You can’t. The rule of thumb here is that only writers should close channels, this way you know that you shouldn’t write to that channel anymore. Some simple code would look like this: for i := 0; i < 100; i++ { value := calculateSomeValue() channel <- value } close(channel) //indicate that we will no … Read more
I was looking for the same and I saw that nobody answered, so this is what I’ve found: you cannot and you won’t ever be able to. @channel: everybody in a channel, it’s a kind of contract with the user and everybody inside a channel should receive a notification. The point is that Slack has … Read more
Expanding upon Mohammed’s answer. All those URLs that you see in your conda info are your channel URLs. These are where conda will look for packages. As noted by @cel, these channels can be found in the .condarc file in your home directory. You can interact with the channels, and other data, in your .condarc … Read more
What you are doing is a fan out pattern, that is to say, multiple endpoints are listening to a single input source. The result of this pattern is, only one of these listeners will be able to get the message whenever there’s a message in the input source. The only exception is a close of … Read more
The language supports this natively and no workaround is required. It’s very simple: the quit channel should only be visible to the producer. On quit, the producer closes the channel. Only when the channel is empty and closed does the consumer quit. This is made possible by ranging over the channel. Here is an example … Read more
PUBSUB CHANNELS does this as of version 2.8.0.
Using Error Group makes this even simpler. This automatically waits for all the supplied Go Routines to complete successfully, or cancels all those remaining in the case of any one routine returning an error (in which case that error is the one bubble back up to the caller). package main import ( “context” “fmt” “math/rand” … Read more
The only non-blocking operation I know of to read from a channel is inside a select block having a default case : select { case x, ok := <-ch: if ok { fmt.Printf(“Value %d was read.\n”, x) } else { fmt.Println(“Channel closed!”) } default: fmt.Println(“No value ready, moving on.”) } Please try the non-blocking here … Read more
This famous quote can be a little bit confusing if taken too litterally. Let’s break it down to its more basic components, and define them properly: Don’t communicate by sharing memory; share memory by communicating —- 1 —- —— 2 —– —- 3 —– —– 4 —– This means that different threads of execution would … Read more
I think you have several issues with initial understanding. Frankly, I’m a bit surprised to see the following: both need 5 threads to handle the volume. How did you identify you need that exact number? Do you have any guarantees 5 threads will be enough? RabbitMQ is tuned and time tested, so it is all … Read more