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Sends a heartbeat (ping) to all connected clients to keep connection… #353

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Sends a heartbeat (ping) to all connected clients to keep connection… #353

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22 changes: 22 additions & 0 deletions ...main/java/io/modelcontextprotocol/server/transport/WebFluxSseServerTransportProvider.java
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Original file line number Diff line number Diff line change
Expand Up @@ -229,6 +229,28 @@ public Mono<Void> closeGracefully() {
.then();
}

/**
* Sends a heartbeat (ping) to all connected clients to keep connections alive. This
* method sends ping notifications to all active sessions without expecting a
* response, which helps prevent connection timeouts.
* @return A Mono that completes when heartbeat has been sent to all sessions
*/
public Mono<Void> sendHeartbeat() {
if (sessions.isEmpty()) {
logger.debug("No active sessions to send heartbeat to");
return Mono.empty();
}

logger.debug("Sending heartbeat to {} active sessions", sessions.size());

return Flux.fromIterable(sessions.values())
.flatMap(session -> session.sendNotification(McpSchema.METHOD_PING, null)
.doOnSuccess(v -> logger.trace("Heartbeat sent successfully to session {}", session.getId()))
.doOnError(e -> logger.warn("Heartbeat failed for session {}: {}", session.getId(), e.getMessage()))
.onErrorComplete()) // Continue with other sessions even if one fails
.then();
}

/**
* Returns the WebFlux router function that defines the transport's HTTP endpoints.
* This router function should be integrated into the application's web configuration.
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