45 lines
1 KiB
Go
45 lines
1 KiB
Go
package reactive
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import "context"
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type Observable[T any] interface {
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Observe(ctx context.Context) <-chan Notification[T]
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}
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type FnObservable[T any] func(ctx context.Context) <-chan Notification[T]
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func (f FnObservable[T]) Observe(ctx context.Context) <-chan Notification[T] {
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return f(ctx)
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}
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func Cold[T any](f func(ctx context.Context) <-chan Notification[T]) Observable[T] {
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return FnObservable[T](f)
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}
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func LazyHot[T any](f func(chan<- Notification[T])) Observable[T] {
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var lazy chan Notification[T] = nil
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return FnObservable[T](func(ctx context.Context) <-chan Notification[T] {
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if lazy == nil {
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lazy = make(chan Notification[T])
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go func() {
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f(lazy)
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}()
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}
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return lazy
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})
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}
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func Hot[T any](c <-chan Notification[T]) Observable[T] {
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return FnObservable[T](func(ctx context.Context) <-chan Notification[T] { return c })
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}
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func FromChannel[T any](c <-chan T) Observable[T] {
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ch := make(chan Notification[T])
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go func() {
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for v := range c {
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ch <- MakeNext(v)
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}
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}()
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return Hot(ch)
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}
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