PeerApplication.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / SystemNet / Net / PeerToPeer / Collaboration / PeerApplication.cs / 1 / PeerApplication.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net.PeerToPeer.Collaboration 
{ 
    using System;
    using System.Collections; 
    using System.Collections.Generic;
    using System.Collections.ObjectModel;
    using System.Threading;
    using System.Runtime.InteropServices; 
    using System.Text;
    using System.Diagnostics; 
    using System.ComponentModel; 
    using System.Runtime.Serialization;
    using System.Security.Permissions; 

    /// 
    /// This class handles all the functionality and events associated with the Collaboration
    /// Peer Application 
    /// 
    [Serializable] 
    public class PeerApplication : IDisposable, IEquatable, ISerializable 
    {
        private const int c_16K = 16384; 
        private Guid m_id;
        private byte[] m_data;
        private string m_description;
        private string m_path; 
        private string m_commandLineArgs;
        private PeerScope m_peerScope; 
        private ISynchronizeInvoke m_synchronizingObject; 

        // 
        // Initialize on first access of this class
        //

        //  
        // 
        //  
        [System.Security.SecurityCritical] 
        static PeerApplication()
        { 
            CollaborationHelperFunctions.Initialize();
        }

        public PeerApplication(){} 

        public PeerApplication( Guid id, string description, byte[] data, string path, 
                                string commandLineArgs, PeerScope peerScope) 
        {
            if ((data != null) && (data.Length > c_16K)) 
                throw new ArgumentException(SR.GetString(SR.Collab_ApplicationDataSizeFailed), "data");

            m_id = id;
            m_description = description; 
            m_data = data;
            m_path = path; 
            m_commandLineArgs = commandLineArgs; 
            m_peerScope = peerScope;
        } 

        /// 
        /// Constructor to enable serialization
        ///  
        protected PeerApplication(SerializationInfo serializationInfo, StreamingContext streamingContext)
        { 
            m_id = (Guid) serializationInfo.GetValue("_Id", typeof(Guid)); 
            m_data = (byte []) serializationInfo.GetValue("_Data", typeof(byte[]));
            m_description = serializationInfo.GetString("_Description"); 
            m_path = serializationInfo.GetString("_Path");
            m_commandLineArgs = serializationInfo.GetString("_CommandLineArgs");
            m_peerScope = (PeerScope) serializationInfo.GetInt32("_Scope");
        } 

        public Guid Id 
        { 
            get {
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName); 

                return m_id;
            }
            set { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
 
                m_id = value; 
            }
        } 

        public byte[] Data
        {
            get { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
 
                return m_data; 
            }
            set { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);

                if ((value != null) && (value.Length > c_16K))
                    throw new ArgumentException(SR.GetString(SR.Collab_ApplicationDataSizeFailed)); 

                m_data = value; 
            } 
        }
 
        public string Description
        {
            get{
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName); 
                return m_description;
            } 
            set { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
 
                m_description = value;
            }
        }
 
        public string Path
        { 
            get { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
                return m_path; 
            }
            set {
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
                m_path = value; 
            }
        } 
 
        public string CommandLineArgs
        { 
            get {
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
                return m_commandLineArgs;
            } 
            set {
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName); 
                m_commandLineArgs = value; 
            }
        } 

        public PeerScope PeerScope
        {
            get { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
                return m_peerScope; 
            } 
            set {
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName); 
                m_peerScope = value;
            }
        }
 
        /// 
        /// Gets and set the object used to marshall event handlers calls for stand alone 
        /// events 
        /// 
        [Browsable(false), DefaultValue(null), Description(SR.SynchronizingObject)] 
        public ISynchronizeInvoke SynchronizingObject
        {
            get
            { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
                return m_synchronizingObject; 
            } 
            set
            { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
                m_synchronizingObject = value;
            }
        } 

        private event EventHandler m_applicationChanged; 
        public event EventHandler ApplicationChanged 
        {
            //  
            // 
            // 
            [System.Security.SecurityCritical]
            add 
            {
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName); 
 
                PeerCollaborationPermission.UnrestrictedPeerCollaborationPermission.Demand();
                AddApplicationChanged(value); 
            }
            // 
            // 
            //  
            [System.Security.SecurityCritical]
            remove 
            { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
 
                PeerCollaborationPermission.UnrestrictedPeerCollaborationPermission.Demand();
                RemoveApplicationChanged(value);
            }
        } 

        #region Application changed event variables 
        private object m_lockAppChangedEvent; 
        private object LockAppChangedEvent
        { 
            get{
                if (m_lockAppChangedEvent == null){
                    object o = new object();
                    Interlocked.CompareExchange(ref m_lockAppChangedEvent, o, null); 
                }
                return m_lockAppChangedEvent; 
            } 
        }
 
        private RegisteredWaitHandle m_regAppChangedWaitHandle;
        private AutoResetEvent m_appChangedEvent;
        private SafeCollabEvent m_safeAppChangedEvent;
        #endregion 

        //  
        //  
        // 
        //  
        // 
        // 
        // 
        //  
        // 
        //  
        [System.Security.SecurityCritical] 
        private void AddApplicationChanged(EventHandler callback)
        { 
            //
            // Register a wait handle if one has not been registered already
            //
 
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "AddApplicationChanged() called.");
 
            lock (LockAppChangedEvent){ 
                if (m_applicationChanged == null){
                    if (m_id.Equals(Guid.Empty)){ 
                        throw new PeerToPeerException("No application guid defined"); }

                    m_appChangedEvent = new AutoResetEvent(false);
 
                    //
                    // Register callback with a wait handle 
                    // 

                    m_regAppChangedWaitHandle = ThreadPool.RegisterWaitForSingleObject(m_appChangedEvent, //Event that triggers the callback 
                                            new WaitOrTimerCallback(ApplicationChangedCallback), //callback to be called
                                            null, //state to be passed
                                            -1,   //Timeout - aplicable only for timers
                                            false //call us everytime the event is set 
                                            );
                    PEER_COLLAB_EVENT_REGISTRATION pcer = new PEER_COLLAB_EVENT_REGISTRATION(); 
                    pcer.eventType = PeerCollabEventType.EndPointApplicationChanged; 

                    GUID guid = CollaborationHelperFunctions.ConvertGuidToGUID(m_id); 
                    GCHandle guidHandle = GCHandle.Alloc(guid, GCHandleType.Pinned);

                    pcer.pInstance = guidHandle.AddrOfPinnedObject();
 
                    //
                    // Register event with collab 
                    // 

                    try{ 
                        Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Registering event with App ID {0}", m_id.ToString());

                        int errorCode = UnsafeCollabNativeMethods.PeerCollabRegisterEvent(
                                                                            m_appChangedEvent.SafeWaitHandle, 
                                                                            1,
                                                                            ref pcer, 
                                                                            out m_safeAppChangedEvent); 
                        if (errorCode != 0){
                            Logging.P2PTraceSource.TraceEvent(TraceEventType.Error, 0, "PeerCollabRegisterEvent returned with errorcode {0}", errorCode); 
                            throw PeerToPeerException.CreateFromHr(SR.GetString(SR.Collab_ApplicationChangedRegFailed), errorCode);
                        }
                    }
                    finally{ 
                        if (guidHandle.IsAllocated)
                            guidHandle.Free(); 
                    } 
                }
                m_applicationChanged += callback; 
            }

            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "AddApplicationChanged() successful.");
 
        }
 
        //  
        // 
        //  
        // 
        [System.Security.SecurityCritical]
        private void RemoveApplicationChanged(EventHandler callback)
        { 
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "RemoveApplicationChanged() called.");
 
            lock (LockAppChangedEvent){ 
                m_applicationChanged -= callback;
                if (m_applicationChanged == null){ 
                    CollaborationHelperFunctions.CleanEventVars(ref m_regAppChangedWaitHandle,
                                                                ref m_safeAppChangedEvent,
                                                                ref m_appChangedEvent);
                    Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Clean ApplicationChanged variables successful."); 
                }
            } 
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "RemoveApplicationChanged() successful."); 
        }
 
        protected virtual void OnApplicationChanged(ApplicationChangedEventArgs appChangedArgs)
        {
            EventHandler handlerCopy = m_applicationChanged;
 
            if (handlerCopy != null){
                if (SynchronizingObject != null && SynchronizingObject.InvokeRequired) 
                    SynchronizingObject.BeginInvoke(handlerCopy, new object[] { this, appChangedArgs }); 
                else
                    handlerCopy(this, appChangedArgs); 
                Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Fired the application changed event callback.");
            }
        }
 
        //
        // Handles the callback when there is an application changed event from native collaboration 
        // 
        // 
        //  
        // 
        // 
        // 
        //  
        // 
        //  
        //  
        // 
        //  
        // 
        // 
        [System.Security.SecurityCritical]
        private void ApplicationChangedCallback(object state, bool timedOut) 
        {
            SafeCollabData eventData = null; 
            int errorCode = 0; 

            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "ApplicationChangedCallback() called."); 

            if (m_Disposed) return;

            while (true){ 
                ApplicationChangedEventArgs appChangedArgs = null;
 
                // 
                // Get the event data for the fired event
                // 
                try{
                    lock (LockAppChangedEvent)
                    {
                        if (m_safeAppChangedEvent.IsInvalid) return; 
                        errorCode = UnsafeCollabNativeMethods.PeerCollabGetEventData(m_safeAppChangedEvent,
                                                                                     out eventData); 
                    } 

                    if (errorCode == UnsafeCollabReturnCodes.PEER_S_NO_EVENT_DATA) 
                        break;
                    else if (errorCode != 0){
                        Logging.P2PTraceSource.TraceEvent(TraceEventType.Error, 0, "PeerCollabGetEventData returned with errorcode {0}", errorCode);
                        throw PeerToPeerException.CreateFromHr(SR.GetString(SR.Collab_GetApplicationChangedDataFailed), errorCode); 
                    }
 
                    PEER_COLLAB_EVENT_DATA ped = (PEER_COLLAB_EVENT_DATA)Marshal.PtrToStructure(eventData.DangerousGetHandle(), 
                                                                                                typeof(PEER_COLLAB_EVENT_DATA));
                    if (ped.eventType == PeerCollabEventType.EndPointApplicationChanged){ 
                        PEER_EVENT_APPLICATION_CHANGED_DATA appData = ped.applicationChangedData;
                        PEER_APPLICATION pa = (PEER_APPLICATION)Marshal.PtrToStructure(appData.pApplication, typeof(PEER_APPLICATION));

                        PeerApplication peerApplication = CollaborationHelperFunctions.ConvertPEER_APPLICATIONToPeerApplication(pa); ; 

                        // 
                        // Check if the Guid of the fired app is indeed our guid 
                        //
 
                        if (Guid.Equals(m_id, peerApplication.Id)){
                            PeerContact peerContact = null;
                            PeerEndPoint peerEndPoint = null;
 
                            if (appData.pContact != IntPtr.Zero){
                                PEER_CONTACT pc = (PEER_CONTACT)Marshal.PtrToStructure(appData.pContact, typeof(PEER_CONTACT)); 
                                peerContact = CollaborationHelperFunctions.ConvertPEER_CONTACTToPeerContact(pc); 
                            }
 
                            if (appData.pEndPoint != IntPtr.Zero){
                                PEER_ENDPOINT pe = (PEER_ENDPOINT)Marshal.PtrToStructure(appData.pEndPoint, typeof(PEER_ENDPOINT));
                                peerEndPoint = CollaborationHelperFunctions.ConvertPEER_ENDPOINTToPeerEndPoint(pe);
                            } 

                            appChangedArgs = new ApplicationChangedEventArgs(peerEndPoint, 
                                                                                                    peerContact, 
                                                                                                    appData.changeType,
                                                                                                    peerApplication); 
                        }
                    }
                }
                finally{ 
                    if (eventData != null) eventData.Dispose();
                } 
 
                //
                // Fire the callback with the marshalled event args data 
                //

                if(appChangedArgs != null)
                    OnApplicationChanged(appChangedArgs); 

            } 
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Leaving ApplicationChangedCallback()."); 
        }
 
        public bool Equals(PeerApplication other)
        {
            if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
 
            if (other != null){
                return Guid.Equals(other.Id, m_id); 
            } 
            return false;
        } 

        public override bool Equals(object obj)
        {
            if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName); 

            PeerApplication comparandPeerApplication = obj as PeerApplication; 
            if (comparandPeerApplication != null){ 
                return Guid.Equals(comparandPeerApplication.Id, Id);
            } 

            return false;
        }
 
        public new static bool Equals(object objA, object objB)
        { 
            PeerApplication comparandPeerApplication1 = objA as PeerApplication; 
            PeerApplication comparandPeerApplication2 = objB as PeerApplication;
 
            if ((comparandPeerApplication1 != null) && (comparandPeerApplication2 != null)){
                return Guid.Equals(comparandPeerApplication1.Id, comparandPeerApplication2.Id);
            }
 
            return false;
        } 
 
        public override int GetHashCode()
        { 
            if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);

            return Id.GetHashCode();
        } 

        public override string ToString() 
        { 
            if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
 
            return Id.ToString() + " " + Description;
        }

        private bool m_Disposed; 
        // 
        //  
        //  
        [System.Security.SecurityCritical]
        public void Dispose() 
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        } 

        //  
        //  
        // 
        //  
        [System.Security.SecurityCritical]
        protected virtual void Dispose(bool disposing)
        {
            if (!m_Disposed){ 
                CollaborationHelperFunctions.CleanEventVars(ref m_regAppChangedWaitHandle,
                                                            ref m_safeAppChangedEvent, 
                                                            ref m_appChangedEvent); 
                Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Clean ApplicationChanged variables successful.");
                m_Disposed = true; 
            }
        }

        //  
        // 
        //  
        [System.Security.SecurityCritical] 
        [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.SerializationFormatter, SerializationFormatter = true)]
        void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) 
        {
            GetObjectData(info, context);
        }
 
        /// 
        /// This is made virtual so that derived types can be implemented correctly 
        ///  

        [SecurityPermission(SecurityAction.LinkDemand, SerializationFormatter = true)] 
        protected virtual void GetObjectData(SerializationInfo info, StreamingContext context)
        {
            info.AddValue("_Id", m_id);
            info.AddValue("_Data", m_data); 
            info.AddValue("_Description", m_description);
            info.AddValue("_Path", m_path); 
            info.AddValue("_CommandLineArgs", m_commandLineArgs); 
            info.AddValue("_Scope", m_peerScope);
        } 

        //
        // Tracing information for Peer Application
        // 
        internal void TracePeerApplication()
        { 
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Contents of the PeerApplication"); 
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tGuid: {0}", Id);
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tDescription: {0}", Description); 
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tPath: {0}", Path);
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tCommandLineArgs: {0}", CommandLineArgs);
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tPeerScope: {0}", PeerScope);
 
            if (Data != null){
 
                if (Logging.P2PTraceSource.Switch.ShouldTrace(TraceEventType.Verbose)){ 
                    Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tApplication data:");
                    Logging.DumpData(Logging.P2PTraceSource, TraceEventType.Verbose, Logging.P2PTraceSource.MaxDataSize, Data, 0, Data.Length); 
                }
                else{
                    Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tApplication data length {0}", Data.Length);
                } 
            }
        } 
    } 

    // 
    // Manages collection of peer applications
    //
    [Serializable]
    public class PeerApplicationCollection : Collection 
    {
        internal PeerApplicationCollection() { } 
        protected override void SetItem(int index, PeerApplication item) 
        {
            // nulls not allowed 
            if (item == null){
                throw new ArgumentNullException("item");
            }
            base.SetItem(index, item); 
        }
 
        protected override void InsertItem(int index, PeerApplication item) 
        {
            // nulls not allowed 
            if (item == null){
                throw new ArgumentNullException("item");
            }
            base.InsertItem(index, item); 
        }
 
        public override string ToString() 
        {
            bool first = true; 
            StringBuilder builder = new StringBuilder();

            foreach (PeerApplication peerApplication in this){
                if(!first){ 
                    builder.Append(", ");
                } 
                else{ 
                    first = false;
                } 
                builder.Append(peerApplication.ToString());
            }
            return builder.ToString();
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net.PeerToPeer.Collaboration 
{ 
    using System;
    using System.Collections; 
    using System.Collections.Generic;
    using System.Collections.ObjectModel;
    using System.Threading;
    using System.Runtime.InteropServices; 
    using System.Text;
    using System.Diagnostics; 
    using System.ComponentModel; 
    using System.Runtime.Serialization;
    using System.Security.Permissions; 

    /// 
    /// This class handles all the functionality and events associated with the Collaboration
    /// Peer Application 
    /// 
    [Serializable] 
    public class PeerApplication : IDisposable, IEquatable, ISerializable 
    {
        private const int c_16K = 16384; 
        private Guid m_id;
        private byte[] m_data;
        private string m_description;
        private string m_path; 
        private string m_commandLineArgs;
        private PeerScope m_peerScope; 
        private ISynchronizeInvoke m_synchronizingObject; 

        // 
        // Initialize on first access of this class
        //

        //  
        // 
        //  
        [System.Security.SecurityCritical] 
        static PeerApplication()
        { 
            CollaborationHelperFunctions.Initialize();
        }

        public PeerApplication(){} 

        public PeerApplication( Guid id, string description, byte[] data, string path, 
                                string commandLineArgs, PeerScope peerScope) 
        {
            if ((data != null) && (data.Length > c_16K)) 
                throw new ArgumentException(SR.GetString(SR.Collab_ApplicationDataSizeFailed), "data");

            m_id = id;
            m_description = description; 
            m_data = data;
            m_path = path; 
            m_commandLineArgs = commandLineArgs; 
            m_peerScope = peerScope;
        } 

        /// 
        /// Constructor to enable serialization
        ///  
        protected PeerApplication(SerializationInfo serializationInfo, StreamingContext streamingContext)
        { 
            m_id = (Guid) serializationInfo.GetValue("_Id", typeof(Guid)); 
            m_data = (byte []) serializationInfo.GetValue("_Data", typeof(byte[]));
            m_description = serializationInfo.GetString("_Description"); 
            m_path = serializationInfo.GetString("_Path");
            m_commandLineArgs = serializationInfo.GetString("_CommandLineArgs");
            m_peerScope = (PeerScope) serializationInfo.GetInt32("_Scope");
        } 

        public Guid Id 
        { 
            get {
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName); 

                return m_id;
            }
            set { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
 
                m_id = value; 
            }
        } 

        public byte[] Data
        {
            get { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
 
                return m_data; 
            }
            set { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);

                if ((value != null) && (value.Length > c_16K))
                    throw new ArgumentException(SR.GetString(SR.Collab_ApplicationDataSizeFailed)); 

                m_data = value; 
            } 
        }
 
        public string Description
        {
            get{
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName); 
                return m_description;
            } 
            set { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
 
                m_description = value;
            }
        }
 
        public string Path
        { 
            get { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
                return m_path; 
            }
            set {
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
                m_path = value; 
            }
        } 
 
        public string CommandLineArgs
        { 
            get {
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
                return m_commandLineArgs;
            } 
            set {
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName); 
                m_commandLineArgs = value; 
            }
        } 

        public PeerScope PeerScope
        {
            get { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
                return m_peerScope; 
            } 
            set {
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName); 
                m_peerScope = value;
            }
        }
 
        /// 
        /// Gets and set the object used to marshall event handlers calls for stand alone 
        /// events 
        /// 
        [Browsable(false), DefaultValue(null), Description(SR.SynchronizingObject)] 
        public ISynchronizeInvoke SynchronizingObject
        {
            get
            { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
                return m_synchronizingObject; 
            } 
            set
            { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
                m_synchronizingObject = value;
            }
        } 

        private event EventHandler m_applicationChanged; 
        public event EventHandler ApplicationChanged 
        {
            //  
            // 
            // 
            [System.Security.SecurityCritical]
            add 
            {
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName); 
 
                PeerCollaborationPermission.UnrestrictedPeerCollaborationPermission.Demand();
                AddApplicationChanged(value); 
            }
            // 
            // 
            //  
            [System.Security.SecurityCritical]
            remove 
            { 
                if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
 
                PeerCollaborationPermission.UnrestrictedPeerCollaborationPermission.Demand();
                RemoveApplicationChanged(value);
            }
        } 

        #region Application changed event variables 
        private object m_lockAppChangedEvent; 
        private object LockAppChangedEvent
        { 
            get{
                if (m_lockAppChangedEvent == null){
                    object o = new object();
                    Interlocked.CompareExchange(ref m_lockAppChangedEvent, o, null); 
                }
                return m_lockAppChangedEvent; 
            } 
        }
 
        private RegisteredWaitHandle m_regAppChangedWaitHandle;
        private AutoResetEvent m_appChangedEvent;
        private SafeCollabEvent m_safeAppChangedEvent;
        #endregion 

        //  
        //  
        // 
        //  
        // 
        // 
        // 
        //  
        // 
        //  
        [System.Security.SecurityCritical] 
        private void AddApplicationChanged(EventHandler callback)
        { 
            //
            // Register a wait handle if one has not been registered already
            //
 
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "AddApplicationChanged() called.");
 
            lock (LockAppChangedEvent){ 
                if (m_applicationChanged == null){
                    if (m_id.Equals(Guid.Empty)){ 
                        throw new PeerToPeerException("No application guid defined"); }

                    m_appChangedEvent = new AutoResetEvent(false);
 
                    //
                    // Register callback with a wait handle 
                    // 

                    m_regAppChangedWaitHandle = ThreadPool.RegisterWaitForSingleObject(m_appChangedEvent, //Event that triggers the callback 
                                            new WaitOrTimerCallback(ApplicationChangedCallback), //callback to be called
                                            null, //state to be passed
                                            -1,   //Timeout - aplicable only for timers
                                            false //call us everytime the event is set 
                                            );
                    PEER_COLLAB_EVENT_REGISTRATION pcer = new PEER_COLLAB_EVENT_REGISTRATION(); 
                    pcer.eventType = PeerCollabEventType.EndPointApplicationChanged; 

                    GUID guid = CollaborationHelperFunctions.ConvertGuidToGUID(m_id); 
                    GCHandle guidHandle = GCHandle.Alloc(guid, GCHandleType.Pinned);

                    pcer.pInstance = guidHandle.AddrOfPinnedObject();
 
                    //
                    // Register event with collab 
                    // 

                    try{ 
                        Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Registering event with App ID {0}", m_id.ToString());

                        int errorCode = UnsafeCollabNativeMethods.PeerCollabRegisterEvent(
                                                                            m_appChangedEvent.SafeWaitHandle, 
                                                                            1,
                                                                            ref pcer, 
                                                                            out m_safeAppChangedEvent); 
                        if (errorCode != 0){
                            Logging.P2PTraceSource.TraceEvent(TraceEventType.Error, 0, "PeerCollabRegisterEvent returned with errorcode {0}", errorCode); 
                            throw PeerToPeerException.CreateFromHr(SR.GetString(SR.Collab_ApplicationChangedRegFailed), errorCode);
                        }
                    }
                    finally{ 
                        if (guidHandle.IsAllocated)
                            guidHandle.Free(); 
                    } 
                }
                m_applicationChanged += callback; 
            }

            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "AddApplicationChanged() successful.");
 
        }
 
        //  
        // 
        //  
        // 
        [System.Security.SecurityCritical]
        private void RemoveApplicationChanged(EventHandler callback)
        { 
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "RemoveApplicationChanged() called.");
 
            lock (LockAppChangedEvent){ 
                m_applicationChanged -= callback;
                if (m_applicationChanged == null){ 
                    CollaborationHelperFunctions.CleanEventVars(ref m_regAppChangedWaitHandle,
                                                                ref m_safeAppChangedEvent,
                                                                ref m_appChangedEvent);
                    Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Clean ApplicationChanged variables successful."); 
                }
            } 
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "RemoveApplicationChanged() successful."); 
        }
 
        protected virtual void OnApplicationChanged(ApplicationChangedEventArgs appChangedArgs)
        {
            EventHandler handlerCopy = m_applicationChanged;
 
            if (handlerCopy != null){
                if (SynchronizingObject != null && SynchronizingObject.InvokeRequired) 
                    SynchronizingObject.BeginInvoke(handlerCopy, new object[] { this, appChangedArgs }); 
                else
                    handlerCopy(this, appChangedArgs); 
                Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Fired the application changed event callback.");
            }
        }
 
        //
        // Handles the callback when there is an application changed event from native collaboration 
        // 
        // 
        //  
        // 
        // 
        // 
        //  
        // 
        //  
        //  
        // 
        //  
        // 
        // 
        [System.Security.SecurityCritical]
        private void ApplicationChangedCallback(object state, bool timedOut) 
        {
            SafeCollabData eventData = null; 
            int errorCode = 0; 

            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "ApplicationChangedCallback() called."); 

            if (m_Disposed) return;

            while (true){ 
                ApplicationChangedEventArgs appChangedArgs = null;
 
                // 
                // Get the event data for the fired event
                // 
                try{
                    lock (LockAppChangedEvent)
                    {
                        if (m_safeAppChangedEvent.IsInvalid) return; 
                        errorCode = UnsafeCollabNativeMethods.PeerCollabGetEventData(m_safeAppChangedEvent,
                                                                                     out eventData); 
                    } 

                    if (errorCode == UnsafeCollabReturnCodes.PEER_S_NO_EVENT_DATA) 
                        break;
                    else if (errorCode != 0){
                        Logging.P2PTraceSource.TraceEvent(TraceEventType.Error, 0, "PeerCollabGetEventData returned with errorcode {0}", errorCode);
                        throw PeerToPeerException.CreateFromHr(SR.GetString(SR.Collab_GetApplicationChangedDataFailed), errorCode); 
                    }
 
                    PEER_COLLAB_EVENT_DATA ped = (PEER_COLLAB_EVENT_DATA)Marshal.PtrToStructure(eventData.DangerousGetHandle(), 
                                                                                                typeof(PEER_COLLAB_EVENT_DATA));
                    if (ped.eventType == PeerCollabEventType.EndPointApplicationChanged){ 
                        PEER_EVENT_APPLICATION_CHANGED_DATA appData = ped.applicationChangedData;
                        PEER_APPLICATION pa = (PEER_APPLICATION)Marshal.PtrToStructure(appData.pApplication, typeof(PEER_APPLICATION));

                        PeerApplication peerApplication = CollaborationHelperFunctions.ConvertPEER_APPLICATIONToPeerApplication(pa); ; 

                        // 
                        // Check if the Guid of the fired app is indeed our guid 
                        //
 
                        if (Guid.Equals(m_id, peerApplication.Id)){
                            PeerContact peerContact = null;
                            PeerEndPoint peerEndPoint = null;
 
                            if (appData.pContact != IntPtr.Zero){
                                PEER_CONTACT pc = (PEER_CONTACT)Marshal.PtrToStructure(appData.pContact, typeof(PEER_CONTACT)); 
                                peerContact = CollaborationHelperFunctions.ConvertPEER_CONTACTToPeerContact(pc); 
                            }
 
                            if (appData.pEndPoint != IntPtr.Zero){
                                PEER_ENDPOINT pe = (PEER_ENDPOINT)Marshal.PtrToStructure(appData.pEndPoint, typeof(PEER_ENDPOINT));
                                peerEndPoint = CollaborationHelperFunctions.ConvertPEER_ENDPOINTToPeerEndPoint(pe);
                            } 

                            appChangedArgs = new ApplicationChangedEventArgs(peerEndPoint, 
                                                                                                    peerContact, 
                                                                                                    appData.changeType,
                                                                                                    peerApplication); 
                        }
                    }
                }
                finally{ 
                    if (eventData != null) eventData.Dispose();
                } 
 
                //
                // Fire the callback with the marshalled event args data 
                //

                if(appChangedArgs != null)
                    OnApplicationChanged(appChangedArgs); 

            } 
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Leaving ApplicationChangedCallback()."); 
        }
 
        public bool Equals(PeerApplication other)
        {
            if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
 
            if (other != null){
                return Guid.Equals(other.Id, m_id); 
            } 
            return false;
        } 

        public override bool Equals(object obj)
        {
            if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName); 

            PeerApplication comparandPeerApplication = obj as PeerApplication; 
            if (comparandPeerApplication != null){ 
                return Guid.Equals(comparandPeerApplication.Id, Id);
            } 

            return false;
        }
 
        public new static bool Equals(object objA, object objB)
        { 
            PeerApplication comparandPeerApplication1 = objA as PeerApplication; 
            PeerApplication comparandPeerApplication2 = objB as PeerApplication;
 
            if ((comparandPeerApplication1 != null) && (comparandPeerApplication2 != null)){
                return Guid.Equals(comparandPeerApplication1.Id, comparandPeerApplication2.Id);
            }
 
            return false;
        } 
 
        public override int GetHashCode()
        { 
            if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);

            return Id.GetHashCode();
        } 

        public override string ToString() 
        { 
            if (m_Disposed) throw new ObjectDisposedException(this.GetType().FullName);
 
            return Id.ToString() + " " + Description;
        }

        private bool m_Disposed; 
        // 
        //  
        //  
        [System.Security.SecurityCritical]
        public void Dispose() 
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        } 

        //  
        //  
        // 
        //  
        [System.Security.SecurityCritical]
        protected virtual void Dispose(bool disposing)
        {
            if (!m_Disposed){ 
                CollaborationHelperFunctions.CleanEventVars(ref m_regAppChangedWaitHandle,
                                                            ref m_safeAppChangedEvent, 
                                                            ref m_appChangedEvent); 
                Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Clean ApplicationChanged variables successful.");
                m_Disposed = true; 
            }
        }

        //  
        // 
        //  
        [System.Security.SecurityCritical] 
        [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.SerializationFormatter, SerializationFormatter = true)]
        void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) 
        {
            GetObjectData(info, context);
        }
 
        /// 
        /// This is made virtual so that derived types can be implemented correctly 
        ///  

        [SecurityPermission(SecurityAction.LinkDemand, SerializationFormatter = true)] 
        protected virtual void GetObjectData(SerializationInfo info, StreamingContext context)
        {
            info.AddValue("_Id", m_id);
            info.AddValue("_Data", m_data); 
            info.AddValue("_Description", m_description);
            info.AddValue("_Path", m_path); 
            info.AddValue("_CommandLineArgs", m_commandLineArgs); 
            info.AddValue("_Scope", m_peerScope);
        } 

        //
        // Tracing information for Peer Application
        // 
        internal void TracePeerApplication()
        { 
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Contents of the PeerApplication"); 
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tGuid: {0}", Id);
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tDescription: {0}", Description); 
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tPath: {0}", Path);
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tCommandLineArgs: {0}", CommandLineArgs);
            Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tPeerScope: {0}", PeerScope);
 
            if (Data != null){
 
                if (Logging.P2PTraceSource.Switch.ShouldTrace(TraceEventType.Verbose)){ 
                    Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tApplication data:");
                    Logging.DumpData(Logging.P2PTraceSource, TraceEventType.Verbose, Logging.P2PTraceSource.MaxDataSize, Data, 0, Data.Length); 
                }
                else{
                    Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "\tApplication data length {0}", Data.Length);
                } 
            }
        } 
    } 

    // 
    // Manages collection of peer applications
    //
    [Serializable]
    public class PeerApplicationCollection : Collection 
    {
        internal PeerApplicationCollection() { } 
        protected override void SetItem(int index, PeerApplication item) 
        {
            // nulls not allowed 
            if (item == null){
                throw new ArgumentNullException("item");
            }
            base.SetItem(index, item); 
        }
 
        protected override void InsertItem(int index, PeerApplication item) 
        {
            // nulls not allowed 
            if (item == null){
                throw new ArgumentNullException("item");
            }
            base.InsertItem(index, item); 
        }
 
        public override string ToString() 
        {
            bool first = true; 
            StringBuilder builder = new StringBuilder();

            foreach (PeerApplication peerApplication in this){
                if(!first){ 
                    builder.Append(", ");
                } 
                else{ 
                    first = false;
                } 
                builder.Append(peerApplication.ToString());
            }
            return builder.ToString();
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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