channel

问题 I am new to go and I am trying to create a simple chat server where clients can broadcast messages to all connected clients. In my server, I have a goroutine (infinite for loop) that accepts connection and all the connections are received by a channel. go func() { for { conn, _ := listener.Accept() ch <- conn } }() Then, I start a handler (goroutine) for every connected client. Inside the handler, I try to broadcast to all connections by iterating through the channel. for c := range ch { conn

问题 In my C# (3.5) application I need to get the average color values for the red, green and blue channels of a bitmap. Preferably without using an external library. Can this be done? If so, how? Thanks in advance. Trying to make things a little more precise: Each pixel in the bitmap has a certain RGB color value. I\'d like to get the average RGB values for all pixels in the image. 回答1: The fastest way is by using unsafe code: BitmapData srcData = bm.LockBits( new Rectangle(0, 0, bm.Width, bm

问题 If I am using channels properly, should I need to use mutexes to protect against concurrent access? 回答1: You don't need mutex if you use channels correctly. In some cases a solution with mutex might be simpler though. Just make sure the variable(s) holding the channel values are properly initialized before multiple goroutines try to access the channel variables. Once this is done, accessing the channels (e.g. sending values to or receiving values from them) is safe by design. Supporting

问题 Below is a struct of type Stuff. It has three ints. A Number , its Double and its Power . Let\'s pretend that calculating the double and power of a given list of ints is an expensive computation. type Stuff struct { Number int Double int Power int } func main() { nums := []int{2, 3, 4} // given numbers stuff := []Stuff{} // struct of stuff with transformed ints double := make(chan int) power := make(chan int) for _, i := range nums { go doubleNumber(i, double) go powerNumber(i, power) } //

问题 The RabbitMQ Java client has the following concepts: Connection - a connection to a RabbitMQ server instance Channel - ??? Consumer thread pool - a pool of threads that consume messages off the RabbitMQ server queues Queue - a structure that holds messages in FIFO order I\'m trying to understand the relationship, and more importantly , the associations between them. I\'m still not quite sure what a Channel is, other than the fact that this is the structure that you publish and consume from,

问题 I need to handle emails from about 30 addresses. I implement this in a way where all emails going to one DirectChannel and after to Receiver . In Receiver I can understand from what address is message comes, to do this I create CustomMessageSource that wraps javax.mail.Message to my own type that contains javax.mail.Message and some Enum . Looks like this is not a good decision, cause I can use @Transformer , but how can I use it if I have only 1 channel? That was the first question. Second