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http://www.sohu.com/a/131128039_505813

电商后台设计

本文包括以下几个部分：
电商后台系统概述
电商后台产品设计：商品中心
电商后台产品设计：订单拆单
电商后台产品设计：促销活动解析
电商后台产品设计：优惠券的设计和妙用

two8g

/**
 * It lookup the correct datasource to use, we have one per tenant
 * 
 * The tenant datasource has default properties from database.properties and
 * also properties in database.{tenantId}.properties whose properties override
 * the default ones.
 * 
 * @author jose.mgmaestre
 *
 */

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/**
 * It specify what Tenant should be use when the hibernate session is created.
 * @author jm
 */
public class CurrentTenantIdentifierResolverImpl implements CurrentTenantIdentifierResolver {

	Logger logger = Logger.getLogger(getClass());
		
	@Override

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/**
 * It gets the connection based on different datasources. 
 */
public class MultiTenantConnectionProviderImpl extends AbstractDataSourceBasedMultiTenantConnectionProviderImpl
{
	
	Log logger = LogFactory.getLog(getClass());	

	private static final long serialVersionUID = 14535345L;
	

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version: "2"

services:
  zookeeper:
    image: confluentinc/cp-zookeeper:4.1.0
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
    ports:
    - 2181:2181
    logging:

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[{"sap": {
    "latest": {
      "type": "INTERPRETER",
      "name": "sap",
      "version": "0.8.0",
      "published": "2018-06-24T01:29:37+00:00",
      "artifact": "sap@0.8.0",
      "description": "Zeppelin SAP support",
      "license": "Apache-2.0",
      "icon": "<i class=\"fa fa-rocket\"></i>",

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import org.apache.spark.ml.Pipeline
import org.apache.spark.ml.evaluation.BinaryClassificationEvaluator
import org.apache.spark.ml.feature.MinMaxScaler
import org.apache.spark.ml.tuning.{CrossValidator, ParamGridBuilder}
import org.apache.spark.sql.functions._
import org.apache.spark.sql.types.{IntegerType, LongType}
import org.apache.spark.sql.SaveMode
import org.apache.spark.ml.classification.LogisticRegression
import org.apache.spark.ml.feature.VectorAssembler