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/* Implementation of reference-counted invalidation notifer object
Copyright (C) 1993,1994 Free Software Foundation, Inc.
Written by: R. Andrew McCallum <mccallum@gnu.ai.mit.edu>
Date: July 1994
This file is part of the GNU Objective C Class Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* Reference Counted object with invalidation notification
This object is just temporary. Eventually, we should separate
reference counting functionality from notification functionality */
#include <objects/RetainingNotifier.h>
#include <objects/InvalidationListening.h>
#include <assert.h>
/* Use this for now, but GNU should switch to a GC pool
and separate notification. */
/* I really need to check the use of locks here */
@implementation RetainingNotifier
+ initialize
{
/* What goes here? */
return self;
}
- init
{
retain_count = 0;
isValid = YES;
refGate = [[Lock alloc] init];
notificationList = [[List alloc] init];
return self;
}
- (void) dealloc
{
[refGate free];
[notificationList free];
[super free];
return;
}
- (oneway void) release
{
[refGate lock];
if (retain_count--)
{
[refGate unlock];
return;
}
[refGate unlock];
[self dealloc];
return;
}
- (id) retain
{
[refGate lock];
retain_count++;
[refGate unlock];
return self;
}
- free
{
[self release];
return nil;
}
- (unsigned) retainCount
{
return retain_count;
}
- registerForInvalidationNotification: (id <InvalidationListening>)anObject
{
assert(refGate);
[refGate lock];
[notificationList addObjectIfAbsent: anObject];
[refGate unlock];
return self;
}
- unregisterForInvalidationNotification: (id <InvalidationListening>)anObject
{
assert(refGate);
[refGate lock];
[notificationList removeObject: anObject];
[refGate unlock];
return self;
}
- (BOOL) isValid
{
return isValid;
}
/* change name to -postInvalidation */
- invalidate
{
if (isValid == NO)
return nil;
[refGate lock];
isValid = NO;
[notificationList makeObjectsPerform:@selector(senderIsInvalid:) with:self];
[refGate unlock];
return self;
}
- copy
{
RetainingNotifier *newCopy = nil;
if (isValid)
{
[refGate lock];
newCopy = [[[self class] alloc] init];
[newCopy->notificationList appendList:notificationList];
newCopy->retain_count = retain_count;
[refGate unlock];
}
return newCopy;
}
@end
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