[766] | 1 | /* |
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| 2 | Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. |
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| 3 | |
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| 4 | The MySQL Connector/J is licensed under the terms of the GPLv2 |
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| 5 | <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors. |
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| 6 | There are special exceptions to the terms and conditions of the GPLv2 as it is applied to |
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| 7 | this software, see the FLOSS License Exception |
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| 8 | <http://www.mysql.com/about/legal/licensing/foss-exception.html>. |
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| 9 | |
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| 10 | This program is free software; you can redistribute it and/or modify it under the terms |
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| 11 | of the GNU General Public License as published by the Free Software Foundation; version 2 |
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| 12 | of the License. |
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| 13 | |
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| 14 | This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; |
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| 15 | without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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| 16 | See the GNU General Public License for more details. |
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| 17 | |
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| 18 | You should have received a copy of the GNU General Public License along with this |
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| 19 | program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth |
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| 20 | Floor, Boston, MA 02110-1301 USA |
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| 21 | |
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| 22 | */ |
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| 23 | |
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| 24 | package com.mysql.jdbc; |
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| 25 | |
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| 26 | import java.sql.SQLException; |
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| 27 | import java.util.Properties; |
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| 28 | |
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| 29 | import com.mysql.jdbc.PreparedStatement.ParseInfo; |
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| 30 | import com.mysql.jdbc.util.LRUCache; |
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| 31 | |
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| 32 | public class PerConnectionLRUFactory implements CacheAdapterFactory<String, ParseInfo> { |
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| 33 | |
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| 34 | public CacheAdapter<String, ParseInfo> getInstance(Connection forConnection, |
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| 35 | String url, int cacheMaxSize, int maxKeySize, |
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| 36 | Properties connectionProperties) throws SQLException { |
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| 37 | |
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| 38 | return new PerConnectionLRU(forConnection, cacheMaxSize, maxKeySize); |
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| 39 | } |
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| 40 | |
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| 41 | class PerConnectionLRU implements CacheAdapter<String, ParseInfo> { |
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| 42 | private final int cacheSqlLimit; |
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| 43 | private final LRUCache cache; |
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| 44 | private final Connection conn; |
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| 45 | |
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| 46 | protected PerConnectionLRU(Connection forConnection, int cacheMaxSize, |
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| 47 | int maxKeySize) { |
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| 48 | final int cacheSize = cacheMaxSize; |
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| 49 | cacheSqlLimit = maxKeySize; |
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| 50 | cache = new LRUCache(cacheSize); |
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| 51 | conn = forConnection; |
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| 52 | } |
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| 53 | |
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| 54 | public ParseInfo get(String key) { |
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| 55 | if (key == null || key.length() > cacheSqlLimit) { |
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| 56 | return null; |
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| 57 | } |
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| 58 | |
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| 59 | synchronized (conn) { |
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| 60 | return (ParseInfo) cache.get(key); |
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| 61 | } |
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| 62 | } |
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| 63 | |
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| 64 | public void put(String key, ParseInfo value) { |
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| 65 | if (key == null || key.length() > cacheSqlLimit) { |
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| 66 | return; |
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| 67 | } |
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| 68 | |
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| 69 | synchronized (conn) { |
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| 70 | cache.put(key, value); |
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| 71 | } |
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| 72 | } |
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| 73 | } |
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| 74 | } |
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