Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / SystemNet / Net / PeerToPeer / Cloud.cs / 1305376 / Cloud.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net.PeerToPeer { using System; using System.Collections.Generic; using System.Text; using System.Runtime.Serialization; using System.Security.Permissions; using System.Diagnostics; using System.Diagnostics.CodeAnalysis; using System.Runtime.InteropServices; ////// The Cloud class directly represents the native cloud concept in the P2P APIs /// There are two special static readonly members we support /// Cloud.All and Cloud.AllLinkLocal /// Cloud.All is really a notational convinience of null in the native world /// Cloud.AllLinkLocal is equivalent to PEER_PNRP_ALL_LINK_CLOUDS const in the header file (declared in p2p.h) /// /// This class is serializable. /// This class is not sealed because there is no reason for it to be sealed. /// /// < [Serializable] public class Cloud : ISerializable, IEquatable{ private const string PEER_PNRP_ALL_LINK_CLOUDS = "PEER_PNRP_ALL_LINKS"; private string m_CloudName; //name of the cloud private PnrpScope m_PnrpScope; //scope of the cloud private int m_ScopeId; //scope Id of the scope /// /// Cloud.AllAvailable is a notational convinience. The native side uses a null for cloud parameter /// to indicate all clouds. /// public static readonly Cloud Available = new Cloud("AllAvailable", PnrpScope.All, -1); ////// AllLinkLocal is a managed abstraction of the native const PEER_PNRP_ALL_LINK_CLOUDS /// public static readonly Cloud AllLinkLocal = new Cloud("AllLinkLocal", PnrpScope.LinkLocal, -1); ////// The static constructor serves the purpose of checking the /// availability of the P2P apis on this platform /// static Cloud() { //------------------------------------------------- //Check for the availability of the simpler PNRP APIs //------------------------------------------------- if (!PeerToPeerOSHelper.SupportsP2P) { throw new PlatformNotSupportedException(SR.GetString(SR.P2P_NotAvailable)); } } ////// Constructs an instance of a Cloud. /// This is not public and accessible for internal members only /// /// Name of the cloud /// scope /// id ofthe scope internal Cloud(string name, PnrpScope pnrpScope, int scopeId) { Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Creating cloud with Name: {0}, PnrpScope: {1}, ScopeID: {2}", name, pnrpScope, scopeId); m_CloudName = name; m_PnrpScope = pnrpScope; m_ScopeId = scopeId; } ////// Name /// public string Name { get { if (this == Cloud.AllLinkLocal || this == Cloud.Available) return null; return m_CloudName; } } internal string InternalName { get { if (this == Cloud.AllLinkLocal) return PEER_PNRP_ALL_LINK_CLOUDS; else if (this == Cloud.Available) return null; return m_CloudName; } } ////// Scope /// public PnrpScope Scope { get { return m_PnrpScope; } } ////// ScopeId /// public int ScopeId { get { return m_ScopeId; } } public static Cloud Global { //// //[System.Security.SecurityCritical] get { //throw new PeerToPeerException(SR.GetString(SR.Collab_SubscribeLocalContactFailed)); CloudCollection dummy = null; Cloud cloud = null; GetCloudOrClouds(null, true, out dummy, out cloud); return cloud; } } //// // //[System.Security.SecurityCritical] public static Cloud GetCloudByName(string cloudName) { if (cloudName == null || cloudName.Length == 0) { throw new ArgumentException(SR.GetString(SR.Pnrp_CloudNameCantBeNull), "cloudName"); } CloudCollection dummy = null; Cloud cloud = null; GetCloudOrClouds(cloudName, false, out dummy, out cloud); return cloud; } ///// /// The static member returns the list of clouds /// ///// // //[System.Security.SecurityCritical] public static CloudCollection GetAvailableClouds() { CloudCollection clouds = null; Cloud dummy = null; GetCloudOrClouds(null, false, out clouds, out dummy); return clouds; } //// // [SuppressMessage("Microsoft.Security","CA2129:SecurityTransparentCodeShouldNotReferenceNonpublicSecurityCriticalCode", Justification="System.Net.dll is still using pre-v4 security model and needs this demand")] [System.Security.SecuritySafeCritical] private static void GetCloudOrClouds(string cloudName, bool bGlobalCloudOnly, out CloudCollection clouds, out Cloud cloud) { cloud = null; clouds = null; Logging.Enter(Logging.P2PTraceSource, "Cloud::GetCloudOrClouds()"); //------------------------------------------------- //Demand for the Unrestricted Pnrp Permission //------------------------------------------------- PnrpPermission.UnrestrictedPnrpPermission.Demand(); Int32 result = 0; UInt32 numClouds = 0; SafePeerData ArrayOfCloudInfoStructures = null; if (cloudName == null) { //----------------------------------------- //We need the collection only when we are not //getting a specific cloud //----------------------------------------- clouds = new CloudCollection(); } try { //--------------------------------------------------------------- //No perf hit here, real native call happens only one time if it //did not already happen //--------------------------------------------------------------- UnsafeP2PNativeMethods.PnrpStartup(); result = UnsafeP2PNativeMethods.PeerPnrpGetCloudInfo(out numClouds, out ArrayOfCloudInfoStructures); if (result != 0) { throw PeerToPeerException.CreateFromHr(SR.GetString(SR.Pnrp_CouldNotEnumerateClouds), result); } if (numClouds != 0) { Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "Number of clouds returned {0}", numClouds); IntPtr pPEER_PNRP_CLOUD_INFO = ArrayOfCloudInfoStructures.DangerousGetHandle(); for (ulong i = 0; i < numClouds; i++) { PEER_PNRP_CLOUD_INFO cloudinfo = (PEER_PNRP_CLOUD_INFO)Marshal.PtrToStructure(pPEER_PNRP_CLOUD_INFO, typeof(PEER_PNRP_CLOUD_INFO)); string nativeCloudName = Marshal.PtrToStringUni(cloudinfo.pwzCloudName); pPEER_PNRP_CLOUD_INFO = (IntPtr)((long)pPEER_PNRP_CLOUD_INFO + Marshal.SizeOf(typeof(PEER_PNRP_CLOUD_INFO))); Cloud c = new Cloud(nativeCloudName, (PnrpScope)((int)cloudinfo.dwScope), (int)cloudinfo.dwScopeId); if (cloudName == null && !bGlobalCloudOnly) { clouds.Add(c); continue; } //If a specific cloud by name is required, then test for name //note that scope is PnrpScope.All but we don't test that now if (cloudName != null && cloudName == nativeCloudName) { cloud = c; break; } if (bGlobalCloudOnly && c.Scope == PnrpScope.Global) { cloud = c; break; } } } else { Logging.P2PTraceSource.TraceEvent(TraceEventType.Warning, 0, "No Clouds returned from the native call"); } } finally { if (ArrayOfCloudInfoStructures != null) { ArrayOfCloudInfoStructures.Dispose(); } } if (cloudName != null && cloud == null) { Logging.P2PTraceSource.TraceEvent(TraceEventType.Information, 0, "The specific cloud name {0} asked for is not found", cloudName); } Logging.Leave(Logging.P2PTraceSource, "Cloud::GetCloudOrClouds()"); } ///// // // // // // // // // /// Two Clouds are equal only when all of the information matches /// /// ///public bool Equals(Cloud other) { if (other == null) return false; return other.Name == Name && other.Scope == Scope && other.ScopeId == ScopeId; } public override bool Equals(object obj) { if (obj == null) return false; Cloud other = obj as Cloud; if (other == null) return false; return Equals(other); } /// /// The hash code comes from just the cloud name - for no partular reason. /// This implementation seems sufficient - since the cloud names or typically /// unique /// ///public override int GetHashCode() { return m_CloudName.GetHashCode(); } /// /// A friendly string for the Cloud object /// ///public override string ToString() { StringBuilder sb = new StringBuilder(); sb.Append("Cloud Name:"); sb.Append(Name); sb.Append(" Scope:"); sb.Append(Scope); sb.Append(" ScopeId:"); sb.Append(ScopeId); return sb.ToString(); } /// /// Constructor to enable serialization /// /// /// protected Cloud(SerializationInfo info, StreamingContext context) { m_CloudName = info.GetString("_CloudName"); m_PnrpScope = (PnrpScope)info.GetValue("_CloudScope", typeof(PnrpScope)); m_ScopeId = info.GetInt32("_CloudScopeId"); } //// [SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase", Justification = "System.Net.dll is still using pre-v4 security model and needs this demand")] [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) { //Name is tricky since it can be null for AllLinkLocal and Available clouds //but internally we represent them with non null strings //so we should use the property here info.AddValue("_CloudName", Name); info.AddValue("_CloudScope", m_PnrpScope); info.AddValue("_CloudScopeId", m_ScopeId); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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