket(headBucketRequest);
            return true;
        } catch (S3Exception e) {
            System.err.println(e.awsErrorDetails().errorMessage());
        }
        return false;
    }

    // Set the S3 bucket notification configuration.
    public static void setBucketNotification(S3Client s3Client, String bucketName) {
        try {
            EventBridgeConfiguration eventBridgeConfiguration = EventBridgeConfiguration.builder()
                    .build();

            NotificationConfiguration configuration = NotificationConfiguration.builder()
                    .eventBridgeConfiguration(eventBridgeConfiguration)
                    .build();

            PutBucketNotificationConfigurationRequest configurationRequest = PutBucketNotificationConfigurationRequest
                    .builder()
                    .bucket(bucketName)
                    .notificationConfiguration(configuration)
                    .skipDestinationValidation(true)
                    .build();

            s3Client.putBucketNotificationConfiguration(configurationRequest);
            System.out.println("Added bucket " + bucketName + " with EventBridge events enabled.");

        } catch (S3Exception e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static void createBucket(S3Client s3Client, String bucketName) {
        try {
            S3Waiter s3Waiter = s3Client.waiter();
            CreateBucketRequest bucketRequest = CreateBucketRequest.builder()
                    .bucket(bucketName)
                    .build();

            s3Client.createBucket(bucketRequest);
            HeadBucketRequest bucketRequestWait = HeadBucketRequest.builder()
                    .bucket(bucketName)
                    .build();

            // Wait until the bucket is created and print out the response.
            WaiterResponse<HeadBucketResponse> waiterResponse = s3Waiter.waitUntilBucketExists(bucketRequestWait);
            waiterResponse.matched().response().ifPresent(System.out::println);
            System.out.println(bucketName + " is ready");

        } catch (S3Exception e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static String createIAMRole(IamClient iam, String rolename, String polJSON) {
        try {
            CreateRoleRequest request = CreateRoleRequest.builder()
                    .roleName(rolename)
                    .assumeRolePolicyDocument(polJSON)
                    .description("Created using the AWS SDK for Java")
                    .build();

            CreateRoleResponse response = iam.createRole(request);
            AttachRolePolicyRequest rolePolicyRequest = AttachRolePolicyRequest.builder()
                    .roleName(rolename)
                    .policyArn("arn:aws:iam::aws:policy/AmazonEventBridgeFullAccess")
                    .build();

            iam.attachRolePolicy(rolePolicyRequest);
            return response.role().arn();

        } catch (IamException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
        return "";
    }
}

• Per API i dettagli, consulta i seguenti argomenti in AWS SDK for Java 2.x APIRiferimento.

  • DeleteRule

  • DescribeRule

  • DisableRule

  • EnableRule

  • ListRuleNamesByTarget

  • ListRules

  • ListTargetsByRule

  • PutEvents

  • PutRule

  • PutTargets

Azioni

DeleteRule

Il seguente esempio di codice mostra come utilizzareDeleteRule.

SDKper Java 2.x

Nota

C'è altro su. GitHub Trova l'esempio completo e scopri di più sulla configurazione e l'esecuzione nel Repository di esempi di codice AWS.

    public static void deleteRuleByName(EventBridgeClient eventBrClient, String ruleName) {
        DeleteRuleRequest ruleRequest = DeleteRuleRequest.builder()
                .name(ruleName)
                .build();

        eventBrClient.deleteRule(ruleRequest);
        System.out.println("Successfully deleted the rule");
    }

• Per API i dettagli, vedi DeleteRule AWS SDK for Java 2.xAPIReference.

DescribeRule

Il seguente esempio di codice mostra come utilizzareDescribeRule.

SDKper Java 2.x

Nota

C'è altro su. GitHub Trova l'esempio completo e scopri di più sulla configurazione e l'esecuzione nel Repository di esempi di codice AWS.

    public static void checkRule(EventBridgeClient eventBrClient, String eventRuleName) {
        try {
            DescribeRuleRequest ruleRequest = DescribeRuleRequest.builder()
                    .name(eventRuleName)
                    .build();

            DescribeRuleResponse response = eventBrClient.describeRule(ruleRequest);
            System.out.println("The state of the rule is " + response.stateAsString());

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

• Per API i dettagli, vedi DescribeRule AWS SDK for Java 2.xAPIReference.

DisableRule

Il seguente esempio di codice mostra come utilizzareDisableRule.

SDKper Java 2.x

Nota

C'è altro su. GitHub Trova l'esempio completo e scopri di più sulla configurazione e l'esecuzione nel Repository di esempi di codice AWS.

Disabilita una regola utilizzando il nome della stessa.

    public static void changeRuleState(EventBridgeClient eventBrClient, String eventRuleName, Boolean isEnabled) {
        try {
            if (!isEnabled) {
                System.out.println("Disabling the rule: " + eventRuleName);
                DisableRuleRequest ruleRequest = DisableRuleRequest.builder()
                        .name(eventRuleName)
                        .build();

                eventBrClient.disableRule(ruleRequest);
            } else {
                System.out.println("Enabling the rule: " + eventRuleName);
                EnableRuleRequest ruleRequest = EnableRuleRequest.builder()
                        .name(eventRuleName)
                        .build();
                eventBrClient.enableRule(ruleRequest);
            }

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

• Per API i dettagli, vedi DisableRule AWS SDK for Java 2.xAPIReference.

EnableRule

Il seguente esempio di codice mostra come utilizzareEnableRule.

SDKper Java 2.x

Nota

C'è altro su. GitHub Trova l'esempio completo e scopri di più sulla configurazione e l'esecuzione nel Repository di esempi di codice AWS.

Abilita una regola utilizzando il nome della stessa.

    public static void changeRuleState(EventBridgeClient eventBrClient, String eventRuleName, Boolean isEnabled) {
        try {
            if (!isEnabled) {
                System.out.println("Disabling the rule: " + eventRuleName);
                DisableRuleRequest ruleRequest = DisableRuleRequest.builder()
                        .name(eventRuleName)
                        .build();

                eventBrClient.disableRule(ruleRequest);
            } else {
                System.out.println("Enabling the rule: " + eventRuleName);
                EnableRuleRequest ruleRequest = EnableRuleRequest.builder()
                        .name(eventRuleName)
                        .build();
                eventBrClient.enableRule(ruleRequest);
            }

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

• Per API i dettagli, vedi EnableRule AWS SDK for Java 2.xAPIReference.

ListRuleNamesByTarget

Il seguente esempio di codice mostra come utilizzareListRuleNamesByTarget.

SDKper Java 2.x

Nota

C'è altro su. GitHub Trova l'esempio completo e scopri di più sulla configurazione e l'esecuzione nel Repository di esempi di codice AWS.

Elenca tutti i nomi delle regole utilizzando la destinazione.

    public static void listTargetRules(EventBridgeClient eventBrClient, String topicArn) {
        ListRuleNamesByTargetRequest ruleNamesByTargetRequest = ListRuleNamesByTargetRequest.builder()
                .targetArn(topicArn)
                .build();

        ListRuleNamesByTargetResponse response = eventBrClient.listRuleNamesByTarget(ruleNamesByTargetRequest);
        List<String> rules = response.ruleNames();
        for (String rule : rules) {
            System.out.println("The rule name is " + rule);
        }
    }

• Per API i dettagli, vedi ListRuleNamesByTarget AWS SDK for Java 2.xAPIReference.

ListRules

Il seguente esempio di codice mostra come utilizzareListRules.

SDKper Java 2.x

Nota

C'è altro su. GitHub Trova l'esempio completo e scopri di più sulla configurazione e l'esecuzione nel Repository di esempi di codice AWS.

Abilita una regola utilizzando il nome della stessa.

    public static void listRules(EventBridgeClient eventBrClient) {
        try {
            ListRulesRequest rulesRequest = ListRulesRequest.builder()
                    .eventBusName("default")
                    .limit(10)
                    .build();

            ListRulesResponse response = eventBrClient.listRules(rulesRequest);
            List<Rule> rules = response.rules();
            for (Rule rule : rules) {
                System.out.println("The rule name is : " + rule.name());
                System.out.println("The rule description is : " + rule.description());
                System.out.println("The rule state is : " + rule.stateAsString());
            }

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

• Per API i dettagli, vedi ListRules AWS SDK for Java 2.xAPIReference.

ListTargetsByRule

Il seguente esempio di codice mostra come utilizzareListTargetsByRule.

SDKper Java 2.x

Nota

C'è altro su. GitHub Trova l'esempio completo e scopri di più sulla configurazione e l'esecuzione nel Repository di esempi di codice AWS.

Elenca tutte le destinazioni di una regola utilizzando il nome della stessa.

    public static void listTargets(EventBridgeClient eventBrClient, String ruleName) {
        ListTargetsByRuleRequest ruleRequest = ListTargetsByRuleRequest.builder()
                .rule(ruleName)
                .build();

        ListTargetsByRuleResponse res = eventBrClient.listTargetsByRule(ruleRequest);
        List<Target> targetsList = res.targets();
        for (Target target: targetsList) {
            System.out.println("Target ARN: "+target.arn());
        }
    }

• Per API i dettagli, vedi ListTargetsByRule AWS SDK for Java 2.xAPIReference.

PutEvents

Il seguente esempio di codice mostra come utilizzarePutEvents.

SDKper Java 2.x

Nota

C'è altro su. GitHub Trova l'esempio completo e scopri di più sulla configurazione e l'esecuzione nel Repository di esempi di codice AWS.

    public static void triggerCustomRule(EventBridgeClient eventBrClient, String email) {
        String json = "{" +
                "\"UserEmail\": \"" + email + "\"," +
                "\"Message\": \"This event was generated by example code.\"," +
                "\"UtcTime\": \"Now.\"" +
                "}";

        PutEventsRequestEntry entry = PutEventsRequestEntry.builder()
                .source("ExampleSource")
                .detail(json)
                .detailType("ExampleType")
                .build();

        PutEventsRequest eventsRequest = PutEventsRequest.builder()
                .entries(entry)
                .build();

        eventBrClient.putEvents(eventsRequest);
    }

• Per API i dettagli, vedi PutEvents AWS SDK for Java 2.xAPIReference.

PutRule

Il seguente esempio di codice mostra come utilizzarePutRule.

SDKper Java 2.x

Nota

C'è altro su. GitHub Trova l'esempio completo e scopri di più sulla configurazione e l'esecuzione nel Repository di esempi di codice AWS.

Crea una regola pianificata.

    public static void createEBRule(EventBridgeClient eventBrClient, String ruleName, String cronExpression) {
        try {
            PutRuleRequest ruleRequest = PutRuleRequest.builder()
                    .name(ruleName)
                    .eventBusName("default")
                    .scheduleExpression(cronExpression)
                    .state("ENABLED")
                    .description("A test rule that runs on a schedule created by the Java API")
                    .build();

            PutRuleResponse ruleResponse = eventBrClient.putRule(ruleRequest);
            System.out.println("The ARN of the new rule is " + ruleResponse.ruleArn());

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

Crea una regola che si attiva quando un oggetto viene aggiunto a un bucket di Amazon Simple Storage Service.

    // Create a new event rule that triggers when an Amazon S3 object is created in
    // a bucket.
    public static void addEventRule(EventBridgeClient eventBrClient, String roleArn, String bucketName,
            String eventRuleName) {
        String pattern = "{\n" +
                "  \"source\": [\"aws.s3\"],\n" +
                "  \"detail-type\": [\"Object Created\"],\n" +
                "  \"detail\": {\n" +
                "    \"bucket\": {\n" +
                "      \"name\": [\"" + bucketName + "\"]\n" +
                "    }\n" +
                "  }\n" +
                "}";

        try {
            PutRuleRequest ruleRequest = PutRuleRequest.builder()
                    .description("Created by using the AWS SDK for Java v2")
                    .name(eventRuleName)
                    .eventPattern(pattern)
                    .roleArn(roleArn)
                    .build();

            PutRuleResponse ruleResponse = eventBrClient.putRule(ruleRequest);
            System.out.println("The ARN of the new rule is " + ruleResponse.ruleArn());

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

• Per API i dettagli, vedi PutRule AWS SDK for Java 2.xAPIReference.

PutTargets

Il seguente esempio di codice mostra come utilizzarePutTargets.

SDKper Java 2.x

Nota

C'è altro su. GitHub Trova l'esempio completo e scopri di più sulla configurazione e l'esecuzione nel Repository di esempi di codice AWS.

Aggiungi un SNS argomento Amazon come obiettivo per una regola.

    // Add a rule which triggers an SNS target when a file is uploaded to an S3
    // bucket.
    public static void addSnsEventRule(EventBridgeClient eventBrClient, String ruleName, String topicArn,
            String topicName, String eventRuleName, String bucketName) {
        String targetID = java.util.UUID.randomUUID().toString();
        Target myTarget = Target.builder()
                .id(targetID)
                .arn(topicArn)
                .build();

        List<Target> targets = new ArrayList<>();
        targets.add(myTarget);
        PutTargetsRequest request = PutTargetsRequest.builder()
                .eventBusName(null)
                .targets(targets)
                .rule(ruleName)
                .build();

        eventBrClient.putTargets(request);
        System.out.println("Added event rule " + eventRuleName + " with Amazon SNS target " + topicName + " for bucket "
                + bucketName + ".");
    }

Aggiungi un trasformatore di input a una destinazione per una regola.

    public static void updateCustomRuleTargetWithTransform(EventBridgeClient eventBrClient, String topicArn,
            String ruleName) {
        String targetId = java.util.UUID.randomUUID().toString();
        InputTransformer inputTransformer = InputTransformer.builder()
                .inputTemplate("\"Notification: sample event was received.\"")
                .build();

        Target target = Target.builder()
                .id(targetId)
                .arn(topicArn)
                .inputTransformer(inputTransformer)
                .build();

        try {
            PutTargetsRequest targetsRequest = PutTargetsRequest.builder()
                    .rule(ruleName)
                    .targets(target)
                    .eventBusName(null)
                    .build();

            eventBrClient.putTargets(targetsRequest);
        } catch (EventBridgeException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

• Per API i dettagli, consulta la PutTargetssezione AWS SDK for Java 2.x APIReference.

RemoveTargets

Il seguente esempio di codice mostra come utilizzareRemoveTargets.

SDKper Java 2.x

Nota

C'è altro su. GitHub Trova l'esempio completo e scopri di più sulla configurazione e l'esecuzione nel Repository di esempi di codice AWS.

Rimuovi tutte le destinazioni di una regola utilizzando il nome della stessa.

    public static void deleteTargetsFromRule(EventBridgeClient eventBrClient, String eventRuleName) {
        // First, get all targets that will be deleted.
        ListTargetsByRuleRequest request = ListTargetsByRuleRequest.builder()
                .rule(eventRuleName)
                .build();

        ListTargetsByRuleResponse response = eventBrClient.listTargetsByRule(request);
        List<Target> allTargets = response.targets();

        // Get all targets and delete them.
        for (Target myTarget : allTargets) {
            RemoveTargetsRequest removeTargetsRequest = RemoveTargetsRequest.builder()
                    .rule(eventRuleName)
                    .ids(myTarget.id())
                    .build();

            eventBrClient.removeTargets(removeTargetsRequest);
            System.out.println("Successfully removed the target");
        }
    }

• Per API i dettagli, vedi RemoveTargets AWS SDK for Java 2.xAPIReference.

Scenari

Invia notifiche di eventi a EventBridge

Il seguente esempio di codice mostra come abilitare un bucket per inviare notifiche di eventi S3 EventBridge e indirizzare le notifiche verso un SNS argomento Amazon e una coda AmazonSQS.

SDKper Java 2.x

Nota

C'è altro su. GitHub Trova l'esempio completo e scopri di più sulla configurazione e l'esecuzione nel Repository di esempi di codice AWS.

    /** This method configures a bucket to send events to AWS EventBridge and creates a rule
     * to route the S3 object created events to a topic and a queue.
     *
     * @param bucketName Name of existing bucket
     * @param topicArn ARN of existing topic to receive S3 event notifications
     * @param queueArn ARN of existing queue to receive S3 event notifications
     *
     *  An AWS CloudFormation stack sets up the bucket, queue, topic before the method runs.
     */
    public static String setBucketNotificationToEventBridge(String bucketName, String topicArn, String queueArn) {
        try {
            // Enable bucket to emit S3 Event notifications to EventBridge.
            s3Client.putBucketNotificationConfiguration(b -> b
                    .bucket(bucketName)
                    .notificationConfiguration(b1 -> b1
                            .eventBridgeConfiguration(
                                    SdkBuilder::build)
                    ).build()).join();

            // Create an EventBridge rule to route Object Created notifications.
            PutRuleRequest putRuleRequest = PutRuleRequest.builder()
                    .name(RULE_NAME)
                    .eventPattern("""
                            {
                              "source": ["aws.s3"],
                              "detail-type": ["Object Created"],
                              "detail": {
                                "bucket": {
                                  "name": ["%s"]
                                }
                              }
                            }
                            """.formatted(bucketName))
                    .build();

            // Add the rule to the default event bus.
            PutRuleResponse putRuleResponse = eventBridgeClient.putRule(putRuleRequest)
                    .whenComplete((r, t) -> {
                        if (t != null) {
                            logger.error("Error creating event bus rule: " + t.getMessage(), t);
                            throw new RuntimeException(t.getCause().getMessage(), t);
                        }
                        logger.info("Event bus rule creation request sent successfully. ARN is: {}", r.ruleArn());
                    }).join();

            // Add the existing SNS topic and SQS queue as targets to the rule.
            eventBridgeClient.putTargets(b -> b
                    .eventBusName("default")
                    .rule(RULE_NAME)
                    .targets(List.of (
                            Target.builder()
                                    .arn(queueArn)
                                    .id("Queue")
                                    .build(),
                            Target.builder()
                                    .arn(topicArn)
                                    .id("Topic")
                                    .build())
                            )
                    ).join();
            return putRuleResponse.ruleArn();
        } catch (S3Exception e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
        return null;
    }

• Per API i dettagli, consulta i seguenti argomenti in AWS SDK for Java 2.x APIRiferimento.

  • PutBucketNotificationConfiguration

  • PutRule

  • PutTargets

Utilizzo degli eventi pianificati per richiamare una funzione Lambda

Il seguente esempio di codice mostra come creare una AWS Lambda funzione richiamata da un evento EventBridge pianificato di Amazon.

SDKper Java 2.x

Mostra come creare un evento EventBridge pianificato da Amazon che richiami una AWS Lambda funzione. Configura EventBridge per utilizzare un'espressione cron per pianificare quando viene richiamata la funzione Lambda. In questo esempio, si crea una funzione Lambda utilizzando il runtime Lambda Java. API Questo esempio richiama diversi AWS servizi per eseguire un caso d'uso specifico. Questo esempio dimostra come creare un'app che invia un messaggio di testo via mobile ai tuoi dipendenti che si congratula con loro alla data dell'anniversario di un anno.

Per il codice sorgente completo e le istruzioni su come configurarlo ed eseguirlo, guarda l'esempio completo su. GitHub

Servizi utilizzati in questo esempio

• DynamoDB

• EventBridge

• Lambda

• Amazon SNS