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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 COMPONENTS_INVALIDATION_GCM_NETWORK_CHANNEL_DELEGATE_H_
#define COMPONENTS_INVALIDATION_GCM_NETWORK_CHANNEL_DELEGATE_H_
#include <string>
#include "base/callback.h"
#include "components/gcm_driver/gcm_client.h"
class GoogleServiceAuthError;
namespace syncer {
// Delegate for GCMNetworkChannel.
// GCMNetworkChannel needs Register to register with GCM client and obtain gcm
// registration id. This id is used for building URL to cache invalidation
// endpoint.
// It needs RequestToken and InvalidateToken to get access token to include it
// in HTTP message to server.
// GCMNetworkChannel lives on IO thread therefore calls will be made on IO
// thread and callbacks should be invoked there as well.
class GCMNetworkChannelDelegate {
public:
typedef base::Callback<void(const GoogleServiceAuthError& error,
const std::string& token)> RequestTokenCallback;
typedef base::Callback<void(const std::string& registration_id,
gcm::GCMClient::Result result)> RegisterCallback;
typedef base::Callback<void(const std::string& message,
const std::string& echo_token)> MessageCallback;
typedef base::Callback<void(bool online)> ConnectionStateCallback;
virtual ~GCMNetworkChannelDelegate() {}
virtual void Initialize(ConnectionStateCallback callback) = 0;
// Request access token. Callback should be called either with access token or
// error code.
virtual void RequestToken(RequestTokenCallback callback) = 0;
// Invalidate access token that was rejected by server.
virtual void InvalidateToken(const std::string& token) = 0;
// Request registration_id from GCMService. Callback should be called with
// either registration id or error code.
virtual void Register(RegisterCallback callback) = 0;
// Provide callback for incoming messages from GCM.
virtual void SetMessageReceiver(MessageCallback callback) = 0;
};
} // namespace syncer
#endif // COMPONENTS_INVALIDATION_GCM_NETWORK_CHANNEL_DELEGATE_H_
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