510 lines
14 KiB
C#
510 lines
14 KiB
C#
//
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// System.Runtime.Remoting.Contexts.Context..cs
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//
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// Author:
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// Miguel de Icaza (miguel@ximian.com)
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// Lluis Sanchez Gual (lluis@ideary.com)
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// Patrik Torstensson
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//
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// (C) Ximian, Inc. http://www.ximian.com
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//
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//
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// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Collections;
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using System.Collections.Generic;
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using System.Threading;
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using System.Runtime.Remoting;
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using System.Runtime.Remoting.Proxies;
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using System.Runtime.Remoting.Activation;
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using System.Runtime.Remoting.Messaging;
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using System.Runtime.Remoting.Lifetime;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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namespace System.Runtime.Remoting.Contexts {
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[System.Runtime.InteropServices.ComVisible (true)]
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[StructLayout (LayoutKind.Sequential)]
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public class Context
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{
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#pragma warning disable 169, 414
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#region Sync with domain-internals.h
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int domain_id;
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int context_id;
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UIntPtr static_data; /* GC-tracked */
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UIntPtr data;
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#endregion
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#pragma warning restore 169, 414
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// Name is significant; used by the runtime.
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[ContextStatic]
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static object[] local_slots;
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// Default server context sink chain
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static IMessageSink default_server_context_sink;
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// The sink chain that has to be used by all calls entering the context
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IMessageSink server_context_sink_chain = null;
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// The sink chain that has to be used by all calls exiting the context
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IMessageSink client_context_sink_chain = null;
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List<IContextProperty> context_properties;
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// bool frozen;
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static int global_count;
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volatile LocalDataStoreHolder _localDataStore;
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static LocalDataStoreMgr _localDataStoreMgr = new LocalDataStoreMgr();
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static DynamicPropertyCollection global_dynamic_properties;
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DynamicPropertyCollection context_dynamic_properties;
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ContextCallbackObject callback_object = null;
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[MethodImpl (MethodImplOptions.InternalCall)]
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extern static void RegisterContext (Context ctx);
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[MethodImpl (MethodImplOptions.InternalCall)]
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extern static void ReleaseContext (Context ctx);
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public Context ()
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{
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domain_id = Thread.GetDomainID();
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context_id = Interlocked.Increment (ref global_count);
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RegisterContext (this);
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}
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~Context ()
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{
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ReleaseContext (this);
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}
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public static Context DefaultContext {
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get {
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return AppDomain.InternalGetDefaultContext ();
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}
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}
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public virtual int ContextID {
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get {
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return context_id;
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}
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}
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public virtual IContextProperty[] ContextProperties
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{
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get
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{
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if (context_properties == null)
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return new IContextProperty[0];
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return context_properties.ToArray ();
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}
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}
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internal bool IsDefaultContext
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{
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get { return context_id == 0; }
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}
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internal bool NeedsContextSink
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{
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get {
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return context_id != 0 ||
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(global_dynamic_properties != null && global_dynamic_properties.HasProperties) ||
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(context_dynamic_properties != null && context_dynamic_properties.HasProperties);
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}
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}
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public static bool RegisterDynamicProperty(IDynamicProperty prop, ContextBoundObject obj, Context ctx)
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{
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DynamicPropertyCollection col = GetDynamicPropertyCollection (obj, ctx);
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return col.RegisterDynamicProperty (prop);
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}
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public static bool UnregisterDynamicProperty(string name, ContextBoundObject obj, Context ctx)
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{
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DynamicPropertyCollection col = GetDynamicPropertyCollection (obj, ctx);
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return col.UnregisterDynamicProperty (name);
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}
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static DynamicPropertyCollection GetDynamicPropertyCollection(ContextBoundObject obj, Context ctx)
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{
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if (ctx == null && obj != null)
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{
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if (RemotingServices.IsTransparentProxy(obj))
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{
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RealProxy rp = RemotingServices.GetRealProxy (obj);
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return rp.ObjectIdentity.ClientDynamicProperties;
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}
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else
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{
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#if FEATURE_REMOTING
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return obj.ObjectIdentity.ServerDynamicProperties;
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#else
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throw new NotSupportedException ();
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#endif
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}
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}
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else if (ctx != null && obj == null)
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{
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if (ctx.context_dynamic_properties == null) ctx.context_dynamic_properties = new DynamicPropertyCollection ();
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return ctx.context_dynamic_properties;
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}
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else if (ctx == null && obj == null)
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{
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if (global_dynamic_properties == null) global_dynamic_properties = new DynamicPropertyCollection ();
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return global_dynamic_properties;
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}
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else
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throw new ArgumentException ("Either obj or ctx must be null");
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}
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internal static void NotifyGlobalDynamicSinks (bool start, IMessage req_msg, bool client_site, bool async)
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{
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if (global_dynamic_properties != null && global_dynamic_properties.HasProperties)
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global_dynamic_properties.NotifyMessage (start, req_msg, client_site, async);
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}
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internal static bool HasGlobalDynamicSinks
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{
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get { return (global_dynamic_properties != null && global_dynamic_properties.HasProperties); }
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}
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internal void NotifyDynamicSinks (bool start, IMessage req_msg, bool client_site, bool async)
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{
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if (context_dynamic_properties != null && context_dynamic_properties.HasProperties)
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context_dynamic_properties.NotifyMessage (start, req_msg, client_site, async);
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}
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internal bool HasDynamicSinks
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{
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get { return (context_dynamic_properties != null && context_dynamic_properties.HasProperties); }
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}
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internal bool HasExitSinks
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{
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get
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{
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// Needs to go through the client context sink if there are custom
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// client context or dynamic sinks.
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return ( !(GetClientContextSinkChain() is ClientContextTerminatorSink) || HasDynamicSinks || HasGlobalDynamicSinks);
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}
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}
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public virtual IContextProperty GetProperty (string name)
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{
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if (context_properties == null)
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return null;
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foreach (IContextProperty p in context_properties)
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if (p.Name == name)
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return p;
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return null;
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}
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public virtual void SetProperty (IContextProperty prop)
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{
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if (prop == null)
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throw new ArgumentNullException ("IContextProperty");
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if (this == DefaultContext)
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throw new InvalidOperationException ("Can not add properties to " +
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"default context");
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// if (frozen)
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// throw new InvalidOperationException ("Context is Frozen");
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if (context_properties == null)
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context_properties = new List<IContextProperty> ();
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context_properties.Add (prop);
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}
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public virtual void Freeze ()
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{
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if (context_properties != null)
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{
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foreach (IContextProperty prop in context_properties)
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prop.Freeze (this);
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}
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}
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public override string ToString()
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{
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return "ContextID: " + context_id;
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}
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internal IMessageSink GetServerContextSinkChain()
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{
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if (server_context_sink_chain == null)
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{
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if (default_server_context_sink == null)
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default_server_context_sink = new ServerContextTerminatorSink();
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server_context_sink_chain = default_server_context_sink;
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if (context_properties != null) {
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// Enumerate in reverse order
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for (int n = context_properties.Count-1; n>=0; n--) {
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IContributeServerContextSink contributor = context_properties[n] as IContributeServerContextSink;
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if (contributor != null)
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server_context_sink_chain = contributor.GetServerContextSink (server_context_sink_chain);
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}
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}
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}
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return server_context_sink_chain;
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}
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internal IMessageSink GetClientContextSinkChain()
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{
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if (client_context_sink_chain == null)
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{
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client_context_sink_chain = new ClientContextTerminatorSink (this);
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if (context_properties != null) {
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foreach (IContextProperty prop in context_properties) {
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IContributeClientContextSink contributor = prop as IContributeClientContextSink;
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if (contributor != null)
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client_context_sink_chain = contributor.GetClientContextSink (client_context_sink_chain);
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}
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}
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}
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return client_context_sink_chain;
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}
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internal IMessageSink CreateServerObjectSinkChain (MarshalByRefObject obj, bool forceInternalExecute)
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{
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IMessageSink objectSink = new StackBuilderSink (obj, forceInternalExecute);
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objectSink = new ServerObjectTerminatorSink (objectSink);
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objectSink = new Lifetime.LeaseSink (objectSink);
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if (context_properties != null)
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{
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// Contribute object sinks in reverse order
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for (int n = context_properties.Count-1; n >= 0; n--)
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{
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IContextProperty prop = (IContextProperty) context_properties[n];
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IContributeObjectSink contributor = prop as IContributeObjectSink;
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if (contributor != null)
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objectSink = contributor.GetObjectSink (obj, objectSink);
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}
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}
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return objectSink;
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}
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internal IMessageSink CreateEnvoySink (MarshalByRefObject serverObject)
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{
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IMessageSink sink = EnvoyTerminatorSink.Instance;
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if (context_properties != null)
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{
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foreach (IContextProperty prop in context_properties)
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{
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IContributeEnvoySink contributor = prop as IContributeEnvoySink;
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if (contributor != null)
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sink = contributor.GetEnvoySink (serverObject, sink);
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}
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}
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return sink;
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}
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internal static Context SwitchToContext (Context newContext)
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{
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return AppDomain.InternalSetContext (newContext);
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}
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internal static Context CreateNewContext (IConstructionCallMessage msg)
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{
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// Create the new context
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Context newContext = new Context();
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foreach (IContextProperty prop in msg.ContextProperties)
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{
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if (newContext.GetProperty (prop.Name) == null)
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newContext.SetProperty (prop);
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}
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newContext.Freeze();
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// Ask each context property whether the new context is OK
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foreach (IContextProperty prop in msg.ContextProperties)
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if (!prop.IsNewContextOK (newContext))
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throw new RemotingException("A context property did not approve the candidate context for activating the object");
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return newContext;
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}
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public void DoCallBack (CrossContextDelegate deleg)
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{
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lock (this)
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{
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if (callback_object == null) {
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Context oldContext = Context.SwitchToContext (this);
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callback_object = new ContextCallbackObject ();
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Context.SwitchToContext (oldContext);
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}
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}
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callback_object.DoCallBack (deleg);
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}
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private LocalDataStore MyLocalStore
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{
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get
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{
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if (_localDataStore == null)
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{
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// It's OK to lock the manager here because it is going to lock
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// itself anyway.
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lock (_localDataStoreMgr)
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{
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if (_localDataStore == null)
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{
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// The local store has not yet been created for this thread.
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_localDataStore = _localDataStoreMgr.CreateLocalDataStore();
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}
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}
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}
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return _localDataStore.Store;
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}
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}
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public static LocalDataStoreSlot AllocateDataSlot ()
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{
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return _localDataStoreMgr.AllocateDataSlot ();
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}
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public static LocalDataStoreSlot AllocateNamedDataSlot (string name)
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{
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return _localDataStoreMgr.AllocateNamedDataSlot (name);
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}
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public static void FreeNamedDataSlot (string name)
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{
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_localDataStoreMgr.FreeNamedDataSlot (name);
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}
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public static LocalDataStoreSlot GetNamedDataSlot (string name)
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{
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return _localDataStoreMgr.GetNamedDataSlot (name);
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}
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public static object GetData (LocalDataStoreSlot slot)
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{
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return Thread.CurrentContext.MyLocalStore.GetData (slot);
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}
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public static void SetData (LocalDataStoreSlot slot, object data)
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{
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Thread.CurrentContext.MyLocalStore.SetData (slot, data);
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}
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}
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class DynamicPropertyCollection
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{
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ArrayList _properties = new ArrayList();
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class DynamicPropertyReg
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{
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public IDynamicProperty Property;
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public IDynamicMessageSink Sink;
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}
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public bool HasProperties
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{
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get { return _properties.Count > 0; }
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}
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public bool RegisterDynamicProperty(IDynamicProperty prop)
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{
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lock (this)
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{
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if (FindProperty (prop.Name) != -1)
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throw new InvalidOperationException ("Another property by this name already exists");
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// Make a copy, do not interfere with threads running dynamic sinks
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ArrayList newProps = new ArrayList (_properties);
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DynamicPropertyReg reg = new DynamicPropertyReg();
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reg.Property = prop;
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IContributeDynamicSink contributor = prop as IContributeDynamicSink;
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if (contributor != null) reg.Sink = contributor.GetDynamicSink ();
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newProps.Add (reg);
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_properties = newProps;
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return true; // When should be false?
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}
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}
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public bool UnregisterDynamicProperty(string name)
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{
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lock (this)
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{
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int i = FindProperty (name);
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if (i == -1) throw new RemotingException ("A property with the name " + name + " was not found");
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_properties.RemoveAt (i);
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return true; // When should be false?
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}
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}
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public void NotifyMessage (bool start, IMessage msg, bool client_site, bool async)
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{
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ArrayList props = _properties;
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if (start)
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{
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foreach (DynamicPropertyReg reg in props)
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if (reg.Sink != null) reg.Sink.ProcessMessageStart (msg, client_site, async);
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}
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else
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{
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foreach (DynamicPropertyReg reg in props)
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if (reg.Sink != null) reg.Sink.ProcessMessageFinish (msg, client_site, async);
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}
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}
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int FindProperty (string name)
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{
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for (int n=0; n<_properties.Count; n++)
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if (((DynamicPropertyReg)_properties[n]).Property.Name == name)
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return n;
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return -1;
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}
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}
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class ContextCallbackObject: ContextBoundObject
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{
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public void DoCallBack (CrossContextDelegate deleg)
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{
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}
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}
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}
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