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SqMod/module/Misc/Signal.hpp
Sandu Liviu Catalin 22a17fe3c4 Code cleanup. 
Get rid of ReleaseGently.
2020-04-27 13:10:54 +03:00

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#pragma once
// ------------------------------------------------------------------------------------------------
#include "Base/Shared.hpp"
// ------------------------------------------------------------------------------------------------
#include <vector>
#include <utility>
#include <algorithm>
#include <functional>
// ------------------------------------------------------------------------------------------------
namespace SqMod {
// ------------------------------------------------------------------------------------------------
struct Signal;
struct SignalWrapper;
/* ------------------------------------------------------------------------------------------------
* Class used to deliver events to one or more listeners.
*/
struct Signal
{
friend class SignalWrapper;
// --------------------------------------------------------------------------------------------
typedef unsigned int SizeType; // Type of value used to represent sizes and/or indexes.
// --------------------------------------------------------------------------------------------
enum { SMB_SIZE = 8 };
/* --------------------------------------------------------------------------------------------
* Default constructor.
*/
Signal();
/* --------------------------------------------------------------------------------------------
* Default constructor.
*/
explicit Signal(const char * name)
: Signal(String(name))
{
//...
}
/* --------------------------------------------------------------------------------------------
* Default constructor.
*/
explicit Signal(const String & name)
: Signal(String(name))
{
//...
}
/* --------------------------------------------------------------------------------------------
* Default constructor.
*/
explicit Signal(String && name);
/* --------------------------------------------------------------------------------------------
* Copy constructor (disabled).
*/
Signal(const Signal & o) = delete;
/* --------------------------------------------------------------------------------------------
* Move constructor (disabled).
*/
Signal(Signal && o) = delete;
/* --------------------------------------------------------------------------------------------
* Destructor.
*/
~Signal();
/* --------------------------------------------------------------------------------------------
* Copy assignment operator (disabled).
*/
Signal & operator = (const Signal & o) = delete;
/* --------------------------------------------------------------------------------------------
* Move assignment operator (disabled).
*/
Signal & operator = (Signal && o) = delete;
protected:
/* --------------------------------------------------------------------------------------------
* Adjust the internal buffer size if necessary.
*/
bool AdjustSlots(SizeType capacity);
/* --------------------------------------------------------------------------------------------
* Structure responsible for storing information about a slot.
*/
struct Slot {
SQHash mThisHash; // The hash of the specified environment.
SQHash mFuncHash; // The hash of the specified callback.
HSQOBJECT mThisRef; // The specified script environment.
HSQOBJECT mFuncRef; // The specified script callback.
/* ----------------------------------------------------------------------------------------
* Default constructor.
*/
Slot()
: mThisHash(0)
, mFuncHash(0)
, mThisRef()
, mFuncRef()
{
sq_resetobject(&mThisRef);
sq_resetobject(&mFuncRef);
}
/* ----------------------------------------------------------------------------------------
* Forwarding constructor.
*/
Slot(Object & env, ::Sqrat::Function & func)
: Slot(env.GetObj(), func.GetFunc())
{
/* ... */
}
/* ----------------------------------------------------------------------------------------
* Base constructor.
*/
Slot(HSQOBJECT & env, HSQOBJECT & func)
: mThisHash(0)
, mFuncHash(0)
, mThisRef(env)
, mFuncRef(func)
{
HSQUIRRELVM vm = SqVM();
// Remember the current stack size
const StackGuard sg(vm);
// Is there an explicit environment?
if (!sq_isnull(mThisRef))
{
// Keep a reference to this environment
sq_addref(vm, &mThisRef);
// Push the environment on the stack
sq_pushobject(vm, mThisRef);
// Grab the hash of the environment object
mThisHash = sq_gethash(vm, -1);
}
// Is there an explicit function?
if (!sq_isnull(mFuncRef))
{
// Keep a reference to this function
sq_addref(vm, &mFuncRef);
// Push the callback on the stack
sq_pushobject(vm, mFuncRef);
// Grab the hash of the callback object
mFuncHash = sq_gethash(vm, -1);
}
}
/* ----------------------------------------------------------------------------------------
* Base constructor.
*/
Slot(HSQOBJECT & env, HSQOBJECT & func, SQHash envh, SQHash funch)
: mThisHash(envh)
, mFuncHash(funch)
, mThisRef(env)
, mFuncRef(func)
{
}
/* ----------------------------------------------------------------------------------------
* Copy constructor.
*/
Slot(const Slot & o)
: mThisHash(o.mThisHash)
, mFuncHash(o.mFuncHash)
, mThisRef(o.mThisRef)
, mFuncRef(o.mFuncRef)
{
// Track reference
if (mFuncHash != 0)
{
sq_addref(SqVM(), &mThisRef);
sq_addref(SqVM(), &mFuncRef);
}
}
/* ----------------------------------------------------------------------------------------
* Move constructor.
*/
Slot(Slot && o) noexcept
: mThisHash(o.mThisHash)
, mFuncHash(o.mFuncHash)
, mThisRef(o.mThisRef)
, mFuncRef(o.mFuncRef)
{
// Take ownership
sq_resetobject(&o.mThisRef);
sq_resetobject(&o.mFuncRef);
}
/* ----------------------------------------------------------------------------------------
* Destructor.
*/
~Slot()
{
Release();
}
/* ----------------------------------------------------------------------------------------
* Copy assignment operator. (disabled)
*/
Slot & operator = (const Slot & o)
{
if (this != &o)
{
// Release current resources, if any
Release();
// Replicate data
mThisHash = o.mThisHash;
mFuncHash = o.mFuncHash;
mThisRef = o.mThisRef;
mFuncRef = o.mFuncRef;
// Track reference
sq_addref(SqVM(), &const_cast< HSQOBJECT & >(o.mThisRef));
sq_addref(SqVM(), &const_cast< HSQOBJECT & >(o.mFuncRef));
}
return *this;
}
/* ----------------------------------------------------------------------------------------
* Move assignment operator.
*/
Slot & operator = (Slot && o) noexcept
{
if (this != &o)
{
// Release current resources, if any
Release();
// Replicate data
mThisHash = o.mThisHash;
mFuncHash = o.mFuncHash;
mThisRef = o.mThisRef;
mFuncRef = o.mFuncRef;
// Take ownership
sq_resetobject(&o.mThisRef);
sq_resetobject(&o.mFuncRef);
}
return *this;
}
/* ----------------------------------------------------------------------------------------
* Equality comparison operator.
*/
bool operator == (const Slot & o) const
{
return (mThisHash == o.mThisHash) && (mFuncHash == o.mFuncHash);
}
/* ----------------------------------------------------------------------------------------
* Inequality comparison operator.
*/
bool operator != (const Slot & o) const
{
return (mThisHash != o.mThisHash) || (mFuncHash != o.mFuncHash);
}
/* ----------------------------------------------------------------------------------------
* Release managed script resources.
*/
bool Available() const
{
return (mFuncHash == 0);
}
/* ----------------------------------------------------------------------------------------
* Release managed script resources.
*/
void Release()
{
// Should we release any environment object?
if (mThisHash != 0)
{
sq_release(SqVM(), &mThisRef);
sq_resetobject(&mThisRef);
// Also reset the hash
mThisHash = 0;
}
// Should we release any callback object?
if (mFuncHash != 0)
{
sq_release(SqVM(), &mFuncRef);
sq_resetobject(&mFuncRef);
// Also reset the hash
mFuncHash = 0;
}
}
/* ----------------------------------------------------------------------------------------
* Swap the values of two slots.
*/
void Swap(Slot & s)
{
// Swap the environment hash
SQHash h = mThisHash;
mThisHash = s.mThisHash;
s.mThisHash = h;
// Swap the callback hash
h = mFuncHash;
mFuncHash = s.mFuncHash;
s.mFuncHash = h;
// Swap the environment object
HSQOBJECT o = mThisRef;
mThisRef = s.mThisRef;
s.mThisRef = o;
// Swap the callback object
o = mFuncRef;
mFuncRef = s.mFuncRef;
s.mFuncRef = o;
}
};
// --------------------------------------------------------------------------------------------
typedef Slot ValueType; // Value type used to represent a slot.
typedef ValueType & Reference; // Reference to the stored value type
typedef const ValueType & ConstReference; // Constant reference to the stored value type.
typedef ValueType * Pointer; // Pointer to the stored value type
typedef const ValueType * ConstPointer; // Constant pointer to the stored value type.
// --------------------------------------------------------------------------------------------
/// Execution scope used to adjust iterators when removing slots or adjusting the buffer.
struct Scope {
// ----------------------------------------------------------------------------------------
Pointer mItr; ///< Currently executed slot.
Pointer mEnd; ///< Where the execution ends.
Scope * mParent; ///< Previous execution scope.
Scope * mChild; ///< Next execution scope.
// ----------------------------------------------------------------------------------------
/// Default constructor.
Scope(Scope * parent, Pointer begin, Pointer end)
: mItr(begin), mEnd(end), mParent(parent), mChild(nullptr)
{
if (mParent != nullptr) mParent->mChild = this;
}
// ----------------------------------------------------------------------------------------
/// Destructor.
~Scope() {
if (mParent != nullptr) mParent->mChild = nullptr;
}
// ----------------------------------------------------------------------------------------
/// Adjust the iterators to account for the fact that the specified slot was removed.
void Descend(Pointer ptr);
/// Adjust the iterators to account for the fact that the specified slot is now leading.
void Lead(Pointer ptr);
/// Adjust the iterators to account for the fact that the specified slot is now tailing.
void Tail(Pointer ptr);
/// Adjust the iterators to finish the execution abruptly.
void Finish();
};
private:
// --------------------------------------------------------------------------------------------
SizeType m_Used; // The number of stored slots that are valid.
SizeType m_Size; // The size of the memory allocated for slots.
Pointer m_Slots; // Pointer to the memory containing the slots.
// --------------------------------------------------------------------------------------------
Scope * m_Scope; // Current execution state.
// --------------------------------------------------------------------------------------------
String m_Name; // The name that identifies this signal.
LightObj m_Data; // User data associated with this instance.
// --------------------------------------------------------------------------------------------
ValueType m_SMB[SMB_SIZE]{}; // Small buffer optimization.
public:
/* --------------------------------------------------------------------------------------------
* Used by the script engine to convert an instance of this type to a string.
*/
const String & ToString() const
{
return m_Name;
}
/* --------------------------------------------------------------------------------------------
* Retrieve the associated user data.
*/
LightObj & GetData()
{
return m_Data;
}
/* --------------------------------------------------------------------------------------------
* Modify the associated user data.
*/
void SetData(LightObj & data)
{
m_Data = data;
}
/* --------------------------------------------------------------------------------------------
* The number of slots connected to the signal.
*/
SQInteger GetUsed() const
{
return static_cast< SQInteger >(m_Used);
}
/* --------------------------------------------------------------------------------------------
* Clear all slots connected to the signal.
*/
void ClearSlots();
/* --------------------------------------------------------------------------------------------
* See if there are any slots connected.
*/
bool IsEmpty() const
{
return (m_Used == 0);
}
protected:
/* --------------------------------------------------------------------------------------------
* Connect the specified slot to the signal.
*/
SQInteger Connect(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* Connect the specified slot but not before disconnecting all other occurrences.
*/
SQInteger ConnectOnce(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* Disconnect all occurrences of the specified slot from the signal.
*/
SQInteger Disconnect(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* See if the specified slot is connected to the signal.
*/
SQInteger Exists(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* See if the specified slot environment is connected to the signal.
*/
SQInteger ExistsThis(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* See if the specified slot callback is connected to the signal.
*/
SQInteger ExistsFunc(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* Count all occurrences of the specified slot.
*/
SQInteger Count(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* Count all occurrences of the specified slot environment.
*/
SQInteger CountThis(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* Count all occurrences of the specified slot callback.
*/
SQInteger CountFunc(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* Move all occurrences of the specified slot to the front.
*/
SQInteger Lead(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* Move all occurrences of the specified slot environment to the front.
*/
SQInteger LeadThis(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* Move all occurrences of the specified slot callback to the front.
*/
SQInteger LeadFunc(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* Move all occurrences of the specified slot to the back.
*/
SQInteger Tail(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* Move all occurrences of the specified slot environment to the back.
*/
SQInteger TailThis(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* Move all occurrences of the specified slot callback to the back.
*/
SQInteger TailFunc(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* Remove all occurrences of the specified slot.
*/
SQInteger Eliminate(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* Remove all occurrences of the specified slot environment.
*/
SQInteger EliminateThis(SignalWrapper & w);
/* --------------------------------------------------------------------------------------------
* Remove all occurrences of the specified slot callback.
*/
SQInteger EliminateFunc(SignalWrapper & w);
public:
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `Connect` method of this class.
*/
static SQInteger SqConnect(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `ConnectOnce` method of this class.
*/
static SQInteger SqConnectOnce(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `Exists` method of this class.
*/
static SQInteger SqExists(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `Disconnect` method of this class.
*/
static SQInteger SqDisconnect(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `ExistsThis` method of this class.
*/
static SQInteger SqExistsThis(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `ExistsFunc` method of this class.
*/
static SQInteger SqExistsFunc(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `Count` method of this class.
*/
static SQInteger SqCount(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `CountThis` method of this class.
*/
static SQInteger SqCountThis(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `CountFunc` method of this class.
*/
static SQInteger SqCountFunc(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `Lead` method of this class.
*/
static SQInteger SqLead(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `LeadThis` method of this class.
*/
static SQInteger SqLeadThis(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `LeadFunc` method of this class.
*/
static SQInteger SqLeadFunc(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `Tail` method of this class.
*/
static SQInteger SqTail(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `TailThis` method of this class.
*/
static SQInteger SqTailThis(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `TailFunc` method of this class.
*/
static SQInteger SqTailFunc(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `Eliminate` method of this class.
*/
static SQInteger SqEliminate(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `EliminateThis` method of this class.
*/
static SQInteger SqEliminateThis(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `EliminateFunc` method of this class.
*/
static SQInteger SqEliminateFunc(HSQUIRRELVM vm);
protected:
/* --------------------------------------------------------------------------------------------
* Emit the event to the connected slots.
*/
SQInteger Emit(HSQUIRRELVM vm, SQInteger top);
/* --------------------------------------------------------------------------------------------
* Emit the event to the connected slots and collect returned values.
*/
SQInteger Query(HSQUIRRELVM vm, SQInteger top);
/* --------------------------------------------------------------------------------------------
* Emit the event to the connected slots and see if they consume it.
*/
SQInteger Consume(HSQUIRRELVM vm, SQInteger top);
/* --------------------------------------------------------------------------------------------
* Emit the event to the connected slots and see if they approve it.
*/
SQInteger Approve(HSQUIRRELVM vm, SQInteger top);
/* --------------------------------------------------------------------------------------------
* Emit the event to the connected slots and see if they return something.
*/
SQInteger Request(HSQUIRRELVM vm, SQInteger top);
public:
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `Emit` method of this class.
*/
static SQInteger SqEmit(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `Query` method of this class.
*/
static SQInteger SqQuery(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `Consume` method of this class.
*/
static SQInteger SqConsume(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `Approve` method of this class.
*/
static SQInteger SqApprove(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Squirrel wrapper for the `Request` method of this class.
*/
static SQInteger SqRequest(HSQUIRRELVM vm);
protected:
// --------------------------------------------------------------------------------------------
typedef std::pair< std::size_t, SignalPair > SignalElement;
typedef std::vector< SignalElement > SignalPool;
typedef std::vector< Signal * > FreeSignals;
// --------------------------------------------------------------------------------------------
static SignalPool s_Signals; // List of all created signals.
static FreeSignals s_FreeSignals; // List of signals without a name.
#pragma clang diagnostic push
#pragma ide diagnostic ignored "MemberFunctionCanBeStatic"
/* --------------------------------------------------------------------------------------------
* Specialization for when there are no arguments given.
*/
void PushParameters()
{
//...
}
#pragma clang diagnostic pop
/* --------------------------------------------------------------------------------------------
* Specialization for when there's only one argument given/remaining.
*/
template < typename T > void PushParameters(T v)
{
Var< T >::push(SqVM(), v);
}
/* --------------------------------------------------------------------------------------------
* Specialization for when there's more than one argument given.
*/
template < typename T, typename... Args > void PushParameters(T v, Args... args)
{
Var< T >::push(SqVM(), v);
PushParameters(args...);
}
public:
/* --------------------------------------------------------------------------------------------
* Terminate all signal instances and release any script resources.
*/
static void Terminate();
/* --------------------------------------------------------------------------------------------
* Create a free signal without a specific name.
*/
static LightObj CreateFree();
/* --------------------------------------------------------------------------------------------
* Create a new signal with the specified name.
*/
static LightObj Create(StackStrF & name);
/* --------------------------------------------------------------------------------------------
* Remove the signal with the specified name.
*/
static void Remove(StackStrF & name);
/* --------------------------------------------------------------------------------------------
* Retrieve the signal with the specified name.
*/
static const LightObj & Fetch(StackStrF & name);
/* --------------------------------------------------------------------------------------------
* Emit a signal from the module.
*/
template < typename... Args > void operator () (Args&&... args)
{
// Are there any slots connected?
if (!m_Used) return;
// Enter a new execution scope
Scope scope(m_Scope, m_Slots, m_Slots + m_Used);
// Activate the current scope and create a guard to restore it
const AutoAssign< Scope * > aa(m_Scope, scope.mParent, &scope);
// Grab the default virtual machine
HSQUIRRELVM vm = SqVM();
// Process the slots from this scope
while (scope.mItr != scope.mEnd)
{
// Grab a reference to the current slot
const Slot & slot = *(scope.mItr++);
// Push the callback object
sq_pushobject(vm, slot.mFuncRef);
// Is there an explicit environment?
if (slot.mThisHash == 0)
{
sq_pushroottable(vm);
}
else
{
sq_pushobject(vm, slot.mThisRef);
}
// Push the given parameters on the stack
PushParameters(args...);
// Make the function call and store the result
const SQRESULT res = sq_call(vm, 1 + sizeof...(Args), static_cast< SQBool >(false), static_cast< SQBool >(ErrorHandling::IsEnabled()));
// Pop the callback object from the stack
sq_pop(vm, 1);
// Validate the result
if (SQ_FAILED(res))
{
SQTHROW(vm, LastErrorString(vm)); // Stop emitting signals NOLINT(hicpp-exception-baseclass,cert-err60-cpp)
}
}
}
};
} // Namespace:: SqMod
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