Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=8 sts=2 et sw=2 tw=80: */
       3             : // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
       4             : // Use of this source code is governed by a BSD-style license that can be
       5             : // found in the LICENSE file.
       6             : 
       7             : #include "base/revocable_store.h"
       8             : 
       9             : #include "base/logging.h"
      10             : 
      11           0 : RevocableStore::Revocable::Revocable(RevocableStore* store)
      12           0 :     : store_reference_(store->owning_reference_) {
      13             :   // We AddRef() the owning reference.
      14           0 :   DCHECK(store_reference_->store());
      15           0 :   store_reference_->store()->Add(this);
      16           0 : }
      17             : 
      18           0 : RevocableStore::Revocable::~Revocable() {
      19           0 :   if (!revoked()) {
      20             :     // Notify the store of our destruction.
      21           0 :     --(store_reference_->store()->count_);
      22             :   }
      23           0 : }
      24             : 
      25          44 : RevocableStore::RevocableStore() : count_(0) {
      26             :   // Create a new owning reference.
      27          44 :   owning_reference_ = new StoreRef(this);
      28          44 : }
      29             : 
      30          26 : RevocableStore::~RevocableStore() {
      31             :   // Revoke all the items in the store.
      32          13 :   owning_reference_->set_store(NULL);
      33          13 : }
      34             : 
      35           0 : void RevocableStore::Add(Revocable* item) {
      36           0 :   DCHECK(!item->revoked());
      37           0 :   ++count_;
      38           0 : }
      39             : 
      40           0 : void RevocableStore::RevokeAll() {
      41             :   // We revoke all the existing items in the store and reset our count.
      42           0 :   owning_reference_->set_store(NULL);
      43           0 :   count_ = 0;
      44             : 
      45             :   // Then we create a new owning reference for new items that get added.
      46             :   // This Release()s the old owning reference, allowing it to be freed after
      47             :   // all the items that were in the store are eventually destroyed.
      48           0 :   owning_reference_ = new StoreRef(this);
      49           0 : }