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// Copyright (c) 2012 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 "sync/notifier/sync_notifier_registrar.h"
#include <cstddef>
#include <utility>
#include "base/logging.h"
namespace syncer {
SyncNotifierRegistrar::SyncNotifierRegistrar() {}
SyncNotifierRegistrar::~SyncNotifierRegistrar() {
DCHECK(thread_checker_.CalledOnValidThread());
}
void SyncNotifierRegistrar::RegisterHandler(SyncNotifierObserver* handler) {
DCHECK(thread_checker_.CalledOnValidThread());
CHECK(handler);
CHECK(!handlers_.HasObserver(handler));
handlers_.AddObserver(handler);
}
void SyncNotifierRegistrar::UpdateRegisteredIds(
SyncNotifierObserver* handler,
const ObjectIdSet& ids) {
DCHECK(thread_checker_.CalledOnValidThread());
CHECK(handler);
CHECK(handlers_.HasObserver(handler));
// Remove all existing entries for |handler|.
for (IdHandlerMap::iterator it = id_to_handler_map_.begin();
it != id_to_handler_map_.end(); ) {
if (it->second == handler) {
IdHandlerMap::iterator erase_it = it;
++it;
id_to_handler_map_.erase(erase_it);
} else {
++it;
}
}
// Now add the entries for |handler|. We keep track of the last insertion
// point so we only traverse the map once to insert all the new entries.
IdHandlerMap::iterator insert_it = id_to_handler_map_.begin();
for (ObjectIdSet::const_iterator it = ids.begin(); it != ids.end(); ++it) {
insert_it =
id_to_handler_map_.insert(insert_it, std::make_pair(*it, handler));
CHECK_EQ(handler, insert_it->second)
<< "Duplicate registration: trying to register "
<< ObjectIdToString(insert_it->first) << " for "
<< handler << " when it's already registered for "
<< insert_it->second;
}
}
void SyncNotifierRegistrar::UnregisterHandler(SyncNotifierObserver* handler) {
DCHECK(thread_checker_.CalledOnValidThread());
CHECK(handler);
CHECK(handlers_.HasObserver(handler));
handlers_.RemoveObserver(handler);
}
ObjectIdSet SyncNotifierRegistrar::GetAllRegisteredIds() const {
DCHECK(thread_checker_.CalledOnValidThread());
ObjectIdSet registered_ids;
for (IdHandlerMap::const_iterator it = id_to_handler_map_.begin();
it != id_to_handler_map_.end(); ++it) {
registered_ids.insert(it->first);
}
return registered_ids;
}
void SyncNotifierRegistrar::DispatchInvalidationsToHandlers(
const ObjectIdStateMap& id_state_map,
IncomingNotificationSource source) {
DCHECK(thread_checker_.CalledOnValidThread());
// If we have no handlers, there's nothing to do.
if (!handlers_.might_have_observers()) {
return;
}
typedef std::map<SyncNotifierObserver*, ObjectIdStateMap> DispatchMap;
DispatchMap dispatch_map;
for (ObjectIdStateMap::const_iterator it = id_state_map.begin();
it != id_state_map.end(); ++it) {
SyncNotifierObserver* const handler = ObjectIdToHandler(it->first);
// Filter out invalidations for IDs with no handler.
if (handler)
dispatch_map[handler].insert(*it);
}
// Emit invalidations only for handlers in |handlers_|.
ObserverListBase<SyncNotifierObserver>::Iterator it(handlers_);
SyncNotifierObserver* handler = NULL;
while ((handler = it.GetNext()) != NULL) {
DispatchMap::const_iterator dispatch_it = dispatch_map.find(handler);
if (dispatch_it != dispatch_map.end())
handler->OnIncomingNotification(dispatch_it->second, source);
}
}
void SyncNotifierRegistrar::EmitOnNotificationsEnabled() {
DCHECK(thread_checker_.CalledOnValidThread());
FOR_EACH_OBSERVER(SyncNotifierObserver, handlers_, OnNotificationsEnabled());
}
void SyncNotifierRegistrar::EmitOnNotificationsDisabled(
NotificationsDisabledReason reason) {
DCHECK(thread_checker_.CalledOnValidThread());
FOR_EACH_OBSERVER(SyncNotifierObserver, handlers_,
OnNotificationsDisabled(reason));
}
void SyncNotifierRegistrar::DetachFromThreadForTest() {
DCHECK(thread_checker_.CalledOnValidThread());
thread_checker_.DetachFromThread();
}
SyncNotifierObserver* SyncNotifierRegistrar::ObjectIdToHandler(
const invalidation::ObjectId& id) {
DCHECK(thread_checker_.CalledOnValidThread());
IdHandlerMap::const_iterator it = id_to_handler_map_.find(id);
return (it == id_to_handler_map_.end()) ? NULL : it->second;
}
} // namespace syncer
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