@glue42/bbg-market-data/dist/es2015/connection/connection.js

A high-level API that wraps existing Glue42 Bloomberg Bridge Market Data interop methods. The API is based on the jBloomberg open source wrapper.

import { SessionState } from "./../bridge/types";
import { ConnectionStatus } from "./connection-status";
import CallbackRegistryFactory from "callback-registry";
import { CONNECTION_RETRY_PERIOD_DEFAULT } from "./../constants";
const STATUS_CHANGED_EVENT = "status-changed";
export class Connection {
    constructor(mdfBridge, connectionPeriodMsecs) {
        this.mdfBridge = mdfBridge;
        this.connectionPeriodMsecs = connectionPeriodMsecs;
        this.registry = CallbackRegistryFactory();
        this.connectionStatus = ConnectionStatus.Disconnected;
        this.subscribe();
    }
    onConnectionStatusChanged(callback) {
        if (typeof callback != "function") {
            throw new Error("callback must be a function.");
        }
        return this.registry.add(STATUS_CHANGED_EVENT, callback, [this.connectionStatus]);
    }
    setConnectionStatus(newConnectionStatus) {
        if (this.connectionStatus !== newConnectionStatus) {
            this.connectionStatus = newConnectionStatus;
            this.registry.execute(STATUS_CHANGED_EVENT, this.connectionStatus);
        }
    }
    subscribe() {
        const handleData = (sessionStatus) => {
            if (sessionStatus == null) {
                return;
            }
            const newConnectionStatus = sessionStatus.state === SessionState.Connected ? ConnectionStatus.Connected : ConnectionStatus.Disconnected;
            this.setConnectionStatus(newConnectionStatus);
        };
        const handleError = () => {
            this.setConnectionStatus(ConnectionStatus.Disconnected);
        };
        const handleClose = () => {
            this.setConnectionStatus(ConnectionStatus.Disconnected);
        };
        const retryPeriodMsecs = typeof this.connectionPeriodMsecs != "number" || this.connectionPeriodMsecs < CONNECTION_RETRY_PERIOD_DEFAULT
            ? CONNECTION_RETRY_PERIOD_DEFAULT
            : this.connectionPeriodMsecs;
        this.mdfBridge.subscribeForConnectionStatus(retryPeriodMsecs, {
            onData: handleData,
            onError: handleError,
            onClose: handleClose,
        });
    }
}