33bbbf4827
git-svn-id: https://svn.vbchaos.nl/svn/hsb/trunk@418 05563f52-14a8-4384-a975-3d1654cca0fa
137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/* -----------------------------------------------------------------------------
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* Observable.h (c) 2013 Micro-Key bv
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* -----------------------------------------------------------------------------
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* Micro-Key bv
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* Industrieweg 28, 9804 TG Noordhorn
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* Postbus 92, 9800 AB Zuidhorn
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* The Netherlands
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* Tel: +31 594 503020
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* Fax: +31 594 505825
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* Email: support@microkey.nl
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* Web: www.microkey.nl
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* -----------------------------------------------------------------------------
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* Description: Observer design pattern
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* -----------------------------------------------------------------------------
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* $Id$
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* -----------------------------------------------------------------------------
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*/
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/**
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* Observable implementation
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* \defgroup Observable Package Observable
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* \ingroup HAL
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* @{
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*/
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#ifndef _OBSERVABLE_H_
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#define _OBSERVABLE_H_
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/* --------------*
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* Include files *
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* --------------*
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*/
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#include "stm32f10x.h"
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#include "Observer.h"
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/* -------------------------------*
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* Constant and macro definitions *
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* -------------------------------*
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*/
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/**
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* Maximal number of Observers for one Observable.
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*/
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#define OBSERVABLE_MAX_OBSERVERS (10)
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/**
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* Static initializer for the Observable class.
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* Typical usage: struct Observable observable = OBSERVABLE_INITIALIZER;
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*/
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#define OBSERVABLE_INITIALIZER { .nrOfObservers = 0, .observers = { 0, } }
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/* ------------------*
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* Type definitions. *
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* ------------------*
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*/
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/**
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* The Observable class.
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*/
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struct Observable
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{
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int nrOfObservers;
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Observer observers[OBSERVABLE_MAX_OBSERVERS];
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};
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/* ----------------------*
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* Function declarations *
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* ----------------------*
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*/
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/**
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* Initializes the Observable class.
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* This is not needed if the Observable has been statically initialized by "struct Observable observable = OBSERVABLE_INITIALIZER".
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* @param self: address of the Observable struct.
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* @retval none.
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*/
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void Observable_construct(struct Observable* self);
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/**
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* Terminates the Observable class. All Observers are removed.
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* @param self: address of the Observable struct.
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* @retval none.
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*/
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void Observable_destruct(struct Observable* self);
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/**
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* Adds one Observer to the Observable.
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* @param self: address of the Observable struct.
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* @param observer: Observer to be added.
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* @retval ErrorStatus: returns an error in case the maximum number of Observers have been added.
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*/
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ErrorStatus Observable_addObserver(struct Observable* self, const Observer observer);
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/**
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* Adds one Observer to the Observable at the front of the list.
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* This ensures that this Observer is notified before Observers added by Observable_addObserver.
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* @param self: address of the Observable struct.
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* @param observer: Observer to be added.
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* @retval ErrorStatus: returns an error in case the maximum number of Observers have been added.
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*/
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ErrorStatus Observable_addObserverAtFront(struct Observable* self, const Observer observer);
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/**
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* Notifies all Observers by calling the Observer callback function. The parameter void* data will be
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* passed as parameter to the Observer.
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* @param self: address of the Observable struct.
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* @param data: void pointer data to be passed as parameter to the Observer.
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* @retval ErrorStatus: returns an error in case one or more of the Observers returned an error.
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*/
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ErrorStatus Observable_notifyObservers(const struct Observable* self, const void* const data);
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/**
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* Deletes one specific Observer added before. If the Observer cannot be found, no action is taken.
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* @param self: address of the Observable struct.
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* @param observer: Observer to be deleted.
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*/
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void Observable_deleteObserver(struct Observable* self, const Observer observer);
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/**
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* Deletes all Observers added.
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* @param self: address of the Observable struct.
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*/
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void Observable_deleteObservers(struct Observable* self);
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/**
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* Returns the number of Observers currently subscribed to an Observable.
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* @param self: address of the Observable struct.
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*/
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int Observable_nrOfObservers(struct Observable* self);
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#endif
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/** @} */
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