java用apache.commons.pool2实现一个连接池来管理netty的客户端长连接

 

一、apache.commons.pool2介绍

Apache Commons Pool库提供了一整套用于实现对象池化的API，以及若干种各具特色的对象池实现。2.0版本，并非是对1.x的简单升级，而是一个完全重写的对象池的实现，显著的提升了性能和可伸缩性，并且包含可靠的实例跟踪和池监控。具体来讲就是个对象池的框架。

二、连接池实现

1.maven 引用

    <!-- https://mvnrepository.com/artifact/io.netty/netty-all -->
    <dependency>
        <groupId>io.netty</groupId>
        <artifactId>netty-all</artifactId>
        <version>4.1.42.Final</version>
    </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-pool2 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
            <version>2.8.0</version>
        </dependency>

2.先创建一个pool的基类

Pool.java

import org.apache.commons.pool2.PooledObjectFactory;
import org.apache.commons.pool2.impl.GenericObjectPool;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
import java.io.Closeable;

/**
 * 资源池基类，封装GenericObjectPool中相应的方法
 * @param <T>
 */
public abstract class Pool<T> implements Closeable {

  protected GenericObjectPool<T> internalPool;

  public Pool() {
  }

  public Pool(final GenericObjectPoolConfig poolConfig, PooledObjectFactory<T> factory) {
    initPool(poolConfig, factory);
  }

  @Override
  public void close() {
    destroy();
  }

  public boolean isClosed() {
    return this.internalPool.isClosed();
  }

  public void initPool(final GenericObjectPoolConfig poolConfig, PooledObjectFactory<T> factory) {

    if (this.internalPool != null) {
      try {
        closeInternalPool();
      } catch (Exception e) {
      }
    }

    this.internalPool = new GenericObjectPool<T>(factory, poolConfig);
  }

  /**
   * 获取一个对象资源
   * @return
   */
  public T getResource() {