synchronous

问题 Is there a way to receive multiple message using a single synchronous call ? When I know that there are N messages( N could be a small value less than 10) in the queue, then I should be able to do something like channel.basic_get(String queue, boolean autoAck , int numberofMsg ). I don't want to make multiple requests to the server . 回答1: RabbitMQ's basic.get doesn't support multiple messages unfortunately as seen in the docs. The preferred method to retrieve multiple messages is to use basic

问题 I would like to call f2 after f1 has been completed. f1 function can be synchronous or asynchronous . I need an example that work in both cases. I have found a solution, using a Promise and a timer: global() { this.f1().then(res => { this.f2() }) } f1() { return new Promise<any>((resolve, reject) => { // Some code... setTimeout( () => { resolve(x); }, 1500); }); } f2() { // Some code... } The problem is the program always have to wait 1500ms . I don't want f2 start before f1 is finished. Is

问题 I'm porting a pile of C++ code to Javascript using the Emscripten system. The C++ code has many calls to fopen which is a synchronous IO call. Within Emscripten, we simulate this using an XHR request to a local resource however , within Firefox synchronous XHR calls (with a responseType of blob or arraybuffer ) are only supported within a Web-Worker. Converting all that c++ code to adapt to asynchronous IO code seems very complicated so for my first try, I'd like to see if I can fake a

问题 I am looking to wrap synchronous methods into asynchronous code in order to expose those methods as asynchronous - the reason is I do not want to duplicate the code inside the synchrnous methods as I would like it to be DRY and already knowing the functionality of the syunchronous code works - no need to manage separate method as well. However I would like asynchronous methods. I understand the purpose of asynchronous methods at least what they do and why I would want to use them. Consider

问题 Is it possible the communication between USART2 and SPI1 in stm32f10x??? I asked because USART2 clock works with APB1 and SPI1 clock works with APB2. and in practice i could have communication between USART1 and SPI1 but couldnt with USART2. 回答1: Well irrespective of clock , you can communicate with individual peripherals. APB1 and APB2 are just clock sources and it should not impact the communication. 来源： https://stackoverflow.com/questions/24778183/communication-between-usart-and-spi

问题 I have a couple of jQuery Ajax requests, which have to be synchronous, but they keep locking/freezing the browser, until the response is received. My main problem is, that until the response is received I have to display a spinning icon, but due to the freezing the spinner is not displayed and even if it miraculously is it doesn't animate. This is the event displaying the spinner and sending the request: $(document).on('click', '#open-button', function () { var input = "some text"; var

问题 I have an array of promises that I would like to call in parallel, but resolve synchronously. I made this bit of code to do the required task, however, I needed to create my own object QueryablePromise to wrap the native Promise that I can synchronously check to see it's resolved status. Is there any better way to achieve this task that doesn't require a special object? Please note. I do not want to use Promise.all as I don't want to have to wait for all promises to resolve before processing

问题 I am facing a problem with Node.js (v0.12.7). I am writing an application that must be stopped somewhere and wait for a result from a query to database and then what it is doing. And the problem is not as trivial as using async (series, etc ...). I have multiple functions and modules calling each others. I tried using async but it didn't solve my problem. Concretely speaking, I have a scheme similar to this : db = require('db-utils'); exports.myFunction() { // some code ... while(condition) {

问题 I am trying to load the loggedInUser from the Local Room Database, when the App starts. I would like to skip prompting user to log-in if the saved Authentication Token of the previously saved user is still valid! So, from the DAO , I want to return a LiveData object containing the previously logged-in user , then observe it for subsequent changes. The challenge I have is that the method to get the currently logged-in user always returns null if I wrap the result inside a LiveData , but it

问题 Very Sorry for my english,i have a problem. $("#MainPicture").attr("src", url); CenterImg(); needs to be execute line 2 code after line 1 code finished . it is asynchronous and i want the code excute by synchronous . Thanks All. Question Details; i want to move $("#MainPicture") in the center screen when picture loaded.like this. $("#MainPicture").attr("src", url); // new picture width,not old picture width var PictureWidth=$("#MainPicture").width(); var ScreenWidth=$(window).width(); var