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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.ServiceModel.Activities
{
using System;
using System.Collections.Generic;
using System.Runtime;
using System.Runtime.Collections;
public sealed class SendMessageChannelCache : IDisposable, ICancelable
{
static Func<SendMessageChannelCache> defaultExtensionProvider = new Func<SendMessageChannelCache>(CreateDefaultExtension);
ChannelCacheSettings channelCacheSettings;
ChannelCacheSettings factoryCacheSettings;
bool isReadOnly;
bool allowUnsafeCaching;
bool isDisposed;
ObjectCache<InternalSendMessage.FactoryCacheKey, InternalSendMessage.ChannelFactoryReference> factoryCache;
object thisLock;
public SendMessageChannelCache()
: this(null, null, ChannelCacheDefaults.DefaultAllowUnsafeSharing)
{
}
public SendMessageChannelCache(ChannelCacheSettings factorySettings, ChannelCacheSettings channelSettings) :
this(factorySettings, channelSettings, ChannelCacheDefaults.DefaultAllowUnsafeSharing)
{
}
// use the default settings if null is specified for FactoryCacheSettings or ChannelCacheSettings
public SendMessageChannelCache(ChannelCacheSettings factorySettings, ChannelCacheSettings channelSettings, bool allowUnsafeCaching)
{
this.allowUnsafeCaching = allowUnsafeCaching;
this.FactorySettings = factorySettings;
this.ChannelSettings = channelSettings;
this.thisLock = new Object();
}
internal static Func<SendMessageChannelCache> DefaultExtensionProvider
{
get
{
return defaultExtensionProvider;
}
}
public bool AllowUnsafeCaching
{
get
{
return this.allowUnsafeCaching;
}
set
{
ThrowIfReadOnly();
this.allowUnsafeCaching = value;
}
}
public ChannelCacheSettings ChannelSettings
{
get
{
return this.channelCacheSettings;
}
set
{
ThrowIfReadOnly();
if (value == null)
{
this.channelCacheSettings = new ChannelCacheSettings { LeaseTimeout = ChannelCacheDefaults.DefaultChannelLeaseTimeout };
}
else
{
this.channelCacheSettings = value;
}
}
}
public ChannelCacheSettings FactorySettings
{
get
{
return this.factoryCacheSettings;
}
set
{
ThrowIfReadOnly();
if (value == null)
{
this.factoryCacheSettings = new ChannelCacheSettings { LeaseTimeout = ChannelCacheDefaults.DefaultFactoryLeaseTimeout };
}
else
{
this.factoryCacheSettings = value;
}
}
}
static SendMessageChannelCache CreateDefaultExtension()
{
SendMessageChannelCache defaultExtension = new SendMessageChannelCache();
defaultExtension.FactorySettings.LeaseTimeout = ChannelCacheDefaults.DefaultFactoryLeaseTimeout;
defaultExtension.ChannelSettings.LeaseTimeout = ChannelCacheDefaults.DefaultChannelLeaseTimeout;
return defaultExtension;
}
// factory cache will be created on first usage after which the settings are immutable
internal ObjectCache<InternalSendMessage.FactoryCacheKey, InternalSendMessage.ChannelFactoryReference> GetFactoryCache()
{
if (this.factoryCache == null)
{
this.isReadOnly = true;
lock (thisLock)
{
ThrowIfDisposed();
if (this.factoryCache == null)
{
// we don't need to set DisposeItemCallback since InternalSendMessage.ChannelFactoryReference is IDisposable
ObjectCacheSettings objectCacheSettings = new ObjectCacheSettings
{
CacheLimit = this.FactorySettings.MaxItemsInCache,
IdleTimeout = this.FactorySettings.IdleTimeout,
LeaseTimeout = this.FactorySettings.LeaseTimeout
};
this.factoryCache = new ObjectCache<InternalSendMessage.FactoryCacheKey, InternalSendMessage.ChannelFactoryReference>(objectCacheSettings);
}
}
}
return this.factoryCache;
}
void ThrowIfReadOnly()
{
if (this.isReadOnly)
{
// cache has already been created, settings cannot be changed now
throw FxTrace.Exception.AsError(new InvalidOperationException(SR.CacheSettingsLocked));
}
}
public void Dispose()
{
// Close the ChannelFactory and the Channels
// SendMessageChannelCache cannot be used after Dispose is called
if (!this.isDisposed)
{
lock (thisLock)
{
if (!this.isDisposed)
{
if (this.factoryCache != null)
{
this.factoryCache.Dispose();
}
this.isDisposed = true;
}
}
}
}
void ICancelable.Cancel()
{
Dispose();
}
void ThrowIfDisposed()
{
if (this.isDisposed == true)
{
throw FxTrace.Exception.AsError(new ObjectDisposedException(typeof(SendMessageChannelCache).ToString()));
}
}
}
}
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