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SqMod/vendor/POCO/Foundation/include/Poco/ActiveMethod.h
Sandu Liviu Catalin 4a6bfc086c Major plugin refactor and cleanup.
Switched to POCO library for unified platform/library interface.
Deprecated the external module API. It was creating more problems than solving.
Removed most built-in libraries in favor of system libraries for easier maintenance.
Cleaned and secured code with help from static analyzers.
2021-01-30 08:51:39 +02:00

219 lines
5.8 KiB
C++

//
// ActiveMethod.h
//
// Library: Foundation
// Package: Threading
// Module: ActiveObjects
//
// Definition of the ActiveMethod class.
//
// Copyright (c) 2004-2007, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_ActiveMethod_INCLUDED
#define Foundation_ActiveMethod_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/ActiveResult.h"
#include "Poco/ActiveRunnable.h"
#include "Poco/ActiveStarter.h"
#include "Poco/AutoPtr.h"
namespace Poco {
template <class ResultType, class ArgType, class OwnerType, class StarterType = ActiveStarter<OwnerType>>
class ActiveMethod
/// An active method is a method that, when called, executes
/// in its own thread. ActiveMethod's take exactly one
/// argument and can return a value. To pass more than one
/// argument to the method, use a struct.
/// The following example shows how to add an ActiveMethod
/// to a class:
///
/// class ActiveObject
/// {
/// public:
/// ActiveObject():
/// exampleActiveMethod(this, &ActiveObject::exampleActiveMethodImpl)
/// {
/// }
///
/// ActiveMethod<std::string, std::string, ActiveObject> exampleActiveMethod;
///
/// protected:
/// std::string exampleActiveMethodImpl(const std::string& arg)
/// {
/// ...
/// }
/// };
///
/// And following is an example that shows how to invoke an ActiveMethod.
///
/// ActiveObject myActiveObject;
/// ActiveResult<std::string> result = myActiveObject.exampleActiveMethod("foo");
/// ...
/// result.wait();
/// std::cout << result.data() << std::endl;
///
/// The way an ActiveMethod is started can be changed by passing a StarterType
/// template argument with a corresponding class. The default ActiveStarter
/// starts the method in its own thread, obtained from a thread pool.
///
/// For an alternative implementation of StarterType, see ActiveDispatcher.
///
/// For methods that do not require an argument or a return value, the Void
/// class can be used.
{
public:
typedef ResultType (OwnerType::*Callback)(const ArgType&);
typedef ActiveResult<ResultType> ActiveResultType;
typedef ActiveRunnable<ResultType, ArgType, OwnerType> ActiveRunnableType;
ActiveMethod(OwnerType* pOwner, Callback method):
_pOwner(pOwner),
_method(method)
/// Creates an ActiveMethod object.
{
poco_check_ptr (pOwner);
}
ActiveResultType operator () (const ArgType& arg)
/// Invokes the ActiveMethod.
{
ActiveResultType result(new ActiveResultHolder<ResultType>());
ActiveRunnableBase::Ptr pRunnable(new ActiveRunnableType(_pOwner, _method, arg, result));
StarterType::start(_pOwner, pRunnable);
return result;
}
ActiveMethod(const ActiveMethod& other):
_pOwner(other._pOwner),
_method(other._method)
{
}
ActiveMethod& operator = (const ActiveMethod& other)
{
ActiveMethod tmp(other);
swap(tmp);
return *this;
}
void swap(ActiveMethod& other)
{
std::swap(_pOwner, other._pOwner);
std::swap(_method, other._method);
}
private:
ActiveMethod();
OwnerType* _pOwner;
Callback _method;
};
template <class ResultType, class OwnerType, class StarterType>
class ActiveMethod <ResultType, void, OwnerType, StarterType>
/// An active method is a method that, when called, executes
/// in its own thread. ActiveMethod's take exactly one
/// argument and can return a value. To pass more than one
/// argument to the method, use a struct.
/// The following example shows how to add an ActiveMethod
/// to a class:
///
/// class ActiveObject
/// {
/// public:
/// ActiveObject():
/// exampleActiveMethod(this, &ActiveObject::exampleActiveMethodImpl)
/// {
/// }
///
/// ActiveMethod<std::string, std::string, ActiveObject> exampleActiveMethod;
///
/// protected:
/// std::string exampleActiveMethodImpl(const std::string& arg)
/// {
/// ...
/// }
/// };
///
/// And following is an example that shows how to invoke an ActiveMethod.
///
/// ActiveObject myActiveObject;
/// ActiveResult<std::string> result = myActiveObject.exampleActiveMethod("foo");
/// ...
/// result.wait();
/// std::cout << result.data() << std::endl;
///
/// The way an ActiveMethod is started can be changed by passing a StarterType
/// template argument with a corresponding class. The default ActiveStarter
/// starts the method in its own thread, obtained from a thread pool.
///
/// For an alternative implementation of StarterType, see ActiveDispatcher.
///
/// For methods that do not require an argument or a return value, simply use void.
{
public:
typedef ResultType (OwnerType::*Callback)(void);
typedef ActiveResult<ResultType> ActiveResultType;
typedef ActiveRunnable<ResultType, void, OwnerType> ActiveRunnableType;
ActiveMethod(OwnerType* pOwner, Callback method):
_pOwner(pOwner),
_method(method)
/// Creates an ActiveMethod object.
{
poco_check_ptr (pOwner);
}
ActiveResultType operator () (void)
/// Invokes the ActiveMethod.
{
ActiveResultType result(new ActiveResultHolder<ResultType>());
ActiveRunnableBase::Ptr pRunnable(new ActiveRunnableType(_pOwner, _method, result));
StarterType::start(_pOwner, pRunnable);
return result;
}
ActiveMethod(const ActiveMethod& other):
_pOwner(other._pOwner),
_method(other._method)
{
}
ActiveMethod& operator = (const ActiveMethod& other)
{
ActiveMethod tmp(other);
swap(tmp);
return *this;
}
void swap(ActiveMethod& other)
{
std::swap(_pOwner, other._pOwner);
std::swap(_method, other._method);
}
private:
ActiveMethod();
OwnerType* _pOwner;
Callback _method;
};
} // namespace Poco
#endif // Foundation_ActiveMethod_INCLUDED