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git-svn-id: http://code.alibabatech.com/svn/druid/trunk@922 b9813039-fb51-4c41-a8b9-e21c2acb5095
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wenshao
2011-09-29 02:22:28 +00:00
parent 7ef38314ba
commit 508a6aab09
5 changed files with 33 additions and 38 deletions
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src/main/java/com/alibaba/druid/pool/PreparedStatementPool.java
+22 -8
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@@ -15,11 +15,11 @@
*/
package com.alibaba.druid.pool;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import com.alibaba.druid.pool.PoolablePreparedStatement.PreparedStatementKey;
import com.alibaba.druid.util.LRUCache;
/**
* @author wenshao<szujobs@hotmail.com>
@@ -27,13 +27,15 @@ import com.alibaba.druid.util.LRUCache;
public class PreparedStatementPool {
private final Map<PreparedStatementKey, PreparedStatementHolder> map;
private final DruidAbstractDataSource dataSource;
public PreparedStatementPool(int maxSize){
if (maxSize < 0) {
map = new HashMap<PreparedStatementKey, PreparedStatementHolder>(maxSize);
} else {
map = new LRUCache<PreparedStatementKey, PreparedStatementHolder>(maxSize);
public PreparedStatementPool(ConnectionHolder holder){
this.dataSource = holder.getDataSource();
int initCapacity = holder.getDataSource().getMaxPoolPreparedStatementPerConnectionSize();
if (initCapacity <= 0) {
initCapacity = 16;
}
map = new LRUCache<PreparedStatementKey, PreparedStatementHolder>(initCapacity);
}
public static enum MethodType {
@@ -46,7 +48,7 @@ public class PreparedStatementPool {
if (holder != null) {
holder.incrementReusedCount();
}
return holder;
}
@@ -59,4 +61,16 @@ public class PreparedStatementPool {
return map;
}
public class LRUCache<K, V> extends LinkedHashMap<K, V> {
private static final long serialVersionUID = 1L;
public LRUCache(int maxSize){
super(maxSize);
}
protected boolean removeEldestEntry(Entry<K, V> eldest) {
return (size() > dataSource.getMaxPoolPreparedStatementPerConnectionSize());
}
}
}