channel

问题 Given the following simplified program: #[macro_use] extern crate log; extern crate ansi_term; extern crate fern; extern crate time; extern crate threadpool; extern crate id3; mod logging; use std::process::{exit, }; use ansi_term::Colour::{Yellow, Green}; use threadpool::ThreadPool; use std::sync::mpsc::channel; use std::path::{Path}; use id3::Tag; fn main() { logging::setup_logging(); let n_jobs = 2; let files = vec!( "/tmp/The Dynamics - Version Excursions/01-13- Move on Up.mp3", "/tmp/The

问题 I have one go-routine to add the objects into channel and then I have 4 go-routines to process objects of channel. The processing is nothing but adding objects to an array. But at few times, the objects are missing from final array. So I am assuming that at some point channel stops to collect objects. I have following code: package main import ( "log" "sync" ) func main() { j := 0 for { if j == 10 { break } wg := sync.WaitGroup{} months := []string{"Jan", "Feb", "Mar", "Apr", "May", "Jun",

问题 In our architecture we have a Redis server we use for caching and for publishing event. My problem is the following I have an message called "CustomerUpdate" I have 1 application listening to this message 3 instance (server) of this application are being executed for scalability 1 instance of the database is running One of the handler for this message will update the database Some other handler will erase memory cache or do something local to the instance Is there any pattern for making sure

问题 I'm rather new in golang, and trying to understand main principles and write gouroutines based code, using chanels. In others langs that i was using there were no such instruments, and i wonder getting such an errors like panic... my code: package main import "fmt" import ( "time" ) type Work struct { x,y,z int } func worker(in <-chan *Work, out chan<- *Work){ for w := range in { w.z = w.x + w.y time.Sleep(time.Duration(w.z)) out <-w } } func sendWork(in chan <- *Work){ var wo *Work wo.x, wo

问题 I tried the Go Tour exercise #71 If it is run like go run 71_hang.go ok , it works fine. However, if you use go run 71_hang.go nogood , it will run forever. The only difference is the extra fmt.Print("") in the default in the select statement. I'm not sure, but I suspect some sort of infinite loop and race-condition? And here is my solution. Note: It's not deadlock as Go didn't throw: all goroutines are asleep - deadlock! package main import ( "fmt" "os" ) type Fetcher interface { // Fetch

问题 I'm trying to connect 2 peers with webrtc and datachannel without camera and microphone. try { socket = new WebSocket("ws://localhost:1337/"); var servers = {iceServers:[{url:"stun:stun.l.google.com:19302"}]}; peerConn = new webkitRTCPeerConnection(servers, {optional:[{RtpDataChannels: true}]}); channel = peerConn.createDataChannel("abcd1234", {reliable: false}); peerConn.onicecandidate = function(evt) { if(evt.candidate) { socket.send(JSON.stringify({"candidate": evt.candidate})); } };

问题 package main import ( "encoding/json" "fmt" "/something/models" "os" "path/filepath" "runtime" ) func WriteDeviceToFile(d chan *models.Device, fileName string) { _, b, _, _ := runtime.Caller(0) basepath := filepath.Dir(b) filePath := basepath + "/dataFile/" + fileName var f *os.File var err error f, _ = os.OpenFile(filePath, os.O_APPEND|os.O_WRONLY, 0600) defer f.Close() for device := range d { deviceB, err := json.Marshal(device) fmt.Println(string(deviceB)) if err == nil { if _, err = f

问题 I am trying to use JSCH to connect to a remote server and then from that server open a telnet like session over a tcp/ip port. Say connect to server A, and once connected issue a tcp connection to server B over another port. In my webserver logs I see a GET / logged but not GET /foo as I would expect. ANything I m missing here? (I do not need to use Port forwarding since the remote port is accessible to the system I am connected to) package com.tekmor; import com.jcraft.jsch.*; import java.io

问题 I am writing a program to process millions of lines from a text file, 500k was taking 5seconds to validate the file, I wanted to speed this up. I wanted to loop over the items and process x of them async, then wait for the response to see whether I should continue. I have written some dummy code, I am not sure whether or not what I have written makes much sense, it just seems rather complicated, is there a simpler more elegant way of doing this. package main import ( "fmt" "sync" "time" )

问题 I've been searching for tutorial that relates to combine native android and dart, so far this is the best https://proandroiddev.com/communication-between-flutter-and-native-modules-9b52c6a72dd2 but it wrote in kotlin, i also try to write the code on java, but when i try to call XML file and the widget using "R" are getting error, it said "cannot resolve symbol", a lot of people said that R problem are solved by clean project or rebuild, but i'm using flutter in android studio which is feature