sequenceDiagram
    participant A as TMS API
    participant B as NATS<br>(event-director)
    participant C as EVENT<br>DIRECTOR
    participant D as NATS<br>(sub-rule-*)

    A->>B: Publish message
    B->>+C: Read message
    C->>C: handleTransaction()
    C->>-D: Publish message/s

flowchart TD
    start([Start]) --> postRequest[Accept NATS message from TMS]
    postRequest --> note1["Data expected: Pacs002 with DataCache"]
    note1 --> readCache[Read active network map from Redis Cache]
    readCache --> note2["Required Parameter: Cache key"]
    note2 --> checkMemory{Active Network map is found in memory}
    checkMemory -->|Yes| pruneMap[prune network map]
    checkMemory -->|No| readDB[Read active network map from Database]
    readDB --> checkDB{Network map is found}
    checkDB -->|Yes| saveCache[Save Active network map to cache]
    saveCache --> note3["Required Parameter: Cache key, Active Network Map in JSON format, Expiry time based on environment"]
    note3 --> pruneMap
    checkDB -->|No| logResult[Return No network map found in DB and Log the result]
    logResult --> note4["Results: rulesSentTo empty, failedToSend empty, networkMap empty, transaction req"]
    note4 --> stop1([Stop])
    pruneMap --> deduplicate[deduplicate all rules]
    deduplicate --> ruleLoop{foreach rule in the network sub-map}
    ruleLoop -->|More rules| sendData[Send Data]
    sendData --> note5["Data sent: transaction, network sub-map"]
    sendData --> ruleLoop
    ruleLoop -->|No more rules| sendResponse[send response back to Data Preparation]
    sendResponse --> note6["Response includes: Rules sent to, Rules not sent to, Transaction, Network sub-map"]
    note6 --> stop2([Stop])