56 lines
788 B
Go
56 lines
788 B
Go
package main
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import (
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"log"
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"sync"
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"time"
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)
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func subscribe(name string, data map[string]string, c *sync.Cond) {
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c.L.Lock()
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for len(data) == 0 {
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c.Wait()
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}
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log.Printf("[%s] %s\n", name, data["key"])
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c.L.Unlock()
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}
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func publish(name string, data map[string]string, c *sync.Cond) {
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time.Sleep(time.Second)
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c.L.Lock()
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data["key"] = "value"
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c.L.Unlock()
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log.Printf("[%s] data publisher\n", name)
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c.Broadcast()
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}
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func main() {
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data := map[string]string{}
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cond := sync.NewCond(&sync.Mutex{})
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wg := sync.WaitGroup{}
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wg.Add(3)
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go func() {
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defer wg.Done()
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subscribe("subscriber_1", data, cond)
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}()
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go func() {
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defer wg.Done()
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subscribe("subscriber_2", data, cond)
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}()
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go func() {
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defer wg.Done()
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publish("publisher", data, cond)
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}()
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wg.Wait()
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}
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