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docs/olddocs/concurrency.md
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441
docs/olddocs/concurrency.md
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# Concurrency
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Package concurrency contain some functions to support concurrent programming. eg, goroutine, channel.
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<div STYLE="page-break-after: always;"></div>
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## Source:
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- [https://github.com/duke-git/lancet/blob/main/concurrency/channel.go](https://github.com/duke-git/lancet/blob/main/concurrency/channel.go)
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<div STYLE="page-break-after: always;"></div>
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## Usage:
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```go
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import (
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"github.com/duke-git/lancet/v2/concurrency"
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)
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```
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<div STYLE="page-break-after: always;"></div>
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## Index
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### Channel
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- [NewChannel](#NewChannel)
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- [Bridge](#Bridge)
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- [FanIn](#FanIn)
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- [Generate](#Generate)
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- [Or](#Or)
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- [OrDone](#OrDone)
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- [Repeat](#Repeat)
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- [RepeatFn](#RepeatFn)
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- [Take](#Take)
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- [Tee](#Tee)
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<div STYLE="page-break-after: always;"></div>
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## Documentation
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## Channel
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### <span id="NewChannel">NewChannel</span>
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<p>Create a Channel pointer instance.</p>
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<b>Signature:</b>
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```go
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type Channel[T any] struct
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func NewChannel[T any]() *Channel[T]
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```
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<b>Example:</b>
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```go
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package main
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import (
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"fmt"
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"github.com/duke-git/lancet/v2/concurrency"
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)
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func main() {
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c := concurrency.NewChannel[int]()
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}
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```
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### <span id="Bridge">Bridge</span>
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<p>Link multiple channels into one channel until cancel the context.</p>
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<b>Signature:</b>
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```go
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func (c *Channel[T]) Bridge(ctx context.Context, chanStream <-chan <-chan T) <-chan T
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```
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<b>Example:</b>
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```go
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package main
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import (
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"context"
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"fmt"
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"github.com/duke-git/lancet/v2/concurrency"
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)
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func main() {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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c := concurrency.NewChannel[int]()
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genVals := func() <-chan <-chan int {
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out := make(chan (<-chan int))
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go func() {
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defer close(out)
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for i := 1; i <= 5; i++ {
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stream := make(chan int, 1)
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stream <- i
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close(stream)
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out <- stream
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}
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}()
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return out
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}
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for v := range c.Bridge(ctx, genVals()) {
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fmt.Println(v)
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}
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// Output:
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// 1
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// 2
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// 3
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// 4
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// 5
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}
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```
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### <span id="FanIn">FanIn</span>
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<p>Merge multiple channels into one channel until cancel the context.</p>
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<b>Signature:</b>
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```go
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func (c *Channel[T]) FanIn(ctx context.Context, channels ...<-chan T) <-chan T
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```
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<b>Example:</b>
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```go
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package main
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import (
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"context"
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"fmt"
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"github.com/duke-git/lancet/v2/concurrency"
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)
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func main() {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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c := concurrency.NewChannel[int]()
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channels := make([]<-chan int, 2)
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for i := 0; i < 2; i++ {
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channels[i] = c.Take(ctx, c.Repeat(ctx, i), 2)
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}
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chs := c.FanIn(ctx, channels...)
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for v := range chs {
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fmt.Println(v) //1 1 0 0 or 0 0 1 1
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}
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}
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```
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### <span id="Repeat">Repeat</span>
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<p>Create channel, put values into the channel repeatly until cancel the context.</p>
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<b>Signature:</b>
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```go
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func (c *Channel[T]) Repeat(ctx context.Context, values ...T) <-chan T
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```
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<b>Example:</b>
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```go
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package main
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import (
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"context"
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"fmt"
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"github.com/duke-git/lancet/v2/concurrency"
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)
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func main() {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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c := concurrency.NewChannel[int]()
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intStream := c.Take(ctx, c.Repeat(ctx, 1, 2), 4)
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for v := range intStream {
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fmt.Println(v)
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}
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// Output:
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// 1
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// 2
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// 1
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// 2
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}
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```
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### <span id="Generate">Generate</span>
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<p>Creates a channel, then put values into the channel.</p>
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<b>Signature:</b>
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```go
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func (c *Channel[T]) Generate(ctx context.Context, values ...T) <-chan T
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```
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<b>Example:</b>
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```go
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package main
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import (
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"context"
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"fmt"
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"github.com/duke-git/lancet/v2/concurrency"
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)
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func main() {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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c := concurrency.NewChannel[int]()
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intStream := c.Generate(ctx, 1, 2, 3)
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fmt.Println(<-intStream)
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fmt.Println(<-intStream)
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fmt.Println(<-intStream)
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// Output:
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// 1
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// 2
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// 3
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}
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```
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### <span id="RepeatFn">RepeatFn</span>
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<p>Create a channel, excutes fn repeatly, and put the result into the channel, until close context.</p>
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<b>Signature:</b>
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```go
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func (c *Channel[T]) RepeatFn(ctx context.Context, fn func() T) <-chan T
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```
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<b>Example:</b>
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```go
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package main
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import (
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"context"
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"fmt"
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"github.com/duke-git/lancet/v2/concurrency"
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)
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func main() {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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fn := func() string {
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return "hello"
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}
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c := concurrency.NewChannel[string]()
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intStream := c.Take(ctx, c.RepeatFn(ctx, fn), 3)
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for v := range intStream {
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fmt.Println(v)
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}
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// Output:
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// hello
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// hello
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// hello
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}
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```
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### <span id="Or">Or</span>
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<p>Read one or more channels into one channel, will close when any readin channel is closed.</p>
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<b>Signature:</b>
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```go
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func (c *Channel[T]) Or(channels ...<-chan T) <-chan T
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```
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<b>Example:</b>
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```go
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package main
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import (
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"context"
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"fmt"
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"github.com/duke-git/lancet/v2/concurrency"
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)
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func main() {
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sig := func(after time.Duration) <-chan any {
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c := make(chan any)
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go func() {
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defer close(c)
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time.Sleep(after)
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}()
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return c
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}
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start := time.Now()
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c := concurrency.NewChannel[any]()
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<-c.Or(
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sig(1*time.Second),
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sig(2*time.Second),
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sig(3*time.Second),
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)
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fmt.Println("done after %v", time.Since(start)) //1.003s
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}
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```
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### <span id="OrDone">OrDone</span>
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<p>Read a channel into another channel, will close until cancel context.</p>
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<b>Signature:</b>
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```go
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func (c *Channel[T]) OrDone(ctx context.Context, channel <-chan T) <-chan T
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```
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<b>Example:</b>
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```go
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package main
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import (
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"context"
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"fmt"
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"github.com/duke-git/lancet/v2/concurrency"
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)
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func main() {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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c := concurrency.NewChannel[int]()
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intStream := c.Take(ctx, c.Repeat(ctx, 1), 3)
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for v := range c.OrDone(ctx, intStream) {
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fmt.Println(v)
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}
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// Output:
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// 1
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// 1
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// 1
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}
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```
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### <span id="Take">Take</span>
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<p>Create a channel whose values are taken from another channel with limit number.</p>
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<b>Signature:</b>
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```go
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func (c *Channel[T]) Take(ctx context.Context, valueStream <-chan T, number int) <-chan T
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```
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<b>Example:</b>
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```go
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package main
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import (
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"context"
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"fmt"
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"github.com/duke-git/lancet/v2/concurrency"
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)
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func main() {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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numbers := make(chan int, 5)
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numbers <- 1
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numbers <- 2
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numbers <- 3
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numbers <- 4
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numbers <- 5
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defer close(numbers)
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c := concurrency.NewChannel[int]()
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intStream := c.Take(ctx, numbers, 3)
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for v := range intStream {
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fmt.Println(v)
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}
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// Output:
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// 1
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// 2
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// 3
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}
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```
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### <span id="Tee">Tee</span>
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<p>Split one chanel into two channels, until cancel the context.</p>
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<b>Signature:</b>
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```go
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func (c *Channel[T]) Tee(ctx context.Context, in <-chan T) (<-chan T, <-chan T)
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```
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<b>Example:</b>
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```go
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package main
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import (
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"context"
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"fmt"
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"github.com/duke-git/lancet/v2/concurrency"
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)
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func main() {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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c := concurrency.NewChannel[int]()
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intStream := c.Take(ctx, c.Repeat(ctx, 1), 2)
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ch1, ch2 := c.Tee(ctx, intStream)
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for v := range ch1 {
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fmt.Println(v)
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fmt.Println(<-ch2)
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}
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// Output:
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// 1
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// 1
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// 1
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// 1
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}
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```
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