小编Yan*_*Liu的帖子

我正在 Erlang 开发手机游戏后端。对于每个 HTTP 请求，它可能需要查询不同的数据源，例如 PostgreSQL、MongoDB 和 Redis。我想并行地对这些数据源进行独立调用，但找不到明确的 Erlang 方法。

例如，

handle_request(?POST, <<"login">>, UserId, Token) ->
    % Verify token from PostgreSQL
    AuthResult = auth_service:login(UserId, Token), 

    % Get user data such as outfits and level from MongoDB
    UserDataResult = userdata_service:get(UserId),

    % Get messages sent to the user from Redis
    MessageResult = message_service:get(UserId),

    % How to run the above 3 calls in parallel?
    % Then wait for all their results here? 

    % Combine the result and send back to client
    build_response(AuthResult, UserDataResult, …