common-pool2 学习：thrift连接池的另一种实现

package test.cn.mwee.service.paidui.pool;

import org.apache.commons.pool2.BasePooledObjectFactory;
import org.apache.commons.pool2.PooledObject;
import org.apache.commons.pool2.impl.DefaultPooledObject;
import org.apache.thrift.protocol.TCompactProtocol;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TFramedTransport;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;
import org.apache.thrift.transport.TTransportException;

public class TProtocolFactory
        extends BasePooledObjectFactory<TProtocol> {


    private String host;
    private int port;
    private boolean keepAlive = true;

    public TProtocolFactory(String host, int port, boolean keepAlive) {
        this.host = host;
        this.port = port;
        this.keepAlive = keepAlive;
    }

    @Override
    public TProtocol create() throws TTransportException {
        TSocket tSocket = new TSocket(host, port);
        TTransport tTransport = new TFramedTransport(tSocket);
        tTransport.open();
        return new TCompactProtocol(tTransport);
    }


    @Override
    public PooledObject<TProtocol> wrap(TProtocol protocol) {
        return new DefaultPooledObject<>(protocol);
    }

    /**
     * 对象钝化(即：从激活状态转入非激活状态，returnObject时触发）
     *
     * @param pooledObject
     * @throws TTransportException
     */
    @Override
    public void passivateObject(PooledObject<TProtocol> pooledObject) throws TTransportException {
        if (!keepAlive) {
            pooledObject.getObject().getTransport().flush();
            pooledObject.getObject().getTransport().close();
        }
    }


    /**
     * 对象激活(borrowObject时触发）
     *
     * @param pooledObject
     * @throws TTransportException
     */
    @Override
    public void activateObject(PooledObject<TProtocol> pooledObject) throws TTransportException {
        if (!pooledObject.getObject().getTransport().isOpen()) {
            pooledObject.getObject().getTransport().open();
        }
    }


    /**
     * 对象销毁(clear时会触发）
     * @param pooledObject
     * @throws TTransportException
     */
    @Override
    public void destroyObject(PooledObject<TProtocol> pooledObject) throws TTransportException {
        passivateObject(pooledObject);
        pooledObject.markAbandoned();
    }


    /**
     * 验证对象有效性
     *
     * @param p
     * @return
     */
    @Override
    public boolean validateObject(PooledObject<TProtocol> p) {
        if (p.getObject() != null) {
            if (p.getObject().getTransport().isOpen()) {
                return true;
            }
            try {
                p.getObject().getTransport().open();
                return true;
            } catch (TTransportException e) {
                e.printStackTrace();
            }
        }
        return false;
    }
}

package test.cn.mwee.service.paidui.pool;

import org.apache.commons.pool2.PooledObjectFactory;
import org.apache.commons.pool2.impl.GenericObjectPool;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;

/**
 * Created by yangjunming on 6/7/16.
 */
public class AutoClearGenericObjectPool<T> extends GenericObjectPool<T> {

    public AutoClearGenericObjectPool(PooledObjectFactory<T> factory) {
        super(factory);
    }

    public AutoClearGenericObjectPool(PooledObjectFactory<T> factory, GenericObjectPoolConfig config) {
        super(factory, config);
    }

    @Override
    public void returnObject(T obj) {
        super.returnObject(obj);
        //空闲数>=激活数时，清理掉空闲连接
        if (getNumIdle() >= getNumActive()) {
            clear();
        }
    }

}

package test.cn.mwee.service.paidui.pool;

import org.apache.commons.pool2.ObjectPool;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
import org.apache.thrift.protocol.TProtocol;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

/**
 * thrift 连接池测试
 */
public class ProtocolPoolTest {


    public static void main(String[] args) throws Exception {

        GenericObjectPoolConfig poolConfig = new GenericObjectPoolConfig();
        poolConfig.setMaxTotal(10);
        poolConfig.setMinIdle(1);
        poolConfig.setTestOnBorrow(true);

        ObjectPool<TProtocol> pool = new AutoClearGenericObjectPool<>(
                new TProtocolFactory("127.0.0.1", 13041, true), poolConfig);

        List<TProtocol> list = new ArrayList<>();
        for (int i = 1; i <= 10; i++) {
            TProtocol protocol = pool.borrowObject();
            System.out.println(protocol.toString());
            if (i % 2 == 0) {
                //10个连接中，将偶数归还
                pool.returnObject(protocol);
            } else {
                list.add(protocol);
            }
        }

        Random rnd = new Random();
        while (true) {
            System.out.println(String.format("active:%d,idea:%d", pool.getNumActive(), pool.getNumIdle()));
            Thread.sleep(5000);
            //每次还一个
            if (list.size() > 0) {
                int i = rnd.nextInt(list.size());
                pool.returnObject(list.get(i));
                list.remove(i);
            }

            //直到全部还完
            if (pool.getNumActive() <= 0) {
                break;
            }
        }

        System.out.println("------------------------");


        list.clear();
        //连接池为空，测试是否能重新创建新连接
        for (int i = 1; i <= 10; i++) {
            TProtocol protocol = pool.borrowObject();
            System.out.println(protocol.toString());
            if (i % 2 == 0) {
                pool.returnObject(protocol);
            } else {
                list.add(protocol);
            }
        }

        while (true) {
            System.out.println(String.format("active:%d,idea:%d", pool.getNumActive(), pool.getNumIdle()));
            Thread.sleep(5000);
            if (list.size() > 0) {
                int i = rnd.nextInt(list.size());
                pool.returnObject(list.get(i));
                list.remove(i);
            }

            if (pool.getNumActive() <= 0) {
                pool.close();
                break;
            }
        }

    }
}