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// Copyright 2017 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
}
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