sequenceDiagram
    participant Requester1
    participant Requester2
    participant ChatwootService
    participant Cache

    Requester1->>ChatwootService: createConversation(remoteJid)
    ChatwootService->>Cache: has(convCacheKey_remoteJid)  // Check if conversation already cached
    Cache-->>ChatwootService: false
    ChatwootService->>Cache: has(lockKey_remoteJid)     // Check if operation is locked
    Cache-->>ChatwootService: false
    ChatwootService->>Cache: set(lockKey_remoteJid, true) // Requester1 acquires lock
    Note over ChatwootService, Cache: Lock acquired by Requester1

    Requester2->>ChatwootService: createConversation(remoteJid) // Concurrent request for same remoteJid
    ChatwootService->>Cache: has(convCacheKey_remoteJid)
    Cache-->>ChatwootService: false
    ChatwootService->>Cache: has(lockKey_remoteJid)
    Cache-->>ChatwootService: true // Lock is active, held by Requester1
    Note over ChatwootService: Requester2 starts waiting/polling period

    activate ChatwootService
    Note left of ChatwootService: Requester1 processing
    ChatwootService->>ChatwootService: Perform actual conversation creation/retrieval
    ChatwootService->>Cache: set(convCacheKey_remoteJid, conversationId) // Cache the created conversationId
    ChatwootService->>Cache: delete(lockKey_remoteJid) // Requester1 releases lock
    ChatwootService-->>Requester1: conversationId
    deactivate ChatwootService
    Note over ChatwootService, Cache: Lock released by Requester1, conversationId cached

    activate ChatwootService
    Note left of ChatwootService: Requester2's polling finds change
    ChatwootService->>Cache: has(convCacheKey_remoteJid) // Requester2 checks cache during its wait
    Cache-->>ChatwootService: true // ConversationId found in cache
    ChatwootService->>Cache: get(convCacheKey_remoteJid)
    Cache-->>ChatwootService: conversationId
    ChatwootService-->>Requester2: conversationId (from cache)
    deactivate ChatwootService

classDiagram
  class ChatwootService {
    -cache: CacheProvider
    -logger: LoggerProvider
    +createConversation(instance: InstanceDto, body: any): Promise<number | null>
  }
  note for ChatwootService "The createConversation method is updated to include caching and a locking mechanism to prevent duplicate conversation creations. It utilizes the 'cache' member for these operations."