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// Copyright 2014 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.
#ifndef NET_BASE_SDCH_OBSERVER_H_
#define NET_BASE_SDCH_OBSERVER_H_
#include <iosfwd>
#include <string>
#include "net/base/net_export.h"
class GURL;
namespace net {
class SdchManager;
// Observer interface for SDCH. Observers can register with
// the SdchManager to receive notifications of various SDCH events.
class NET_EXPORT SdchObserver {
public:
virtual ~SdchObserver();
// A dictionary has been added to the observed manager.
virtual void OnDictionaryAdded(const GURL& dictionary_url,
const std::string& server_hash) = 0;
// A dictionary has been removed from the observed manager. Note that this is
// not called when dictionaries are cleared, so observers that want to track
// the loaded dictionary set need to observe OnClearDictionaries as well.
virtual void OnDictionaryRemoved(const std::string& server_hash) = 0;
// TODO(rdsmith): Add signal that an Avail-Dictionary header was generated.
// Should be added if/when an observer wants to use it to fine-tune
// dictionary deprecation (e.g. if Avail-Dictionary is generated and
// the remote *doesn't* use it, that should deprecate the dictionary faster)
// A SDCH encoded response was received and the specified dictionary
// was used to decode it. This notification only occurs for successful
// decodes. Note that this notification may occur for dictionaries that
// have been deleted from the SdchManager, since DictionarySets retain
// references to deleted dictionaries. Observers must handle this case.
// TODO(rdsmith): Should this notification indicate how much
// compression the dictionary provided?
virtual void OnDictionaryUsed(const std::string& server_hash) = 0;
// A "Get-Dictionary" header has been seen.
virtual void OnGetDictionary(const GURL& request_url,
const GURL& dictionary_url) = 0;
// Notification that SDCH has received a request to clear all
// its dictionaries.
virtual void OnClearDictionaries() = 0;
};
} // namespace net
#endif // NET_BASE_SDCH_MANAGER_H_
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