跨平台开源通讯组件elastic communication

　　　　elastic communication是基于c#开发支持.net和mono的通讯组件（简称EC），EC的主要目的简化mono和.net下的通讯开发难度，通过EC可以非常快速地开发基于mono和.net的通讯交互应用。EC抽取的基础的通讯协议默认支持protobuf，msgpack的数据对象进行通讯交互，开发者不可以根据自己的制要制订更多的序列化方式支持；EC不紧紧支持简单的对像传输，还提供了控制器，方法控制器和更方便的远程接口调用功能。

　　　　以下是ES希望实现的最终目标

　　　　借助于Xamarin实现不同移动端的实现，由于这一块个人工作原因还没细化实现，通过开源相关代码可以让感兴趣的人更好进一步去完成相关功能。

功能简介

　　　　EC实现通讯功能是非常方便的事情，下面通讯简单的几种场景来介绍一下EC在通讯上的应用。

HelloWord

服务端

namespace HelloWord.Server
{
    [Controller] public class Program
    { static void Main(string[] args)
        {
            ECServer.Open();
            System.Threading.Thread.Sleep(-1);
        } public string HelloWord(ISession session,Hello e)
        { return string.Format("hello {0} [say time:{1}]", e.Name, DateTime.Now);
        }
    }

    [MessageID(0x1)]
    [ProtoContract] public class Hello
    {
        [ProtoMember(1)] public string Name { get; set; }
    }
}

客户端

private EC.ProtoSyncClient mClient = new ProtoSyncClient("127.0.0.1");
mClient.Send<string>(new Hello { Name=textBox1.Text })

远程方法访问

　　EC支持远程方法调用，如果用过wcf那对这功能感觉应该不会陌生，而EC也是通过接口的方式来定义远程调用行为；wcf同一方法重载需要重新定义名称，而ec则支持同一方法多个重载版本。为了满足更复杂的需要，EC的远程调用同样支持out和ref参数。

接口定义

namespace Remoting.Service
{ public interface IUserService
    {
        User Register(string name, string email);
    }
}

服务端

[SOAService(typeof(Service.IUserService))] class Program : IUserService
    { static void Main(string[] args)
        { ECServer.Open();
            System.Threading.Thread.Sleep(-1);
        } public Service.User Register(string name, string email)
        {
            User user = new User();
            user.EMail = email;
            user.Name = name;
            user.CreateTime = DateTime.Now; return user;
        }
    }

客户端

public partial class Form1 : Form
    { public Form1()
        {
            InitializeComponent();
        } private ProtoClient mClient = new ProtoClient("192.168.7.111"); private IUserService UserService; private void Form1_Load(object sender, EventArgs e)
        {
            UserService = mClient.CreateInstance<IUserService>();
        } private void cmdRegister_Click(object sender, EventArgs e)
        {
            User user= UserService.Register(txtName.Text, txtEMail.Text);
            txtCreateTime.Text = user.CreateTime.ToString();
        }
    }

数据访问示例

　　数据访问应该是最常见的一种应用场，以下是定义一个简单的数据查询示例。

服务端

 [EC.Controller] public class Program
    { static void Main(string[] args)
        {
            DBContext.SetConnectionDriver<SqliteDriver>(DB.DB1);
            DBContext.SetConnectionString(DB.DB1, "Data Source=northwindEF.db;Pooling=true;FailIfMissing=false;");
            ECServer.Open();
            System.Threading.Thread.Sleep(-1);
        } public IList<Employee> OnEmployeeSearch(ISession session, EmployeeSearch e)
        { return new Expression().List<Models.Employees, Employee>();
        } public IList<Customer> OnCustomerSearch(ISession session, CustomerSearch e)
        { return new Expression().List<Models.Customers, Customer>();
        } public IList<Order> OnOrderSearch(ISession session, OrderSearch e)
        {
            Expression exp = new Expression(); if (e.CustomerID != null)
                exp &= Models.Orders.customerID == e.CustomerID; if (e.EmployeeID > 0)
                exp &= Models.Orders.employeeID == e.EmployeeID; return exp.List<Models.Orders, Order>();
        } public IList<OrderDetail> GetOrderDetail(ISession session, GetDetail e)
        {
            Expression exp = Models.OrderDetails.orderID == e.OrderID;
            JoinTable jt = Models.OrderDetails.productID.InnerJoin(Models.Products.productID);
            jt.Select("OrderDetails.*", Models.Products.productName.Name); return exp.List<OrderDetail>(jt);
        }

    }

客户端

private ProtoSyncClient mClient = new ProtoSyncClient("127.0.0.1"); private void FrmMain_Load(object sender, EventArgs e)
        {
            cbEmployees.Items.Add(new Employee()); foreach (Employee item in mClient.Send<IList<Employee>>(new EmployeeSearch()))
            {
                cbEmployees.Items.Add(item);
            }
            cbCustomers.Items.Add(new Customer()); foreach (Customer item in mClient.Send<IList<Customer>>(new CustomerSearch()))
            {
                cbCustomers.Items.Add(item);
            }
            
        } private void cmdSearch_Click(object sender, EventArgs e)
        {
            OrderSearch os = new OrderSearch(); if (cbCustomers.SelectedItem != null)
                os.CustomerID = ((Customer)cbCustomers.SelectedItem).CustomerID; if (cbEmployees.SelectedItem != null)
                os.EmployeeID = ((Employee)cbEmployees.SelectedItem).EmployeeID;
            gdOrder.DataSource = mClient.Send<IList<Order>>(os);
        } private void gdOrder_SelectionChanged(object sender, EventArgs e)
        { if (gdOrder.SelectedRows.Count > 0)
            {
                Order order = (Order)gdOrder.SelectedRows[0].DataBoundItem;
                GetDetail getdetail = new GetDetail();
                getdetail.OrderID = order.OrderID;
                gdDetail.DataSource = mClient.Send<IList<OrderDetail>>(getdetail);
            }
        }

AppModule

　　　　AppModule类似于asp.net的httpModule，它可以在EC服务中载实始化的时候进行加载，通过AppModule可以实现消息处理，处理日志，全局信息定义等相关主要功能。

public class FilterModel : IAppModel
    { public string Name
        { get { return "Filter"; }
        } private System.Threading.Timer mTimer; public void Init(IApplication application)
        { //application.Filters.Add(new LoginFilter()); application.Disconnected += (o, e) => { "{0} disposed applicaion event".Log4Info(e.Session.Channel.EndPoint);

            };
            application.Connected += (o, e) => { "{0} connect applicaion event".Log4Info(e.ChannelConnectArgs.Channel.EndPoint);

            };
              application.SendCompleted += (o, e) => { "{0} send completed applicaion event".Log4Info(e.Session.Channel.EndPoint);
              };
             application.MethodProcess += (o, e) => { //application e.Application["Path"] = @"c:\"; //sexxion e.Session["folder"] = "aaa";
             };
            application.Error += (o, e) => { "{0} channel error {1}".Log4Error(e.Info.Channel.EndPoint, e.Info.Error.Message);
            };
            mTimer = new System.Threading.Timer(o => {
                application.Server.Send(new User { Name = Guid.NewGuid().ToString("N"),CreateTime = DateTime.Now }, application.Server.GetOnlines());
            }, null, 1000, 1000);

        } public string Command(string cmd)
        { throw new NotImplementedException();
        }
    }

Filter

　　　　这个特性在EC上是提供比较有用的功能，通讯filter可以对调用方法加入权限，日志，拦载等逻辑功能。　　

public class AdminFilter : FilterAttribute
    { public override void Execute(IMethodContext context)
        { "admin filter ->{0}".Log4Debug(context.Handler); base.Execute(context);
        }
    }
    [Controller] public class Controller
    {
        [SkipFilter(typeof(LoginFilter))]
        [ThreadPool] public User Regisetr(ISession session, User user)
        {
            user.CreateTime = DateTime.Now; "Register invoke[Name:{0} Email:{1}]".Log4Debug(user.Name, user.EMail); return user;
        }

        [AdminFilter] public IList<User> Search(ISession session, Query query)
        { "Search invoke".Log4Debug();
            List<User> users = new List<User>();
            users.Add(new User());
            users.Add(new User()); return users;
        }
    }