add Concurrency entity for worker #1405
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,101 @@ | ||
| // Copyright (c) 2017-2021 Uber Technologies Inc. | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
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| package worker | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "sync" | ||
| "time" | ||
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| "github.com/marusama/semaphore/v2" | ||
| ) | ||
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| var _ Permit = (*permit)(nil) | ||
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| // ConcurrencyLimit contains synchronization primitives for dynamically controlling the concurrencies in workers | ||
| type ConcurrencyLimit struct { | ||
| PollerPermit Permit // controls concurrency of pollers | ||
| TaskPermit Permit // controlls concurrency of task processings | ||
| } | ||
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| // Permit is an adaptive permit issuer to control concurrency | ||
| type Permit interface { | ||
| Acquire(context.Context, int) error | ||
| AcquireChan(context.Context, *sync.WaitGroup) <-chan struct{} | ||
| Quota() int | ||
| SetQuota(int) | ||
|
There was a problem hiding this comment. Seems worth splitting this out so you don't have to no-op it. It isn't even needed - this all compiles fine with |
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| Count() int | ||
| Release(count int) | ||
| } | ||
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| type permit struct { | ||
| sem semaphore.Semaphore | ||
| } | ||
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| // NewPermit creates a dynamic permit that's resizable | ||
| func NewPermit(initCount int) Permit { | ||
| return &permit{sem: semaphore.New(initCount)} | ||
| } | ||
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| // Acquire is blocking until a permit is acquired or returns error after context is done | ||
| // Remember to call Release(count) to release the permit after usage | ||
| func (p *permit) Acquire(ctx context.Context, count int) error { | ||
| if err := p.sem.Acquire(ctx, count); err != nil { | ||
| return fmt.Errorf("failed to acquire permit before context is done: %w", err) | ||
| } | ||
| return nil | ||
| } | ||
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| // AcquireChan returns a permit ready channel. Similar to Acquire, but non-blocking. | ||
| // Remember to call Release(1) to release the permit after usage | ||
| func (p *permit) AcquireChan(ctx context.Context, wg *sync.WaitGroup) <-chan struct{} { | ||
| ch := make(chan struct{}) | ||
| wg.Add(1) | ||
| go func() { | ||
| defer wg.Done() | ||
| if err := p.sem.Acquire(ctx, 1); err != nil { | ||
| return | ||
| } | ||
| select { // try to send to channel, but don't block if listener is gone | ||
| case ch <- struct{}{}: | ||
| case <-time.After(10 * time.Millisecond): // wait time is needed to avoid race condition of channel sending | ||
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| p.sem.Release(1) | ||
| } | ||
| }() | ||
| return ch | ||
| } | ||
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| func (p *permit) Release(count int) { | ||
| p.sem.Release(count) | ||
| } | ||
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| func (p *permit) Quota() int { | ||
| return p.sem.GetLimit() | ||
| } | ||
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| func (p *permit) SetQuota(c int) { | ||
| p.sem.SetLimit(c) | ||
| } | ||
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| func (p *permit) Count() int { | ||
| return p.sem.GetCount() | ||
| } | ||
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