package com.iailab.framework.tenant.core.context;

import com.alibaba.ttl.TransmittableThreadLocal;
import com.iailab.framework.common.enums.DocumentEnum;

/**
 * 数据源上下文 Holder
 *
 * @author iailab
 */
public class DataContextHolder {

    /**
     * 数据源id
     */
    private static final ThreadLocal<Long> DATA_SOURCE_ID =  new TransmittableThreadLocal<>();

    /**
     * 数据源id
     *
     * @return 租户编号
     */
    public static Long getDataSourceId() {
        return DATA_SOURCE_ID.get();
    }

    /**
     * 数据源id。如果不存在，则抛出 NullPointerException 异常
     *
     * @return 租户编号
     */
    public static Long getRequiredDataSourceId() {
        Long dataSourceId = getDataSourceId();
        if (dataSourceId == null) {
            throw new NullPointerException("DataContextHolder 不存在数据源id！可参考文档："
                + DocumentEnum.TENANT.getUrl());
        }
        return dataSourceId;
    }

    public static void setDataSourceId(Long dataSourceId) {
        DATA_SOURCE_ID.set(dataSourceId);
    }

}