Syntax

EventLoop-return

This JSON is the data structure returned by the EventLoop() function. The EventLoop() function monitors the following events: 1. Any WebSocket readable data events; 2. Completion events of concurrent tasks from exchange.Go() and HttpQuery_Go() functions; 3. Message events sent by threads created using the threading.Thread() function in JavaScript language strategies.

Attributes

Name	Type	Description
Seq	number	Event sequence number.
Event	string	Event name.
ThreadId	number	Event thread ID.
Index	number	Event index.
Queue	number	Number of events still waiting in the queue when this event is returned.
Nano	number	Nanosecond timestamp.

See Also

EventLoop

Remarks

When using the exchange.Go() function for concurrent requests, the event data structure returned by the EventLoop() function.


            json
            
            
{
    "Seq":1,
    "Event":"Exchange_GetTrades",
    "ThreadId":0,
    "Index":3,
    "Queue":0,
    "Nano":1682068771309583400
}

When concurrent execution threads in JavaScript language strategies (created by the threading.Thread() function) use the thread object's postMessage() function to send messages, the EventLoop() function in the receiving thread will monitor the following event data structure:


            json
            
            
{
    "Seq":4,
    "Event":"thread",
    "ThreadId":1,
    "Index":0,
    "Queue":0,
    "Nano":1727592066508674000
}

Ticker and order events pushed by the exchange (Event is tick or order, and Index is the index of the exchange object) also carry a Symbol field plus a Ticker (Ticker structure) or Order (Order structure) field.