Created
October 18, 2022 09:05
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concurrency
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package main | |
import ( | |
"container/list" | |
"fmt" | |
"github.com/tjarratt/babble" | |
"sync" | |
"sync/atomic" | |
"unsafe" | |
) | |
func main() { | |
builder := NewRequestBuilder() | |
var futures [5]*FutureResponse | |
builder.ForkJoin(func(c *Concurrent) { | |
futures[0] = c.Get() | |
futures[1] = c.Get() | |
futures[2] = c.Get() | |
futures[3] = c.Get() | |
futures[4] = c.Get() | |
}) | |
for i := range futures { | |
fmt.Println(futures[i].Response().Body) | |
} | |
} | |
type RequestBuilder struct { | |
babbler babble.Babbler | |
} | |
func NewRequestBuilder() *RequestBuilder { | |
return &RequestBuilder{babbler: babble.NewBabbler()} | |
} | |
func (rb *RequestBuilder) Get() *Response { | |
return &Response{Body: rb.babbler.Babble()} | |
} | |
type Response struct { | |
Body string | |
} | |
func (rb *RequestBuilder) ForkJoin(f func(*Concurrent)) { | |
c := new(Concurrent) | |
c.requestBuilder = rb | |
f(c) | |
c.wg.Add(c.list.Len()) | |
for node := c.list.Front(); node != nil; node = node.Next() { | |
go node.Value.(func())() | |
} | |
c.wg.Wait() | |
} | |
type Concurrent struct { | |
list list.List | |
wg sync.WaitGroup | |
requestBuilder *RequestBuilder | |
} | |
func (c *Concurrent) Get() *FutureResponse { | |
fr := new(FutureResponse) | |
future := func() { | |
defer c.wg.Done() | |
message := c.requestBuilder.Get() | |
atomic.StorePointer(&fr.pointer, unsafe.Pointer(message)) | |
} | |
c.list.PushBack(future) | |
return fr | |
} | |
type FutureResponse struct { | |
pointer unsafe.Pointer | |
} | |
func (fr *FutureResponse) Response() *Response { | |
return (*Response)(fr.pointer) | |
} |
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