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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Diagnostics.Contracts;
using System.ServiceModel.Channels;
namespace System.ServiceModel.Dispatcher
{
internal class PerSessionInstanceContextProvider : InstanceContextProviderBase
{
internal PerSessionInstanceContextProvider(DispatchRuntime dispatchRuntime)
: base(dispatchRuntime)
{
}
public override InstanceContext GetExistingInstanceContext(Message message, IContextChannel channel)
{
// Here is the flow for a Sessionful channel
// 1. First request comes in on new channel.
// 2. ServiceChannel.InstanceContext is returned which is null.
// 3. InstanceBehavior.EnsureInstanceContext will create a new InstanceContext.
// 4. this.InitializeInstanceContext is called with the newly created InstanceContext and the channel.
// 5. If the channel is sessionful then its bound to the InstanceContext.
// 6. Bind channel to the InstanceContext.
// 7. For all further requests on the same channel, we will return ServiceChannel.InstanceContext which will be non null.
ServiceChannel serviceChannel = GetServiceChannelFromProxy(channel);
Contract.Assert((serviceChannel != null), "System.ServiceModel.Dispatcher.PerSessionInstanceContextProvider.GetExistingInstanceContext(), serviceChannel != null");
return (serviceChannel != null) ? serviceChannel.InstanceContext : null;
}
}
} |