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QReachabilityOperation.m
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174 lines (140 loc) · 6.61 KB
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/*
File: QReachabilityOperation.h
Contains: Runs until a host's reachability attains a certain value.
Written by: DTS
Copyright: Copyright (c) 2010 Apple Inc. All Rights Reserved.
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc.
("Apple") in consideration of your agreement to the following
terms, and your use, installation, modification or
redistribution of this Apple software constitutes acceptance of
these terms. If you do not agree with these terms, please do
not use, install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following
terms, and subject to these terms, Apple grants you a personal,
non-exclusive license, under Apple's copyrights in this
original Apple software (the "Apple Software"), to use,
reproduce, modify and redistribute the Apple Software, with or
without modifications, in source and/or binary forms; provided
that if you redistribute the Apple Software in its entirety and
without modifications, you must retain this notice and the
following text and disclaimers in all such redistributions of
the Apple Software. Neither the name, trademarks, service marks
or logos of Apple Inc. may be used to endorse or promote
products derived from the Apple Software without specific prior
written permission from Apple. Except as expressly stated in
this notice, no other rights or licenses, express or implied,
are granted by Apple herein, including but not limited to any
patent rights that may be infringed by your derivative works or
by other works in which the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis.
APPLE MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT,
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING
THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT,
INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY
OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY
OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR
OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#import "QReachabilityOperation.h"
@interface QReachabilityOperation ()
// read/write versions of public properties
@property (assign, readwrite) NSUInteger flags;
// forward declarations
static void ReachabilityCallback(
SCNetworkReachabilityRef target,
SCNetworkReachabilityFlags flags,
void * info
);
- (void)reachabilitySetFlags:(NSUInteger)newValue;
@end
@implementation QReachabilityOperation
- (id)initWithHostName:(NSString *)hostName
// See comment in header.
{
assert(hostName != nil);
self = [super init];
if (self != nil) {
self->_hostName = [hostName copy];
self->_flagsTargetMask = kSCNetworkReachabilityFlagsReachable | kSCNetworkReachabilityFlagsInterventionRequired;
self->_flagsTargetValue = kSCNetworkReachabilityFlagsReachable;
}
return self;
}
- (void)dealloc
{
[self->_hostName release];
assert(self->_ref == NULL);
[super dealloc];
}
@synthesize hostName = _hostName;
@synthesize flagsTargetMask = _flagsTargetMask;
@synthesize flagsTargetValue = _flagsTargetValue;
@synthesize flags = _flags;
- (void)operationDidStart
// Called by QRunLoopOperation when the operation starts. This is our opportunity
// to install our run loop callbacks, which is exactly what we do. The only tricky
// thing is that we have to schedule the reachability ref to run in all of the
// run loop modes specified by our client.
{
Boolean success;
SCNetworkReachabilityContext context = { 0, self, NULL, NULL, NULL };
assert(self->_ref == NULL);
self->_ref = SCNetworkReachabilityCreateWithName(NULL, [self.hostName UTF8String]);
assert(self->_ref != NULL);
success = SCNetworkReachabilitySetCallback(self->_ref, ReachabilityCallback, &context);
assert(success);
for (NSString * mode in self.actualRunLoopModes) {
success = SCNetworkReachabilityScheduleWithRunLoop(self->_ref, CFRunLoopGetCurrent(), (CFStringRef) mode);
assert(success);
}
}
static void ReachabilityCallback(
SCNetworkReachabilityRef target,
SCNetworkReachabilityFlags flags,
void * info
)
// Called by the system when the reachability flags change. We just forward
// the flags to our Objective-C code.
{
QReachabilityOperation * obj;
obj = (QReachabilityOperation *) info;
assert([obj isKindOfClass:[QReachabilityOperation class]]);
assert(target == obj->_ref);
#pragma unused(target)
[obj reachabilitySetFlags:flags];
}
- (void)reachabilitySetFlags:(NSUInteger)newValue
// Called when the reachability flags change. We just store the flags and then
// check to see if the flags meet our target criteria, in which case we stop the
// operation.
{
assert( [NSThread currentThread] == self.actualRunLoopThread );
self.flags = newValue;
if ( (self.flags & self.flagsTargetMask) == self.flagsTargetValue ) {
[self finishWithError:nil];
}
}
- (void)operationWillFinish
// Called by QRunLoopOperation when the operation finishes. We just clean up
// our reachability ref.
{
Boolean success;
if (self->_ref != NULL) {
for (NSString * mode in self.actualRunLoopModes) {
success = SCNetworkReachabilityUnscheduleFromRunLoop(self->_ref, CFRunLoopGetCurrent(), (CFStringRef) mode);
assert(success);
}
success = SCNetworkReachabilitySetCallback(self->_ref, NULL, NULL);
assert(success);
CFRelease(self->_ref);
self->_ref = NULL;
}
}
@end