corrade-vassal – Rev 1
?pathlinks?
/*
* Copyright (c) Microsoft Corporation
* All rights reserved.
*
* - Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* - Neither the name of the openmetaverse.org nor the names
* of its contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
namespace OpenMetaverse
{
public class Lazy<T>
{
private T _value = default(T);
private volatile bool _isValueCreated = false;
private Func<T> _valueFactory = null;
private object _lock;
public bool IsValueCreated { get { return _isValueCreated; } }
public Lazy()
: this(() => Activator.CreateInstance<T>())
{
}
public Lazy(bool isThreadSafe)
: this(() => Activator.CreateInstance<T>(), isThreadSafe)
{
}
public Lazy(Func<T> valueFactory) :
this(valueFactory, true)
{
}
public Lazy(Func<T> valueFactory, bool isThreadSafe)
{
if (isThreadSafe)
{
this._lock = new object();
}
this._valueFactory = valueFactory;
}
public T Value
{
get
{
if (!this._isValueCreated)
{
if (this._lock != null)
{
Monitor.Enter(this._lock);
}
try
{
T value = this._valueFactory.Invoke();
this._valueFactory = null;
Thread.MemoryBarrier();
this._value = value;
this._isValueCreated = true;
}
finally
{
if (this._lock != null)
{
Monitor.Exit(this._lock);
}
}
}
return this._value;
}
}
}
}