channelrepository.h

Go to the documentation of this file.

/********************************************************************************************
* Twitch Broadcasting SDK
*
* This software is supplied under the terms of a license agreement with Twitch Interactive, Inc. and
* may not be copied or used except in accordance with the terms of that agreement
* Copyright (c) 2012-2016 Twitch Interactive, Inc.
*********************************************************************************************/

#pragma once

#include "twitchsdk/core/types/coretypes.h"
#include "twitchsdk/core/types/errortypes.h"
#include "twitchsdk/core/component.h"
#include "twitchsdk/core/cache.h"
#include "twitchsdk/core/mutex.h"

#include <memory>
#include <map>


namespace ttv
{
    class TaskRunner;
    class ChannelRepository;
    class GetChannelTask;
    struct ChannelInfo;
}


class ttv::ChannelRepository : public Component
{
public:
    typedef std::function<void(TTV_ErrorCode ec, const ChannelInfo& channelInfo)> LookupCallback;

public:
    ChannelRepository();
    
    TTV_ErrorCode FetchChannelInfo(ChannelId channelId, LookupCallback callback);
    TTV_ErrorCode GetChannelInfo(ChannelId channelId, ChannelInfo& result);
    TTV_ErrorCode CacheChannelInfo(const ChannelInfo& channelInfo);

    // Component overrides
    virtual void Update() override;
    virtual TTV_ErrorCode Shutdown() override;
    virtual std::string GetLoggerName() const override;
    

private:
    struct LookupEntry
    {
        ChannelId channelId;
        LookupCallback callback;
        std::shared_ptr<GetChannelTask> task;
    };

    // Component overrides
    virtual bool CheckShutdown() override;
    virtual void CompleteShutdown() override;

    TTV_ErrorCode ScheduleLookup();
    void CompleteLookup(ChannelId channelId, const ChannelInfo& channelInfo, TTV_ErrorCode ec);
    
    std::shared_ptr<ttv::IMutex> mMutex;
    Cache<ChannelId, ChannelInfo> mChannelInfoCache;
    std::vector<LookupEntry> mPendingChannelInfoLookups;

    bool mLookupInProgress;
};