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124 lines
3.5 KiB
C++
124 lines
3.5 KiB
C++
/**
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*******************************************************************************
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* Copyright (C) 2001-2004, International Business Machines Corporation and *
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* others. All Rights Reserved. *
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*******************************************************************************
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*/
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#ifndef ICUNOTIF_H
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#define ICUNOTIF_H
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#include "unicode/utypes.h"
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#if UCONFIG_NO_SERVICE
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U_NAMESPACE_BEGIN
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/*
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* Allow the declaration of APIs with pointers to BreakIterator
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* even when break iteration is removed from the build.
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*/
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class ICUNotifier;
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U_NAMESPACE_END
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#else
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#include "unicode/uobject.h"
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#include "unicode/unistr.h"
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#include "mutex.h"
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#include "uvector.h"
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U_NAMESPACE_BEGIN
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class U_COMMON_API EventListener : public UObject {
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public:
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virtual ~EventListener();
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public:
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static UClassID U_EXPORT2 getStaticClassID();
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virtual UClassID getDynamicClassID() const;
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public:
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#ifdef SERVICE_DEBUG
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virtual UnicodeString& debug(UnicodeString& result) const {
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return debugClass(result);
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}
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virtual UnicodeString& debugClass(UnicodeString& result) const {
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return result.append("Key");
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}
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#endif
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};
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/**
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* <p>Abstract implementation of a notification facility. Clients add
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* EventListeners with addListener and remove them with removeListener.
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* Notifiers call notifyChanged when they wish to notify listeners.
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* This queues the listener list on the notification thread, which
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* eventually dequeues the list and calls notifyListener on each
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* listener in the list.</p>
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*
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* <p>Subclasses override acceptsListener and notifyListener
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* to add type-safe notification. AcceptsListener should return
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* true if the listener is of the appropriate type; ICUNotifier
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* itself will ensure the listener is non-null and that the
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* identical listener is not already registered with the Notifier.
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* NotifyListener should cast the listener to the appropriate
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* type and call the appropriate method on the listener.
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*/
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class U_COMMON_API ICUNotifier : public UMemory {
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private: UMTX notifyLock;
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private: UVector* listeners;
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public:
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ICUNotifier(void);
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virtual ~ICUNotifier(void);
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/**
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* Add a listener to be notified when notifyChanged is called.
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* The listener must not be null. AcceptsListener must return
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* true for the listener. Attempts to concurrently
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* register the identical listener more than once will be
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* silently ignored.
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*/
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virtual void addListener(const EventListener* l, UErrorCode& status);
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/**
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* Stop notifying this listener. The listener must
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* not be null. Attemps to remove a listener that is
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* not registered will be silently ignored.
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*/
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virtual void removeListener(const EventListener* l, UErrorCode& status);
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/**
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* ICU doesn't spawn its own threads. All listeners are notified in
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* the thread of the caller. Misbehaved listeners can therefore
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* indefinitely block the calling thread. Callers should beware of
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* deadlock situations.
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*/
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virtual void notifyChanged(void);
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protected:
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/**
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* Subclasses implement this to return TRUE if the listener is
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* of the appropriate type.
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*/
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virtual UBool acceptsListener(const EventListener& l) const = 0;
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/**
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* Subclasses implement this to notify the listener.
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*/
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virtual void notifyListener(EventListener& l) const = 0;
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};
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U_NAMESPACE_END
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/* UCONFIG_NO_SERVICE */
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#endif
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/* ICUNOTIF_H */
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#endif
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