The Tor Browser / file comparison
comparison: ipc/chromium/src/base/revocable_store.h
ipc/chromium/src/base/revocable_store.h
- branch
- TOR_BUG_3246
- changeset 6
- 8bccb770b82d
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| -1:000000000000 | 0:071de1728efa |
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| 1 // Copyright (c) 2006-2008 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 #ifndef BASE_REVOCABLE_STORE_H_ | |
| 6 #define BASE_REVOCABLE_STORE_H_ | |
| 7 | |
| 8 #include "base/ref_counted.h" | |
| 9 | |
| 10 // |RevocableStore| is a container of items that can be removed from the store. | |
| 11 class RevocableStore { | |
| 12 public: | |
| 13 // A |StoreRef| is used to link the |RevocableStore| to its items. There is | |
| 14 // one StoreRef per store, and each item holds a reference to it. If the | |
| 15 // store wishes to revoke its items, it sets |store_| to null. Items are | |
| 16 // permitted to release their reference to the |StoreRef| when they no longer | |
| 17 // require the store. | |
| 18 class StoreRef : public base::RefCounted<StoreRef> { | |
| 19 public: | |
| 20 StoreRef(RevocableStore* store) : store_(store) { } | |
| 21 | |
| 22 void set_store(RevocableStore* store) { store_ = store; } | |
| 23 RevocableStore* store() const { return store_; } | |
| 24 | |
| 25 private: | |
| 26 RevocableStore* store_; | |
| 27 | |
| 28 DISALLOW_EVIL_CONSTRUCTORS(StoreRef); | |
| 29 }; | |
| 30 | |
| 31 // An item in the store. On construction, the object adds itself to the | |
| 32 // store. | |
| 33 class Revocable { | |
| 34 public: | |
| 35 Revocable(RevocableStore* store); | |
| 36 ~Revocable(); | |
| 37 | |
| 38 // This item has been revoked if it no longer has a pointer to the store. | |
| 39 bool revoked() const { return !store_reference_->store(); } | |
| 40 | |
| 41 private: | |
| 42 // We hold a reference to the store through this ref pointer. We release | |
| 43 // this reference on destruction. | |
| 44 scoped_refptr<StoreRef> store_reference_; | |
| 45 | |
| 46 DISALLOW_EVIL_CONSTRUCTORS(Revocable); | |
| 47 }; | |
| 48 | |
| 49 RevocableStore(); | |
| 50 ~RevocableStore(); | |
| 51 | |
| 52 // Revokes all the items in the store. | |
| 53 void RevokeAll(); | |
| 54 | |
| 55 // Returns true if there are no items in the store. | |
| 56 bool empty() const { return count_ == 0; } | |
| 57 | |
| 58 private: | |
| 59 friend class Revocable; | |
| 60 | |
| 61 // Adds an item to the store. To add an item to the store, construct it | |
| 62 // with a pointer to the store. | |
| 63 void Add(Revocable* item); | |
| 64 | |
| 65 // This is the reference the unrevoked items in the store hold. | |
| 66 scoped_refptr<StoreRef> owning_reference_; | |
| 67 | |
| 68 // The number of unrevoked items in the store. | |
| 69 int count_; | |
| 70 | |
| 71 DISALLOW_EVIL_CONSTRUCTORS(RevocableStore); | |
| 72 }; | |
| 73 | |
| 74 #endif // BASE_REVOCABLE_STORE_H_ |
