time, such
   * as name, device name, version... this runtimeInfo should be used rather than calling
   * APIs on the client.
   */
  getRuntimeInfoByRemoteId(remoteId) {
    const key = this._getKeyByRemoteId(remoteId);
    return this._runtimeInfoMap.get(key);
  }

  /**
   * Retrieve a managed client for a remote id. The remote id should have been generated
   * using getRemoteId.
   */
  getConnectionTypeByRemoteId(remoteId) {
    const key = this._getKeyByRemoteId(remoteId);
    for (const type of Object.values(CONNECTION_TYPES)) {
      if (key.endsWith(type)) {
        return type;
      }
    }
    return CONNECTION_TYPES.UNKNOWN;
  }

  _getKey(id, type) {
    return id + "-" + type;
  }

  _getKeyByRemoteId(remoteId) {
    if (!remoteId) {
      // If no remote id was provided, return the key corresponding to the local
      // this-firefox runtime.
      const { THIS_FIREFOX } = CONNECTION_TYPES;
      return this._getKey(THIS_FIREFOX, THIS_FIREFOX);
    }

    return decodeURIComponent(remoteId);
  }

  _removeClientByKey(key) {
    const client = this._clients.get(key);
    if (client) {
      client.off("closed", this._onClientClosed);
      this._clients.delete(key);
      this._runtimeInfoMap.delete(key);
    }
  }

  /**
   * Cleanup all closed clients when a "closed" notification is received from a client.
   */
  _onClientClosed() {
    const closedClientKeys = [...this._clients.keys()].filter(key => {
      return this._clients.get(key)._transportClosed;
    });

    for (const key of closedClientKeys) {
      this._removeClientByKey(key);
    }
  }
}

// Expose a singleton of RemoteClientManager.
module.exports = {
  remoteClientManager: new RemoteClientManager(),
};
PK