GCD编程(封装GCD)

//GCDGroup 类

@interface GCDGroup : NSObject

@property (strong, nonatomic, readonly) dispatch_group_t dispatchGroup;

#pragma 初始化以及释放

- (instancetype)init;

#pragma 使用方法

- (void)enter;

- (void)leave;

- (void)wait;

- (BOOL)wait:(int64_t)delta;

@end

#import "GCDGroup.h"

@interface GCDGroup ()

@property (strong, nonatomic, readwrite) dispatch_group_t dispatchGroup;

@end

@implementation GCDGroup

- (instancetype)init {

self = [super init];

if (self) {

self.dispatchGroup = dispatch_group_create();

}

return self;

}

- (void)enter {

dispatch_group_enter(self.dispatchGroup);

}

- (void)leave {

dispatch_group_leave(self.dispatchGroup);

}

- (void)wait {

dispatch_group_wait(self.dispatchGroup, DISPATCH_TIME_FOREVER);

}

- (BOOL)wait:(int64_t)delta {

return dispatch_group_wait(self.dispatchGroup,
\

;

}

@end

//GCDQueue 类

@class GCDGroup;

@interface GCDQueue : NSObject

@property (strong, readonly, nonatomic) dispatch_queue_t dispatchQueue;

+ (GCDQueue *)mainQueue;

+ (GCDQueue *)globalQueue;

+ (GCDQueue *)highPriorityGlobalQueue;

+ (GCDQueue *)lowPriorityGlobalQueue;

+ (GCDQueue *)backgroundPriorityGlobalQueue;

#pragma 便利的构造方法

+ (void)executeInMainQueue:(dispatch_block_t)block;

+ (void)executeInGlobalQueue:(dispatch_block_t)block;

+ (void)executeInHighPriorityGlobalQueue:(dispatch_block_t)block;

+ (void)executeInLowPriorityGlobalQueue:(dispatch_block_t)block;

+ (void)executeInBackgroundPriorityGlobalQueue:(dispatch_block_t)block;

+ (void)executeInMainQueue:(dispatch_block_t)block afterDelaySecs:(NSTimeInterval)sec;

+ (void)executeInGlobalQueue:(dispatch_block_t)block afterDelaySecs:(NSTimeInterval)sec;

+ (void)executeInHighPriorityGlobalQueue:(dispatch_block_t)block afterDelaySecs:(NSTimeInterval)sec;

+ (void)executeInLowPriorityGlobalQueue:(dispatch_block_t)block afterDelaySecs:(NSTimeInterval)sec;

+ (void)executeInBackgroundPriorityGlobalQueue:(dispatch_block_t)block afterDelaySecs:(NSTimeInterval)sec;

#pragma 初始化以及释放

- (instancetype)init;

- (instancetype)initSerial;

- (instancetype)initConcurrent;

#pragma 使用方法

- (void)execute:(dispatch_block_t)block;

- (void)execute:(dispatch_block_t)block afterDelay:(int64_t)delta;

- (void)waitExecute:(dispatch_block_t)block;

- (void)barrierExecute:(dispatch_block_t)block;

- (void)waitBarrierExecute:(dispatch_block_t)block;

- (void)suspend;

- (void)resume;

#pragma 与GCDGroup相关

- (void)execute:(dispatch_block_t)block inGroup:(GCDGroup *)group;

- (void)notify:(dispatch_block_t)block inGroup:(GCDGroup *)group;

@end

#import "GCDQueue.h"

#import "GCDGroup.h"

static GCDQueue *mainQueue;

static GCDQueue *globalQueue;

static GCDQueue *highPriorityGlobalQueue;

static GCDQueue *lowPriorityGlobalQueue;

static GCDQueue *backgroundPriorityGlobalQueue;

@interface GCDQueue ()

@property (strong, readwrite, nonatomic) dispatch_queue_t dispatchQueue;

@end

@implementation GCDQueue

+ (GCDQueue *)mainQueue {

return mainQueue;

}

+ (GCDQueue *)globalQueue {

return globalQueue;

}

+ (GCDQueue *)highPriorityGlobalQueue {

return highPriorityGlobalQueue;

}

+ (GCDQueue *)lowPriorityGlobalQueue {

return lowPriorityGlobalQueue;

}

+ (GCDQueue *)backgroundPriorityGlobalQueue {

return backgroundPriorityGlobalQueue;

}

+ (void)initialize {

/**

Initializes the class before it receives its first message.

1. The runtime sends the initialize message to classes in a

thread-safe manner.

2. initialize is invoked only once per class. If you want to

perform independent initialization for the class and for

categories of the class, you should implement load methods.

if (self == [GCDQueue self])
{

mainQueue = [GCDQueue new];

mainQueue.dispatchQueue = \

dispatch_get_main_queue();

globalQueue = [GCDQueue new];

globalQueue.dispatchQueue = \

);

highPriorityGlobalQueue = [GCDQueue new];

highPriorityGlobalQueue.dispatchQueue = \

);

lowPriorityGlobalQueue = [GCDQueue new];

lowPriorityGlobalQueue.dispatchQueue = \

);

backgroundPriorityGlobalQueue = [GCDQueue new];

backgroundPriorityGlobalQueue.dispatchQueue = \

);

}

- (instancetype)init {

return [self initSerial];

}

- (instancetype)initSerial {

self = [super init];

if (self)

{

self.dispatchQueue = dispatch_queue_create(nil, DISPATCH_QUEUE_SERIAL);

}

return self;

}

- (instancetype)initConcurrent {

self = [super init];

if (self)

{

self.dispatchQueue = dispatch_queue_create(nil, DISPATCH_QUEUE_CONCURRENT);

}

return self;

}

- (void)execute:(dispatch_block_t)block {

dispatch_async(self.dispatchQueue, block);

}

- (void)execute:(dispatch_block_t)block afterDelay:(int64_t)delta
{

// NSEC_PER_SEC

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, delta), self.dispatchQueue,
block);

}

- (void)waitExecute:(dispatch_block_t)block {

As an optimization, this function invokes the block on

the current thread when possible.

作为一个建议,这种方法尽量在当前线程池中调用.

dispatch_sync(self.dispatchQueue, block);

}

- (void)barrierExecute:(dispatch_block_t)block {

The queue you specify should be a concurrent queue that you

create yourself using the dispatch_queue_create function.

If the queue you pass to this function is a serial queue or

one of the global concurrent queues, this function behaves

like the dispatch_async function.

使用的线程池应该是你自己创建的并发线程池.假设你传进来的參数为串行线程池

或者是系统的并发线程池中的某一个,这种方法就会被当做一个普通的async操作

dispatch_barrier_async(self.dispatchQueue,
block);

}

- (void)waitBarrierExecute:(dispatch_block_t)block {

The queue you specify should be a concurrent queue that you

create yourself using the dispatch_queue_create function.

If the queue you pass to this function is a serial queue or

one of the global concurrent queues, this function behaves

like the dispatch_sync function.

使用的线程池应该是你自己创建的并发线程池.假设你传进来的參数为串行线程池

或者是系统的并发线程池中的某一个,这种方法就会被当做一个普通的sync操作

As an optimization, this function invokes the barrier block

on the current thread when possible.

作为一个建议,这种方法尽量在当前线程池中调用.

dispatch_barrier_sync(self.dispatchQueue,
block);

}

- (void)suspend {

dispatch_suspend(self.dispatchQueue);

}

- (void)resume {

dispatch_resume(self.dispatchQueue);

}

- (void)execute:(dispatch_block_t)block inGroup:(GCDGroup *)group
{

dispatch_group_async(group.dispatchGroup, self.dispatchQueue,
block);

}

- (void)notify:(dispatch_block_t)block inGroup:(GCDGroup *)group
{

dispatch_group_notify(group.dispatchGroup, self.dispatchQueue,
block);

}

#pragma mark - 便利的构造方法

+ (void)executeInMainQueue:(dispatch_block_t)block afterDelaySecs:(NSTimeInterval)sec
{

[[GCDQueue mainQueue] execute:^{

block();