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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| // The MIT License | ||
| // | ||
| // Copyright (c) 2022 Temporal Technologies Inc. All rights reserved. | ||
| // | ||
| // 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. | ||
|
|
||
| package internal | ||
|
|
||
| // eagerWorker is the minimal worker interface needed for eager activities and workflows | ||
| type eagerWorker interface { | ||
| // tryReserveSlot tries to reserver a task slot on the worker without blocking | ||
| // caller is expected to release the slot with releaseSlot | ||
| tryReserveSlot() bool | ||
| // releaseSlot release a task slot acquired by tryReserveSlot | ||
| releaseSlot() | ||
| // processTaskAsync process a new task on the worker asynchronously and | ||
| // call callback once complete | ||
| processTaskAsync(task interface{}, callback func()) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| // The MIT License | ||
| // | ||
| // Copyright (c) 2022 Temporal Technologies Inc. All rights reserved. | ||
| // | ||
| // 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. | ||
|
|
||
| package internal | ||
|
|
||
| import ( | ||
| "math/rand" | ||
| "sync" | ||
| "sync/atomic" | ||
|
|
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| "go.temporal.io/api/workflowservice/v1" | ||
| ) | ||
|
|
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| // eagerWorkflowDispatcher is responsible for finding an available worker for an eager workflow task. | ||
| type eagerWorkflowDispatcher struct { | ||
| lock sync.RWMutex | ||
| workersByTaskQueue map[string][]eagerWorker | ||
| } | ||
|
|
||
| // registerWorker registers a worker that can be used for eager workflow dispatch | ||
| func (e *eagerWorkflowDispatcher) registerWorker(worker *workflowWorker) { | ||
| e.lock.Lock() | ||
| defer e.lock.Unlock() | ||
| e.workersByTaskQueue[worker.executionParameters.TaskQueue] = append(e.workersByTaskQueue[worker.executionParameters.TaskQueue], worker.worker) | ||
| } | ||
|
|
||
| // applyToRequest updates request if eager workflow dispatch is possible and returns the eagerWorkflowExecutor to use | ||
| func (e *eagerWorkflowDispatcher) applyToRequest(request *workflowservice.StartWorkflowExecutionRequest) *eagerWorkflowExecutor { | ||
| // Try every worker that is assigned to the desired task queue. | ||
| e.lock.RLock() | ||
| workers := e.workersByTaskQueue[request.GetTaskQueue().Name] | ||
| randWorkers := make([]eagerWorker, len(workers)) | ||
| // Copy the slice so we can release the lock. | ||
| copy(randWorkers, workers) | ||
| e.lock.RUnlock() | ||
| rand.Shuffle(len(randWorkers), func(i, j int) { randWorkers[i], randWorkers[j] = randWorkers[j], randWorkers[i] }) | ||
| for _, worker := range randWorkers { | ||
| if worker.tryReserveSlot() { | ||
| request.RequestEagerExecution = true | ||
| return &eagerWorkflowExecutor{ | ||
| worker: worker, | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // eagerWorkflowExecutor is a worker-scoped executor for an eager workflow task. | ||
| type eagerWorkflowExecutor struct { | ||
| handledResponse atomic.Bool | ||
| worker eagerWorker | ||
| } | ||
|
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| // handleResponse of an eager workflow task from a StartWorkflowExecution request. | ||
| func (e *eagerWorkflowExecutor) handleResponse(response *workflowservice.PollWorkflowTaskQueueResponse) { | ||
| if !e.handledResponse.CompareAndSwap(false, true) { | ||
| panic("eagerWorkflowExecutor trying to handle multiple responses") | ||
| } | ||
| // Asynchronously execute the task | ||
| task := &eagerWorkflowTask{ | ||
| task: response, | ||
| } | ||
| e.worker.processTaskAsync(task, func() { | ||
| // The processTaskAsync does not do this itself because our task is *eagerWorkflowTask, not *polledTask. | ||
| e.worker.releaseSlot() | ||
| }) | ||
| } | ||
|
|
||
| // release the executor task slot this eagerWorkflowExecutor was holding. | ||
| // If it is currently handling a responses or has already released the task slot | ||
| // then do nothing. | ||
| func (e *eagerWorkflowExecutor) release() { | ||
| if e.handledResponse.CompareAndSwap(false, true) { | ||
| // Assume there is room because it is reserved on creation, so we make a blocking send. | ||
| // The processTask does not do this itself because our task is not *polledTask. | ||
| e.worker.releaseSlot() | ||
| } else { | ||
| panic("trying to release an eagerWorkflowExecutor that has already been released") | ||
| } | ||
| } |
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