//
//  QueueTestController.swift
//  GCDDemo
//
//  Created by shangkun on 2018/4/29.
//  Copyright ? 2018 J1. All rights reserved.
//

import UIKit

@objc class QueueTestController: UITableViewController {
    
    //    除了主隊(duì)列以外的所有異步執(zhí)行都會(huì)新建線程, 并發(fā)執(zhí)行。
    //    在主隊(duì)列下的任務(wù)不管是異步任務(wù)還是同步任務(wù)都不會(huì)開辟線程囤踩，任務(wù)只會(huì)在主線程順序執(zhí)行袜硫。
    //    serial將會(huì)執(zhí)行完一個(gè)任務(wù)才會(huì)開始下一個(gè)眯亦，
    //    concurrent觸發(fā)完一個(gè)就立即進(jìn)入下一個(gè)，而不管它是否已完成宠能。
    
    lazy var scenes = [
        [
            "title":"主隊(duì)列，同步 -> 1 死鎖",
            "action":"mainQueueSync"
        ],
        [
            "title":"主隊(duì)列，異步 -> 132 沒有開啟新線程",
            "action":"mainQueueAsync"
        ], [
            "title":"串行隊(duì)列牢贸，同步 -> 123 順序執(zhí)行，沒有開啟新線程",
            "action":"serialQueueSync"
        ],
           [
            "title":"串行隊(duì)列镐捧，異步 -> 132 并發(fā)執(zhí)行潜索，開啟新線程",
            "action":"serialQueueAsync"
        ],  [
            "title":"并行隊(duì)列，同步 -> 123 順序執(zhí)行懂酱，沒有開啟新線程",
            "action":"concurrentQueueSync"
        ],
            [
                "title":"并行隊(duì)列竹习，異步 -> 132 并發(fā)執(zhí)行，開啟新線程",
                "action":"concurrentQueueAsync"
        ],
    ]
    
    override func viewDidLoad() {
        super.viewDidLoad()
        title = "queue"
        tableView.register(UITableViewCell.classForCoder(), forCellReuseIdentifier: "reuseIdentifier")
    }
    
    @objc func mainQueueSync() {
        
        print("1 \(Thread.current)")
        let queue = DispatchQueue.main
        queue.sync {
            print("2  \(Thread.current)")
        }
        print("3 \(Thread.current)")
        
        /*  發(fā)生死鎖列牺，程序崩潰
         主隊(duì)列的同步線程整陌，按照FIFO的原則（先入先出），2排在3后面會(huì)等3執(zhí)行完瞎领，但因?yàn)橥骄€程泌辫，3又要等2執(zhí)行完，相互等待成為死鎖九默。
         
         1 <NSThread: 0x282a43080>{number = 1, name = main}
         */
    }
    
    @objc func mainQueueAsync() {
        
        print("1 \(Thread.current)")
        let queue = DispatchQueue.main
        queue.async {
            for j in 0...10 {
                print("2 j=\(j) \(Thread.current)")
            }
        }
        print("3 \(Thread.current)")
        
        /*
         主線程順序執(zhí)行震放，異步實(shí)現(xiàn)最后執(zhí)行，也在主線程中
         沒有開啟新線程
         
         1 <NSThread: 0x281113080>{number = 1, name = main}
         3 <NSThread: 0x281113080>{number = 1, name = main}
         2 j=0 <NSThread: 0x281113080>{number = 1, name = main}
         2 j=1 <NSThread: 0x281113080>{number = 1, name = main}
         2 j=2 <NSThread: 0x281113080>{number = 1, name = main}
         2 j=3 <NSThread: 0x281113080>{number = 1, name = main}
         2 j=4 <NSThread: 0x281113080>{number = 1, name = main}
         2 j=5 <NSThread: 0x281113080>{number = 1, name = main}
         2 j=6 <NSThread: 0x281113080>{number = 1, name = main}
         2 j=7 <NSThread: 0x281113080>{number = 1, name = main}
         2 j=8 <NSThread: 0x281113080>{number = 1, name = main}
         2 j=9 <NSThread: 0x281113080>{number = 1, name = main}
         2 j=10 <NSThread: 0x281113080>{number = 1, name = main}
         */
    }
    
    @objc func serialQueueSync() {
        
        print("1 \(Thread.current)")
        let queue = DispatchQueue.init(label: "serialQueueSync")
        queue.sync {
            for i in 0...5 {
                print("2 i=\(i) \(Thread.current)")
            }
        }
        queue.sync {
            for j in 0...5 {
                print("2 j=\(j) \(Thread.current)")
            }
        }
        print("3 \(Thread.current)")
        
        /*
         順序執(zhí)行驼修，在主線程中
         沒有開啟新線程
         
         1 <NSThread: 0x282b97080>{number = 1, name = main}
         2 i=0 <NSThread: 0x282b97080>{number = 1, name = main}
         2 i=1 <NSThread: 0x282b97080>{number = 1, name = main}
         2 i=2 <NSThread: 0x282b97080>{number = 1, name = main}
         2 i=3 <NSThread: 0x282b97080>{number = 1, name = main}
         2 i=4 <NSThread: 0x282b97080>{number = 1, name = main}
         2 i=5 <NSThread: 0x282b97080>{number = 1, name = main}
         2 j=0 <NSThread: 0x282b97080>{number = 1, name = main}
         2 j=1 <NSThread: 0x282b97080>{number = 1, name = main}
         2 j=2 <NSThread: 0x282b97080>{number = 1, name = main}
         2 j=3 <NSThread: 0x282b97080>{number = 1, name = main}
         2 j=4 <NSThread: 0x282b97080>{number = 1, name = main}
         2 j=5 <NSThread: 0x282b97080>{number = 1, name = main}
         3 <NSThread: 0x282b97080>{number = 1, name = main}
         
         */
    }
    
    @objc func serialQueueAsync() {
        
        print("1 \(Thread.current)")
        let queue = DispatchQueue.init(label: "serialQueueAsync")
        queue.async {
            for i in 0...5 {
                print("2 i=\(i) \(Thread.current)")
            }
        }
        queue.async {
            for j in 0...5 {
                print("2 j=\(j) \(Thread.current)")
            }
        }
        print("3 \(Thread.current)")
        
        /*
         并發(fā)執(zhí)行殿遂。 不在主線程
         開啟新線程
         
         1 <NSThread: 0x280466b00>{number = 1, name = main}
         3 <NSThread: 0x280466b00>{number = 1, name = main}
         2 i=0 <NSThread: 0x28040e3c0>{number = 3, name = (null)}
         2 i=1 <NSThread: 0x28040e3c0>{number = 3, name = (null)}
         2 i=2 <NSThread: 0x28040e3c0>{number = 3, name = (null)}
         2 i=3 <NSThread: 0x28040e3c0>{number = 3, name = (null)}
         2 i=4 <NSThread: 0x28040e3c0>{number = 3, name = (null)}
         2 i=5 <NSThread: 0x28040e3c0>{number = 3, name = (null)}
         2 j=0 <NSThread: 0x28040e3c0>{number = 3, name = (null)}
         2 j=1 <NSThread: 0x28040e3c0>{number = 3, name = (null)}
         2 j=2 <NSThread: 0x28040e3c0>{number = 3, name = (null)}
         2 j=3 <NSThread: 0x28040e3c0>{number = 3, name = (null)}
         2 j=4 <NSThread: 0x28040e3c0>{number = 3, name = (null)}
         2 j=5 <NSThread: 0x28040e3c0>{number = 3, name = (null)}
         
         */
    }
    
    @objc func concurrentQueueSync() {
        
        print("1 \(Thread.current)")
        let queue = DispatchQueue.init(label: "concurrentQueueSync", attributes: .concurrent)
        queue.sync {
            for i in 0...5 {
                print("2 i=\(i) \(Thread.current)")
            }
        }
        queue.sync {
            for j in 0...5 {
                print("2 j=\(j) \(Thread.current)")
            }
        }
        print("3 \(Thread.current)")
        
        /*
         順序執(zhí)行诈铛，在主線程中
         沒有開啟新線程
         
         1 <NSThread: 0x2800b2940>{number = 1, name = main}
         2 i=0 <NSThread: 0x2800b2940>{number = 1, name = main}
         2 i=1 <NSThread: 0x2800b2940>{number = 1, name = main}
         2 i=2 <NSThread: 0x2800b2940>{number = 1, name = main}
         2 i=3 <NSThread: 0x2800b2940>{number = 1, name = main}
         2 i=4 <NSThread: 0x2800b2940>{number = 1, name = main}
         2 i=5 <NSThread: 0x2800b2940>{number = 1, name = main}
         2 j=0 <NSThread: 0x2800b2940>{number = 1, name = main}
         2 j=1 <NSThread: 0x2800b2940>{number = 1, name = main}
         2 j=2 <NSThread: 0x2800b2940>{number = 1, name = main}
         2 j=3 <NSThread: 0x2800b2940>{number = 1, name = main}
         2 j=4 <NSThread: 0x2800b2940>{number = 1, name = main}
         2 j=5 <NSThread: 0x2800b2940>{number = 1, name = main}
         3 <NSThread: 0x2800b2940>{number = 1, name = main}
         
         */
    }
    
    @objc func concurrentQueueAsync() {
        
        print("1 \(Thread.current)")
        let queue = DispatchQueue.init(label: "concurrentQueueAsync")
        queue.async {
            for i in 0...5 {
                print("2 i=\(i) \(Thread.current)")
            }
        }
        queue.async {
            for j in 0...5 {
                print("2 j=\(j) \(Thread.current)")
            }
        }
        print("3 \(Thread.current)")
        
        /*
         并發(fā)執(zhí)行。 不在主線程
         開啟新線程
         
         1 <NSThread: 0x2800b2940>{number = 1, name = main}
         3 <NSThread: 0x2800b2940>{number = 1, name = main}
         2 i=0 <NSThread: 0x2800ece00>{number = 6, name = (null)}
         2 i=1 <NSThread: 0x2800ece00>{number = 6, name = (null)}
         2 i=2 <NSThread: 0x2800ece00>{number = 6, name = (null)}
         2 i=3 <NSThread: 0x2800ece00>{number = 6, name = (null)}
         2 i=4 <NSThread: 0x2800ece00>{number = 6, name = (null)}
         2 i=5 <NSThread: 0x2800ece00>{number = 6, name = (null)}
         2 j=0 <NSThread: 0x2800ece00>{number = 6, name = (null)}
         2 j=1 <NSThread: 0x2800ece00>{number = 6, name = (null)}
         2 j=2 <NSThread: 0x2800ece00>{number = 6, name = (null)}
         2 j=3 <NSThread: 0x2800ece00>{number = 6, name = (null)}
         2 j=4 <NSThread: 0x2800ece00>{number = 6, name = (null)}
         2 j=5 <NSThread: 0x2800ece00>{number = 6, name = (null)}
         
         */
    }
    
    // MARK: - Table view data source
    
    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return scenes.count
    }
    
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "reuseIdentifier", for: indexPath)
        cell.textLabel?.text = scenes[indexPath.item]["title"]
        return cell
    }
    
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        if let function = scenes[indexPath.item]["action"] {
            let selector = Selector(function)
            if self.responds(to: selector) {
                perform(selector)
            }
        }
    }
}