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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.ServiceModel.Dispatcher
{
using System;
using System.Diagnostics;
using System.ServiceModel.Diagnostics;
using System.ServiceModel.Channels;
using System.Collections.Generic;
using System.Runtime;
using System.Threading;
sealed class QuotaThrottle
{
int limit;
object mutex;
WaitCallback release;
Queue<object> waiters;
bool didTraceThrottleLimit;
string propertyName = "ManualFlowControlLimit";
string owner;
internal QuotaThrottle(WaitCallback release, object mutex)
{
this.limit = Int32.MaxValue;
this.mutex = mutex;
this.release = release;
this.waiters = new Queue<object>();
}
bool IsEnabled
{
get { return this.limit != Int32.MaxValue; }
}
internal String Owner
{
set { this.owner = value; }
}
internal int Limit
{
get { return this.limit; }
}
internal bool Acquire(object o)
{
lock (this.mutex)
{
if (this.IsEnabled)
{
if (this.limit > 0)
{
this.limit--;
if (this.limit == 0)
{
if (DiagnosticUtility.ShouldTraceWarning && !this.didTraceThrottleLimit)
{
this.didTraceThrottleLimit = true;
TraceUtility.TraceEvent(
TraceEventType.Warning,
TraceCode.ManualFlowThrottleLimitReached,
SR.GetString(SR.TraceCodeManualFlowThrottleLimitReached,
this.propertyName, this.owner));
}
}
return true;
}
else
{
this.waiters.Enqueue(o);
return false;
}
}
else
{
return true;
}
}
}
internal int IncrementLimit(int incrementBy)
{
if (incrementBy < 0)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("incrementBy", incrementBy,
SR.GetString(SR.ValueMustBeNonNegative)));
int newLimit;
object[] released = null;
lock (this.mutex)
{
if (this.IsEnabled)
{
checked { this.limit += incrementBy; }
released = this.LimitChanged();
}
newLimit = this.limit;
}
if (released != null)
this.Release(released);
return newLimit;
}
object[] LimitChanged()
{
object[] released = null;
if (this.IsEnabled)
{
if ((this.waiters.Count > 0) && (this.limit > 0))
{
if (this.limit < this.waiters.Count)
{
released = new object[this.limit];
for (int i = 0; i < this.limit; i++)
released[i] = this.waiters.Dequeue();
this.limit = 0;
}
else
{
released = this.waiters.ToArray();
this.waiters.Clear();
this.waiters.TrimExcess();
this.limit -= released.Length;
}
}
this.didTraceThrottleLimit = false;
}
else
{
released = this.waiters.ToArray();
this.waiters.Clear();
this.waiters.TrimExcess();
}
return released;
}
internal void SetLimit(int messageLimit)
{
if (messageLimit < 0)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("messageLimit", messageLimit,
SR.GetString(SR.ValueMustBeNonNegative)));
object[] released = null;
lock (this.mutex)
{
this.limit = messageLimit;
released = this.LimitChanged();
}
if (released != null)
this.Release(released);
}
void ReleaseAsync(object state)
{
this.release(state);
}
internal void Release(object[] released)
{
for (int i = 0; i < released.Length; i++)
ActionItem.Schedule(this.ReleaseAsync, released[i]);
}
}
}
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