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// 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 "chrome/common/notification_service.h"
#include "base/lazy_instance.h"
#include "base/thread_local.h"
static base::LazyInstance<base::ThreadLocalPointer<NotificationService> >
lazy_tls_ptr(base::LINKER_INITIALIZED);
// static
NotificationService* NotificationService::current() {
return lazy_tls_ptr.Pointer()->Get();
}
// 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
lazy_tls_ptr.Pointer()->Set(this);
}
void NotificationService::AddObserver(NotificationObserver* observer,
NotificationType type,
const NotificationSource& source) {
DCHECK(type.value < NotificationType::NOTIFICATION_TYPE_COUNT);
// We have gotten some crashes where the observer pointer is NULL. The problem
// is that this happens when we actually execute a notification, so have no
// way of knowing who the bad observer was. We want to know when this happens
// in release mode so we know what code to blame the crash on (since this is
// guaranteed to crash later).
CHECK(observer);
NotificationObserverList* observer_list;
if (HasKey(observers_[type.value], source)) {
observer_list = observers_[type.value][source.map_key()];
} else {
observer_list = new NotificationObserverList;
observers_[type.value][source.map_key()] = observer_list;
}
observer_list->AddObserver(observer);
#ifndef NDEBUG
++observer_counts_[type.value];
#endif
}
void NotificationService::RemoveObserver(NotificationObserver* observer,
NotificationType type,
const NotificationSource& source) {
DCHECK(type.value < NotificationType::NOTIFICATION_TYPE_COUNT);
DCHECK(HasKey(observers_[type.value], source));
NotificationObserverList* observer_list =
observers_[type.value][source.map_key()];
if (observer_list) {
observer_list->RemoveObserver(observer);
#ifndef NDEBUG
--observer_counts_[type.value];
#endif
}
// TODO(jhughes): Remove observer list from map if empty?
}
void NotificationService::Notify(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details) {
DCHECK(type.value > NotificationType::ALL) <<
"Allowed for observing, but not posting.";
DCHECK(type.value < NotificationType::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_[NotificationType::ALL], AllSources()) &&
source != AllSources()) {
FOR_EACH_OBSERVER(NotificationObserver,
*observers_[NotificationType::ALL][AllSources().map_key()],
Observe(type, source, details));
}
// Notify observers of all types and the given source
if (HasKey(observers_[NotificationType::ALL], source)) {
FOR_EACH_OBSERVER(NotificationObserver,
*observers_[NotificationType::ALL][source.map_key()],
Observe(type, source, details));
}
// Notify observers of the given type and all sources
if (HasKey(observers_[type.value], AllSources()) &&
source != AllSources()) {
FOR_EACH_OBSERVER(NotificationObserver,
*observers_[type.value][AllSources().map_key()],
Observe(type, source, details));
}
// Notify observers of the given type and the given source
if (HasKey(observers_[type.value], source)) {
FOR_EACH_OBSERVER(NotificationObserver,
*observers_[type.value][source.map_key()],
Observe(type, source, details));
}
}
NotificationService::~NotificationService() {
lazy_tls_ptr.Pointer()->Set(NULL);
#ifndef NDEBUG
for (int i = 0; i < NotificationType::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 < NotificationType::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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