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/*
* Copyright (C) 2008 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
*/
#ifndef NetworkStateNotifier_h
#define NetworkStateNotifier_h
#include "public/platform/WebConnectionType.h"
#include "wtf/FastAllocBase.h"
#include "wtf/HashMap.h"
#include "wtf/Noncopyable.h"
#include "wtf/ThreadingPrimitives.h"
#include "wtf/Vector.h"
namespace blink {
class ExecutionContext;
class NetworkStateNotifier {
WTF_MAKE_NONCOPYABLE(NetworkStateNotifier); WTF_MAKE_FAST_ALLOCATED;
public:
class NetworkStateObserver {
public:
// Will be called on the thread of the context passed in addObserver.
virtual void connectionTypeChange(blink::WebConnectionType) = 0;
};
NetworkStateNotifier()
: m_isOnLine(true)
, m_type(blink::ConnectionTypeOther)
, m_testUpdatesOnly(false)
{
}
bool onLine() const
{
MutexLocker locker(m_mutex);
return m_isOnLine;
}
void setOnLine(bool);
blink::WebConnectionType connectionType() const
{
MutexLocker locker(m_mutex);
return m_type;
}
void setWebConnectionType(blink::WebConnectionType);
// Must be called on the context's thread. An added observer must be removed
// before its ExecutionContext is deleted. It's possible for an observer to
// be called twice for the same event if it is first removed and then added
// during notification.
void addObserver(NetworkStateObserver*, ExecutionContext*);
void removeObserver(NetworkStateObserver*, ExecutionContext*);
// The following functions are for testing purposes.
// When true, setWebConnectionType calls are ignored and only setWebConnectionTypeForTest
// can update the connection type. This is used for layout tests (see crbug.com/377736).
void setTestUpdatesOnly(bool);
// Tests should call this as it will change the type regardless of the value of m_testUpdatesOnly.
void setWebConnectionTypeForTest(blink::WebConnectionType);
private:
struct ObserverList {
ObserverList()
: iterating(false)
{
}
bool iterating;
Vector<NetworkStateObserver*> observers;
Vector<size_t> zeroedObservers; // Indices in observers that are 0.
};
void setWebConnectionTypeImpl(blink::WebConnectionType);
using ObserverListMap = HashMap<ExecutionContext*, OwnPtr<ObserverList>>;
void notifyObserversOnContext(ExecutionContext*, blink::WebConnectionType);
ObserverList* lockAndFindObserverList(ExecutionContext*);
// Removed observers are nulled out in the list in case the list is being
// iterated over. Once done iterating, call this to clean up nulled
// observers.
void collectZeroedObservers(ObserverList*, ExecutionContext*);
mutable Mutex m_mutex;
bool m_isOnLine;
blink::WebConnectionType m_type;
ObserverListMap m_observers;
bool m_testUpdatesOnly;
};
NetworkStateNotifier& networkStateNotifier();
} // namespace blink
#endif // NetworkStateNotifier_h
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