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Concurrent map using channels
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package main | |
import "fmt" | |
type safeMap struct { | |
data map[string]string | |
readch, writech chan chan string | |
} | |
func newSafeMap() *concurrentMap { | |
m := &safeMap{ | |
data: make(map[string]string), | |
readch: make(chan chan string), | |
writech: make(chan chan string), | |
} | |
go func() { | |
for { | |
select { | |
case ch := <-m.readch: | |
key := <-ch | |
ch <- m.data[key] | |
case ch := <-m.writech: | |
key := <-ch | |
value := <-ch | |
m.data[key] = value | |
} | |
} | |
}() | |
return m | |
} | |
func (m *safeMap) get(key string) string { | |
ch := make(chan string) | |
m.readch <- ch | |
ch <- key | |
return <-ch | |
} | |
func (m *safeMap) set(key, value string) { | |
ch := make(chan string) | |
m.writech <- ch | |
ch <- key | |
ch <- value | |
} | |
func main() { | |
m := newSafeMap() | |
done := make(chan bool) | |
go func() { | |
m.set("foo", "a") | |
done <- true | |
}() | |
m.set("bar", "b") | |
<-done | |
fmt.Println(m.get("foo")) | |
} |
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