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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "components/scheduler/promises/promise_executor.h" |
| 6 |
| 7 namespace promise { |
| 8 namespace internal { |
| 9 |
| 10 PromiseExecutor::PromiseExecutor() : cursor_(nullptr) {} |
| 11 |
| 12 PromiseExecutor::~PromiseExecutor(){}; |
| 13 |
| 14 void PromiseExecutor::StartResolveInternal(PromiseBase* promise) { |
| 15 if (promise->state() == PromiseBase::State::NEW || |
| 16 promise->state() == PromiseBase::State::CANCELLED) { |
| 17 promise->set_state(PromiseBase::State::PENDING); |
| 18 } |
| 19 |
| 20 promise->SetThisAndPrerequisitesAsShouldRun(this, true); |
| 21 } |
| 22 |
| 23 PromiseBase* PromiseExecutor::GetNextReadyPromise() { |
| 24 if (!eager_ready_set_.empty()) { |
| 25 PromiseBase* ready_promise = *eager_ready_set_.begin(); |
| 26 eager_ready_set_.erase(ready_promise); |
| 27 return ready_promise; |
| 28 } |
| 29 if (!lazy_ready_set_.empty()) { |
| 30 PromiseBase* ready_promise = *lazy_ready_set_.begin(); |
| 31 lazy_ready_set_.erase(ready_promise); |
| 32 return ready_promise; |
| 33 } |
| 34 return nullptr; |
| 35 } |
| 36 |
| 37 bool PromiseExecutor::ResolveOnePromise() { |
| 38 PromiseBase* ready_promise = GetNextReadyPromise(); |
| 39 if (!ready_promise) |
| 40 return false; |
| 41 |
| 42 ResolvePromise(ready_promise); |
| 43 return true; |
| 44 } |
| 45 |
| 46 void PromiseExecutor::ResolvePromise(PromiseBase* promise) { |
| 47 DCHECK(promise->state() != PromiseBase::State::RESOLVED); |
| 48 DCHECK(promise->AllPrerequisitesSatisfied()); |
| 49 |
| 50 if (promise->state() == PromiseBase::State::PARTIALLY_RESOLVED) { |
| 51 promise->MarkAsResolved(); |
| 52 } else { |
| 53 promise->ExecutorDrivenResolve(); |
| 54 } |
| 55 } |
| 56 |
| 57 void PromiseExecutor::RunUntilIdle() { |
| 58 while (ResolveOnePromise()) { |
| 59 } |
| 60 } |
| 61 |
| 62 bool PromiseExecutor::OnPromiseResolved(PromiseBase* promise) { |
| 63 bool new_work_to_do = false; |
| 64 for (PromiseBase* dependee : promise->dependants()) { |
| 65 if (dependee->AllPrerequisitesSatisfied()) { |
| 66 if (!dependee->can_run_now()) |
| 67 new_work_to_do = true; |
| 68 dependee->SchedulePromiseForResolve(); |
| 69 } |
| 70 } |
| 71 return new_work_to_do; |
| 72 } |
| 73 |
| 74 bool PromiseExecutor::OnPromiseRejected(PromiseBase* promise) { |
| 75 bool new_work_to_do = false; |
| 76 for (PromiseBase* dependee : promise->dependants()) { |
| 77 dependee->set_state(PromiseBase::State::DEPENDENCY_REJECTED); |
| 78 if (!dependee->can_run_now()) |
| 79 new_work_to_do = true; |
| 80 dependee->SchedulePromiseForResolve(); |
| 81 } |
| 82 return new_work_to_do; |
| 83 } |
| 84 |
| 85 } // namespace internal |
| 86 } // namespace promise |
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