| // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/revocable_store.h" |
| |
| #include "base/logging.h" |
| |
| RevocableStore::Revocable::Revocable(RevocableStore* store) |
| : store_reference_(store->owning_reference_) { |
| // We AddRef() the owning reference. |
| DCHECK(store_reference_->store()); |
| store_reference_->store()->Add(this); |
| } |
| |
| RevocableStore::Revocable::~Revocable() { |
| if (!revoked()) { |
| // Notify the store of our destruction. |
| --(store_reference_->store()->count_); |
| } |
| } |
| |
| RevocableStore::RevocableStore() : count_(0) { |
| // Create a new owning reference. |
| owning_reference_ = new StoreRef(this); |
| } |
| |
| RevocableStore::~RevocableStore() { |
| // Revoke all the items in the store. |
| owning_reference_->set_store(NULL); |
| } |
| |
| void RevocableStore::Add(Revocable* item) { |
| DCHECK(!item->revoked()); |
| ++count_; |
| } |
| |
| void RevocableStore::RevokeAll() { |
| // We revoke all the existing items in the store and reset our count. |
| owning_reference_->set_store(NULL); |
| count_ = 0; |
| |
| // Then we create a new owning reference for new items that get added. |
| // This Release()s the old owning reference, allowing it to be freed after |
| // all the items that were in the store are eventually destroyed. |
| owning_reference_ = new StoreRef(this); |
| } |
| |