| // Copyright 2008, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #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); |
| } |