fix: remove ping-pong check

src/main/kotlin/com/hero/alignlab/ws/handler/ReactiveConcurrentUserWebSocketHandler.kt

@@ -15,10 +15,7 @@ import org.springframework.stereotype.Component
 import org.springframework.web.reactive.socket.WebSocketHandler
 import org.springframework.web.reactive.socket.WebSocketMessage
 import org.springframework.web.reactive.socket.WebSocketSession
-import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
-import reactor.core.publisher.SynchronousSink
-import java.time.Duration
 import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.ConcurrentMap
 
@@ -39,17 +36,6 @@ class ReactiveConcurrentUserWebSocketHandler(
      */
     private val concurrentUserByMap: ConcurrentMap<Long, ConcurrentMap<Long, WebSocketSession>> = ConcurrentHashMap()
 
-    /** ping-pong check */
-    private val eventFlux: Flux<String> = Flux.generate { sink: SynchronousSink<String> ->
-        runCatching {
-            mapper.writeValueAsString("ping pong")
-        }.onSuccess { json ->
-            sink.next(json)
-        }.onFailure { e ->
-            sink.error(e)
-        }
-    }
-
     override fun handle(session: WebSocketSession): Mono<Void> {
         val authUserToken = session.handshakeInfo.headers.resolve()
 
@@ -86,11 +72,9 @@ class ReactiveConcurrentUserWebSocketHandler(
             }
         }
 
-        return session.send(
-            Flux.interval(Duration.ofMillis(1000L))
-                .zipWith(eventFlux) { _, event -> event }
-                .map(session::textMessage)
-        ).and(session.receive().map(WebSocketMessage::getPayloadAsText).log())
+        return session.receive()
+            .map(WebSocketMessage::getPayloadAsText)
+            .log()
             .doFinally { handleSessionTermination(session, user.uid) }
             .then()
     }