2 * Copyright (c) 2002-2004 Mainsoft Corporation.
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4 * Permission is hereby granted, free of charge, to any person obtaining a
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5 * copy of this software and associated documentation files (the "Software"),
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6 * to deal in the Software without restriction, including without limitation
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7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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8 * and/or sell copies of the Software, and to permit persons to whom the
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9 * Software is furnished to do so, subject to the following conditions:
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11 * The above copyright notice and this permission notice shall be included in
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12 * all copies or substantial portions of the Software.
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14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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20 * DEALINGS IN THE SOFTWARE.
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24 using System.Collections;
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28 namespace System.Data.Common
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30 #region AbstractDbMetaDataCache
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32 internal abstract class AbstractDbMetaDataCache
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35 const int MINUTES_TIMEOUT = 10;
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36 private long _timestamp;
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38 protected AbstractDbMetaDataCache()
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40 _cache = Hashtable.Synchronized(new Hashtable());
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43 protected Hashtable Cache
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47 long now = DateTime.Now.Ticks;
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48 if (now - _timestamp > MINUTES_TIMEOUT * TimeSpan.TicksPerMinute)
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