线程2 NSOperation 抽像类的使用

//
//  ZYOperationViewController.h
//  Thread
//
//  Created by yejiong on 14

//
//  ZYOperation.h
//  Thread
//
//  Created by yejiong on 14/11/4.
//  Copyright © 2014年 zzz. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface ZYOperation : NSOperation

@property (nonatomic, copy) NSString* operationName;

@end

//
//  ZYOperation.m
//  Thread
//
//  Created by yejiong on 14/11/4.
//  Copyright © 2014年 zzz. All rights reserved.
//

#import "ZYOperation.h"

@implementation ZYOperation

- (void)dealloc {
    [_operationName release];

    [super dealloc];
}

//重写 main 方法，在这里写入我们需要在线程中执行的代码。
- (void)main {
//    NSLog(@"--------%@", [NSThread currentThread]);
//
//    if ([NSThread isMainThread]) {
//        NSLog(@"主线程");
//    }else {
//        NSLog(@"分线程");
//    }

    NSLog(@"%@", _operationName);
}

@end

/11/4.
//  Copyright © 2014年 zzz. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ZYOperationViewController : UIViewController

@end

//
//  ZYOperationViewController.m
//  Thread
//
//  Created by yejiong on 14/11/4.
//  Copyright © 2014年 zzz. All rights reserved.
//

#import "ZYOperationViewController.h"
#import "ZYOperation.h"

@interface ZYOperationViewController () {
    NSOperationQueue* _operationQueue;

}

@property (nonatomic, retain) NSBlockOperation* blockOperation1;

@end

@implementation ZYOperationViewController

- (void)dealloc {
    [_operationQueue release];

    [_blockOperation1 release];

    [super dealloc];
}

- (void)viewDidLoad {
    self.view.backgroundColor = [UIColor whiteColor];

    _operationQueue = [[NSOperationQueue alloc] init];

    //设置最大并发数，同时最多有多少线程在执行。
    _operationQueue.maxConcurrentOperationCount = ;

    //使用 NSBlockOperation 的时候需要注意是否造成循环引用。
    __block ZYOperationViewController* blockSelf = self;

    self.blockOperation1 = [NSBlockOperation blockOperationWithBlock:^{
        blockSelf.view.backgroundColor = [UIColor redColor];
    }];

    //没有造成循环引用。
    NSBlockOperation* blockOperation = [NSBlockOperation blockOperationWithBlock:^{
        self.view.backgroundColor = [UIColor redColor];
    }];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    //NSOperation 是一个抽象类，我们不能使用它的对象，必须使用它子类的对象。
    //系统提供了两个子类：NSInvocationOperation，NSBlockOperation。
    //我们也可以自定义 NSOperation 子类，重写 mian 方法，然后把 operation 对象添加到 NSOperationQueue 中，就会自动在分线程执行 main 方法。

//    [self invocationOperation];

//    [self blockOperation];
    
//自定义
    [self customOperation];
}

- (void)invocationOperation {
    NSInvocationOperation* invocationOperation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(run:) object:@""];

    //使用 start 在主线程执行任务。
//    [invocationOperation start];

    //如果需要在分线程执行任务，把对象添加到 NSOperationQueue，就会自动的在分线程执行任务。

    [_operationQueue addOperation:invocationOperation];

    [invocationOperation release];
}

- (void)blockOperation {
    NSBlockOperation* blockOperation = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"1--------%@", [NSThread currentThread]);

        if ([NSThread isMainThread]) {
            NSLog(@"主线程");
        }else {
            NSLog(@"分线程");
        }
    }];

    //主线程
//    [blockOperation start];

    //分线程
//    [_operationQueue addOperation:blockOperation];

    [blockOperation addExecutionBlock:^{
        NSLog(@"2--------%@", [NSThread currentThread]);

        if ([NSThread isMainThread]) {
            NSLog(@"主线程");
        }else {
            NSLog(@"分线程");
        }
    }];

    [blockOperation addExecutionBlock:^{
        NSLog(@"3--------%@", [NSThread currentThread]);

        if ([NSThread isMainThread]) {
            NSLog(@"主线程");
        }else {
            NSLog(@"分线程");
        }
    }];

    [blockOperation addExecutionBlock:^{
        NSLog(@"4--------%@", [NSThread currentThread]);

        if ([NSThread isMainThread]) {
            NSLog(@"主线程");
        }else {
            NSLog(@"分线程");
        }
    }];

    [blockOperation addExecutionBlock:^{
        NSLog(@"5--------%@", [NSThread currentThread]);

        if ([NSThread isMainThread]) {
            NSLog(@"主线程");
        }else {
            NSLog(@"分线程");
        }
    }];

    //addExecutionBlock，并发的执行多个 block 任务，系统自动分配到当前空闲的线程，可能是主线程也可能是分线程。
//    [blockOperation start];

    //全部在分线程并发执行。
    [_operationQueue addOperation:blockOperation];
}

- (void)customOperation {
    ZYOperation* operation = [[ZYOperation alloc] init];

    operation.operationName = @"";

    ZYOperation* operation1 = [[ZYOperation alloc] init];

    operation1.operationName = @"";

    ZYOperation* operation2 = [[ZYOperation alloc] init];

    operation2.operationName = @"";

    //设置线程间的依赖关系。让一个线程等待另外一个线程执行完毕再开始执行。
    [operation addDependency:operation1];

    [_operationQueue addOperation:operation];
    [_operationQueue addOperation:operation1];
    [_operationQueue addOperation:operation2];

    [operation release];
    [operation1 release];
    [operation2 release];

}

- (void)run:(id)object {
    NSLog(@"%@", object);

    if ([NSThread isMainThread]) {
        NSLog(@"主线程");
    }else {
        NSLog(@"分线程");
    }

    //仍然使用这个方法回到主线程。
//    self performSelectorOnMainThread:<#(nonnull SEL)#> withObject:<#(nullable id)#> waitUntilDone:<#(BOOL)#>
}

@end