asynchronous

问题 I'm banging my head against the wall with observables. Almost all of the documentation I can find is in the older rxjs syntax. I have an API call which is an observable. I'm calling it elsewhere and subscribing to it - trying to populate a table with the data from this GET request. If I simply console.log my getData function, it logs the subscription rather than my data. I can successfully console.log data within the .subscribe function, but I want to use data outside of .subscribe() . How do

问题 I'm banging my head against the wall with observables. Almost all of the documentation I can find is in the older rxjs syntax. I have an API call which is an observable. I'm calling it elsewhere and subscribing to it - trying to populate a table with the data from this GET request. If I simply console.log my getData function, it logs the subscription rather than my data. I can successfully console.log data within the .subscribe function, but I want to use data outside of .subscribe() . How do

问题 First, I have to mention that I already look through many questions in stackoverflow, but many doesn't answer my question. Not to mention many doesn't even have an answer. How do I achieve the following, making sure functionB() executes after functionA() finishes? Note: I do not want to convert my async functions to new Promise(resolve=>{...}) because I'll have to convert the someServiceThatMakesHTTPCall() as well, and any other async functions within the call stack, which is a big change.

问题 First, I have to mention that I already look through many questions in stackoverflow, but many doesn't answer my question. Not to mention many doesn't even have an answer. How do I achieve the following, making sure functionB() executes after functionA() finishes? Note: I do not want to convert my async functions to new Promise(resolve=>{...}) because I'll have to convert the someServiceThatMakesHTTPCall() as well, and any other async functions within the call stack, which is a big change.

问题 So I've read this nice article about asynch threads in python. Tough, the last one have some troubles with the GIL and threads are not as effective as it may seems. Luckily python incorporates Multiprocessing which are designed to be not affected by this trouble. I'd like to understand how to implement a multiprocessing queue (with Pipe open for each process) in an async manner so it wouldn't hang a running async webserver . I've read this topic however I'm not looking for performance but

问题 So I've read this nice article about asynch threads in python. Tough, the last one have some troubles with the GIL and threads are not as effective as it may seems. Luckily python incorporates Multiprocessing which are designed to be not affected by this trouble. I'd like to understand how to implement a multiprocessing queue (with Pipe open for each process) in an async manner so it wouldn't hang a running async webserver . I've read this topic however I'm not looking for performance but

问题 I've begun using Boost.ASIO for some simple network programming, my understanding of the library is not a great deal, so please bear with me and my newbie question. At the moment in my project I only have 1 io_service object. Which use for all the async I/O operations etc. My understanding is that one can create multiple threads and pass the run method of an io_service instance to the thread to provide more threads to the io_service . My question: Is it good design to have multiple io_service

问题 I've begun using Boost.ASIO for some simple network programming, my understanding of the library is not a great deal, so please bear with me and my newbie question. At the moment in my project I only have 1 io_service object. Which use for all the async I/O operations etc. My understanding is that one can create multiple threads and pass the run method of an io_service instance to the thread to provide more threads to the io_service . My question: Is it good design to have multiple io_service

问题 Getting below error when i try to use async/await with NodeJs 4.x. Any issue with the below sample code or should i use alternate ? async function main () { ^^^^^^^^ SyntaxError: Unexpected token function Code Samples: (async function () { const intgetIDvalue = await fntest(getID); } })(); async function fntest (getID) { return await knex .select('column1') .from('tablename') .where('ID',getID) } 回答1: try installing asyncawait. It should work for older node versions. Other alternatives are

问题 I have the following code: public async Task<string> GetData(Uri source) { if (client.IsBusy == true) client.CancelAsync (); Task<string> tskResult = client.DownloadStringTaskAsync (source); string strResult = await tskResult; return strResult; } When I step through this method starting with Task<string>... the debugger jumps over return strResult; And the value of strResult is null. Why does this happen? Thanks. PS: I am calling this method like this: StringBuilder strBuild = new