Êý¾Ý¿âÁ¬½Ó³ØÔÚ±àдӦÓ÷þÎñÊǾ³£ÐèÒªÓõ½µÄÄ£¿é£¬Ì«¹ýƵ·±µÄÁ¬½ÓÊý¾Ý¿â¶Ô·þÎñÐÔÄÜÀ´½²ÊÇÒ»¸öÆ¿¾±£¬Ê¹Óûº³å³Ø¼¼Êõ¿ÉÒÔÀ´Ïû³ýÕâ¸öÆ¿¾±¡£ÎÒÃÇ¿ÉÒÔÔÚ»¥ÁªÍøÉÏÕÒµ½ºÜ¶à¹ØÓÚÊý¾Ý¿âÁ¬½Ó³ØµÄÔ´³ÌÐò£¬µ«ÊǶ¼·¢ÏÖÕâÑùÒ»¸ö¹²Í¬µÄÎÊÌ⣺ÕâЩÁ¬½Ó³ØµÄʵÏÖ·½·¨¶¼²»Í¬³Ì¶ÈµØÔö¼ÓÁËÓëʹÓÃÕßÖ®¼äµÄñîºÏ¶È¡£ºÜ¶àµÄÁ¬½Ó³Ø¶¼ÒªÇóÓû§Í¨¹ýÆä¹æ¶¨µÄ·½·¨»ñÈ¡Êý¾Ý¿âµÄÁ¬½Ó£¬ÕâÒ»µãÎÒÃÇ¿ÉÒÔÀí½â£¬±Ï¾¹Ä¿Ç°ËùÓеÄÓ¦Ó÷þÎñÆ÷È¡Êý¾Ý¿âÁ¬½ÓµÄ·½Ê½¶¼ÊÇÕâÖÖ·½Ê½ÊµÏֵġ£µ«ÊÇÁíÍâÒ»¸ö¹²Í¬µÄÎÊÌâÊÇ£¬ËüÃÇͬʱ²»ÔÊÐíʹÓÃÕßÏÔʽµÄµ÷ÓÃConnection.close()·½·¨£¬¶øÐèÒªÓÃÆä¹æ¶¨µÄÒ»¸ö·½·¨À´¹Ø±ÕÁ¬½Ó¡£ÕâÖÖ×ö·¨ÓÐÁ½¸öȱµã£º
µÚÒ»£º¸Ä±äÁËÓû§Ê¹ÓÃϰ¹ß£¬Ôö¼ÓÁËÓû§µÄʹÓÃÄѶȡ£
Ê×ÏÈÎÒÃÇÀ´¿´¿´Ò»¸öÕý³£µÄÊý¾Ý¿â²Ù×÷¹ý³Ì£º
int executeSQL(String sql) throws SQLException
{
Connection conn = getConnection(); //ͨ¹ýijÖÖ·½Ê½»ñÈ¡Êý¾Ý¿âÁ¬½Ó
PreparedStatement ps = null;
int res = 0;
try{
ps = conn.prepareStatement(sql);
res = ps.executeUpdate();
}finally{
try{
ps.close();
}catch(Exception e){}
try{
conn.close();//
}catch(Exception e){}
}
return res;
}
|
ʹÓÃÕßÔÚÓÃÍêÊý¾Ý¿âÁ¬½Óºóͨ³£ÊÇÖ±½Óµ÷ÓÃÁ¬½ÓµÄ·½·¨closeÀ´ÊÍ·ÅÊý¾Ý¿â×ÊÔ´£¬Èç¹ûÓÃÎÒÃÇÇ°ÃæÌáµ½µÄÁ¬½Ó³ØµÄʵÏÖ·½·¨£¬ÄÇÓï¾äconn.close()½«±»Ä³Ð©Ìض¨µÄÓï¾äËùÌæ´ú¡£
µÚ¶þ£ºÊ¹Á¬½Ó³ØÎÞ·¨¶ÔÖ®ÖеÄËùÓÐÁ¬½Ó½øÐжÀÕ¼¿ØÖÆ¡£ÓÉÓÚÁ¬½Ó³Ø²»ÔÊÐíÓû§Ö±½Óµ÷ÓÃÁ¬½ÓµÄclose·½·¨£¬Ò»µ©Ê¹ÓÃÕßÔÚʹÓõĹý³ÌÖÐÓÉÓÚϰ¹ßÎÊÌâÖ±½Ó¹Ø±ÕÁËÊý¾Ý¿âÁ¬½Ó£¬ÄÇôÁ¬½Ó³Ø½«ÎÞ·¨Õý³£Î¬»¤ËùÓÐÁ¬½ÓµÄ״̬£¬¿¼ÂÇÁ¬½Ó³ØºÍÓ¦ÓÃÓɲ»Í¬¿ª·¢ÈËԱʵÏÖʱÕâÖÖÎÊÌâ¸üÈÝÒ׳öÏÖ¡£
×ÛºÏÉÏÃæÌáµ½µÄÁ½¸öÎÊÌ⣬ÎÒÃÇÀ´ÌÖÂÛÒ»ÏÂÈçºÎ½â¾öÕâÁ½¸öÒªÃüµÄÎÊÌâ¡£
Ê×ÏÈÎÒÃÇÏÈÉèÉí´¦µØµÄ¿¼ÂÇÒ»ÏÂÓû§ÊÇÏëÔõôÑùÀ´Ê¹ÓÃÕâ¸öÊý¾Ý¿âÁ¬½Ó³ØµÄ¡£Óû§¿ÉÒÔͨ¹ýÌØ¶¨µÄ·½·¨À´»ñÈ¡Êý¾Ý¿âµÄÁ¬½Ó£¬Í¬Ê±Õâ¸öÁ¬½ÓµÄÀàÐÍÓ¦¸ÃÊDZê×¼µÄjava.sql.Connection¡£Óû§ÔÚ»ñÈ¡µ½Õâ¸öÊý¾Ý¿âÁ¬½Óºó¿ÉÒÔ¶ÔÕâ¸öÁ¬½Ó½øÐÐÈÎÒâµÄ²Ù×÷£¬°üÀ¨¹Ø±ÕÁ¬½ÓµÈ¡£
ͨ¹ý¶ÔÓû§Ê¹ÓõÄÃèÊö£¬ÔõÑù¿ÉÒÔ½Ó¹ÜConnection.close·½·¨¾Í³ÉÁËÎÒÃÇÕâÆªÎÄÕµÄÖ÷Ìâ¡£
ΪÁ˽ӹÜÊý¾Ý¿âÁ¬½ÓµÄclose·½·¨£¬ÎÒÃÇÓ¦¸ÃÓÐÒ»ÖÖÀàËÆÓÚ¹³×ӵĻúÖÆ¡£ÀýÈçÔÚWindows±à³ÌÖÐÎÒÃÇ¿ÉÒÔÀûÓ**ook APIÀ´ÊµÏÖ¶Ôij¸öWindows APIµÄ½Ó¹Ü¡£ÔÚJAVAÖÐͬÑùÒ²ÓÐÕâÑùÒ»¸ö»úÖÆ¡£JAVAÌṩÁËÒ»¸öProxyÀàºÍÒ»¸öInvocationHandler£¬ÕâÁ½¸öÀà¶¼ÔÚjava.lang.reflect°üÖС£ÎÒÃÇÏÈÀ´¿´¿´SUN¹«Ë¾ÌṩµÄÎĵµÊÇÔõôÃèÊöÕâÁ½¸öÀàµÄ¡£
public interface InvocationHandler
InvocationHandler is the interface implemented by the invocation handler of a proxy instance.
Each proxy instance has an associated invocation handler.
When a method is invoked on a proxy instance,
the method invocation is encoded and dispatched to the invoke method of its invocation handler.
|
SUNµÄAPIÎĵµÖйØÓÚProxyµÄÃèÊöºÜ¶à£¬ÕâÀï¾Í²»ÂÞÁгöÀ´¡£Í¨¹ýÎĵµ¶Ô½Ó¿ÚInvocationHandlerµÄÃèÊöÎÒÃÇ¿ÉÒÔ¿´µ½µ±µ÷ÓÃÒ»¸öProxyʵÀýµÄ·½·¨Ê±»á´¥·¢InvocationhanlderµÄinvoke·½·¨¡£´ÓJAVAµÄÎĵµÖÐÎÒÃÇҲͬʱÁ˽⵽ÕâÖÖ¶¯Ì¬´úÀí»úÖÆÖ»Äܽӹܽӿڵķ½·¨£¬¶ø¶ÔÒ»°ãµÄÀàÎÞЧ£¬¿¼Âǵ½java.sql.Connection±¾ÉíÒ²ÊÇÒ»¸ö½Ó¿ÚÓɴ˾ÍÕÒµ½Á˽â¾öÈçºÎ½Ó¹Üclose·½·¨µÄ³ö·¡£
Ê×ÏÈ£¬ÎÒÃÇÏȶ¨ÒåÒ»¸öÊý¾Ý¿âÁ¬½Ó³Ø²ÎÊýµÄÀ࣬¶¨ÒåÁËÊý¾Ý¿âµÄJDBCÇý¶¯³ÌÐòÀàÃû£¬Á¬½ÓµÄURLÒÔ¼°Óû§Ãû¿ÚÁîµÈµÈһЩÐÅÏ¢£¬¸ÃÀàÊÇÓÃÓÚ³õʼ»¯Á¬½Ó³ØµÄ²ÎÊý£¬¾ßÌ嶨ÒåÈçÏ£º
public class ConnectionParam implements Serializable
{
private String driver; //Êý¾Ý¿âÇý¶¯³ÌÐò
private String url; //Êý¾ÝÁ¬½ÓµÄURL
private String user; //Êý¾Ý¿âÓû§Ãû
private String password; //Êý¾Ý¿âÃÜÂë
private int minConnection = 0; //³õʼ»¯Á¬½ÓÊý
private int maxConnection = 50; //×î´óÁ¬½ÓÊý
private long timeoutValue = 600000;//Á¬½ÓµÄ×î´ó¿ÕÏÐʱ¼ä
private long waitTime = 30000; //È¡Á¬½ÓµÄʱºòÈç¹ûûÓпÉÓÃÁ¬½Ó×î´óµÄµÈ´ýʱ¼ä
|
Æä´ÎÊÇÁ¬½Ó³ØµÄ¹¤³§ÀàConnectionFactory£¬Í¨¹ý¸ÃÀàÀ´½«Ò»¸öÁ¬½Ó³Ø¶ÔÏóÓëÒ»¸öÃû³Æ¶ÔÓ¦ÆðÀ´£¬Ê¹ÓÃÕßͨ¹ý¸ÃÃû³Æ¾Í¿ÉÒÔ»ñȡָ¶¨µÄÁ¬½Ó³Ø¶ÔÏ󣬾ßÌå´úÂëÈçÏ£º
/**
* Á¬½Ó³ØÀà³§£¬¸ÃÀà³£ÓÃÀ´±£´æ¶à¸öÊý¾ÝÔ´Ãû³ÆºÏÊý¾Ý¿âÁ¬½Ó³Ø¶ÔÓ¦µÄ¹þÏ£
* @author liusoft
*/
public class ConnectionFactory
{
//¸Ã¹þÏ£±íÓÃÀ´±£´æÊý¾ÝÔ´ÃûºÍÁ¬½Ó³Ø¶ÔÏóµÄ¹ØÏµ±í
static Hashtable connectionPools = null;
static{
connectionPools = new Hashtable(2,0.75F);
}
/**
* ´ÓÁ¬½Ó³Ø¹¤³§Öлñȡָ¶¨Ãû³Æ¶ÔÓ¦µÄÁ¬½Ó³Ø¶ÔÏó
* @param dataSource Á¬½Ó³Ø¶ÔÏó¶ÔÓ¦µÄÃû³Æ
* @return DataSource ·µ»ØÃû³Æ¶ÔÓ¦µÄÁ¬½Ó³Ø¶ÔÏó
* @throws NameNotFoundException ÎÞ·¨ÕÒµ½Ö¸¶¨µÄÁ¬½Ó³Ø
*/
public static DataSource lookup(String dataSource)
throws NameNotFoundException
{
Object ds = null;
ds = connectionPools.get(dataSource);
if(ds == null || !(ds instanceof DataSource))
throw new NameNotFoundException(dataSource);
return (DataSource)ds;
}
/**
* ½«Ö¸¶¨µÄÃû×ÖºÍÊý¾Ý¿âÁ¬½ÓÅäÖðó¶¨ÔÚÒ»Æð²¢³õʼ»¯Êý¾Ý¿âÁ¬½Ó³Ø
* @param name ¶ÔÓ¦Á¬½Ó³ØµÄÃû³Æ
* @param param Á¬½Ó³ØµÄÅäÖòÎÊý£¬¾ßÌåÇë¼ûÀàConnectionParam
* @return DataSource Èç¹û°ó¶¨³É¹¦ºó·µ»ØÁ¬½Ó³Ø¶ÔÏó
* @throws NameAlreadyBoundException Ò»¶¨Ãû×ÖnameÒѾ°ó¶¨ÔòÅ׳ö¸ÃÒì³£
* @throws ClassNotFoundException ÎÞ·¨ÕÒµ½Á¬½Ó³ØµÄÅäÖÃÖеÄÇý¶¯³ÌÐòÀà
* @throws IllegalAccessException Á¬½Ó³ØÅäÖÃÖеÄÇý¶¯³ÌÐòÀàÓÐÎó
* @throws InstantiationException ÎÞ·¨ÊµÀý»¯Çý¶¯³ÌÐòÀà
* @throws SQLException ÎÞ·¨Õý³£Á¬½ÓÖ¸¶¨µÄÊý¾Ý¿â
*/
public static DataSource bind(String name, ConnectionParam param)
throws NameAlreadyBoundException,ClassNotFoundException,
IllegalAccessException,InstantiationException,SQLException
{
DataSourceImpl source = null;
try{
lookup(name);
throw new NameAlreadyBoundException(name);
}catch(NameNotFoundException e){
source = new DataSourceImpl(param);
source.initConnection();
connectionPools.put(name, source);
}
return source;
}
/**
* ÖØÐ°ó¶¨Êý¾Ý¿âÁ¬½Ó³Ø
* @param name ¶ÔÓ¦Á¬½Ó³ØµÄÃû³Æ
* @param param Á¬½Ó³ØµÄÅäÖòÎÊý£¬¾ßÌåÇë¼ûÀàConnectionParam
* @return DataSource Èç¹û°ó¶¨³É¹¦ºó·µ»ØÁ¬½Ó³Ø¶ÔÏó
* @throws NameAlreadyBoundException Ò»¶¨Ãû×ÖnameÒѾ°ó¶¨ÔòÅ׳ö¸ÃÒì³£
* @throws ClassNotFoundException ÎÞ·¨ÕÒµ½Á¬½Ó³ØµÄÅäÖÃÖеÄÇý¶¯³ÌÐòÀà
* @throws IllegalAccessException Á¬½Ó³ØÅäÖÃÖеÄÇý¶¯³ÌÐòÀàÓÐÎó
* @throws InstantiationException ÎÞ·¨ÊµÀý»¯Çý¶¯³ÌÐòÀà
* @throws SQLException ÎÞ·¨Õý³£Á¬½ÓÖ¸¶¨µÄÊý¾Ý¿â
*/
public static DataSource rebind(String name, ConnectionParam param)
throws NameAlreadyBoundException,ClassNotFoundException,
IllegalAccessException,InstantiationException,SQLException
{
try{
unbind(name);
}catch(Exception e){}
return bind(name, param);
}
/**
* ɾ³ýÒ»¸öÊý¾Ý¿âÁ¬½Ó³Ø¶ÔÏó
* @param name
* @throws NameNotFoundException
*/
public static void unbind(String name) throws NameNotFoundException
{
DataSource dataSource = lookup(name);
if(dataSource instanceof DataSourceImpl){
DataSourceImpl dsi = (DataSourceImpl)dataSource;
try{
dsi.stop();
dsi.close();
}catch(Exception e){
}finally{
dsi = null;
}
}
connectionPools.remove(name);
}
}
|
ConnectionFactoryÖ÷ÒªÌṩÁËÓû§½«½«Á¬½Ó³Ø°ó¶¨µ½Ò»¸ö¾ßÌåµÄÃû³ÆÉÏÒÔ¼°È¡Ïû°ó¶¨µÄ²Ù×÷¡£Ê¹ÓÃÕßÖ»ÐèÒª¹ØÐÄÕâÁ½¸öÀ༴¿ÉʹÓÃÊý¾Ý¿âÁ¬½Ó³ØµÄ¹¦ÄÜ¡£ÏÂÃæÎÒÃǸø³öÒ»¶ÎÈçºÎʹÓÃÁ¬½Ó³ØµÄ´úÂ룺
String name = "pool";
String driver = " sun.jdbc.odbc.JdbcOdbcDriver ";
String url = "jdbc:odbc:datasource";
ConnectionParam param = new ConnectionParam(driver,url,null,null);
param.setMinConnection(1);
param.setMaxConnection(5);
param.setTimeoutValue(20000);
ConnectionFactory.bind(name, param);
System.out.println("bind datasource ok.");
//ÒÔÉÏ´úÂëÊÇÓÃÀ´µÇ¼ÇÒ»¸öÁ¬½Ó³Ø¶ÔÏ󣬸òÙ×÷¿ÉÒÔÔÚ³ÌÐò³õʼ»¯Ö»×öÒ»´Î¼´¿É
//ÒÔÏ¿ªÊ¼¾ÍÊÇʹÓÃÕßÕæÕýÐèҪдµÄ´úÂë
DataSource ds = ConnectionFactory.lookup(name);
try{
for(int i=0;i<10;i++){
Connection conn = ds.getConnection();
try{
testSQL(conn, sql);
}finally{
try{
conn.close();
}catch(Exception e){}
}
}
}catch(Exception e){
e.printStackTrace();
}finally{
ConnectionFactory.unbind(name);
System.out.println("unbind datasource ok.");
System.exit(0);
}
|
´ÓʹÓÃÕßµÄʾÀý´úÂë¾Í¿ÉÒÔ¿´³ö£¬ÎÒÃÇÒѾ½â¾öÁ˳£¹æÁ¬½Ó³Ø²úÉúµÄÁ½¸öÎÊÌâ¡£µ«ÊÇÎÒÃÇ×î×î¹ØÐĵÄÊÇÈçºÎ½â¾ö½Ó¹Üclose·½·¨µÄ°ì·¨¡£½Ó¹Ü¹¤×÷Ö÷ÒªÔÚConnectionFactoryÖеÄÁ½¾ä´úÂ룺
source = new DataSourceImpl(param);
source.initConnection();
|
DataSourceImplÊÇÒ»¸öʵÏÖÁ˽ӿÚjavax.sql.DataSourceµÄÀ࣬¸ÃÀàά»¤×ÅÒ»¸öÁ¬½Ó³ØµÄ¶ÔÏó¡£ÓÉÓÚ¸ÃÀàÊÇÒ»¸öÊܱ£»¤µÄÀ࣬Òò´ËËü±©Â¶¸øÊ¹ÓÃÕߵķ½·¨Ö»ÓнӿÚDataSourceÖж¨ÒåµÄ·½·¨£¬ÆäËûµÄËùÓз½·¨¶ÔʹÓÃÕßÀ´Ëµ¶¼ÊDz»¿ÉÊӵġ£ÎÒÃÇÏÈÀ´¹ØÐÄÓû§¿É·ÃÎʵÄÒ»¸ö·½·¨getConnection
/**
* @see javax.sql.DataSource#getConnection(String,String)
*/
public Connection getConnection(String user, String password) throws SQLException
{
//Ê×ÏÈ´ÓÁ¬½Ó³ØÖÐÕÒ³ö¿ÕÏеĶÔÏó
Connection conn = getFreeConnection(0);
if(conn == null){
//ÅжÏÊÇ·ñ³¬¹ý×î´óÁ¬½ÓÊý,Èç¹û³¬¹ý×î´óÁ¬½ÓÊý
//ÔòµÈ´ýÒ»¶¨Ê±¼ä²é¿´ÊÇ·ñÓпÕÏÐÁ¬½Ó,·ñÔòÅ׳öÒì³£¸æËßÓû§ÎÞ¿ÉÓÃÁ¬½Ó
if(getConnectionCount() >= connParam.getMaxConnection())
conn = getFreeConnection(connParam.getWaitTime());
else{//ûÓг¬¹ýÁ¬½ÓÊý£¬ÖØÐ»ñȡһ¸öÊý¾Ý¿âµÄÁ¬½Ó
connParam.setUser(user);
connParam.setPassword(password);
Connection conn2 = DriverManager.getConnection(connParam.getUrl(),
user, password);
//´úÀí½«Òª·µ»ØµÄÁ¬½Ó¶ÔÏó
_Connection _conn = new _Connection(conn2,true);
synchronized(conns){
conns.add(_conn);
}
conn = _conn.getConnection();
}
}
return conn;
}
/**
* ´ÓÁ¬½Ó³ØÖÐȡһ¸ö¿ÕÏеÄÁ¬½Ó
* @param nTimeout Èç¹û¸Ã²ÎÊýֵΪ0ÔòûÓÐÁ¬½ÓʱֻÊÇ·µ»ØÒ»¸önull
* ·ñÔòµÄ»°µÈ´ýnTimeoutºÁÃë¿´ÊÇ·ñ»¹ÓпÕÏÐÁ¬½Ó£¬Èç¹ûûÓÐÅ׳öÒì³£
* @return Connection
* @throws SQLException
*/
protected synchronized Connection getFreeConnection(long nTimeout)
throws SQLException
{
Connection conn = null;
Iterator iter = conns.iterator();
while(iter.hasNext()){
_Connection _conn = (_Connection)iter.next();
if(!_conn.isInUse()){
conn = _conn.getConnection();
_conn.setInUse(true);
break;
}
}
if(conn == null && nTimeout > 0){
//µÈ´ýnTimeoutºÁÃëÒԱ㿴ÊÇ·ñÓпÕÏÐÁ¬½Ó
try{
Thread.sleep(nTimeout);
}catch(Exception e){}
conn = getFreeConnection(0);
if(conn == null)
throw new SQLException("ûÓпÉÓõÄÊý¾Ý¿âÁ¬½Ó");
}
return conn;
}
|
DataSourceImplÀàÖÐʵÏÖgetConnection·½·¨µÄ¸úÕý³£µÄÊý¾Ý¿âÁ¬½Ó³ØµÄÂß¼ÊÇÒ»Öµģ¬Ê×ÏÈÅжÏÊÇ·ñÓпÕÏеÄÁ¬½Ó£¬Èç¹ûûÓеϰÅжÏÁ¬½ÓÊýÊÇ·ñÒѾ³¬¹ý×î´óÁ¬½ÓÊýµÈµÈµÄһЩÂß¼¡£µ«ÊÇÓÐÒ»µã²»Í¬µÄÊÇͨ¹ýDriverManagerµÃµ½µÄÊý¾Ý¿âÁ¬½Ó²¢²»ÊǼ°Ê±·µ»ØµÄ£¬¶øÊÇͨ¹ýÒ»¸ö½Ð_ConnectionµÄÀàÖнéһϣ¬È»ºóµ÷ÓÃ_Connection.getConnection·µ»ØµÄ¡£Èç¹ûÎÒÃÇûÓÐͨ¹ýÒ»¸öÖнéÒ²¾ÍÊÇJAVAÖеÄProxyÀ´½Ó¹ÜÒª·µ»ØµÄ½Ó¿Ú¶ÔÏó£¬ÄÇôÎÒÃǾÍûÓа취½Ø×¡Connection.close·½·¨¡£
ÖÕÓÚµ½Á˺ËÐÄËùÔÚ£¬ÎÒÃÇÏÈÀ´¿´¿´_ConnectionÊÇÈçºÎʵÏֵģ¬È»ºóÔÙ½éÉÜÊǿͻ§¶Ëµ÷ÓÃConnection.close·½·¨Ê±×ßµÄÊÇÔõÑùÒ»¸öÁ÷³Ì£¬ÎªÊ²Ã´²¢Ã»ÓÐÕæÕýµÄ¹Ø±ÕÁ¬½Ó¡£
/**
* Êý¾ÝÁ¬½ÓµÄ×Ô·â×°£¬ÆÁ±ÎÁËclose·½·¨
* @author Liudong
*/
class _Connection implements InvocationHandler
{
private final static String CLOSE_METHOD_NAME = "close";
private Connection conn = null;
//Êý¾Ý¿âµÄæ״̬
private boolean inUse = false;
//Óû§×îºóÒ»´Î·ÃÎʸÃÁ¬½Ó·½·¨µÄʱ¼ä
private long lastAccessTime = System.currentTimeMillis();
_Connection(Connection conn, boolean inUse){
this.conn = conn;
this.inUse = inUse;
}
/**
* Returns the conn.
* @return Connection
*/
public Connection getConnection() {
//·µ»ØÊý¾Ý¿âÁ¬½ÓconnµÄ½Ó¹ÜÀ࣬ÒÔ±ã½Ø×¡close·½·¨
Connection conn2 = (Connection)Proxy.newProxyInstance(
conn.getClass().getClassLoader(),
conn.getClass().getInterfaces(),this);
return conn2;
}
/**
* ¸Ã·½·¨ÕæÕýµÄ¹Ø±ÕÁËÊý¾Ý¿âµÄÁ¬½Ó
* @throws SQLException
*/
void close() throws SQLException{
//ÓÉÓÚÀàÊôÐÔconnÊÇûÓб»½Ó¹ÜµÄÁ¬½Ó£¬Òò´ËÒ»µ©µ÷ÓÃclose·½·¨ºó¾ÍÖ±½Ó¹Ø±ÕÁ¬½Ó
conn.close();
}
/**
* Returns the inUse.
* @return boolean
*/
public boolean isInUse() {
return inUse;
}
/**
* @see java.lang.reflect.InvocationHandler#invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object)
*/
public Object invoke(Object proxy, Method m, Object[] args)
throws Throwable
{
Object obj = null;
//ÅжÏÊÇ·ñµ÷ÓÃÁËcloseµÄ·½·¨£¬Èç¹ûµ÷ÓÃclose·½·¨Ôò°ÑÁ¬½ÓÖÃΪÎÞÓÃ״̬
if(CLOSE_METHOD_NAME.equals(m.getName()))
setInUse(false);
else
obj = m.invoke(conn, args);
//ÉèÖÃ×îºóÒ»´Î·ÃÎÊʱ¼ä£¬ÒԱ㼰ʱÇå³ý³¬Ê±µÄÁ¬½Ó
lastAccessTime = System.currentTimeMillis();
return obj;
}
/**
* Returns the lastAccessTime.
* @return long
*/
public long getLastAccessTime() {
return lastAccessTime;
}
/**
* Sets the inUse.
* @param inUse The inUse to set
*/
public void setInUse(boolean inUse) {
this.inUse = inUse;
}
}
|
Ò»µ©Ê¹ÓÃÕßµ÷ÓÃËùµÃµ½Á¬½ÓµÄclose·½·¨£¬ÓÉÓÚÓû§µÄÁ¬½Ó¶ÔÏóÊǾ¹ý½Ó¹ÜºóµÄ¶ÔÏó£¬Òò´ËJAVAÐéÄâ»ú»áÊ×Ïȵ÷ÓÃ_Connection.invoke·½·¨£¬Ôڸ÷½·¨ÖÐÊ×ÏÈÅжÏÊÇ·ñΪclose·½·¨£¬Èç¹û²»ÊÇÔò½«´úÂëת¸øÕæÕýµÄûÓб»½Ó¹ÜµÄÁ¬½Ó¶ÔÏóconn¡£·ñÔòµÄ»°Ö»ÊǼòµ¥µÄ½«¸ÃÁ¬½ÓµÄ״̬ÉèÖÃΪ¿ÉÓᣵ½´ËÄú¿ÉÄܾÍÃ÷°×ÁËÕû¸ö½Ó¹ÜµÄ¹ý³Ì£¬µ«ÊÇͬʱҲÓÐÒ»¸öÒÉÎÊ£ºÕâÑùµÄ»°ÊDz»ÊÇÕâЩÒѽ¨Á¢µÄÁ¬½Ó¾ÍʼÖÕûÓÐ°ì·¨ÕæÕý¹Ø±Õ£¿´ð°¸ÊÇ¿ÉÒԵġ£ÎÒÃÇÀ´¿´¿´ConnectionFactory.unbind·½·¨£¬¸Ã·½·¨Ê×ÏÈÕÒµ½Ãû×Ö¶ÔÓ¦µÄÁ¬½Ó³Ø¶ÔÏó£¬È»ºó¹Ø±Õ¸ÃÁ¬½Ó³ØÖеÄËùÓÐÁ¬½Ó²¢É¾³ýµôÁ¬½Ó³Ø¡£ÔÚDataSourceImplÀàÖж¨ÒåÁËÒ»¸öclose·½·¨ÓÃÀ´¹Ø±ÕËùÓеÄÁ¬½Ó£¬Ïêϸ´úÂëÈçÏ£º
/**
* ¹Ø±Õ¸ÃÁ¬½Ó³ØÖеÄËùÓÐÊý¾Ý¿âÁ¬½Ó
* @return int ·µ»Ø±»¹Ø±ÕÁ¬½ÓµÄ¸öÊý
* @throws SQLException
*/
public int close() throws SQLException
{
int cc = 0;
SQLException excp = null;
Iterator iter = conns.iterator();
while(iter.hasNext()){
try{
((_Connection)iter.next()).close();
cc ++;
}catch(Exception e){
if(e instanceof SQLException)
excp = (SQLException)e;
}
}
if(excp != null)
throw excp;
return cc;
}
|
¸Ã·½·¨Ò»Ò»µ÷ÓÃÁ¬½Ó³ØÖÐÿ¸ö¶ÔÏóµÄclose·½·¨£¬Õâ¸öclose·½·¨¶ÔÓ¦µÄÊÇ_ConnectionÖжÔcloseµÄʵÏÖ£¬ÔÚ_Connection¶¨ÒåÖйرÕÊý¾Ý¿âÁ¬½ÓµÄʱºòÊÇÖ±½Óµ÷ÓÃûÓо¹ý½Ó¹ÜµÄ¶ÔÏóµÄ¹Ø±Õ·½·¨£¬Òò´Ë¸Ãclose·½·¨ÕæÕýµÄÊÍ·ÅÁËÊý¾Ý¿â×ÊÔ´¡£
ÒÔÉÏÎÄ×ÖÖ»ÊÇÃèÊöÁ˽ӿڷ½·¨µÄ½Ó¹Ü£¬¾ßÌåÒ»¸öʵÓõÄÁ¬½Ó³ØÄ£¿é»¹ÐèÒª¶Ô¿ÕÏÐÁ¬½ÓµÄ¼à¿Ø²¢¼°Ê±ÊÍ·ÅÁ¬½Ó£¬ÏêϸµÄ´úÂëÇë²ÎÕÕ¸½¼þ¡£ 
|