mirror of https://github.com/status-im/op-geth.git
57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
// Copyright 2016 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package event_test
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/ethereum/go-ethereum/event"
|
|
)
|
|
|
|
func ExampleNewSubscription() {
|
|
// Create a subscription that sends 10 integers on ch.
|
|
ch := make(chan int)
|
|
sub := event.NewSubscription(func(quit <-chan struct{}) error {
|
|
for i := 0; i < 10; i++ {
|
|
select {
|
|
case ch <- i:
|
|
case <-quit:
|
|
fmt.Println("unsubscribed")
|
|
return nil
|
|
}
|
|
}
|
|
return nil
|
|
})
|
|
|
|
// This is the consumer. It reads 5 integers, then aborts the subscription.
|
|
// Note that Unsubscribe waits until the producer has shut down.
|
|
for i := range ch {
|
|
fmt.Println(i)
|
|
if i == 4 {
|
|
sub.Unsubscribe()
|
|
break
|
|
}
|
|
}
|
|
// Output:
|
|
// 0
|
|
// 1
|
|
// 2
|
|
// 3
|
|
// 4
|
|
// unsubscribed
|
|
}
|