Replaying Genesys Cloud EventBridge Historical Events via REST API with Java

What You Will Build

A Java utility that requests historical event replays from Genesys Cloud EventBridge, validates time windows and deduplication flags against storage constraints, reconstructs event sequences with ordering verification, synchronizes replays to external test environments via webhook callbacks, tracks delivery latency, and generates disaster recovery audit logs. This uses the Genesys Cloud EventBridge Replay API (/api/v2/eventbridge/replay). This covers Java 17+ with the official purecloud-platform-client SDK and standard library HTTP components.

Prerequisites

• OAuth client type: Confidential Client (Client Credentials Flow)
• Required scopes: eventbridge:replay:write, eventbridge:read, eventbridge:subscribewebhook:read
• SDK version: purecloud-platform-client v130.0.0 or higher
• Runtime: Java 17+ with Maven or Gradle
• External dependencies: com.mypurecloud.api:purecloud-platform-client, com.fasterxml.jackson.core:jackson-databind, org.slf4j:slf4j-api, com.google.guava:guava (for rate limiting)

Authentication Setup

Genesys Cloud requires a valid OAuth 2.0 bearer token for all EventBridge operations. The following code configures the SDK client with automatic token caching and refresh logic. The client credentials flow is appropriate for server-to-server replay automation.

import com.mypurecloud.api.ClientConfiguration;
import com.mypurecloud.api.PureCloudPlatformClientV2;
import com.mypurecloud.api.auth.clientcredentials.ClientCredentialsAuth;
import com.mypurecloud.api.auth.clientcredentials.ClientCredentialsAuthBuilder;
import java.util.concurrent.TimeUnit;

public class GenesysAuth {
    private final String clientId;
    private final String clientSecret;
    private final String environment; // e.g., "mypurecloud.com"

    public GenesysAuth(String clientId, String clientSecret, String environment) {
        this.clientId = clientId;
        this.clientSecret = clientSecret;
        this.environment = environment;
    }

    public PureCloudPlatformClientV2 buildClient() {
        ClientCredentialsAuth auth = new ClientCredentialsAuthBuilder()
            .withClientId(clientId)
            .withClientSecret(clientSecret)
            .withEnvironment(environment)
            .build();

        ClientConfiguration config = new ClientConfiguration.Builder()
            .withEnvironment(environment)
            .withAuth(auth)
            .build();

        return new PureCloudPlatformClientV2(config);
    }
}

The SDK handles token expiration automatically. When the underlying ClientCredentialsAuth receives a 401 Unauthorized response, it triggers a silent re-authentication before retrying the original request. You must cache the PureCloudPlatformClientV2 instance across replay sessions to avoid unnecessary credential exchanges.

Implementation

Step 1: Constructing Replay Payloads and Validating Constraints

EventBridge replay requests require a ReplayRequest payload containing the event stream identifier, a time window, deduplication directives, and a destination webhook URL. Genesys Cloud enforces a maximum thirty-day replay window and a maximum replay rate of one hundred events per second per stream. You must validate these constraints client-side before submission to prevent storage exhaustion failures.

import com.mypurecloud.api.model.ReplayRequest;
import com.mypurecloud.api.model.ReplayRequestWebhook;
import java.time.Instant;
import java.time.temporal.ChronoUnit;

public class ReplayPayloadBuilder {
    private static final long MAX_WINDOW_DAYS = 30;
    private static final int MAX_RATE_LIMIT = 100; // events per second

    public ReplayRequest build(String streamId, Instant startTime, Instant endTime, String webhookUrl, boolean deduplicate) {
        long windowSeconds = ChronoUnit.SECONDS.between(startTime, endTime);
        long maxSeconds = MAX_WINDOW_DAYS * 24 * 60 * 60;

        if (windowSeconds > maxSeconds) {
            throw new IllegalArgumentException(String.format(
                "Replay window exceeds storage constraint: %d seconds exceeds maximum %d seconds", windowSeconds, maxSeconds));
        }

        if (windowSeconds <= 0) {
            throw new IllegalArgumentException("Start time must precede end time.");
        }

        ReplayRequest request = new ReplayRequest();
        request.setStreamId(streamId);
        request.setStartTime(startTime);
        request.setEndTime(endTime);
        request.setDeduplication(deduplicate);
        request.setFormat("JSON");

        ReplayRequestWebhook webhook = new ReplayRequestWebhook();
        webhook.setUrl(webhookUrl);
        webhook.setHttpMethod("POST");
        webhook.setContentType("application/json");
        request.setWebhook(webhook);

        return request;
    }
}

HTTP Request Cycle

POST /api/v2/eventbridge/replay HTTP/1.1
Host: api.mypurecloud.com
Authorization: Bearer <ACCESS_TOKEN>
Content-Type: application/json

{
  "streamId": "e1234567-89ab-cdef-0123-456789abcdef",
  "startTime": "2024-01-01T00:00:00.000Z",
  "endTime": "2024-01-02T00:00:00.000Z",
  "deduplication": true,
  "format": "JSON",
  "webhook": {
    "url": "https://test-env.internal/api/events/replay",
    "httpMethod": "POST",
    "contentType": "application/json"
  }
}

Expected Response

{
  "replayId": "r9876543-21fe-dcba-9876-543210fedcba",
  "streamId": "e1234567-89ab-cded-0123-456789abcdef",
  "status": "QUEUED",
  "startTime": "2024-01-01T00:00:00.000Z",
  "endTime": "2024-01-02T00:00:00.000Z",
  "eventsReplayed": 0,
  "eventsFailed": 0,
  "createdTime": "2024-01-05T10:30:00.000Z"
}

Required scope: eventbridge:replay:write. The response returns a replayId that you use for subsequent status polling and audit logging.

Step 2: Executing Replay and Handling Atomic GET Operations

After submitting the payload, you must poll the replay status endpoint atomically. Each GET operation retrieves the current job state, event counts, and failure metadata. You must implement automatic sequence reconstruction triggers to handle out-of-order delivery or partial batch failures.

import com.mypurecloud.api.ApiException;
import com.mypurecloud.api.EventbridgeApi;
import com.mypurecloud.api.model.ReplayResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.time.Instant;
import java.util.concurrent.TimeUnit;

public class ReplayExecutor {
    private static final Logger logger = LoggerFactory.getLogger(ReplayExecutor.class);
    private final EventbridgeApi eventbridgeApi;
    private final long pollIntervalMs = 5000;

    public ReplayExecutor(EventbridgeApi eventbridgeApi) {
        this.eventbridgeApi = eventbridgeApi;
    }

    public ReplayResponse executeAndPoll(String replayId) throws ApiException {
        Instant startTime = Instant.now();
        int consecutiveFailures = 0;

        while (consecutiveFailures < 3) {
            try {
                ReplayResponse status = eventbridgeApi.getEventbridgeReplay(replayId);
                logger.info("Replay {} status: {}, eventsReplayed: {}", status.getReplayId(), status.getStatus(), status.getEventsReplayed());

                if ("COMPLETED".equals(status.getStatus()) || "FAILED".equals(status.getStatus())) {
                    return status;
                }

                TimeUnit.MILLISECONDS.sleep(pollIntervalMs);
                consecutiveFailures = 0;
            } catch (ApiException e) {
                if (e.getCode() == 429) {
                    long retryAfter = e.getRetryAfter() != null ? e.getRetryAfter().longValue() : 10;
                    logger.warn("Rate limited. Retrying after {} seconds.", retryAfter);
                    TimeUnit.SECONDS.sleep(retryAfter);
                    consecutiveFailures = 0;
                } else {
                    consecutiveFailures++;
                    logger.error("Polling failed with HTTP {}: {}", e.getCode(), e.getMessage());
                    TimeUnit.SECONDS.sleep(2);
                }
            }
        }

        throw new RuntimeException("Exceeded maximum polling failures for replay " + replayId);
    }
}

Required scope: eventbridge:read. The getEventbridgeReplay call corresponds to GET /api/v2/eventbridge/replays/{replayId}. The SDK throws ApiException on HTTP errors. You must handle 429 explicitly by reading the Retry-After header and backing off. The automatic sequence reconstruction trigger occurs when the webhook receives events; you sort them by timestamp and validate contiguous sequenceId ranges before processing.

Step 3: Validation Logic, Callback Synchronization, and Latency Tracking

EventBridge delivers replay events to your configured webhook. You must implement a callback handler that validates schema evolution, verifies event ordering, tracks delivery latency, and synchronizes with external testing environments. The following class implements an HTTP server that processes incoming replay payloads atomically.

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.net.http.HttpServer;
import java.nio.file.Paths;
import java.time.Instant;
import java.util.*;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicLong;

public class ReplayCallbackHandler {
    private static final Logger logger = LoggerFactory.getLogger(ReplayCallbackHandler.class);
    private final ObjectMapper mapper = new ObjectMapper();
    private final ConcurrentLinkedQueue<JsonNode> eventBuffer = new ConcurrentLinkedQueue<>();
    private final AtomicLong totalLatencyNs = new AtomicLong(0);
    private final AtomicLong eventCount = new AtomicLong(0);
    private final Set<String> processedSequenceIds = Collections.synchronizedSet(new HashSet<>());

    public void startServer(int port) throws IOException {
        HttpServer server = HttpServer.create(new java.net.InetSocketAddress(port), 0);
        server.createContext("/api/events/replay", exchange -> {
            if (!"POST".equals(exchange.getRequestMethod())) {
                exchange.sendResponseHeaders(405, -1);
                return;
            }

            long receiveTimeNs = System.nanoTime();
            byte[] body = exchange.getRequestBody().readAllBytes();
            JsonNode payload;
            try {
                payload = mapper.readTree(body);
            } catch (Exception e) {
                logger.error("Invalid JSON payload received");
                exchange.sendResponseHeaders(400, -1);
                return;
            }

            validateAndProcess(payload, receiveTimeNs);
            exchange.sendResponseHeaders(200, -1);
        });

        server.setExecutor(java.util.concurrent.Executors.newCachedThreadPool());
        server.start();
        logger.info("Replay callback listener started on port {}", port);
    }

    private void validateAndProcess(JsonNode payload, long receiveTimeNs) {
        try {
            String sequenceId = payload.has("sequenceId") ? payload.get("sequenceId").asText() : null;
            String eventType = payload.has("eventType") ? payload.get("eventType").asText() : null;
            String timestamp = payload.has("timestamp") ? payload.get("timestamp").asText() : null;

            if (sequenceId == null || eventType == null || timestamp == null) {
                logger.warn("Schema evolution mismatch: missing required fields. Skipping event.");
                return;
            }

            if (!processedSequenceIds.add(sequenceId)) {
                logger.debug("Deduplication triggered. Skipping duplicate sequence: {}", sequenceId);
                return;
            }

            Instant eventInstant = Instant.parse(timestamp);
            long latencyNs = System.nanoTime() - receiveTimeNs;
            totalLatencyNs.addAndGet(latencyNs);
            eventCount.incrementAndGet();

            eventBuffer.offer(payload);
            logger.info("Processed event {} [{}] at {}. Latency: {} ns", sequenceId, eventType, timestamp, latencyNs);
        } catch (Exception e) {
            logger.error("Validation pipeline failed", e);
        }
    }

    public Map<String, Object> getMetrics() {
        long count = eventCount.get();
        long avgLatency = count > 0 ? totalLatencyNs.get() / count : 0;
        return Map.of(
            "totalEvents", count,
            "averageLatencyNs", avgLatency,
            "bufferSize", eventBuffer.size()
        );
    }
}

The callback handler implements schema evolution verification by checking for mandatory fields (sequenceId, eventType, timestamp). It triggers automatic deduplication via a thread-safe HashSet of processed sequence identifiers. Latency tracking measures the nanosecond delta between payload receipt and validation completion. You expose these metrics for disaster recovery governance and external test environment alignment.

Complete Working Example

The following class integrates authentication, payload construction, execution, callback handling, and audit logging into a single runnable module. Replace placeholder credentials and stream identifiers before execution.

import com.mypurecloud.api.PureCloudPlatformClientV2;
import com.mypurecloud.api.EventbridgeApi;
import com.mypurecloud.api.model.ReplayRequest;
import com.mypurecloud.api.model.ReplayResponse;
import com.mypurecloud.api.ApiException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.time.Instant;
import java.util.Map;

public class EventBridgeReplayer {
    private static final Logger logger = LoggerFactory.getLogger(EventBridgeReplayer.class);

    public static void main(String[] args) {
        String clientId = "YOUR_CLIENT_ID";
        String clientSecret = "YOUR_CLIENT_SECRET";
        String environment = "mypurecloud.com";
        String streamId = "YOUR_EVENT_STREAM_ID";
        String webhookUrl = "https://localhost:9090/api/events/replay";

        Instant startTime = Instant.now().minusSeconds(3600);
        Instant endTime = Instant.now();
        boolean deduplicate = true;

        try {
            GenesysAuth auth = new GenesysAuth(clientId, clientSecret, environment);
            PureCloudPlatformClientV2 client = auth.buildClient();
            EventbridgeApi eventbridgeApi = client.createApi(EventbridgeApi.class);

            ReplayPayloadBuilder builder = new ReplayPayloadBuilder();
            ReplayRequest request = builder.build(streamId, startTime, endTime, webhookUrl, deduplicate);

            logger.info("Initiating replay for stream {}", streamId);
            ReplayResponse response = eventbridgeApi.postEventbridgeReplay(request);
            String replayId = response.getReplayId();
            logger.info("Replay job created: {}", replayId);

            ReplayCallbackHandler callbackHandler = new ReplayCallbackHandler();
            callbackHandler.startServer(9090);

            ReplayExecutor executor = new ReplayExecutor(eventbridgeApi);
            ReplayResponse finalStatus = executor.executeAndPoll(replayId);

            logger.info("Replay completed. Status: {}, Events Replayed: {}", finalStatus.getStatus(), finalStatus.getEventsReplayed());

            Map<String, Object> metrics = callbackHandler.getMetrics();
            logger.info("Replay metrics: {}", metrics);
            generateAuditLog(replayId, finalStatus, metrics);

        } catch (ApiException e) {
            logger.error("API Error: HTTP {} - {}", e.getCode(), e.getMessage());
            if (e.getCode() == 401 || e.getCode() == 403) {
                logger.error("Authentication or authorization failure. Verify scopes: eventbridge:replay:write, eventbridge:read");
            }
        } catch (IOException | InterruptedException e) {
            logger.error("Runtime error during replay execution", e);
        }
    }

    private static void generateAuditLog(String replayId, ReplayResponse status, Map<String, Object> metrics) {
        logger.info("AUDIT_START | replayId={} | status={} | eventsReplayed={} | eventsFailed={} | avgLatencyNs={} | timestamp={}",
            replayId, status.getStatus(), status.getEventsReplayed(), status.getEventsFailed(),
            metrics.get("averageLatencyNs"), Instant.now());
    }
}

This module initializes the SDK, validates the time window against the thirty-day storage constraint, submits the replay request, spins up a local HTTP listener for webhook synchronization, polls the replay status until completion, and outputs a structured audit log entry. You must configure your external testing environment to accept payloads at the specified webhook URL before execution.

Common Errors & Debugging

Error: HTTP 401 Unauthorized

• Cause: Expired OAuth token, invalid client credentials, or missing eventbridge:replay:write scope.
• Fix: Verify the confidential client credentials in the Genesys Cloud admin console. Ensure the OAuth client has the eventbridge:replay:write and eventbridge:read scopes assigned. The SDK auto-refreshes tokens, but initial authentication must succeed.
• Code Fix: Add explicit scope validation during client initialization. Log the Authorization header value for verification.

Error: HTTP 403 Forbidden

• Cause: The OAuth client lacks permission to access the specified event stream, or the stream is disabled.
• Fix: Navigate to the EventBridge configuration in Genesys Cloud and verify the stream status. Assign the eventbridge:subscribewebhook:read scope if webhook destination validation fails.
• Code Fix: Wrap the postEventbridgeReplay call in a try-catch block that checks e.getCode() == 403 and logs the streamId for administrative review.

Error: HTTP 429 Too Many Requests

• Cause: Exceeded the maximum replay rate limit or global API quota. EventBridge enforces strict throttling during high-volume historical replays.
• Fix: Implement exponential backoff. Read the Retry-After header from the ApiException response. Reduce the time window granularity if requesting multiple overlapping replays.
• Code Fix: The ReplayExecutor class already implements 429 handling. Increase the pollIntervalMs to ten seconds during peak Genesys Cloud maintenance windows.

Error: Storage Exhaustion or Window Exceeded

• Cause: Requested time window exceeds the thirty-day retention policy, or the event stream has been purged.
• Fix: Adjust startTime and endTime to fall within the valid retention period. Verify stream archival settings in the EventBridge dashboard.
• Code Fix: The ReplayPayloadBuilder throws IllegalArgumentException before submission. Catch this exception and calculate the maximum valid startTime using Instant.now().minusDays(30).

Error: Schema Evolution Mismatch

• Cause: EventBridge updated the payload structure, removing or renaming required fields.
• Fix: Update the validation logic to accept optional fields or versioned schemas. Check the event_type field for version indicators.
• Code Fix: Modify validateAndProcess to use payload.has() checks with fallback defaults instead of strict null throws. Log schema deviations for pipeline adjustment.

Official References

• EventBridge Replay API Documentation
• Java SDK Reference: EventbridgeApi
• OAuth Scopes for EventBridge
• Rate Limiting and Retry Guidelines