C# RemotingServices.GetLifetimeService方法代碼示例

//引入命名空間
using System;
using System.Collections;
using System.Net.Sockets;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Http;
using System.Runtime.Remoting.Messaging;
using System.Runtime.Remoting.Lifetime;
using System.Security.Permissions;
using TimerSample;

namespace GroupCoffeeTimer {
    public class TimerClient : MarshalByRefObject, ISponsor {
        public static void Main() {
            TimerClient myClient = new TimerClient();
        }

        [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.Infrastructure)]
        public TimerClient() {
            // Registers the HTTP Channel so that this client can receive
            // events from the remote service.

            BinaryServerFormatterSinkProvider serverProv = new BinaryServerFormatterSinkProvider();
            serverProv.TypeFilterLevel = System.Runtime.Serialization.Formatters.TypeFilterLevel.Full;
            BinaryClientFormatterSinkProvider clientProv = new BinaryClientFormatterSinkProvider();

            IDictionary props = new Hashtable();
            props["port"] = 0;
            HttpChannel channel = new HttpChannel(props, clientProv, serverProv);
            ChannelServices.RegisterChannel(channel);

            WellKnownClientTypeEntry remoteType = new WellKnownClientTypeEntry(typeof(TimerService), "http://localhost:9000/MyService/TimerService.soap");
            RemotingConfiguration.RegisterWellKnownClientType(remoteType);
            
            TimerService groupTimer = new TimerService();
            groupTimer.MinutesToTime = 4.0; 

            // Registers this client as a lease sponsor so that it can
            // prevent the expiration of the TimerService.
            ILease leaseObject = (ILease)RemotingServices.GetLifetimeService(groupTimer);
            leaseObject.Register(this);
            
            // Subscribes to the event so that the client can receive notifications from the server.
            groupTimer.TimerExpired += new TimerExpiredEventHandler(OnTimerExpired);
            Console.WriteLine("Connected to TimerExpired event");
            
            groupTimer.Start();
            Console.WriteLine("Timer started for {0} minutes.", groupTimer.MinutesToTime);
            Console.WriteLine("Press enter to end the client process.");
            Console.ReadLine();
        }
        
        private void OnTimerExpired (object source, TimerServiceEventArgs e) {
            Console.WriteLine("TimerHelper.OnTimerExpired: {0}", e.Message);
        }

        [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.Infrastructure)]
        public TimeSpan Renewal(ILease lease) {
            Console.WriteLine("TimerClient: Renewal called.");
            return TimeSpan.FromMinutes(0.5);
        }
    }
}

//引入命名空間
using System;
using System.Collections;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using System.Runtime.Remoting.Channels.Http;
using System.Runtime.Remoting.Lifetime;
using System.Timers;

namespace TimerSample {
    public class TimerServer {
        public static void Main() {

            BinaryServerFormatterSinkProvider serverProv = new BinaryServerFormatterSinkProvider();
            serverProv.TypeFilterLevel = System.Runtime.Serialization.Formatters.TypeFilterLevel.Full;
            BinaryClientFormatterSinkProvider clientProv = new BinaryClientFormatterSinkProvider();

            IDictionary props = new Hashtable();
            props["port"] = 9000;
            HttpChannel channel = new HttpChannel(props, clientProv, serverProv);
            ChannelServices.RegisterChannel(channel);
            RemotingConfiguration.RegisterWellKnownServiceType(
                                        typeof(TimerService), 
                                        "MyService/TimerService.soap",
                                        WellKnownObjectMode.Singleton);
            
            Console.WriteLine("Press enter to end the server process.");
            Console.ReadLine();
        }
    }
}

//引入命名空間
using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using System.Runtime.Remoting.Channels.Http;
using System.Runtime.Remoting.Lifetime;
using System.Security.Permissions;
using System.Timers;

namespace TimerSample {
    // Define the event arguments
    [Serializable]
    public class TimerServiceEventArgs : EventArgs {
        private string m_Message;
        public TimerServiceEventArgs(string message) {
            m_Message = message;
        }

        public string Message {
            get {
                return m_Message;
            }
        }
    }
    
    // Define the delegate for the event
    public delegate void TimerExpiredEventHandler (object sender, TimerServiceEventArgs e);

    // Define the remote service class
    public class TimerService : MarshalByRefObject {
        private double m_MinutesToTime;
        private Timer m_Timer;

        // The client will subscribe and unsubscribe to this event
        public event TimerExpiredEventHandler TimerExpired;

        // Default: Initialize the TimerService to 4 minutes, the time required
        // to brew coffee in a French Press.
        public TimerService():this(4.0) {
        }
        
        public TimerService(double minutes) {
            Console.WriteLine("TimerService instantiated.");
            m_MinutesToTime = minutes;
            m_Timer = new Timer();
            m_Timer.Elapsed += new ElapsedEventHandler(OnElapsed);
        }
        
        public double MinutesToTime {
            get {
                return m_MinutesToTime;
            }
            set {
                m_MinutesToTime = value;
            }
        }

        public void Start() {
            if(!m_Timer.Enabled) {
                TimeSpan interval = TimeSpan.FromMinutes(m_MinutesToTime);
                m_Timer.Interval = interval.TotalMilliseconds;
                m_Timer.Enabled = true;
            }
            else {
                // TODO: Raise an exception
            }
        }
        
        private void OnElapsed(object source, ElapsedEventArgs e) {
            m_Timer.Enabled = false;

            // Fire Event
            if (TimerExpired != null) {
                // Package String in TimerServiceEventArgs
                TimerServiceEventArgs timerEventArgs = new TimerServiceEventArgs("TimerServiceEventArgs: Timer Expired.");
                Console.WriteLine("Firing TimerExpired Event");
                TimerExpired(this, timerEventArgs);
            }
        }

        [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.Infrastructure)]
        public override Object InitializeLifetimeService() {
            ILease lease = (ILease)base.InitializeLifetimeService();
            if (lease.CurrentState == LeaseState.Initial) {
                lease.InitialLeaseTime = TimeSpan.FromMinutes(0.125);
                lease.SponsorshipTimeout = TimeSpan.FromMinutes(2);
                lease.RenewOnCallTime = TimeSpan.FromSeconds(2);
                Console.WriteLine("TimerService: InitializeLifetimeService");
            }
             return lease;
        }
    }
}