347 lines
9.3 KiB
C#
347 lines
9.3 KiB
C#
// CoreUtil
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//
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// Copyright (C) 2012-2014 Daiyuu Nobori. All Rights Reserved.
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// Copyright (C) 2012-2014 SoftEther VPN Project at University of Tsukuba. All Rights Reserved.
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// Comments: Tetsuo Sugiyama, Ph.D.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// version 2 as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License version 2
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// THE LICENSE AGREEMENT IS ATTACHED ON THE SOURCE-CODE PACKAGE
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// AS "LICENSE.TXT" FILE. READ THE TEXT FILE IN ADVANCE TO USE THE SOFTWARE.
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//
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//
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// THIS SOFTWARE IS DEVELOPED IN JAPAN, AND DISTRIBUTED FROM JAPAN,
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// UNDER JAPANESE LAWS. YOU MUST AGREE IN ADVANCE TO USE, COPY, MODIFY,
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// MERGE, PUBLISH, DISTRIBUTE, SUBLICENSE, AND/OR SELL COPIES OF THIS
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// SOFTWARE, THAT ANY JURIDICAL DISPUTES WHICH ARE CONCERNED TO THIS
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// SOFTWARE OR ITS CONTENTS, AGAINST US (SOFTETHER PROJECT, SOFTETHER
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// CORPORATION, DAIYUU NOBORI OR OTHER SUPPLIERS), OR ANY JURIDICAL
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// DISPUTES AGAINST US WHICH ARE CAUSED BY ANY KIND OF USING, COPYING,
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// MODIFYING, MERGING, PUBLISHING, DISTRIBUTING, SUBLICENSING, AND/OR
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// SELLING COPIES OF THIS SOFTWARE SHALL BE REGARDED AS BE CONSTRUED AND
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// CONTROLLED BY JAPANESE LAWS, AND YOU MUST FURTHER CONSENT TO
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// EXCLUSIVE JURISDICTION AND VENUE IN THE COURTS SITTING IN TOKYO,
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// JAPAN. YOU MUST WAIVE ALL DEFENSES OF LACK OF PERSONAL JURISDICTION
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// AND FORUM NON CONVENIENS. PROCESS MAY BE SERVED ON EITHER PARTY IN
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// THE MANNER AUTHORIZED BY APPLICABLE LAW OR COURT RULE.
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//
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// USE ONLY IN JAPAN. DO NOT USE THIS SOFTWARE IN ANOTHER COUNTRY UNLESS
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// YOU HAVE A CONFIRMATION THAT THIS SOFTWARE DOES NOT VIOLATE ANY
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// CRIMINAL LAWS OR CIVIL RIGHTS IN THAT PARTICULAR COUNTRY. USING THIS
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// SOFTWARE IN OTHER COUNTRIES IS COMPLETELY AT YOUR OWN RISK. THE
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// SOFTETHER VPN PROJECT HAS DEVELOPED AND DISTRIBUTED THIS SOFTWARE TO
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// COMPLY ONLY WITH THE JAPANESE LAWS AND EXISTING CIVIL RIGHTS INCLUDING
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// PATENTS WHICH ARE SUBJECTS APPLY IN JAPAN. OTHER COUNTRIES' LAWS OR
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// CIVIL RIGHTS ARE NONE OF OUR CONCERNS NOR RESPONSIBILITIES. WE HAVE
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// NEVER INVESTIGATED ANY CRIMINAL REGULATIONS, CIVIL LAWS OR
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// INTELLECTUAL PROPERTY RIGHTS INCLUDING PATENTS IN ANY OF OTHER 200+
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// COUNTRIES AND TERRITORIES. BY NATURE, THERE ARE 200+ REGIONS IN THE
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// WORLD, WITH DIFFERENT LAWS. IT IS IMPOSSIBLE TO VERIFY EVERY
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// COUNTRIES' LAWS, REGULATIONS AND CIVIL RIGHTS TO MAKE THE SOFTWARE
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// COMPLY WITH ALL COUNTRIES' LAWS BY THE PROJECT. EVEN IF YOU WILL BE
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// SUED BY A PRIVATE ENTITY OR BE DAMAGED BY A PUBLIC SERVANT IN YOUR
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// COUNTRY, THE DEVELOPERS OF THIS SOFTWARE WILL NEVER BE LIABLE TO
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// RECOVER OR COMPENSATE SUCH DAMAGES, CRIMINAL OR CIVIL
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// RESPONSIBILITIES. NOTE THAT THIS LINE IS NOT LICENSE RESTRICTION BUT
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// JUST A STATEMENT FOR WARNING AND DISCLAIMER.
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//
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//
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// SOURCE CODE CONTRIBUTION
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// ------------------------
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//
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// Your contribution to SoftEther VPN Project is much appreciated.
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// Please send patches to us through GitHub.
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// Read the SoftEther VPN Patch Acceptance Policy in advance:
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// http://www.softether.org/5-download/src/9.patch
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//
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//
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// DEAR SECURITY EXPERTS
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// ---------------------
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//
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// If you find a bug or a security vulnerability please kindly inform us
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// about the problem immediately so that we can fix the security problem
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// to protect a lot of users around the world as soon as possible.
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//
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// Our e-mail address for security reports is:
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// softether-vpn-security [at] softether.org
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//
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// Please note that the above e-mail address is not a technical support
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// inquiry address. If you need technical assistance, please visit
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// http://www.softether.org/ and ask your question on the users forum.
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//
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// Thank you for your cooperation.
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//
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//
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// NO MEMORY OR RESOURCE LEAKS
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// ---------------------------
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//
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// The memory-leaks and resource-leaks verification under the stress
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// test has been passed before release this source code.
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using System;
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using System.Threading;
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using System.Data;
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using System.Data.Sql;
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using System.Data.SqlClient;
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using System.Data.SqlTypes;
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using System.Text;
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using System.Configuration;
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using System.Collections;
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using System.Collections.Generic;
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using System.Security.Cryptography;
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using System.Web;
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using System.Web.Security;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.WebControls.WebParts;
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using System.Web.UI.HtmlControls;
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using System.IO;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.Drawing.Drawing2D;
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using System.Diagnostics;
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using System.Web.Mail;
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using System.Net;
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using System.Net.Sockets;
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using System.Net.NetworkInformation;
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namespace CoreUtil
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{
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public enum CacheType
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{
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UpdateExpiresWhenAccess = 0,
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DoNotUpdateExpiresWhenAccess = 1,
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}
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public class Cache<TKey, TValue>
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{
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class Entry
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{
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DateTime createdDateTime;
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public DateTime CreatedDateTime
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{
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get { return createdDateTime; }
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}
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DateTime updatedDateTime;
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public DateTime UpdatedDateTime
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{
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get { return updatedDateTime; }
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}
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DateTime lastAccessedDateTime;
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public DateTime LastAccessedDateTime
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{
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get { return lastAccessedDateTime; }
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}
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TKey key;
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public TKey Key
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{
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get
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{
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return key;
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}
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}
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TValue value;
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public TValue Value
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{
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get
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{
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lastAccessedDateTime = Time.NowDateTime;
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return this.value;
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}
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set
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{
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this.value = value;
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updatedDateTime = Time.NowDateTime;
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lastAccessedDateTime = Time.NowDateTime;
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}
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}
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public Entry(TKey key, TValue value)
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{
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this.key = key;
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this.value = value;
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lastAccessedDateTime = updatedDateTime = createdDateTime = Time.NowDateTime;
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}
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public override int GetHashCode()
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{
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return key.GetHashCode();
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}
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public override string ToString()
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{
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return key.ToString() + "," + value.ToString();
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}
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}
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public static readonly TimeSpan DefaultExpireSpan = new TimeSpan(0, 5, 0);
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public const CacheType DefaultCacheType = CacheType.UpdateExpiresWhenAccess;
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TimeSpan expireSpan;
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public TimeSpan ExpireSpan
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{
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get { return expireSpan; }
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}
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CacheType type;
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public CacheType Type
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{
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get { return type; }
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}
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Dictionary<TKey, Entry> list;
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object lockObj;
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public Cache()
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{
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init(DefaultExpireSpan, DefaultCacheType);
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}
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public Cache(CacheType type)
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{
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init(DefaultExpireSpan, type);
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}
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public Cache(TimeSpan expireSpan)
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{
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init(expireSpan, DefaultCacheType);
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}
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public Cache(TimeSpan expireSpan, CacheType type)
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{
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init(expireSpan, type);
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}
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void init(TimeSpan expireSpan, CacheType type)
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{
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this.expireSpan = expireSpan;
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this.type = type;
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list = new Dictionary<TKey, Entry>();
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lockObj = new object();
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}
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public void Add(TKey key, TValue value)
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{
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lock (lockObj)
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{
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Entry e;
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deleteExpired();
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if (list.ContainsKey(key) == false)
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{
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e = new Entry(key, value);
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list.Add(e.Key, e);
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deleteExpired();
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}
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else
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{
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e = list[key];
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e.Value = value;
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}
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}
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}
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public void Delete(TKey key)
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{
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lock (lockObj)
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{
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if (list.ContainsKey(key))
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{
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list.Remove(key);
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}
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}
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}
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public TValue this[TKey key]
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{
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get
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{
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lock (lockObj)
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{
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deleteExpired();
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if (list.ContainsKey(key) == false)
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{
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return default(TValue);
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}
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return list[key].Value;
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}
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}
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}
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static long last_deleted = 0;
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void deleteExpired()
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{
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bool do_delete = false;
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long now = Tick64.Value;
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long delete_inveral = expireSpan.Milliseconds / 10;
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lock (lockObj)
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{
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if (last_deleted == 0 || now > (last_deleted + delete_inveral))
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{
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last_deleted = now;
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do_delete = true;
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}
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}
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if (do_delete == false)
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{
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return;
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}
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lock (lockObj)
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{
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List<Entry> o = new List<Entry>();
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DateTime expire = Time.NowDateTime - this.expireSpan;
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foreach (Entry e in list.Values)
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{
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if (this.type == CacheType.UpdateExpiresWhenAccess)
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{
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if (e.LastAccessedDateTime < expire)
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{
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o.Add(e);
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}
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}
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else
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{
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if (e.UpdatedDateTime < expire)
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{
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o.Add(e);
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}
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}
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}
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foreach (Entry e in o)
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{
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list.Remove(e.Key);
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}
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}
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}
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}
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}
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