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/*
* Copyright (C) 2005-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#pragma once
#include "AddonClass.h"
#include "CallbackHandler.h"
#include "threads/Event.h"
/**
* This class is an interface that can be used to define programming language
* specific hooks.
*/
class IPlayerCallback;
namespace XBMCAddon
{
namespace xbmc
{
class Monitor;
}
class LanguageHook : public AddonClass
{
protected:
inline LanguageHook() = default;
public:
~LanguageHook() override;
/**
* If the scripting language needs special handling for calls
* that block or are delayed in any other means, this should
* be overloaded.
*
* In Python when control is passed to a native
* method that blocks, you need to allow other threads in
* Python to run by using Py_BEGIN_ALLOW_THREADS. This is
* the place to put that functionality
*/
virtual void DelayedCallOpen() { }
/**
* If the scripting language needs special handling for calls
* that block or are delayed in any other means, this should
* be overloaded.
*
* In Python when control is passed to a native
* method that blocks, you need to allow other threads in
* Python to run by using Py_BEGIN_ALLOW_THREADS. When that
* delayed method ends you need to restore the Python thread
* state using Py_END_ALLOW_THREADS. This is the place to put
* that functionality
*/
virtual void DelayedCallClose() { }
virtual void MakePendingCalls() {}
/**
* For scripting languages that need a global callback handler, this
* method should be overloaded to supply one.
*/
virtual CallbackHandler* GetCallbackHandler() { return NULL; }
/**
* This is a callback method that can be overridden to receive a callback
* when an AddonClass that has this language hook is on is being constructed.
* It is called from the constructor of AddonClass so the implementor
* cannot assume the subclasses have been built or that calling a
* virtual function on the AddonClass will work as expected.
*/
virtual void Constructing(AddonClass* beingConstructed) { }
/**
* This is a callback method that can be overridden to receive a callback
* when an AddonClass that has this language hook is on is being destructed.
* It is called from the destructor of AddonClass so the implementor
* should assume the subclasses have been torn down and that calling a
* virtual function on the AddonClass will not work as expected.
*/
virtual void Destructing(AddonClass* beingDestructed) { }
/**
* This method should be done a different way but since the only other way
* I can think to do it requires an InheritableThreadLocal C++ equivalent,
* I'm going to defer to this technique for now.
*
* Currently (for python) the scripting language has the Addon id injected
* into it as a global variable. Therefore the only way to retrieve it is
* to use scripting language specific calls. So until I figure out a
* better way to do this, this is how I need to retrieve it.
*/
virtual String GetAddonId() { return emptyString; }
virtual String GetAddonVersion() { return emptyString; }
virtual long GetInvokerId() { return -1; }
virtual void RegisterPlayerCallback(IPlayerCallback* player) = 0;
virtual void UnregisterPlayerCallback(IPlayerCallback* player) = 0;
virtual void RegisterMonitorCallback(XBMCAddon::xbmc::Monitor* player) = 0;
virtual void UnregisterMonitorCallback(XBMCAddon::xbmc::Monitor* player) = 0;
virtual bool WaitForEvent(CEvent& hEvent, unsigned int milliseconds) = 0;
static void SetLanguageHook(LanguageHook* languageHook);
static LanguageHook* GetLanguageHook();
static void ClearLanguageHook();
};
/**
* This class can be used to access the language hook's DelayedCallOpen
* and DelayedCallClose. It should be used whenever an API method
* is written such that it can block for an indefinite amount of time
* since certain scripting languages (like Python) need to do extra
* work for delayed calls (like free the python locks and handle
* callbacks).
*/
class DelayedCallGuard
{
LanguageHook* languageHook;
bool clearOnExit = false;
public:
inline explicit DelayedCallGuard(LanguageHook* languageHook_) : languageHook(languageHook_)
{ if (languageHook) languageHook->DelayedCallOpen(); }
inline DelayedCallGuard() : languageHook(LanguageHook::GetLanguageHook())
{ if (languageHook) languageHook->DelayedCallOpen(); }
inline ~DelayedCallGuard()
{
if (clearOnExit) LanguageHook::ClearLanguageHook();
if (languageHook) languageHook->DelayedCallClose();
}
inline LanguageHook* getLanguageHook() { return languageHook; }
};
class SetLanguageHookGuard
{
public:
inline explicit SetLanguageHookGuard(LanguageHook* languageHook) { LanguageHook::SetLanguageHook(languageHook); }
inline ~SetLanguageHookGuard() { LanguageHook::ClearLanguageHook(); }
};
}
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