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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_SCHEDULER_H_ | 5 #ifndef CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_SCHEDULER_H_ |
6 #define CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_SCHEDULER_H_ | 6 #define CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_SCHEDULER_H_ |
7 | 7 |
8 #include <list> | 8 #include <list> |
9 | 9 |
| 10 #include "base/bind.h" |
10 #include "base/callback.h" | 11 #include "base/callback.h" |
11 #include "base/macros.h" | 12 #include "base/macros.h" |
| 13 #include "base/memory/weak_ptr.h" |
12 #include "content/common/content_export.h" | 14 #include "content/common/content_export.h" |
13 | 15 |
14 namespace content { | 16 namespace content { |
15 | 17 |
16 // TODO(jkarlin): Support readers and writers so operations can run in parallel. | 18 // TODO(jkarlin): Support readers and writers so operations can run in parallel. |
17 // TODO(jkarlin): Support operation identification so that ops can be checked in | 19 // TODO(jkarlin): Support operation identification so that ops can be checked in |
18 // DCHECKs. | 20 // DCHECKs. |
19 | 21 |
20 // CacheStorageScheduler runs the scheduled callbacks sequentially. Add an | 22 // CacheStorageScheduler runs the scheduled callbacks sequentially. Add an |
21 // operation by calling ScheduleOperation() with your callback. Once your | 23 // operation by calling ScheduleOperation() with your callback. Once your |
22 // operation is done be sure to call CompleteOperationAndRunNext() to schedule | 24 // operation is done be sure to call CompleteOperationAndRunNext() to schedule |
23 // the next operation. | 25 // the next operation. |
24 class CONTENT_EXPORT CacheStorageScheduler { | 26 class CONTENT_EXPORT CacheStorageScheduler { |
25 public: | 27 public: |
26 CacheStorageScheduler(); | 28 CacheStorageScheduler(); |
27 virtual ~CacheStorageScheduler(); | 29 virtual ~CacheStorageScheduler(); |
28 | 30 |
29 // Adds the operation to the tail of the queue and starts it if the scheduler | 31 // Adds the operation to the tail of the queue and starts it if the scheduler |
30 // is idle. | 32 // is idle. |
31 void ScheduleOperation(const base::Closure& closure); | 33 void ScheduleOperation(const base::Closure& closure); |
32 | 34 |
33 // Call this after each operation completes. It cleans up the current | 35 // Call this after each operation completes. It cleans up the current |
34 // operation and starts the next. | 36 // operation and starts the next. |
35 void CompleteOperationAndRunNext(); | 37 void CompleteOperationAndRunNext(); |
36 | 38 |
37 // Returns true if there are any running or pending operations. | 39 // Returns true if there are any running or pending operations. |
38 bool ScheduledOperations() const; | 40 bool ScheduledOperations() const; |
39 | 41 |
| 42 // Wraps |callback| to also call CompleteOperationAndRunNext. |
| 43 template <typename... Args> |
| 44 base::Callback<void(Args...)> WrapCallbackToRunNext( |
| 45 const base::Callback<void(Args...)>& callback) { |
| 46 return base::Bind(&CacheStorageScheduler::RunNextContinuation<Args...>, |
| 47 weak_ptr_factory_.GetWeakPtr(), callback); |
| 48 } |
| 49 |
40 private: | 50 private: |
41 void RunOperationIfIdle(); | 51 void RunOperationIfIdle(); |
42 | 52 |
| 53 template <typename... Args> |
| 54 void RunNextContinuation(const base::Callback<void(Args...)>& callback, |
| 55 Args... args) { |
| 56 // Grab a weak ptr to guard against the scheduler being deleted during the |
| 57 // callback. |
| 58 base::WeakPtr<CacheStorageScheduler> scheduler = |
| 59 weak_ptr_factory_.GetWeakPtr(); |
| 60 |
| 61 callback.Run(std::forward<Args>(args)...); |
| 62 if (scheduler) |
| 63 CompleteOperationAndRunNext(); |
| 64 } |
| 65 |
43 // The list of operations waiting on initialization. | 66 // The list of operations waiting on initialization. |
44 std::list<base::Closure> pending_operations_; | 67 std::list<base::Closure> pending_operations_; |
45 bool operation_running_; | 68 bool operation_running_; |
| 69 base::WeakPtrFactory<CacheStorageScheduler> weak_ptr_factory_; |
46 | 70 |
47 DISALLOW_COPY_AND_ASSIGN(CacheStorageScheduler); | 71 DISALLOW_COPY_AND_ASSIGN(CacheStorageScheduler); |
48 }; | 72 }; |
49 | 73 |
50 } // namespace content | 74 } // namespace content |
51 | 75 |
52 #endif // CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_SCHEDULER_H_ | 76 #endif // CONTENT_BROWSER_CACHE_STORAGE_CACHE_STORAGE_SCHEDULER_H_ |
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