C# 任务、线程、同步（五）

1、数据流使用  TPL Data Flow 类库

    class Program
    {
        static void Main(string[] args)
        {
           // ActionBlock();
           // SourceAndTargetBlocksSample();
            var target = SetupPipeline();
            target.Post("../../");
            Console.ReadLine();
         
        }
        #region  ActionBlock
        static void ActionBlock()
        {
            var processInput = new ActionBlock<string>(s => { Console.WriteLine("user input : {0}", s); });

            bool exit = false;

            while (!exit)
            {
                string input = Console.ReadLine();
                if (string.Compare(input, "exit", ignoreCase: true) == 0)
                {
                    exit = true;
                }
                else
                    processInput.Post(input);
            }
        }
        #endregion

        #region BufferBlock 
        static void SourceAndTargetBlocksSample()
        {
            Task t1 = Task.Run(() => Producer());
            Task t2 = Task.Run(() => Consumer());

            Task.WaitAll(t1, t2);
        }
        static BufferBlock<string> buffer = new BufferBlock<string>();
        static void Producer()
        {
            bool exit = false;
            while (!exit)
            {
                string input = Console.ReadLine();
                if (string.Compare(input, "exit", ignoreCase: true) == 0)
                {
                    exit = true;
                }
                else
                    buffer.Post(input);
            }       
        } 
        static async void Consumer()
        {
            while(true)
            {
                string data = await buffer.ReceiveAsync();
                Console.WriteLine("user input : {0} ", data);
            }
        }

        #endregion

        #region 管道使用
        static ITargetBlock<string> SetupPipeline()
        {
            var fileNamesForPath = new TransformBlock<string, IEnumerable<string>>(path => { return GetFileNames(path); });
            var lines = new TransformBlock<IEnumerable<string>, IEnumerable<string>>(fileNames => { return LoadLines(fileNames); });
            var words = new TransformBlock<IEnumerable<string>, IEnumerable<string>>(lines2 => { return GetWords(lines2); });

            var display = new ActionBlock<IEnumerable<string>>(coll =>
            {
                foreach (var item in coll)
                {
                    Console.WriteLine(item);
                }
            });

            fileNamesForPath.LinkTo(lines);
            lines.LinkTo(words);
            words.LinkTo(display);
            return fileNamesForPath;
        }
        static IEnumerable<string> GetFileNames(string path)
        {
            foreach (var item in Directory.EnumerateFiles(path,"*.cs"))
            {
                yield return item;   
            }
        }

        static IEnumerable<string> LoadLines(IEnumerable<string> fileName)
        {
            foreach (var item in fileName)
            {
                using(FileStream stream=File.OpenRead(item))
                {
                    var reader = new StreamReader(stream);
                    string line = null;
                    while((line=reader.ReadLine())!=null)
                    {
                        yield return line;
                    }
                }
            }
        }
        static IEnumerable<string> GetWords(IEnumerable<string> lines)
        {
            foreach (var item in lines)
            {
                string[] words = item.Split(' ', ';', '(', ')', '{', '}', '.', ',');
                foreach(var word in words)
                {
                    if (!string.IsNullOrEmpty(word))
                        yield return word;
                }
            }
        }

        #endregion 
    }