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NSPort.m
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252 lines (211 loc) · 5.5 KB
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/** Implementation of abstract superclass port for use with NSConnection
Copyright (C) 1997, 1998 Free Software Foundation, Inc.
Written by: Richard Frith-Macdonald <richard@brainstorm.co.uk>
Created: August 1997
This file is part of the GNUstep Base Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110 USA.
<title>NSPort class reference</title>
$Date$ $Revision$
*/
#import "common.h"
#define EXPOSE_NSPort_IVARS 1
#import "Foundation/NSException.h"
#import "Foundation/NSNotification.h"
#import "Foundation/NSNotificationQueue.h"
#import "Foundation/NSPort.h"
#import "Foundation/NSPortCoder.h"
#import "Foundation/NSPortNameServer.h"
#import "Foundation/NSRunLoop.h"
#import "Foundation/NSAutoreleasePool.h"
#import "Foundation/NSUserDefaults.h"
#import "GSPrivate.h"
@class NSMessagePort;
@implementation NSObject(NSPortDelegateMethods)
- (void) handlePortMessage: (NSPortMessage*)aMessage
{
}
@end
@implementation NSPort
static Class NSPort_abstract_class;
static Class NSPort_concrete_class;
+ (id) allocWithZone: (NSZone*)aZone
{
if (self == NSPort_abstract_class)
{
return NSAllocateObject(NSPort_concrete_class, 0, aZone);
}
else
{
return NSAllocateObject(self, 0, aZone);
}
}
+ (void) initialize
{
if (self == [NSPort class])
{
NSUserDefaults *defs;
GSMakeWeakPointer(self, "delegate");
NSPort_abstract_class = self;
NSPort_concrete_class = [NSMessagePort class];
defs = [NSUserDefaults standardUserDefaults];
if ([defs objectForKey: @"NSPortIsMessagePort"] != nil
&& [defs boolForKey: @"NSPortIsMessagePort"] == NO)
{
NSPort_concrete_class = [NSSocketPort class];
}
}
}
+ (NSPort*) port
{
if (self == NSPort_abstract_class)
return AUTORELEASE([NSPort_concrete_class new]);
else
return AUTORELEASE([self new]);
}
+ (NSPort*) portWithMachPort: (NSInteger)machPort
{
return AUTORELEASE([[self alloc] initWithMachPort: machPort]);
}
- (id) copyWithZone: (NSZone*)aZone
{
return RETAIN(self);
}
- (id) delegate
{
return _delegate;
}
- (void) encodeWithCoder: (NSCoder*)aCoder
{
[(NSPortCoder*)aCoder encodePortObject: self];
}
- (id) init
{
self = [super init];
return self;
}
- (id) initWithCoder: (NSCoder*)aCoder
{
id obj = [(NSPortCoder*)aCoder decodePortObject];
if (obj != self)
{
DESTROY(self);
self = RETAIN(obj);
}
return self;
}
- (id) initWithMachPort: (NSInteger)machPort
{
[self shouldNotImplement: _cmd];
return nil;
}
/*
* subclasses should override this method and call [super invalidate]
* in their versions of the method.
*/
- (void) invalidate
{
NSAutoreleasePool *arp = [NSAutoreleasePool new];
_is_valid = NO;
[[NSNotificationCenter defaultCenter]
postNotificationName: NSPortDidBecomeInvalidNotification
object: self];
[arp drain];
}
- (BOOL) isValid
{
return _is_valid;
}
- (NSInteger) machPort
{
[self shouldNotImplement: _cmd];
return 0;
}
- (id) retain
{
return [super retain];
}
- (id) autorelease
{
return [super autorelease];
}
- (oneway void) release
{
if (_is_valid && [self retainCount] == 1)
{
/*
* If the port is about to have a final release deallocate it
* we must invalidate it.
* Bracket with retain/release pair to prevent recursion.
*/
[super retain];
[self invalidate];
[super release];
}
[super release];
}
- (void) setDelegate: (id) anObject
{
NSAssert(anObject == nil
|| [anObject respondsToSelector: @selector(handlePortMessage:)],
NSInvalidArgumentException);
_delegate = anObject;
}
- (void) addConnection: (NSConnection*)aConnection
toRunLoop: (NSRunLoop*)aLoop
forMode: (NSString*)aMode
{
[aLoop addPort: self forMode: aMode];
}
- (void) removeConnection: (NSConnection*)aConnection
fromRunLoop: (NSRunLoop*)aLoop
forMode: (NSString*)aMode
{
[aLoop removePort: self forMode: aMode];
}
- (NSUInteger) reservedSpaceLength
{
[self subclassResponsibility: _cmd];
return 0;
}
- (BOOL) sendBeforeDate: (NSDate*)when
components: (NSMutableArray*)components
from: (NSPort*)receivingPort
reserved: (NSUInteger)length
{
return [self sendBeforeDate: when
msgid: 0
components: components
from: receivingPort
reserved: length];
}
- (BOOL) sendBeforeDate: (NSDate*)when
msgid: (NSInteger)msgid
components: (NSMutableArray*)components
from: (NSPort*)receivingPort
reserved: (NSUInteger)length
{
[self subclassResponsibility: _cmd];
return YES;
}
@end
/*
* This is a callback method used by the NSRunLoop class to determine which
* descriptors to watch for the port. Subclasses override it.
*/
@implementation NSPort (GNUstep)
- (void) getFds: (NSInteger*)fds count: (NSInteger*)count
{
*count = 0;
}
@end