Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / AddIn / AddIn / System / Addin / Pipeline / ContractBase.cs / 1305376 / ContractBase.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: ContractBase ** ** Purpose: Provides default implementations of IContract members ** ===========================================================*/ using System; using System.Collections.Generic; using System.Diagnostics; using System.Globalization; using System.IO; using System.Reflection; using System.AddIn.Contract; using System.AddIn; using System.Runtime.Remoting.Lifetime; using System.Security.Permissions; using System.Security; using System.Diagnostics.Contracts; namespace System.AddIn.Pipeline { ////// Provides default implementations of IContract members /// public class ContractBase : MarshalByRefObject, IContract, ISponsor { private Listm_lifetimeTokens = new List (); private List m_contractIdentifiers; private readonly Object m_contractIdentifiersLock = new Object(); private Random m_random; // flag to indicate that the references that were taken have all been removed; private bool m_zeroReferencesLeft = false; private int m_tokenOfAppdomainOwner; public virtual bool RemoteEquals(IContract contract) { return this.Equals(contract); } public virtual String RemoteToString() { return this.ToString(); } public virtual int GetRemoteHashCode() { return this.GetHashCode(); } // // return 'this' if we implement the contract, null otherwise // public virtual IContract QueryContract(String contractIdentifier) { if (contractIdentifier == null) throw new ArgumentNullException("contractIdentifier"); System.Diagnostics.Contracts.Contract.EndContractBlock(); if (m_contractIdentifiers == null) { lock (m_contractIdentifiersLock) { if (m_contractIdentifiers == null) { Type t = this.GetType(); Type[] interfaces = t.GetInterfaces(); List identifiers = new List (interfaces.Length); Type typeOfIContract = typeof(IContract); foreach (Type iface in interfaces) { if (typeOfIContract.IsAssignableFrom(iface)) { identifiers.Add(iface.AssemblyQualifiedName); } } identifiers.Sort(); System.Threading.Thread.MemoryBarrier(); m_contractIdentifiers = identifiers; } } } int i = m_contractIdentifiers.BinarySearch(contractIdentifier); return i >= 0 ? this : null; } public int AcquireLifetimeToken() { if (m_zeroReferencesLeft) { throw new InvalidOperationException(Res.TokenCountZero); } int next; lock (m_lifetimeTokens) { // Lazily initialize m_random for perf. if (m_random == null) { m_random = new Random(); } next = m_random.Next(); while (m_lifetimeTokens.Contains(next)) { next = m_random.Next(); } m_lifetimeTokens.Add(next); if (m_lifetimeTokens.Count == 1) { // Register as a sponsor the first time a token is aquired. // need to do this here instead of in InitializeLifetimeService because of a bug in remoting // involving security. RegisterAsSponsor(); // Increment ref count on appdomain owner if needed IContract owner = ContractHandle.AppDomainOwner(AppDomain.CurrentDomain); if (owner != null && owner != this) { m_tokenOfAppdomainOwner = owner.AcquireLifetimeToken(); } } } return next; } // // [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2129:SecurityTransparentCodeShouldNotReferenceNonpublicSecurityCriticalCode", Justification = "This is a SecurityRules.Level1 assembly, in which this rule is being incorrectly applied")] [System.Security.SecuritySafeCritical] [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2128:SecurityTransparentCodeShouldNotAssert", Justification = "This is a SecurityRules.Level1 assembly, in which this rule is being incorrectly applied")] public void RevokeLifetimeToken(int token) { lock (m_lifetimeTokens) { if (!m_lifetimeTokens.Remove(token)) throw new InvalidOperationException(Res.LifetimeTokenNotFound); if (m_lifetimeTokens.Count == 0) { m_zeroReferencesLeft = true; // hook to allow subclasses to clean up OnFinalRevoke(); IContract owner = ContractHandle.AppDomainOwner(AppDomain.CurrentDomain); if (owner != null) { if (owner == this) { // Create a separate thread to unload this appdomain, because we // cannot shut down an appdomain from the Finalizer thread (though there // is a bug that allows us to do so after the first appdomain has been // unloaded, but let's not rely on that). // We can consider using an threadpool thread to do this, but that would add // test burden. SecurityPermission permission = new SecurityPermission(SecurityPermissionFlag.ControlThread); permission.Assert(); System.Threading.ThreadStart threadDelegate = new System.Threading.ThreadStart(AppDomainUnload); System.Threading.Thread unloaderThread = new System.Threading.Thread(threadDelegate); unloaderThread.Start(); } else owner.RevokeLifetimeToken(m_tokenOfAppdomainOwner); } } } } // To be overridden if needed. // This is similar to the Dispose pattern, but it is not public. protected virtual void OnFinalRevoke() { } //// // // [System.Security.SecurityCritical] private void AppDomainUnload() { // assert is needed for the Internet named permission set. SecurityPermission permission = new SecurityPermission(SecurityPermissionFlag.ControlAppDomain); permission.Assert(); // The AppDomainUnloadedException thrown here will be eaten by the runtime. AppDomain.Unload(AppDomain.CurrentDomain); } //// // [System.Security.SecurityCritical] [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase", Justification="SecurityRules.Level1 assemblies cannot contain Critical code, so they need LinkDemands to protect overridden Critical members from SecurityRules.Level2 assemblies")] public TimeSpan Renewal(ILease lease) { if (lease == null) throw new ArgumentNullException("lease"); System.Diagnostics.Contracts.Contract.EndContractBlock(); lock (m_lifetimeTokens) { return m_lifetimeTokens.Count > 0 ? lease.InitialLeaseTime : TimeSpan.Zero; } } //// // [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands", Justification="Reviewed")] [System.Security.SecuritySafeCritical] [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2128:SecurityTransparentCodeShouldNotAssert", Justification = "This is a SecurityRules.Level1 assembly, in which this rule is being incorrectly applied")] private void RegisterAsSponsor() { ILease baseLease = (ILease)GetLifetimeService(); if (baseLease != null) { // Assert permission to register as a sponsor for this lease. This is needed for the Internet permission level. SecurityPermission permission = new SecurityPermission(SecurityPermissionFlag.RemotingConfiguration); permission.Assert(); try { // register for sponsorship baseLease.Register(this); } finally { CodeAccessPermission.RevertAssert(); } } // baseLease == null when we are not in a separate appdomain } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.// // //
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