a250ec3ab9
This is a precursor to https://crrev.com/c/1053338 which introduces base::CheckedObserver. Existing observers will be unchecked (as they are already). There is no behavior change with this CL. The CL is mechanical. The bulk was done with variations on a sed script: git grep -l ' base::ObserverList<.*> .*;' -- '*.cc' '*.h' '*.mm' | \ xargs -IX sed -i -r 's/(^[ ]*)base::ObserverList<([^>]*)> (.*);/'\ '\1base::ObserverList<\2>::Unchecked \3;/' X With some manual follow-ups to get special cases. TBR=gab@chromium.org Bug: 842987 Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:ios-simulator-full-configs;luci.chromium.try:linux_layout_tests_slimming_paint_v2;luci.chromium.try:linux_mojo;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.mac:ios-simulator-cronet Change-Id: Idffe88e2b52f67f9226eb7b6d922070349dacc22 Reviewed-on: https://chromium-review.googlesource.com/1175511 Commit-Queue: Trent Apted <tapted@chromium.org> Reviewed-by: Gabriel Charette <gab@chromium.org> Cr-Commit-Position: refs/heads/master@{#584330}
98 lines
3.7 KiB
C++
98 lines
3.7 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CONTENT_BROWSER_NOTIFICATION_SERVICE_IMPL_H_
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#define CONTENT_BROWSER_NOTIFICATION_SERVICE_IMPL_H_
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#include <map>
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#include "base/macros.h"
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#include "base/observer_list.h"
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#include "content/common/content_export.h"
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#include "content/public/browser/notification_service.h"
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namespace content {
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class NotificationObserver;
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class NotificationRegistrar;
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class CONTENT_EXPORT NotificationServiceImpl : public NotificationService {
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public:
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static NotificationServiceImpl* current();
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// Normally instantiated when the thread is created. Not all threads have
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// a NotificationService. Only one instance should be created per thread.
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NotificationServiceImpl();
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~NotificationServiceImpl() override;
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// NotificationService:
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void Notify(int type,
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const NotificationSource& source,
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const NotificationDetails& details) override;
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private:
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friend class NotificationRegistrar;
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typedef base::ObserverList<NotificationObserver>::Unchecked
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NotificationObserverList;
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typedef std::map<uintptr_t, NotificationObserverList*> NotificationSourceMap;
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typedef std::map<int, NotificationSourceMap> NotificationObserverMap;
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typedef std::map<int, int> NotificationObserverCount;
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// Convenience function to determine whether a source has a
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// NotificationObserverList in the given map;
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static bool HasKey(const NotificationSourceMap& map,
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const NotificationSource& source);
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// NOTE: Rather than using this directly, you should use a
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// NotificationRegistrar.
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//
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// Registers a NotificationObserver to be called whenever a matching
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// notification is posted. Observer is a pointer to an object subclassing
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// NotificationObserver to be notified when an event matching the other two
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// parameters is posted to this service. Type is the type of events to be
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// notified about (or NOTIFICATION_ALL to receive events of all
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// types).
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// Source is a NotificationSource object (created using
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// "Source<classname>(pointer)"), if this observer only wants to
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// receive events from that object, or NotificationService::AllSources()
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// to receive events from all sources.
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//
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// A given observer can be registered only once for each combination of
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// type and source. If the same object is registered more than once,
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// it must be removed for each of those combinations of type and source later.
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//
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// The caller retains ownership of the object pointed to by observer.
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void AddObserver(NotificationObserver* observer,
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int type,
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const NotificationSource& source);
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// NOTE: Rather than using this directly, you should use a
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// NotificationRegistrar.
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//
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// Removes the object pointed to by observer from receiving notifications
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// that match type and source. If no object matching the parameters is
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// currently registered, this method is a no-op.
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void RemoveObserver(NotificationObserver* observer,
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int type,
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const NotificationSource& source);
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// Keeps track of the observers for each type of notification.
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// Until we get a prohibitively large number of notification types,
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// a simple array is probably the fastest way to dispatch.
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NotificationObserverMap observers_;
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#ifndef NDEBUG
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// Used to check to see that AddObserver and RemoveObserver calls are
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// balanced.
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NotificationObserverCount observer_counts_;
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#endif
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DISALLOW_COPY_AND_ASSIGN(NotificationServiceImpl);
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};
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} // namespace content
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#endif // CONTENT_BROWSER_NOTIFICATION_SERVICE_IMPL_H_
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