synchronous

问题 I'm working on a simple app using Node.js which needs to do the following when given a valid URL Retrieve the HTML of the remote page, save it locally. Spider the HTML (using cheerio) and record all JS and CSS file references. Make HTTP request for each JS/CSS file and save it to the server by file name. Zip up the html, css, and js files and stream the resulting file to the browser. I've got 1 and 2 working, and the first half of #3 but I'm running into issues with the synchronous nature of

问题 This question already has answers here : How do I return the response from an asynchronous call? (36 answers) Closed 6 years ago . I have a lot of problems in my code because it is not synchronous. Here is an example of problem that i have in a chrome extension. This is my function function getTranslation(a_data, callback) { var apiKey = '####' var json_object = {}; var url = '###'; var xmlhttp; var json_parsed = {}; storage.get('data', function(items) { json_object = { 'text': a_data, 'from'

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 5 years ago . I am currently using AFNetworking in one of my iPhone app. It's really a handy library to make asynchronous calls. However, I ran into situations in my application where I need to get the data from the server to move forward. So I figured this way of waiting for the response

问题 In Javascript, I'm creating a number of blobs that I want to prompt the user to save as files. At the moment, I'm doing that using URL.createObjectURL , placing the URL in a link, and simulating a click to the link. (Of course I call URL.revokeObjectURL to release the URL so the blob can be discarded after the user saves it.) I have a loop that runs through and does this for each blob I want the user to save. At least on Firefox, triggering the link is an asynchronous operation; I call click(

问题 We're making a cross domain call to the google maps geocode API. This was and is working all fine and dandy in modern browsers, but it wasn't working at all in IE8. Looks like it would fail in IE9 as well (partial CORS support). This led to including a XDomainRequest (XDR) to take care of IE8-9. Doing that worked fine in my standalone test to get data back in IE8. The problem I'm running into now is XDR only works asynchronously so my geocode function returns before my xdr.onload fires. In my

问题 I have a page layout that looks something like this | image || image || image | When you hover over one of the images, I want to make an animation to get something like this | image-hover || image || image | or | image || image-hover || mage | or | image || image || image-hover | I've used the .animate({width: width}, speed) and it works okay. But there is one thing that is bugging me, the animations is not synchronous. The result is that the right border is flickering back and forth. In the

问题 I am using the Boost ASIO library to implement a Windows UDP client which needs to be capable of high throughput. I would like to use asynchronous receive calls so that I can eventually implement a receive timeout, ie. after a certain amount of time if no datagrams have been received my application will exit. My problem is that I see 30% higher data throughput using synchronous receives vs. asynchronous receives. I have observed this issue when running the application on multiple Dell R630,

问题 I am developing a library, which provides some time consuming services. I need to have two versions of each API, one for synchronous function call and the other for asynchronous. Library user should decide which version to use, a service result might be crucial for continue of system operation (synch call). The same operation might be needed to be done in different worker thread as it result is not needed to continue (asynch call). What are the problems of this approach? Is there any better

问题 Consider: var globalvar; function viewyearmain() { db.transaction(function (tx) { tx.executeSql('SELECT * FROM BUDGET WHERE holdingtype="month"', [], function (tx, results) { var len = results.rows.length; msg = len; globalvar = msg; }, null); }); if (globalvar>0) { alert("ROWS FOUND"); } else { alert("ROWS NOT FOUND"); } } The problem is that ROWS NOT FOUND appears because the transaction has not completed by the time the if statement is reached. 回答1: An asynchronous callback is not

问题 My current code uses series of asynchronous processes that culminate in results. I need to wrap each of these in such a way that each is accessed by a synchronous method with the result as a return value. I want to use executor services to do this, so as to allow many of these to happen at the same time. I have the feeling that Future might be pertinent to my implementation, but I can't figure out a good way to make this happen. What I have now: public class DoAJob { ResultObject result;