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SqMod/source/Misc/Signal.hpp

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#ifndef _MISC_SIGNAL_HPP_
#define _MISC_SIGNAL_HPP_
// ------------------------------------------------------------------------------------------------
#include "Base/Shared.hpp"
// ------------------------------------------------------------------------------------------------
#include <vector>
#include <utility>
#include <algorithm>
#include <functional>
// ------------------------------------------------------------------------------------------------
namespace SqMod {
// ------------------------------------------------------------------------------------------------
class Signal;
/* ------------------------------------------------------------------------------------------------
* Helper class used to reference and keep track of signal instances.
*/
struct SignalReference
{
// --------------------------------------------------------------------------------------------
Signal * mPtr; // A raw pointer to the signal instance.
Object mObj; // A managed reference to the signal instance.
/* --------------------------------------------------------------------------------------------
* Explicit constructor.
*/
SignalReference(Signal * ptr, const Object & ref)
: mPtr(ptr), mObj(ref)
{
/* ... */
}
/* --------------------------------------------------------------------------------------------
* Copy constructor.
*/
SignalReference(const SignalReference & o) = default;
/* --------------------------------------------------------------------------------------------
* Move constructor.
*/
SignalReference(SignalReference && o) = default;
/* --------------------------------------------------------------------------------------------
* Destructor.
*/
~SignalReference() = default;
/* --------------------------------------------------------------------------------------------
* Copy assignment operator.
*/
SignalReference & operator = (const SignalReference & o) = default;
/* --------------------------------------------------------------------------------------------
* Move assignment operator.
*/
SignalReference & operator = (SignalReference && o) = default;
};
/* ------------------------------------------------------------------------------------------------
* Utility class for for delivering events to one or more listeners.
*/
class Signal
{
private:
/* --------------------------------------------------------------------------------------------
* Used to store a script callback and the unique hash associated with it for quick searching.
*/
struct Slot
{
// ----------------------------------------------------------------------------------------
SQHash mEnvHash; // The hash of the specified environment.
SQHash mFuncHash; // The hash of the specified callback.
HSQOBJECT mEnvRef; // The specified script environment.
HSQOBJECT mFuncRef; // The specified script callback.
// ----------------------------------------------------------------------------------------
Slot * mPrev; // Previous slot in the chain.
Slot * mNext; // Next slot in the chain.
/* ----------------------------------------------------------------------------------------
* Forwarding constructor.
*/
Slot(Object & env, Function & func)
: Slot(env.GetObject(), func.GetFunc(), nullptr)
{
/* ... */
}
/* ----------------------------------------------------------------------------------------
* Forwarding constructor.
*/
Slot(Object & env, Function & func, Slot * head)
: Slot(env.GetObject(), func.GetFunc(), head)
{
/* ... */
}
/* ----------------------------------------------------------------------------------------
* Base constructor.
*/
Slot(HSQOBJECT & env, HSQOBJECT & func, Slot * head)
: mEnvHash(0)
, mFuncHash(0)
, mEnvRef(env)
, mFuncRef(func)
, mPrev(nullptr)
, mNext(head)
{
HSQUIRRELVM vm = DefaultVM::Get();
// Remember the current stack size
const StackGuard sg(vm);
// Is there an explicit environment?
if (!sq_isnull(mEnvRef))
{
// Keep a reference to this environment
sq_addref(vm, &mEnvRef);
// Push the environment on the stack
sq_pushobject(vm, mEnvRef);
// Grab the hash of the environment object
mEnvHash = 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);
}
// Was there a previous head?
if (mNext != nullptr)
{
// Steal the slot before the head
mPrev = mNext->mPrev;
// Did that head slot had a slot behind it?
if (mPrev != nullptr)
{
// Tell it we're the next slot now
mPrev->mNext = this;
}
// Tell the previous head that we're behind it now
mNext->mPrev = this;
}
}
/* ----------------------------------------------------------------------------------------
* Copy constructor. (disabled)
*/
Slot(const Slot & o) = delete;
/* ----------------------------------------------------------------------------------------
* Move constructor.
*/
Slot(Slot && o)
: mEnvHash(o.mEnvHash)
, mFuncHash(o.mFuncHash)
, mEnvRef(o.mEnvRef)
, mFuncRef(o.mFuncRef)
, mPrev(o.mPrev)
, mNext(o.mNext)
{
// Take ownership
sq_resetobject(&o.mEnvRef);
sq_resetobject(&o.mFuncRef);
o.mPrev = nullptr;
o.mNext = nullptr;
// Attach to the chain
Attach();
}
/* ----------------------------------------------------------------------------------------
* Destructor.
*/
~Slot()
{
Release();
// Detach from the chain
Detach();
}
/* ----------------------------------------------------------------------------------------
* Copy assignment operator. (disabled)
*/
Slot & operator = (const Slot & o) = delete;
/* ----------------------------------------------------------------------------------------
* Move assignment operator.
*/
Slot & operator = (Slot && o)
{
if (this != &o)
{
// Release current resources, if any
Release();
// Replicate data
mEnvHash = o.mEnvHash;
mFuncHash = o.mFuncHash;
mEnvRef = o.mEnvRef;
mFuncRef = o.mFuncRef;
mPrev = o.mPrev;
mNext = o.mNext;
// Take ownership
sq_resetobject(&o.mEnvRef);
sq_resetobject(&o.mFuncRef);
o.mPrev = nullptr;
o.mNext = nullptr;
// Attach to the chain
Attach();
}
return *this;
}
/* ----------------------------------------------------------------------------------------
* Equality comparison operator.
*/
bool operator == (const Slot & o) const
{
return (mEnvHash == o.mEnvHash) && (mFuncHash == o.mFuncHash);
}
/* ----------------------------------------------------------------------------------------
* Inequality comparison operator.
*/
bool operator != (const Slot & o) const
{
return (mEnvHash != o.mEnvHash) || (mFuncHash != o.mFuncHash);
}
/* ----------------------------------------------------------------------------------------
* Release managed script resources.
*/
void Release()
{
// Should we release any environment object?
if (!sq_isnull(mEnvRef))
{
sq_release(DefaultVM::Get(), &mEnvRef);
sq_resetobject(&mEnvRef);
}
// Should we release any callback object?
if (!sq_isnull(mFuncRef))
{
sq_release(DefaultVM::Get(), &mFuncRef);
sq_resetobject(&mFuncRef);
}
}
/* ----------------------------------------------------------------------------------------
* Attach the slot to the chain.
*/
void Attach()
{
// Is there a slot after us?
if (mNext != nullptr)
{
// Tell it that we're behind it
mNext->mPrev = this;
}
// Is there a node behind us?
if (mPrev != nullptr)
{
// Tell it that we're ahead of it
mPrev->mNext = this;
}
}
/* ----------------------------------------------------------------------------------------
* Detach the slot from the chain.
*/
void Detach()
{
// Is there a slot after us?
if (mNext != nullptr)
{
// Tell it we're no longer behind it
mNext->mPrev = mPrev;
}
// Is there a node behind us?
if (mPrev != nullptr)
{
// Tell it we're no longer ahead of it
mPrev->mNext = mNext;
}
mPrev = mNext = nullptr;
}
/* ----------------------------------------------------------------------------------------
* Attach the slot after another slot.
*/
void AttachNext(Slot * node)
{
Detach();
// Assign the slot ahead of us
mNext = node;
// Is there a node to attach to?
if (mNext != nullptr)
{
// Steal the previous slot
mPrev = mNext->mPrev;
// Was there a previous slot?
if (mPrev != nullptr)
{
mPrev->mNext = this; // Tell it we're the next slot now
}
// Place ourself behind
mNext->mPrev = this;
}
}
/* ----------------------------------------------------------------------------------------
* Attach the slot before another slot.
*/
void AttachPrev(Slot * node)
{
Detach();
// Assign the slot behind us
mPrev = node;
// Is there a node to attach to?
if (mPrev != nullptr)
{
// Steal the next slot
mNext = mPrev->mNext;
// Was there a next slot?
if (mNext != nullptr)
{
mNext->mPrev = this; // Tell it we're the previous slot now
}
// Place ourself ahead
mPrev->mNext = this;
}
}
};
// --------------------------------------------------------------------------------------------
Slot * m_Head; // The chain of slots bound to this signal.
Object m_Data; // User data associated with this instance.
String m_Name; // The name that identifies this signal.
/* --------------------------------------------------------------------------------------------
* Default constructor.
*/
Signal();
/* --------------------------------------------------------------------------------------------
* Base constructor.
*/
explicit Signal(const CSStr name);
/* --------------------------------------------------------------------------------------------
* Base constructor.
*/
Signal(const String & name);
/* --------------------------------------------------------------------------------------------
* Base constructor.
*/
Signal(String && name);
public:
/* --------------------------------------------------------------------------------------------
* 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;
/* --------------------------------------------------------------------------------------------
* 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.
*/
Object & GetData()
{
return m_Data;
}
/* --------------------------------------------------------------------------------------------
* Modify the associated user data.
*/
void SetData(Object & data)
{
m_Data = data;
}
/* --------------------------------------------------------------------------------------------
* The number of slots connected to the signal.
*/
SQInteger Count() const;
/* --------------------------------------------------------------------------------------------
* Clear all slots connected to the signal.
*/
void Clear();
/* --------------------------------------------------------------------------------------------
* Connect a function with a specific environment to the signal.
*/
void Connect(Object & env, Function & func);
/* --------------------------------------------------------------------------------------------
* See whether a function with a specific environment is connected to the signal.
*/
bool Connected(Object & env, Function & func) const;
/* --------------------------------------------------------------------------------------------
* Disconnect a function with a specific environment from the signal.
*/
void Disconnect(Object & env, Function & func);
/* --------------------------------------------------------------------------------------------
* Disconnect all functions with a specific environment from the signal.
*/
void DisconnectThis(Object & env);
/* --------------------------------------------------------------------------------------------
* Disconnect all matching functions regardless of the environment from the signal.
*/
void DisconnectFunc(Function & func);
/* --------------------------------------------------------------------------------------------
* Count all functions with a specific environment from the signal.
*/
Uint32 CountThis(Object & env) const;
/* --------------------------------------------------------------------------------------------
* Count all matching functions regardless of the environment from the signal.
*/
Uint32 CountFunc(Function & func) const;
/* --------------------------------------------------------------------------------------------
* Make sure that specified slot is positioned ahead of all other slots.
*/
void Head(Object & env, Function & func);
/* --------------------------------------------------------------------------------------------
* Make sure that specified slot is positioned behind of all other slots.
*/
void Tail(Object & env, Function & func);
/* --------------------------------------------------------------------------------------------
* Emit the event to the connected slots.
*/
static SQInteger SqEmit(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Emit the event to the connected slots and collect returned values.
*/
static SQInteger SqQuery(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Emit the event to the connected slots and see if they consume it.
*/
static SQInteger SqConsume(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Emit the event to the connected slots and see if they approve it.
*/
static SQInteger SqApprove(HSQUIRRELVM vm);
/* --------------------------------------------------------------------------------------------
* Emit the event to the connected slots and see if they return something.
*/
static SQInteger SqRequest(HSQUIRRELVM vm);
private:
// --------------------------------------------------------------------------------------------
typedef std::pair< std::size_t, SignalReference > SignalElement;
typedef std::vector< SignalElement > SignalContainer;
typedef std::vector< Signal * > FreeSignals;
// --------------------------------------------------------------------------------------------
static SignalContainer s_Signals; // List of all created signals.
static FreeSignals s_FreeSignals; // List of signals without a name.
public:
/* --------------------------------------------------------------------------------------------
* Terminate all signal instances and release any script resources.
*/
static void Terminate();
/* --------------------------------------------------------------------------------------------
* Create a free signal without a specific name.
*/
static Object CreateFree();
/* --------------------------------------------------------------------------------------------
* Create a new signal with the specified name.
*/
static Object Create(StackStrF & name);
/* --------------------------------------------------------------------------------------------
* Remove the signal with the specified name.
*/
static void Remove(StackStrF & name);
/* --------------------------------------------------------------------------------------------
* Retrieve the signal with the specified name.
*/
static Object Fetch(StackStrF & name);
};
} // Namespace:: SqMod
#endif // _MISC_SIGNAL_HPP_
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