WCF 项目应用连载[8] - 绑定、服务、行为 大数据传输与限流 - 下 (ServiceThrottlingAttribute)

因为ORM的原因，对Attribute编程有一种情节。。所以这节的出现，完全是因为在WCF对自定义Attribute的一种应用。

WCF 项目应用连载[7] - 绑定、服务、行为 大数据传输与限流 - 上

前面一节已经讲得差不多够了。

对WCF的限流，这节，提供一个类。ServiceThrottlingAttribute

让你以硬编码方式使用WCF服务限流

 

    [ServiceThrottling(50,200,100)]

    [ServiceContract(CallbackContract = typeof(ILigAgentCallback))]

    public interface ILigAgent

 

 

 

public class ServiceThrottlingAttribute : Attribute,IServiceBehavior

    {

        #region Constructors

        public ServiceThrottlingAttribute()

            : this(defaultCalls, defaultInstances, defaultSession)

        {

        }



        public ServiceThrottlingAttribute(int maxCalls, int maxInstances, int maxSessions)

        {

            this.Initialize(maxCalls, maxInstances, maxSessions);

        }

        #endregion



        #region Interfaces

        /// <summary>

        /// 

        /// </summary>

        /// <param name="serviceDescriptiong"></param>

        /// <param name="serviceHostBase"></param>

        /// <param name="endpoints"></param>

        /// <param name="bindingParameters"></param>

        void IServiceBehavior.AddBindingParameters(ServiceDescription serviceDescriptiong, ServiceHostBase serviceHostBase,

            Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters)

        {

        }



        /// <summary>

        /// 

        /// </summary>

        /// <param name="serviceDescription"></param>

        /// <param name="serviceHostBase"></param>

        void IServiceBehavior.ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)

        {

            ServiceThrottlingBehavior tbehavior = serviceDescription.Behaviors.Find<ServiceThrottlingBehavior>();

            if (tbehavior == null)

            {

                serviceDescription.Behaviors.Add(this.throttlingBehavior);

            }

        }



        /// <summary>

        /// 

        /// </summary>

        /// <param name="serviceDescription"></param>

        /// <param name="serviceHostBase"></param>

        void IServiceBehavior.Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)

        {



        }

        #endregion



        #region Private Helpers

        private void Initialize(int maxCalls, int maxInstances, int maxSessions)

        {

            this.throttlingBehavior = new ServiceThrottlingBehavior();

            this.throttlingBehavior.MaxConcurrentCalls = maxCalls;

            this.throttlingBehavior.MaxConcurrentInstances = maxInstances;

            this.throttlingBehavior.MaxConcurrentSessions = maxSessions;

        }

        #endregion



        #region Fields

        private const int defaultThrottling = 50;

        private const int defaultCalls = 50;

        private const int defaultInstances = 200;

        private const int defaultSession = 100;

        private ServiceThrottlingBehavior throttlingBehavior = null;

        #endregion

    }