How to use <-chan and chan<- for one directional communication?
The Go Programming Language Specification Channel types A channel provides a mechanism for concurrently executing functions to communicate by sending and receiving values of a specified element type. The value of an uninitialized channel is nil. ChannelType = ( "chan" | "chan" "<-" | "<-" "chan" ) ElementType ....
Idiomatic way to make a request-response communication using channels
There're plenty of possibilities, depends what is best approach for your problem. When you receive something from a channel, there is nothing like a default way for responding – you need to build the flow by yourself (and you definitely did in the example in your question). Sending a response...
How to access midi percussion on delphi? [closed]
Using Wikipedia, MSDN and MIDI.org, I found out how to use the percussion 'instruments'. (That is, I found out how to set the channel.) Try the following code. It is totally awesome. unit Unit5; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, MMSystem; type TForm5 = class(TForm)...
Symfony/FOSFacebook - Unable to generate a URL for the named route “fos_facebook_channel”
symfony2,channel,fosfacebookbundle
Try to add fos_facebook_channel: resource: "@FOSFacebookBundle/Resources/config/routing.xml" to your app\config\routing.yml file....
WebSphere MQ DISC vs KAINT on SVRCONN channels
websphere-mq,channel,keep-alive
First off, KAINT controls TCP functions, not MQ functions. That means for it to take effect, the TCP Keepalive function must be enabled in the qm.ini TCP stanza. Nothing wrong with this, but the native HBINT and DISCINT are more responsive than delegating to TCP. This addresses the problem that...
Pass map, slice over channel and over network?
If depends on the format you will chose for the serialization. One well-suited for over-the-network communication is MessagePack (an efficient binary serialization format. It lets you exchange data among multiple languages like JSON. But it's faster and smaller) A Go library like philhofer/msgp can serializaze any struct (like one with...
how to use gdb debug golang code to see what's inside channel?
debugging,concurrency,go,gdb,channel
You just have to dereference ch. With a very small program: package main func main() { ch := make(chan int, 10) ch <- 1 ch <- 2 ch <- 4 <-ch } Debugging: (gdb) p *ch $1 = struct hchan<int> = {1, 2, 4} ...
Lifetime for passed-in function that is then executed in a thread
multithreading,concurrency,rust,channel,lifetime
Thread::spawn requires the function that is given to it to be 'static; the closure must thus consume all things that come into it. You have gone taking a reference to self.incoming—a non-static reference. This won’t work; you must move the reader into it. The way to do this is probably...
Go Channels behaviour appears inconsistent
Roughly: Send and receive happen concurrently. The details are explained in the Go Memory Model which determines this behaviour. Concurrent code is complicated...
How to create a topic and channels in NSQ? [closed]
this way you can create a topic and channels --- var hellodd; hellodd = new nsq.Reader('part_one', 'one_channel', { lookupdHTTPAddresses: localhost:4060 });...
Use “default channel grouping” as a dimension in Google Analytics API
google-analytics,grouping,google-analytics-api,channel
Acutaly I think you should be looking at the Core Reporting Api and dimensions and metrics The thing that's going to be a little tricky is that first column. That column is Traffic Type and not something you can export directly. It is calculated based upon Source / medium. Direct...
Remove the image tag when image is not uploaded to Channel Advisor. No jQuery method please
javascript,image,tags,channel,jssor
Try ... <img src="{{THUMB(ITEMIMAGEURL1)}}" id="img1"> <img src="{{THUMB(ITEMIMAGEURL2)}}" id="img2"> <img src="{{THUMB(ITEMIMAGEURL3)}}" id="img3"> <img src="{{THUMB(ITEMIMAGEURL4)}}" id="img4"> <img src="{{THUMB(ITEMIMAGEURL5)}}" id="img5"> <img src="{{THUMB(ITEMIMAGEURL6)}}" id="img6"> <img src="{{THUMB(ITEMIMAGEURL7)}}" id="img7"> <img src="{{THUMB(ITEMIMAGEURL8)}}" id="img8"> <img src="{{THUMB(ITEMIMAGEURL9)}}" id="img9"> <img src="{{THUMB(ITEMIMAGEURL10)}}"...
What is gevent.queue.Channel?
Looking at the code for the pre-1.0 version of Gevent tells you what a Channel is (though I recognize this is a bit convoluted): Queue(0) is a channel, that is, its put method always blocks until the item is delivered. (This is unlike the standard Queue, where 0 means infinite...
Can Go routines share ownership of a channel?
concurrency,go,race-condition,channel,goroutine
Channel accesses are thread-safe, so you do not need to lock it or make local copies of it or anything like that.
golang 2 go routines if one terminates terminate the other one
You can usually do this with a shared quit channel, and some counting. func (p *Player) writeToSocket(quit <-chan struct{}) defer func() { p.closeEventChan <- true }() for { select { case <-quit: return case m := <-p.writeChan: // Do stuff // Case where writeChan is closed, but quit isn't default:...
How can I signal a channel sender to quit in golang?
Your inputData() is fine, that's the way to do it. In your use case, your channel consumer, the receiver, aka doSomethingWithInput() is the one which should have control over the "quit" channel. As it is, if an error occurs, just return from doSomethingWithInput(), which will in turn close the quit...
Which channel type uses the least amount of memory in Go?
memory,go,resources,channel,internals
Looking at the latest implementation of the channel, it's not a trivial structure: type hchan struct { qcount uint // total data in the queue dataqsiz uint // size of the circular queue buf unsafe.Pointer // points to an array of dataqsiz elements elemsize uint16 closed uint32 elemtype *_type //...
RabbitMQ channel best practice
java,tomcat,rabbitmq,channel,spring-rabbit
Since you are a Spring Framework user, consider using Spring AMQP. The RabbitTemplate uses cached channels over a single connection with the channel being checked out of the cache (and returned) for each operation. The default cache size is 1, so it generally needs to be configured for an environment...
Is there a method to figure out the audio channel layout in Linux?
In ALSA, the default device typically supports only stereo. You can try to open a device named front, surround40, surround51, or surround71, but these devices do not have automatic sample format conversion or software mixing. The best idea would be to use PulseAudio, and to ask the server for the...
How to read a 2-channel audio file in MATLAB
matlab,audio,channel,audio-processing
Luis Mendo is right. I was unable to find this information in doc wavread but if you check out doc sound it documents that x(:,1) is the left and x(:,2) is the right channel. If you are using a recent version of matlab, conciser switching to audioread In many cases...
Can data coming from different channels into select statement get ignored?
When the timer expires, it will send the current time on C. If no one is reading from C at the time, the send will block, so it will wait until the value is received. In this case, it will wait till the next iteration of the loop. Channels are...
Reliable way to ensure a Go channel does not block
There is a reflect.Select function that might do what you want: package main import ( "fmt" "reflect" "time" ) func main() { a, b, c := make(chan int), make(chan int), make(chan int) go func() { time.Sleep(2 * time.Second) a <- 1 }() go func() { time.Sleep(time.Second) b <- 2 }()...
GoLang: Closing a channel
The code, written like this, will produce a deadlock. But, the channel does not have necessarily to be closed. There are multiple ways to solve this issue. For instance, you could replace the for/select loop by: n := len(requests) for r := range ch { processResponse(r) n-- if n ==...
A go echo server using go channel, but no reply from the server
Just change your main a bit: ch := make(chan net.Conn) go handleClient(ch) for { conn, err := listen.Accept() if err != nil { fmt.Println("Error Accept: ", err.Error()) return } ch <- conn } The for loop is the server's main loop and will run forever if you do not exit...
NettyIO not correctly removing channels
java,error-handling,handler,netty,channel
You can not add the same handler again if it is not @Sharable. You will need to create a new instance
Google Analytics medium : “banner” and “Banner” (not in the same channel group)
google-analytics,channel,banner
Banner is being placed under (Other) because it is capitalized. What you can do is create a filter that will convert any campaign parameters to lowerCase. To do this: Create a new filter > select "Custom Filter" Select the Lowercase filter And from the dropdown, select Campaign Medium This will...
Junaio second quickstarts example not working
I asked the same question on the metaio forum, and a Software Engineer at metaio / junaio pointed out that my hosting provider adds additional content at the end of the response: <!-- Hosting24 Analytics Code --> <script type="text/javascript" src="http://stats.hosting24.com/count.php"></script> <!-- End Of Analytics Code --> You can see this...
Read on SocketChannel reaches end-of-stream after ServerSocketChannel performs accept
java,sockets,tcp,channel,socketchannel
Clearly the client must have closed the connection. That's the only way read() returns -1. Notes: You're throwing the inappropriate ClosedChannelException when read() returns -1. That exception is thrown by NIO when you've already closed the channel and continue to use it. It has nothing to do with end of...
Should clojure core.async channels be closed when not used anymore?
It's fine to leave them to the garbage collector unless closing them has meaning in your program. It's common to close them as a signal to other components that it's time to shut themselves down. Other channels are intended to be used forever and are never expected to be closed...
NettyIO disconnect Client from Server
java,connection,handler,netty,channel
you seem to be new to network programming in general. I am new to netty so please don't take anything I say as 100% true and especially not anywhere near 100% efficient. so one major basic fact of network programming is that the the client and server are not directly...
Make 2 cardlet Java Card communicate
applet,smartcard,channel,javacard
Yes it's possible. You need a card that supports additional logical channels.In that case, you can select more than one applet simultaneously.(One applet per each channel) Fortunately current cards support some additional logical channels. But remember that if you want to select (at least) two applets of a single package...
Please help me understand Pusher websocket API in Java
1) What happens when initiating a pusher and connecting it to a service(pusher.connect())? Is the connected pusher running in a separate thread? You can see thread management and interaction in the two following files: WebSocketConnection` Factory So, interaction with the underlying WebSocket connection take place within a designated queue...
Netty: Using a channel defined in the anymous inner class within another method
java,connection,netty,channel,anonymous-inner-class
The problem is that initChannel(...) is called for each new Channel that was accepted and so calling sendData() after the bind future completes makes no sense.
Cannot restrict the distribution of my Android app
android,google-play,publish,channel
Got my answer after contacting the Google Play Developer Support (Got their response faster than I expected). It seems that the primary e-mail of the developer account must be in the same domain as the Google Apps. A quote from the response that I got from the Google Play Developer...
Goroutine does not execute if time.Sleep included
When the main function ends, the program ends with it. It does not wait for other goroutines to finish. Quoting from the Go Language Specification: Program Execution: Program execution begins by initializing the main package and then invoking the function main. When that function invocation returns, the program exits. It...
Accessing a channel from a different goroutine
concurrency,go,channel,goroutine
Channels are two way, and are about communication, not sharing memory. So perhaps instead of sending the entire slice, just sending the last item in each slice one way down the channel and then sending the second value back the other way. func main() { ... // send only the...
golang: channel in select statement is only receiving sometimes (???)
Most likely, your main is exiting before the other goroutine finalised. Note that they're concurrent, and once main finishes, all other goroutines are killed. You need to explicitly synchronize the end of your goroutines with main. You can use sync.WaitGroup for that, or another channel....
Stuck with Go concurrency
There are a few options for how you can do this but I would say your basic problem is that your receiver doesn't do aggregation and if you changed it so it did it would not be thread safe. The simple choice to modify your receiver to do aggregation would...
Java JSch create channel to access remote server via HTTP(s)
Channel channel = session.getStreamForwarder(remoteHost, remotePort); [...] InputStream in = channel.getInputStream(); OutputStream out = channel.getOutputStream(); [...] while ((numRead = is.read(bytes)) >= 0) out.write(bytes, 0, numRead); [...] channel.disconnect(); session.disconnect(); [...] BufferedReader reader = new BufferedReader(new InputStreamReader(in)); for (String line; (line = reader.readLine()) != null;){ You are closing the channel and dropping the...
How do I use static lifetimes with threads?
You can't convert &'a T into &'static T except by leaking memory. Luckily, this is not necessary at all. There is no reason to send borrowed pointers to the thread and keep the lines on the main thread. You don't need the lines on the main thread. Just send the...
How do I get a list of uploaded videos for a certain channel?
youtube-api,channel,youtube-channels
The part parameter specifies a comma-separated list of one or more search resource properties that the API response will include. The part names that you can include in the parameter value are id and snippet. If the parameter identifies a property that contains child properties, the child properties will be...
Why all goroutines are asleep - deadlock. Identifying bottleneck
I just tried it (playground) passing a wg *sync.WaitGroup and it works. Passing sync.WaitGroup means passing a copy of the sync.WaitGroup (passing by value): the goroutine mentions Done() to a different sync.WaitGroup. var wg sync.WaitGroup for i := 0; i < 3; i++ { wg.Add(1) go worker(intInputChan, &wg) } Note...
Use of CHANNEL function instead of CDR function in asterisk 13
Try: CHANNEL(accountcode)=foo Further reading: https://wiki.asterisk.org/wiki/display/AST/Asterisk+13+Function_CHANNEL...
Golang prevent channel from blocking
As ThunderCat pointed out in his comment the solution is func (u *User) Send(msg []byte){ select{ case u.send <- msg: default: //Error handling here } } ...
Advantage of ChannelInitializer over Channel Handler in Netty
As per the documentation (see here http://netty.io/wiki/user-guide-for-4.x.html) The handler specified here will always be evaluated by a newly accepted Channel. The ChannelInitializer is a special handler that is purposed to help a user configure a new Channel. It is most likely that you want to configure the ChannelPipeline of the...
Go Channels: How to make this non-blocking?
Receivers always block until there is data to receive. If the channel is unbuffered, the sender blocks until the receiver has received the value. https://golang.org/doc/effective_go.html#channels So you can rewrite your consumer-code to something like: go func(){ for res := range chout { update5.Exec(res.data, res.id) } }() Also you need...