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