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//----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
namespace System.ServiceModel.Channels
{
using System.Runtime;
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)
{
throw Fx.AssertAndThrow("Last can only be set once.");
}
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);
}
}
}
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