java-classic-code/spring-mutil-datasource/config/DynamicContextHolder.java

/**
 * Copyright (c) 2018 yiidata.com All rights reserved.
 *
 * http://yiidata.com
 *
 *
 */

package com.yiidata.intergration.web.datasource.config;

import java.util.ArrayDeque;
import java.util.Deque;

/**
 * 多数据源上下文
 *
 * @author zhenqin
 */
public class DynamicContextHolder {
    @SuppressWarnings("unchecked")
    private static final ThreadLocal<Deque<String>> CONTEXT_HOLDER = new ThreadLocal() {
        @Override
        protected Object initialValue() {
            return new ArrayDeque();
        }
    };

    /**
     * 获得当前线程数据源
     *
     * @return 数据源名称
     */
    public static String peek() {
        return CONTEXT_HOLDER.get().peek();
    }

    /**
     * 设置当前线程数据源
     *
     * @param dataSource 数据源名称
     */
    public static void push(String dataSource) {
        CONTEXT_HOLDER.get().push(dataSource);
    }

    /**
     * 清空当前线程数据源
     */
    public static void poll() {
        Deque<String> deque = CONTEXT_HOLDER.get();
        deque.poll();
        if (deque.isEmpty()) {
            CONTEXT_HOLDER.remove();
        }
    }

}