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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// 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);
}
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