66 lines
1.5 KiB
Go
66 lines
1.5 KiB
Go
package main
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import (
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"fmt"
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"time"
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"gopkg.in/go-playground/pool.v3"
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)
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var gpool = pool.New()
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func main() {
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// OK so maybe you want a long running pool to maximize throughput
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// yet limit the # of workers eg. email provider may limit the # of
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// concurrent connection you can have so spin up a pool with the #
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// of workers being that limit and then can batch
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// (or send per unit if desired) then can maximize email sending throughput
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// without breaking your providers limits.
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batch := gpool.Batch()
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// for max speed Queue in another goroutine
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// but it is not required, just can't start reading results
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// until all items are Queued.
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go func() {
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for i := 0; i < 10; i++ {
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batch.Queue(sendEmail("email content"))
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}
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// DO NOT FORGET THIS OR GOROUTINES WILL DEADLOCK
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// if calling Cancel() it calles QueueComplete() internally
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batch.QueueComplete()
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}()
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for email := range batch.Results() {
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if err := email.Error(); err != nil {
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// handle error
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// maybe call batch.Cancel()
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}
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// use return value
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fmt.Println(email.Value().(bool))
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}
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}
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func sendEmail(email string) pool.WorkFunc {
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return func(wu pool.WorkUnit) (interface{}, error) {
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// simulate waiting for something, like TCP connection to be established
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// or connection from pool grabbed
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time.Sleep(time.Second * 1)
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if wu.IsCancelled() {
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// return values not used
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return nil, nil
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}
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// ready for processing...
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return true, nil // everything ok, send nil, error if not
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}
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}
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