ThreadSafeObject

CODE

- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector {
 return [[_container class] instanceMethodSignatureForSelector:aSelector];
}
- (void)forwardInvocation:(NSInvocation *)anInvocation
{
 NSMethodSignature *sig = [anInvocation valueForKey:@"_signature"];
 const char *returnType = sig.methodReturnType;
 // NSLog(@"%@ = > %@",anInvocation.target, NSStringFromSelector(anInvocation.selector));
 // NSLog(@"%s",returnType);
 if (!strcmp(returnType, "v")) {
 /** the setter method just use async dispatch 
 remove the barrier to make it faster when u r sure that invacations will not affect each other
 */
 dispatch_barrier_async(_dispatchQueue, ^{
 [anInvocation invokeWithTarget:_container];
 });
 }
 else {
 /** all getter method need sync dispatch 
 barrier make sure the result is correct
 getter method need barrier in most ways unless u dont except this */
 dispatch_barrier_sync(_dispatchQueue, ^{
 [anInvocation invokeWithTarget:_container];
 });
 }
}

SAMPLE

@protocol JXMutableArrayProtocol 
@optional
- (id)lastObject;
- (id)objectAtIndex:(NSUInteger)index;
- (NSUInteger)count;
- (void)addObject:(id)anObject;
- (void)insertObject:(id)anObject atIndex:(NSUInteger)index;
- (void)removeLastObject;
- (void)removeObjectAtIndex:(NSUInteger)index;
- (void)replaceObjectAtIndex:(NSUInteger)index withObject:(id)anObject;
@end
/** this array is mutable and thread-safe 
 it provides some simple methods to operating an array 
 it is not the fastest way but quite convenient
 */
@interface JXMutableArray : JXMultiThreadObject <JXMutableArrayProtocol>
{
}
#import "JXMutableArray.h"
@implementation JXMutableArray
- (id)init
{
 self = [super init];
 if (self) {
 self.container = [NSMutableArray array];
 }
 return self;
}
@end

HOW TO USE

 JXMutableArray *ary = [[JXMutableArray alloc] init];
 NSOperationQueue *queue = [[NSOperationQueue alloc] init];
 queue.maxConcurrentOperationCount = 10;
 for (int i = 0; i < 200; i++) {
 NSNumber *number = [NSNumber numberWithInt:i];
 [queue addOperationWithBlock:^{
 [ary addObject:number];
 }];
 }
 [queue waitUntilAllOperationsAreFinished];
 NSLog(@"%d",ary.count);
 NSLog(@"%@",ary);