ACE_Future_Rep< T > Class Template Reference

ACE_Future_Rep<T> More...

#include <Future.h>

Collaboration diagram for ACE_Future_Rep< T >:

Protected Member Functions
	~ACE_Future_Rep (void)

Private Types
typedef ACE_Future_Observer< T >	OBSERVER
typedef ACE_Unbounded_Set< OBSERVER * >	OBSERVER_COLLECTION

Private Member Functions
int	set (const T &r, ACE_Future< T > &caller)
int	get (T &value, ACE_Time_Value *tv) const
int	attach (ACE_Future_Observer< T > *observer, ACE_Future< T > &caller)
int	detach (ACE_Future_Observer< T > *observer)
	operator T ()
void	dump (void) const
	Dump the state of an object. More...
int	ready (void) const
	Is result available? More...
	ACE_Future_Rep (void)

Static Private Member Functions
static ACE_Future_Rep< T > *	internal_create (void)
static ACE_Future_Rep< T > *	create (void)
	Create a ACE_Future_Rep<T> and initialize the reference count. More...
static ACE_Future_Rep< T > *	attach (ACE_Future_Rep< T > *&rep)
static void	detach (ACE_Future_Rep< T > *&rep)
static void	assign (ACE_Future_Rep< T > *&rep, ACE_Future_Rep< T > *new_rep)

Private Attributes
	ACE_ALLOC_HOOK_DECLARE
	Declare the dynamic allocation hooks. More...
T *	value_
	Pointer to the result. More...
int	ref_count_
	Reference count. More...
OBSERVER_COLLECTION	observer_collection_
	Keep a list of ACE_Future_Observers unread by client's reader thread. More...
ACE_SYNCH_RECURSIVE_MUTEX	value_ready_mutex_
ACE_SYNCH_RECURSIVE_CONDITION	value_ready_

Friends
class	ACE_Future< T >

Detailed Description

template<class T>
class ACE_Future_Rep< T >

ACE_Future_Rep<T>

An ACE_Future_Rep<T> object encapsules a pointer to an object of class T which is the result of an asynchronous method invocation. It is pointed to by ACE_Future<T> object[s] and only accessible through them.

Member Typedef Documentation

template<class T >

typedef ACE_Future_Observer<T> ACE_Future_Rep< T >::OBSERVER

private

template<class T >

typedef ACE_Unbounded_Set<OBSERVER *> ACE_Future_Rep< T >::OBSERVER_COLLECTION

private

Constructor & Destructor Documentation

template<class T >

ACE_Future_Rep< T >::ACE_Future_Rep ( void  )

private

template<class T >

ACE_Future_Rep< T >::~ACE_Future_Rep ( void  )

protected

Member Function Documentation

template<class T >

void ACE_Future_Rep< T >::assign ( ACE_Future_Rep< T > *&  rep, ACE_Future_Rep< T > *  new_rep  )

staticprivate

Decreases the rep's reference count and deletes rep if there are no more references to rep. Then assigns new_rep to rep.

Precondition (rep != 0 && new_rep != 0)

template<class T >

int ACE_Future_Rep< T >::attach ( ACE_Future_Observer< T > *  observer, ACE_Future< T > &  caller  )

private

Attaches the specified observer to a subject (i.e., the ACE_Future_Rep). The update method of the specified subject will be invoked with a copy of the written-to ACE_Future as input when the result gets set.

Returns 0 if the observer is successfully attached, 1 if the observer is already attached, and -1 if failures occur.

template<class T >

ACE_Future_Rep< T > * ACE_Future_Rep< T >::attach ( ACE_Future_Rep< T > *&  rep )

staticprivate

Increase the reference count and return argument. Uses the attribute "value_ready_mutex_" to synchronize reference count updating.

Precondition (rep != 0).

template<class T >

ACE_Future_Rep< T > * ACE_Future_Rep< T >::create ( void  )

staticprivate

Create a ACE_Future_Rep<T> and initialize the reference count.

template<class T >

int ACE_Future_Rep< T >::detach ( ACE_Future_Observer< T > *  observer )

private

Detaches the specified observer from a subject (i.e., the ACE_Future_Rep). The update method of the specified subject will not be invoked when the ACE_Future_Reps result gets set. Returns 1 if the specified observer was actually attached to the subject prior to this call and 0 if was not.

Returns 0 if the observer was successfully detached, and -1 if the observer was not attached in the first place.

template<class T >

void ACE_Future_Rep< T >::detach ( ACE_Future_Rep< T > *&  rep )

staticprivate

Decreases the reference count and deletes rep if there are no more references to rep.

Precondition (rep != 0)

template<class T >

void ACE_Future_Rep< T >::dump ( void  ) const

private

Dump the state of an object.

template<class T >

int ACE_Future_Rep< T >::get ( T &  value, ACE_Time_Value *  tv  ) const

private

Wait up to tv time to get the value. Note that tv must be specified in absolute time rather than relative time.

template<class T >

ACE_Future_Rep< T > * ACE_Future_Rep< T >::internal_create ( void  )

staticprivate

Allocate a new ACE_Future_Rep<T> instance, returning NULL if it cannot be created.

template<class T >

ACE_Future_Rep< T >::operator T ( )

private

Type conversion. will block forever until the result is available. Note that this method is going away in a subsequent release since it doesn't distinguish between failure results and success results (exceptions should be used, but they aren't portable...). The <get> method should be used instead since it separates the error value from the result, and also permits timeouts.

template<class T >

int ACE_Future_Rep< T >::ready ( void  ) const

private

Is result available?

template<class T >

int ACE_Future_Rep< T >::set ( const T &  r, ACE_Future< T > &  caller  )

private

Set the result value. The specified caller represents the future that invoked this <set> method, which is used to notify the list of future observers. Returns 0 for success, -1 on error. This function only has an effect the first time it is called for the object. Subsequent calls return 0 (success) but have no effect.

Friends And Related Function Documentation

template<class T >

friend class ACE_Future< T >

friend

Member Data Documentation

template<class T >

ACE_Future_Rep< T >::ACE_ALLOC_HOOK_DECLARE

private

Declare the dynamic allocation hooks.

template<class T >

OBSERVER_COLLECTION ACE_Future_Rep< T >::observer_collection_

private

Keep a list of ACE_Future_Observers unread by client's reader thread.

template<class T >

int ACE_Future_Rep< T >::ref_count_

private

Reference count.

template<class T >

T* ACE_Future_Rep< T >::value_

private

Pointer to the result.

template<class T >

ACE_SYNCH_RECURSIVE_CONDITION ACE_Future_Rep< T >::value_ready_

mutableprivate

template<class T >

ACE_SYNCH_RECURSIVE_MUTEX ACE_Future_Rep< T >::value_ready_mutex_

mutableprivate

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The documentation for this class was generated from the following files:

• Future.h
• Future.cpp