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#import <Foundation/Foundation.h>

@interface Profiler : NSObject
{
    id target;
}
- (id)initWithObject:(id)aTarget;
- (void)setTarget:(id)aTarget;
@end

@implementation Profiler
- (id)initWithObject:(id)aTarget
{
    [super init];
    target = aTarget;
    return self;
}
- (id)init
{
    return [self initWithObject:nil];
}
- (void)setTarget:(id)aTarget
{
    target = aTarget;
    return;
}
- (void)profile:(NSInvocation *)anInvocation
{
    NSLog(@"start profiling [%@ %s]", [target className], [anInvocation selector]);
    NSDate *startTime = [NSDate date];
    [anInvocation invokeWithTarget:target];
    NSDate *endTime = [NSDate date];
    NSLog(@"finished!");
    NSLog(@"process time: %f (sec)", [endTime timeIntervalSinceDate:startTime]);
    return;
}
// メッセージ転送によって「対象の関数と同じ引数でプロファイル」を実現する
// Profilerの実装していないメッセージが来たら、
// 実行時間の計測をしつつ実際の処理はtargetに移譲
- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector
{
    if ([target respondsToSelector:aSelector])
        return [target methodSignatureForSelector:aSelector];
    else
        return [super methodSignatureForSelector:aSelector];
}
- (BOOL)respondsToSelector:(SEL)aSelector
{
    if ([super respondsToSelector:aSelector])
        return YES;
    if ([self methodForSelector:aSelector] != (IMP)NULL)
        return YES;
    if ([target respondsToSelector:aSelector])
        return YES;
    return NO;
}
- (void)forwardInvocation:(NSInvocation *)anInvocation
{
    if ([target respondsToSelector:[anInvocation selector]])
    {
        [self profile:anInvocation];
    }
    else
    {
        [super forwardInvocation:anInvocation];
    }
    return;
}
//--- メッセージ転送処理ここまで
@end

@interface TestClass : NSObject
{
    NSTimeInterval interval;
}
- (void)func:(int)times;
@end

@implementation TestClass
- (id)init
{
    [super init];
    interval = 1.0;
    return self;
}
- (void)func:(int)times
{
    int i;
    for (i = 0; i < times; i++)
    {
        NSLog(@"一言言って%f秒待つことを%d回繰り返すだけの簡単なお仕事です", interval, times);
        [NSThread sleepForTimeInterval:interval];
        // Xcode 2.x だとスレッドのスリープはこっち
        // [NSThread sleepUntilDate:[NSDate dateWithTimeIntervalSinceNow:interval]];
    }
}
@end

int main(int argc, const char *argv[])
{
    NSAutoreleasePool *pool = [NSAutoreleasePool new];
    
    id testTarget = [TestClass new];
    Profiler *profiler = [[Profiler alloc] initWithObject:testTarget];

    //profilerに本来testTargetが受けとるはずのメッセージを送ってやる
    [profiler func:3];

    [pool release];
    return 0;
}