ReliableInputConnection.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / Channels / ReliableInputConnection.cs / 1 / ReliableInputConnection.cs

                            //---------------------------------------------------------------------------- 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//---------------------------------------------------------------------------
namespace System.ServiceModel.Channels
{ 
    sealed class ReliableInputConnection
    { 
        bool isLastKnown = false; 
        bool isSequenceClosed = false;
        Int64 last = 0; 
        SequenceRangeCollection ranges = SequenceRangeCollection.Empty;
        ReliableMessagingVersion reliableMessagingVersion;
        InterruptibleWaitObject shutdownWaitObject = new InterruptibleWaitObject(false);
        bool terminated = false; 
        InterruptibleWaitObject terminateWaitObject = new InterruptibleWaitObject(false, false);
 
        public ReliableInputConnection() 
        {
        } 

        public bool AllAdded
        {
            get 
            {
                return (this.ranges.Count == 1 
                    && this.ranges[0].Lower == 1 
                    && this.ranges[0].Upper == this.last)
                    || this.isLastKnown; 
            }
        }

        public bool IsLastKnown 
        {
            get 
            { 
                return this.last != 0 || this.isLastKnown;
            } 
        }

        public bool IsSequenceClosed
        { 
            get
            { 
                return this.isSequenceClosed; 
            }
        } 

        public Int64 Last
        {
            get 
            {
                return this.last; 
            } 
        }
 
        public SequenceRangeCollection Ranges
        {
            get
            { 
                return this.ranges;
            } 
        } 

        public ReliableMessagingVersion ReliableMessagingVersion 
        {
            set
            {
                this.reliableMessagingVersion = value; 
            }
        } 
 
        public void Abort(ChannelBase channel)
        { 
            this.shutdownWaitObject.Abort(channel);
            this.terminateWaitObject.Abort(channel);
        }
 
        public bool CanMerge(Int64 sequenceNumber)
        { 
            return ReliableInputConnection.CanMerge(sequenceNumber, this.ranges); 
        }
 
        // Returns true if merging the number will not increase the number of ranges past MaxSequenceRanges.
        public static bool CanMerge(Int64 sequenceNumber, SequenceRangeCollection ranges)
        {
            if (ranges.Count < ReliableMessagingConstants.MaxSequenceRanges) 
            {
                return true; 
            } 

            ranges = ranges.MergeWith(sequenceNumber); 
            return ranges.Count <= ReliableMessagingConstants.MaxSequenceRanges;
        }

        public void Fault(ChannelBase channel) 
        {
            this.shutdownWaitObject.Fault(channel); 
            this.terminateWaitObject.Fault(channel); 
        }
 
        public bool IsValid(Int64 sequenceNumber, bool isLast)
        {
            if (this.reliableMessagingVersion == ReliableMessagingVersion.WSReliableMessagingFebruary2005)
            { 
                if (isLast)
                { 
                    if (this.last == 0) 
                    {
                        if (this.ranges.Count > 0) 
                        {
                            return sequenceNumber > this.ranges[this.ranges.Count - 1].Upper;
                        }
                        else 
                        {
                            return true; 
                        } 
                    }
                    else 
                    {
                        return sequenceNumber == this.last;
                    }
                } 
                else if (this.last > 0)
                { 
                    return sequenceNumber < this.last; 
                }
            } 
            else
            {
                if (this.isLastKnown)
                { 
                    return this.ranges.Contains(sequenceNumber);
                } 
            } 

            return true; 
        }

        public void Merge(Int64 sequenceNumber, bool isLast)
        { 
            this.ranges = this.ranges.MergeWith(sequenceNumber);
 
            if (isLast) 
                this.last = sequenceNumber;
 
            if (this.AllAdded)
                this.shutdownWaitObject.Set();
        }
 
        public bool SetCloseSequenceLast(Int64 last)
        { 
            WsrmUtilities.AssertWsrm11(this.reliableMessagingVersion); 
            bool validLast;
 
            if ((last < 1) || (this.ranges.Count == 0))
            {
                validLast = true;
            } 
            else
            { 
                validLast = last >= this.ranges[this.ranges.Count - 1].Upper; 
            }
 
            if (validLast)
            {
                this.isSequenceClosed = true;
                this.SetLast(last); 
            }
 
            return validLast; 
        }
 
        void SetLast(Int64 last)
        {
            if (this.isLastKnown)
            { 
                DiagnosticUtility.DebugAssert("Last can only be set once.");
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperInternal(false); 
            } 

            this.last = last; 
            this.isLastKnown = true;
            this.shutdownWaitObject.Set();
        }
 
        // Two error cases:
        // (1) The sequence contains holes. 
        // (2) TerminateSequence.LastMsgNumber < last received message number. 
        // In both cases the channel should be faulted. In case (2) the channel should send a fault.
        public bool SetTerminateSequenceLast(Int64 last, out bool isLastLargeEnough) 
        {
            WsrmUtilities.AssertWsrm11(this.reliableMessagingVersion);
            isLastLargeEnough = true;
 
            // unspecified last
            if (last < 1) 
            { 
                return false;
            } 

            int rangeCount = this.ranges.Count;
            Int64 lastReceived = (rangeCount > 0) ? this.ranges[rangeCount - 1].Upper : 0;
 
            // last is too small to be valid
            if (last < lastReceived) 
            { 
                isLastLargeEnough = false;
                return false; 
            }

            // there is a hole in the sequence
            if ((rangeCount > 1) || (last > lastReceived)) 
            {
                return false; 
            } 

            this.SetLast(last); 
            return true;
        }

        public bool Terminate() 
        {
            if ((this.reliableMessagingVersion == ReliableMessagingVersion.WSReliableMessagingFebruary2005) 
                || this.isSequenceClosed) 
            {
                if (!this.terminated && this.AllAdded) 
                {
                    this.terminateWaitObject.Set();
                    this.terminated = true;
                } 

                return this.terminated; 
            } 

            return this.isLastKnown; 
        }

        public IAsyncResult BeginClose(TimeSpan timeout, AsyncCallback callback, object state)
        { 
            OperationWithTimeoutBeginCallback[] beginCallbacks
                = new OperationWithTimeoutBeginCallback[] {shutdownWaitObject.BeginWait, terminateWaitObject.BeginWait}; 
            OperationEndCallback[] endCallbacks 
                = new OperationEndCallback[] {shutdownWaitObject.EndWait, terminateWaitObject.EndWait};
 
            return OperationWithTimeoutComposer.BeginComposeAsyncOperations(timeout, beginCallbacks, endCallbacks, callback, state);
        }

        public void Close(TimeSpan timeout) 
        {
            TimeoutHelper timeoutHelper = new TimeoutHelper(timeout); 
            this.shutdownWaitObject.Wait(timeoutHelper.RemainingTime()); 
            this.terminateWaitObject.Wait(timeoutHelper.RemainingTime());
        } 

        public void EndClose(IAsyncResult result)
        {
            OperationWithTimeoutComposer.EndComposeAsyncOperations(result); 
        }
    } 
} 

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

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