141 lines
3.6 KiB
C++
141 lines
3.6 KiB
C++
/**
|
|
*******************************************************************************
|
|
* Copyright (C) 2001-2003, International Business Machines Corporation and *
|
|
* others. All Rights Reserved. *
|
|
*******************************************************************************
|
|
*/
|
|
#ifndef ICUNOTIF_H
|
|
#define ICUNOTIF_H
|
|
|
|
#include "unicode/utypes.h"
|
|
|
|
#if UCONFIG_NO_SERVICE
|
|
|
|
U_NAMESPACE_BEGIN
|
|
|
|
/*
|
|
* Allow the declaration of APIs with pointers to BreakIterator
|
|
* even when break iteration is removed from the build.
|
|
*/
|
|
class ICUNotifier;
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#else
|
|
|
|
#include "unicode/uobject.h"
|
|
#include "unicode/unistr.h"
|
|
|
|
#include "mutex.h"
|
|
#include "uvector.h"
|
|
|
|
U_NAMESPACE_BEGIN
|
|
|
|
class U_COMMON_API EventListener : public UObject {
|
|
public:
|
|
virtual ~EventListener() {}
|
|
|
|
public:
|
|
static inline UClassID getStaticClassID() {
|
|
return (UClassID)&fgClassID;
|
|
}
|
|
|
|
virtual UClassID getDynamicClassID() const {
|
|
return getStaticClassID();
|
|
}
|
|
|
|
public:
|
|
virtual UnicodeString& debug(UnicodeString& result) const {
|
|
return debugClass(result);
|
|
}
|
|
|
|
virtual UnicodeString& debugClass(UnicodeString& result) const {
|
|
return result.append("Key");
|
|
}
|
|
|
|
private:
|
|
static const char fgClassID;
|
|
};
|
|
|
|
/**
|
|
* <p>Abstract implementation of a notification facility. Clients add
|
|
* EventListeners with addListener and remove them with removeListener.
|
|
* Notifiers call notifyChanged when they wish to notify listeners.
|
|
* This queues the listener list on the notification thread, which
|
|
* eventually dequeues the list and calls notifyListener on each
|
|
* listener in the list.</p>
|
|
*
|
|
* <p>Subclasses override acceptsListener and notifyListener
|
|
* to add type-safe notification. AcceptsListener should return
|
|
* true if the listener is of the appropriate type; ICUNotifier
|
|
* itself will ensure the listener is non-null and that the
|
|
* identical listener is not already registered with the Notifier.
|
|
* NotifyListener should cast the listener to the appropriate
|
|
* type and call the appropriate method on the listener.
|
|
*/
|
|
|
|
class U_COMMON_API ICUNotifier : public UMemory {
|
|
private: UMTX notifyLock;
|
|
private: UVector* listeners;
|
|
|
|
public:
|
|
ICUNotifier(void)
|
|
: notifyLock(0), listeners(NULL)
|
|
{
|
|
umtx_init(¬ifyLock);
|
|
}
|
|
|
|
virtual ~ICUNotifier(void) {
|
|
{
|
|
Mutex lmx(¬ifyLock);
|
|
delete listeners;
|
|
listeners = NULL;
|
|
}
|
|
umtx_destroy(¬ifyLock);
|
|
}
|
|
|
|
/**
|
|
* Add a listener to be notified when notifyChanged is called.
|
|
* The listener must not be null. AcceptsListener must return
|
|
* true for the listener. Attempts to concurrently
|
|
* register the identical listener more than once will be
|
|
* silently ignored.
|
|
*/
|
|
virtual void addListener(const EventListener* l, UErrorCode& status);
|
|
|
|
/**
|
|
* Stop notifying this listener. The listener must
|
|
* not be null. Attemps to remove a listener that is
|
|
* not registered will be silently ignored.
|
|
*/
|
|
virtual void removeListener(const EventListener* l, UErrorCode& status);
|
|
|
|
/**
|
|
* ICU doesn't spawn its own threads. All listeners are notified in
|
|
* the thread of the caller. Misbehaved listeners can therefore
|
|
* indefinitely block the calling thread. Callers should beware of
|
|
* deadlock situations.
|
|
*/
|
|
virtual void notifyChanged(void);
|
|
|
|
protected:
|
|
/**
|
|
* Subclasses implement this to return TRUE if the listener is
|
|
* of the appropriate type.
|
|
*/
|
|
virtual UBool acceptsListener(const EventListener& l) const = 0;
|
|
|
|
/**
|
|
* Subclasses implement this to notify the listener.
|
|
*/
|
|
virtual void notifyListener(EventListener& l) const = 0;
|
|
};
|
|
|
|
U_NAMESPACE_END
|
|
|
|
/* UCONFIG_NO_SERVICE */
|
|
#endif
|
|
|
|
/* ICUNOTIF_H */
|
|
#endif
|