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#import "NSObject+SPInvocationGrabbing.h"
#import <execinfo.h>
#pragma mark Invocation grabbing
@interface SPInvocationGrabber ()
@property (readwrite, retain, nonatomic) id object;
@property (readwrite, retain, nonatomic) NSInvocation *invocation;
@end
@implementation SPInvocationGrabber
@synthesize invocation = _invocation, object = _object;
@synthesize backgroundAfterForward, onMainAfterForward, waitUntilDone;
- (id)initWithObject:(id)obj
{
return [self initWithObject:obj stacktraceSaving:YES];
}
-(id)initWithObject:(id)obj stacktraceSaving:(BOOL)saveStack
{
self.object = obj;
if(saveStack)
[self saveBacktrace];
return self;
}
-(void)dealloc
{
free(frameStrings);
self.object = nil;
self.invocation = nil;
[super dealloc];
}
- (void)runInBackground
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
@try {
[self invoke];
}
@finally {
[pool drain];
}
}
- (void)forwardInvocation:(NSInvocation *)anInvocation
{
[anInvocation retainArguments];
anInvocation.target = _object;
self.invocation = anInvocation;
if(backgroundAfterForward)
[NSThread detachNewThreadSelector:@selector(runInBackground) toTarget:self withObject:nil];
else if(onMainAfterForward)
[self performSelectorOnMainThread:@selector(invoke) withObject:nil waitUntilDone:waitUntilDone];
}
- (NSMethodSignature *)methodSignatureForSelector:(SEL)inSelector
{
NSMethodSignature *signature = [super methodSignatureForSelector:inSelector];
if (signature == NULL)
signature = [_object methodSignatureForSelector:inSelector];
return signature;
}
- (void)invoke
{
@try {
[_invocation invoke];
}
@catch (NSException * e) {
NSLog(@"SPInvocationGrabber's target raised %@:\n\t%@\nInvocation was originally scheduled at:", e.name, e);
[self printBacktrace];
printf("\n");
[e raise];
}
self.invocation = nil;
self.object = nil;
}
-(void)saveBacktrace
{
void *backtraceFrames[128];
frameCount = backtrace(&backtraceFrames[0], 128);
frameStrings = backtrace_symbols(&backtraceFrames[0], frameCount);
}
-(void)printBacktrace
{
for(int x = 3; x < frameCount; x++) {
if(frameStrings[x] == NULL) { break; }
printf("%s\n", frameStrings[x]);
}
}
@end
@implementation NSObject (SPInvocationGrabbing)
-(id)grab
{
return [[[SPInvocationGrabber alloc] initWithObject:self] autorelease];
}
-(id)invokeAfter:(NSTimeInterval)delta
{
id grabber = [self grab];
[NSTimer scheduledTimerWithTimeInterval:delta target:grabber selector:@selector(invoke) userInfo:nil repeats:NO];
return grabber;
}
- (id)nextRunloop
{
return [self invokeAfter:0];
}
-(id)inBackground
{
SPInvocationGrabber *grabber = [self grab];
grabber.backgroundAfterForward = YES;
return grabber;
}
-(id)onMainAsync:(BOOL)async
{
SPInvocationGrabber *grabber = [self grab];
grabber.onMainAfterForward = YES;
grabber.waitUntilDone = !async;
return grabber;
}
@end
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