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