mirror of
https://github.com/chrislusf/seaweedfs
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41 lines
895 B
Go
41 lines
895 B
Go
package util
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// initial version comes from https://github.com/korovkin/limiter/blob/master/limiter.go
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// LimitedConcurrentExecutor object
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type LimitedConcurrentExecutor struct {
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limit int
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tokenChan chan int
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}
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func NewLimitedConcurrentExecutor(limit int) *LimitedConcurrentExecutor {
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// allocate a limiter instance
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c := &LimitedConcurrentExecutor{
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limit: limit,
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tokenChan: make(chan int, limit),
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}
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// allocate the tokenChan:
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for i := 0; i < c.limit; i++ {
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c.tokenChan <- i
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}
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return c
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}
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// Execute adds a function to the execution queue.
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// if num of go routines allocated by this instance is < limit
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// launch a new go routine to execute job
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// else wait until a go routine becomes available
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func (c *LimitedConcurrentExecutor) Execute(job func()) {
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token := <-c.tokenChan
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go func() {
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defer func() {
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c.tokenChan <- token
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}()
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// run the job
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job()
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}()
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}
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