126 lines
3.4 KiB
Java
126 lines
3.4 KiB
Java
package com.sunyard.pool;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ScheduledExecutorService;
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import java.util.concurrent.TimeUnit;
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public class ThreadBasedConnectPool<T> {
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// ThreadLocal
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private final Map<Thread, ObjectInPool<T>> map = new HashMap<Thread, ObjectInPool<T>>();
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// 守护
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private final ScheduledExecutorService threadPool = Executors.newScheduledThreadPool(1);
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// 配置
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private PoolConfig config;
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public ThreadBasedConnectPool(final PoolConfig config) {
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this.config = config;
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threadPool.scheduleAtFixedRate(new Runnable() {
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@Override
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public void run() {
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// 检测和回收逻辑
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Iterator<Map.Entry<Thread, ObjectInPool<T>>> it = map.entrySet().iterator();
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while (it.hasNext()) {
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Map.Entry<Thread, ObjectInPool<T>> entry = it.next();
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ObjectInPool<T> oip = entry.getValue();
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if (System.currentTimeMillis() - oip.getLasUseAt() < config.getMaxIdle()) {
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// 空闲时间不足，免检。
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continue;
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}
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if (System.currentTimeMillis() - oip.getLasUseAt() > config.getMaxUseless()) {
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// 长时间未使用，回收链接
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it.remove();
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try {
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free(oip.getObject());
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} catch (Exception e) {
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}
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continue;
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}
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boolean checkPass = false;
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try {
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checkPass = check(entry.getValue().getObjectForCheck());
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} catch (Exception e) {
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checkPass = false;
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}
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finally {
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}
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if ( ! checkPass) {
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// 检查未通过
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it.remove();
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try {
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free(oip.getObject());
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} catch (Exception e) {
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}
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continue;
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}
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}
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}
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}, config.getMaxIdle(), config.getMaxIdle(), TimeUnit.MILLISECONDS);
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}
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public ThreadBasedConnectPool() {
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this(new PoolConfig());
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}
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// 继承 初始化
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protected T initialValue() {
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return null;
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}
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// 保活接口
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protected boolean check(T o) {
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return null != o;
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}
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// 释放
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protected void free(T o) {
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}
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// 获取
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public T get() {
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ObjectInPool<T> o = map.get(Thread.currentThread());
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if (null != o) {
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return o.getObject();
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}
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return setInitialValue();
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}
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// 设置
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public void set(T o) {
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map.put(Thread.currentThread(), new ObjectInPool<T>(o));
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}
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// 清除
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public void remove() {
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map.remove(Thread.currentThread());
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}
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protected void afterInit(ObjectInPool oip, T value ){
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}
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private T setInitialValue() {
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T value = initialValue();
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ObjectInPool opi = new ObjectInPool<T>(value);
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map.put(Thread.currentThread(), opi);
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afterInit( opi , value);
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return value;
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}
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}
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