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MABaseFuture.m
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MABaseFuture.m
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#import "MABaseFuture.h"
#import <objc/runtime.h>
@implementation MABaseFuture
- (id)init
{
_lock = [[NSCondition alloc] init];
return self;
}
- (void)dealloc
{
[_value release];
[_lock release];
[super dealloc];
}
- (void)setFutureValue: (id)value
{
[_lock lock];
[self setFutureValueUnlocked: value];
[_lock unlock];
}
- (id)futureValue
{
// skip the usual retain/autorelease dance here
// because the setter is never called more than
// once, thus value lifetime is same as future
// lifetime
[_lock lock];
id value = _value;
[_lock unlock];
return value;
}
- (void)setFutureValueUnlocked: (id)value
{
[value retain];
[_value release];
_value = value;
_resolved = YES;
[_lock broadcast];
}
- (BOOL)futureHasResolved
{
return _resolved;
}
- (id)waitForFutureResolution
{
[_lock lock];
while(!_resolved)
[_lock wait];
[_lock unlock];
return _value;
}
- (id)resolveFuture
{
NSAssert1(NO, @"-[MABaseFuture resolveFuture] called, this should never happen! Did you forget to implement -[%@ resolveFuture]?", NSStringFromClass(isa));
__builtin_unreachable();
}
- (Class)class
{
Class c = [[self resolveFuture] class];
if([NSStringFromClass(c) hasPrefix: @"NSCF"])
return [c superclass];
else
return c;
}
@end