/*
Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
The MySQL Connector/J is licensed under the terms of the GPLv2
<http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
this software, see the FLOSS License Exception
<http://www.mysql.com/about/legal/licensing/foss-exception.html>.
This program is free software; you can redistribute it and/or modify it under the terms
of the GNU General Public License as published by the Free Software Foundation; version 2
of the License.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this
program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.jdbc;
import java.sql.SQLException;
import java.util.Properties;
import java.util.Set;
import com.mysql.jdbc.PreparedStatement.ParseInfo;
import com.mysql.jdbc.util.LRUCache;
public class PerConnectionLRUFactory implements CacheAdapterFactory<String, ParseInfo> {
public CacheAdapter<String, ParseInfo> getInstance(Connection forConnection,
String url, int cacheMaxSize, int maxKeySize,
Properties connectionProperties) throws SQLException {
return new PerConnectionLRU(forConnection, cacheMaxSize, maxKeySize);
}
class PerConnectionLRU implements CacheAdapter<String, ParseInfo> {
private final int cacheSqlLimit;
private final LRUCache cache;
private final Connection conn;
protected PerConnectionLRU(Connection forConnection, int cacheMaxSize,
int maxKeySize) {
final int cacheSize = cacheMaxSize;
cacheSqlLimit = maxKeySize;
cache = new LRUCache(cacheSize);
conn = forConnection;
}
public ParseInfo get(String key) {
if (key == null || key.length() > cacheSqlLimit) {
return null;
}
synchronized (conn.getConnectionMutex()) {
return (ParseInfo) cache.get(key);
}
}
public void put(String key, ParseInfo value) {
if (key == null || key.length() > cacheSqlLimit) {
return;
}
synchronized (conn.getConnectionMutex()) {
cache.put(key, value);
}
}
public void invalidate(String key) {
synchronized (conn.getConnectionMutex()) {
cache.remove(key);
}
}
public void invalidateAll(Set<String> keys) {
synchronized (conn.getConnectionMutex()) {
for (String key : keys) {
cache.remove(key);
}
}
}
public void invalidateAll() {
synchronized (conn.getConnectionMutex()) {
cache.clear();
}
}
}
}