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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_RESOURCE_FINISH_OBSERVER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_RESOURCE_FINISH_OBSERVER_H_
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
// ResourceFinishObserver is different from ResourceClient in several ways.
// - NotifyFinished is dispatched asynchronously.
// - ResourceFinishObservers will be removed from Resource when the load
// finishes.
// - This class is not intended to be "subclassed" per each Resource subclass.
// There is no ImageResourceFinishObserver, for example.
// ResourceFinishObserver should be quite simple. All notifications must be
// notified AFTER the loading finishes.
class PLATFORM_EXPORT ResourceFinishObserver
: public GarbageCollected<ResourceFinishObserver> {
public:
virtual ~ResourceFinishObserver() = default;
// Called asynchronously when loading finishes.
// Note that this can be dispatched after removing |this| client from a
// Resource, because of the asynchronicity.
virtual void NotifyFinished() = 0;
// Name for debugging
virtual String DebugName() const = 0;
virtual void Trace(Visitor* visitor) const {}
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_RESOURCE_FINISH_OBSERVER_H_
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