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// 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 "chrome/common/notification_service.h"
int NotificationService::tls_index_ = ThreadLocalStorage::Alloc();
/* static */
bool NotificationService::HasKey(const NotificationSourceMap& map,
const NotificationSource& source) {
return map.find(source.map_key()) != map.end();
}
NotificationService::NotificationService() {
DCHECK(current() == NULL);
#ifndef NDEBUG
memset(observer_counts_, 0, sizeof(observer_counts_));
#endif
ThreadLocalStorage::Set(tls_index_, this);
}
void NotificationService::AddObserver(NotificationObserver* observer,
NotificationType type,
const NotificationSource& source) {
DCHECK(type < NOTIFICATION_TYPE_COUNT);
NotificationObserverList* observer_list;
if (HasKey(observers_[type], source)) {
observer_list = observers_[type][source.map_key()];
} else {
observer_list = new NotificationObserverList;
observers_[type][source.map_key()] = observer_list;
}
observer_list->AddObserver(observer);
#ifndef NDEBUG
++observer_counts_[type];
#endif
}
void NotificationService::RemoveObserver(NotificationObserver* observer,
NotificationType type,
const NotificationSource& source) {
DCHECK(type < NOTIFICATION_TYPE_COUNT);
DCHECK(HasKey(observers_[type], source));
NotificationObserverList* observer_list = observers_[type][source.map_key()];
if (observer_list) {
observer_list->RemoveObserver(observer);
#ifndef NDEBUG
--observer_counts_[type];
#endif
}
// TODO(jhughes): Remove observer list from map if empty?
}
void NotificationService::Notify(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details) {
DCHECK(type > NOTIFY_ALL); // Allowed for subscription, but not posting.
DCHECK(type < NOTIFICATION_TYPE_COUNT);
// There's no particular reason for the order in which the different
// classes of observers get notified here.
// Notify observers of all types and all sources
if (HasKey(observers_[NOTIFY_ALL], AllSources()) &&
source != AllSources())
FOR_EACH_OBSERVER(NotificationObserver,
*observers_[NOTIFY_ALL][AllSources().map_key()],
Observe(type, source, details));
// Notify observers of all types and the given source
if (HasKey(observers_[NOTIFY_ALL], source))
FOR_EACH_OBSERVER(NotificationObserver,
*observers_[NOTIFY_ALL][source.map_key()],
Observe(type, source, details));
// Notify observers of the given type and all sources
if (HasKey(observers_[type], AllSources()) &&
source != AllSources())
FOR_EACH_OBSERVER(NotificationObserver,
*observers_[type][AllSources().map_key()],
Observe(type, source, details));
// Notify observers of the given type and the given source
if (HasKey(observers_[type], source))
FOR_EACH_OBSERVER(NotificationObserver,
*observers_[type][source.map_key()],
Observe(type, source, details));
}
NotificationService::~NotificationService() {
ThreadLocalStorage::Set(tls_index_, NULL);
#ifndef NDEBUG
for (int i = 0; i < NOTIFICATION_TYPE_COUNT; i++) {
if (observer_counts_[i] > 0) {
LOG(WARNING) << observer_counts_[i] << " notification observer(s) leaked"
<< " of notification type " << i;
}
}
#endif
for (int i = 0; i < NOTIFICATION_TYPE_COUNT; i++) {
NotificationSourceMap omap = observers_[i];
for (NotificationSourceMap::iterator it = omap.begin();
it != omap.end(); ++it) {
delete it->second;
}
}
}
NotificationObserver::~NotificationObserver() {}
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