UnrealEngineUWP/Engine/Source/Developer/TargetDeviceServices/Private/TargetDeviceProxyManager.h

// Copyright 1998-2017 Epic Games, Inc. All Rights Reserved.

#pragma once

#include "CoreMinimal.h"
#include "Interfaces/ITargetDeviceProxyManager.h"
#include "Containers/Ticker.h"
#include "Developer/TargetDeviceServices/Private/TargetDeviceProxy.h"

struct FTargetDeviceServicePong;

/**
 * Implements a class which locates devices based on criteria for use in the Launcher.
 */
class FTargetDeviceProxyManager
	: public ITargetDeviceProxyManager
{
public:

	/** Default constructor. */
	FTargetDeviceProxyManager();

	/** Destructor. */
	virtual ~FTargetDeviceProxyManager();

public:

	// ITargetDeviceProxyLocator interface

	virtual ITargetDeviceProxyRef FindOrAddProxy(const FString& Name) override;
	virtual ITargetDeviceProxyPtr FindProxy(const FString& Name) override;
	
	virtual ITargetDeviceProxyPtr FindProxyDeviceForTargetDevice(const FString& DeviceId) override;
	
	virtual void GetProxies(FName TargetPlatformName, bool IncludeUnshared, TArray<ITargetDeviceProxyPtr>& OutProxies) override;

	DECLARE_DERIVED_EVENT(FTargetDeviceProxyManager, ITargetDeviceProxyManager::FOnTargetDeviceProxyAdded, FOnTargetDeviceProxyAdded);
	virtual FOnTargetDeviceProxyAdded& OnProxyAdded() override
	{
		return ProxyAddedDelegate;
	}

	DECLARE_DERIVED_EVENT(FTargetDeviceProxyManager, ITargetDeviceProxyManager::FOnTargetDeviceProxyRemoved, FOnTargetDeviceProxyRemoved);
	virtual FOnTargetDeviceProxyRemoved& OnProxyRemoved() override
	{
		return ProxyRemovedDelegate;
	}

protected:

	/** Removes all target device proxies that timed out. */
	void RemoveDeadProxies();

	/** Pings all target devices on the network. */
	void SendPing();

private:
	
	/** Handles FTargetDeviceServicePong messages. */
	void HandlePongMessage(const FTargetDeviceServicePong& Message, const IMessageContextRef& Context);

	/** Handles ticks from the ticker. */
	bool HandleTicker(float DeltaTime);

private:

	/** Holds the message endpoint. */
	FMessageEndpointPtr MessageEndpoint;

	/** Holds the collection of proxies. */
	TMap<FString, FTargetDeviceProxyPtr> Proxies;

private:

	/** Holds a delegate that is invoked when a target device proxy has been added. */
	FOnTargetDeviceProxyAdded ProxyAddedDelegate;

	/** Holds a delegate that is invoked when a target device proxy has been removed. */
	FOnTargetDeviceProxyRemoved ProxyRemovedDelegate;

	/** Holds a delegate to be invoked when the widget ticks. */
	FTickerDelegate TickDelegate;

	/** Handle to the registered TickDelegate. */
	FDelegateHandle TickDelegateHandle;
};