JedisPool连接池实现难点

时间：2015-07-04 00:44:44 阅读：215 评论：0 收藏：0 [点我收藏+]

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【可改进的问题】

问题是jedispool有没有办法监控状态，比如说当前连接有多少，当前idle连接有多少，之类的同求。真心不想每次都构建连接然后在手动将连接返回池。

【JedisPool源码】

package redis.clients.jedis;
import org.apache.commons.pool.impl.GenericObjectPool.Config;
import redis.clients.util.Pool;
public class JedisPool extends Pool<Jedis>
{
public JedisPool(GenericObjectPool.Config poolConfig, String host)
{
this(poolConfig, host, 6379, 2000, null);
}
<strong> public JedisPool(String host, int port)
{
super(new GenericObjectPool.Config(), new JedisFactory(host, port, 2000, null));
}</strong>
<strong> public JedisPool(GenericObjectPool.Config poolConfig, String host, int port, int timeout, String password)
{
super(poolConfig, new JedisFactory(host, port, timeout, password));
}</strong>
public JedisPool(GenericObjectPool.Config poolConfig, String host, int port)
{
this(poolConfig, host, port, 2000, null);
}
public JedisPool(GenericObjectPool.Config poolConfig, String host, int port, int timeout)
{
this(poolConfig, host, port, timeout, null);
}
}

JedisPool继承了Pool，Pool的源码如下：

package redis.clients.util;
import org.apache.commons.pool.PoolableObjectFactory;
import org.apache.commons.pool.impl.GenericObjectPool;
import org.apache.commons.pool.impl.GenericObjectPool.Config;
import redis.clients.jedis.exceptions.JedisConnectionException;
import redis.clients.jedis.exceptions.JedisException;
public abstract class Pool<T>
{
private final GenericObjectPool internalPool;
public Pool(GenericObjectPool.Config poolConfig, PoolableObjectFactory factory)
{
this.internalPool = new GenericObjectPool(factory, poolConfig);
}
public T getResource()
{
try {
return this.internalPool.borrowObject();
} catch (Exception e) {
throw new JedisConnectionException("Could not get a resource from the pool", e);
}
}
public void returnResource(T resource)
{
try {
this.internalPool.returnObject(resource);
} catch (Exception e) {
throw new JedisException("Could not return the resource to the pool", e);
}
}
public void returnBrokenResource(T resource)
{
try {
this.internalPool.invalidateObject(resource);
} catch (Exception e) {
throw new JedisException("Could not return the resource to the pool", e);
}
}
public void destroy()
{
try {
this.internalPool.close();
} catch (Exception e) {
throw new JedisException("Could not destroy the pool", e);
}
}
}

至此我们已经清楚了，JedisPool使用了apache的GenericObjectPool来作为redis连接管理pool。GenericObjectPool的官方地址是：http://commons.apache.org/pool/

JedisFactory是PoolableObjectFactory的子类，PoolableObjectFactory提供了可以被Pool管理的对象的若干生命周期方法，JedisFactory的源码如下：

package redis.clients.jedis;
import org.apache.commons.pool.BasePoolableObjectFactory;
class JedisPool$JedisFactory extends BasePoolableObjectFactory
{
private final String host;
private final int port;
private final int timeout;
private final String password;
public JedisPool$JedisFactory(String host, int port, int timeout, String password)
{
this.host = host;
this.port = port;
this.timeout = ((timeout > 0) ? timeout : -1);
this.password = password;
}
public Object makeObject()
throws Exception
{
Jedis jedis;
if (this.timeout > 0)
jedis = new Jedis(this.host, this.port, this.timeout);
else {
jedis = new Jedis(this.host, this.port);
}
jedis.connect();
if (null != this.password) {
jedis.auth(this.password);
}
return jedis;
}
public void destroyObject(Object obj) throws Exception {
if (obj instanceof Jedis) {
Jedis jedis = (Jedis)obj;
if (!(jedis.isConnected())) return;
try {
try {
jedis.quit();
} catch (Exception e) {
}
jedis.disconnect();
}
catch (Exception e)
{
}
}
}
public boolean validateObject(Object obj) {
if (obj instanceof Jedis) {
Jedis jedis = (Jedis)obj;
try {
return ((jedis.isConnected()) && (jedis.ping().equals("PONG")));
} catch (Exception e) {
return false;
}
}
return false;
}
}

上面代码非常清楚地说明了JedisFactory如何构建、销毁、验证Jedis对象。这些生命周期方法会被GenericObjectPool 的borrowObject，returnObject，invalidateObject等方法调用。

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原文地址：http://www.cnblogs.com/lsx1993/p/4619948.html

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