最代码网站中关于动态表event的设计思路

原文：最代码网站中关于动态表event的设计思路 为了能将最代码整站用户的操作都展现出来，需要设计一种动态类型，既可以根据业务无限扩展，也可以指定某些用户行为是可以产生多少牛币交换的，这样就在原先javaniu的零散的表设计基础上抽象出event表 表结构如

原文：最代码网站中关于动态表event的设计思路

为了能将最代码整站用户的操作都展现出来，需要设计一种动态类型，既可以根据业务无限扩展，也可以指定某些用户行为是可以产生多少牛币交换的，这样就在原先javaniu的零散的表设计基础上抽象出event表

表结构如下：

CREATE TABLE `javaniu_event` (
  `id` bigint(20) unsigned NOT NULL auto_increment,
  `create_time` datetime NOT NULL,
  `update_time` datetime default NULL,
  `event_rule_id` bigint(20) NOT NULL default '0' COMMENT '用户注册\r\n下载代码\r\n浏览分享\r\n浏览寻求\r\n收藏分享\r\n收藏寻求\r\n浏览活动\r\n追加悬赏\r\n加入活动\r\n拜师\r\n关注用户\r\n发表心情\r\n发表寻求\r\n评论寻求\r\n评论代码\r\n上传代码\r\n下载代码\r\n分享代码\r\n关注用户\r\n浏览分享\r\n浏览寻求\r\n管理员删除代码\r\n收藏分享\r\n收藏寻求\r\n获取勋章\r\n拜师傅\r\n发起活动\r\n浏览活动\r\n加入活动\r\n追加悬赏\r\n连续一周发表心情\r\n用户周贡献排行\r\n用户月贡献排行\r\n用户年贡献排行\r\n代码下载周排行\r\n代码下载月排行\r\n代码下载年排行',
  `user_id` bigint(20) NOT NULL default '0',
  `source_user_id` bigint(20) NOT NULL default '0',
  `source_id` bigint(20) NOT NULL default '0',
  `target_id` bigint(20) NOT NULL default '0',
  `status` int(2) NOT NULL default '0' COMMENT '-1删除0待审核2正常',
  `type` int(2) NOT NULL default '0',
  PRIMARY KEY  (`id`),
  KEY `create_time` (`create_time`),
  KEY `userid_status` (`user_id`,`status`),
  KEY `event_rule_id_source_id` (`event_rule_id`,`source_id`),
  KEY `event_rule_id_status` (`event_rule_id`,`status`),
  KEY `type_source_id` (`type`,`source_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

关联表event_rule可以指定牛币规则及其动态显示信息，结构如下：

CREATE TABLE `javaniu_event_rule` (
  `id` bigint(20) unsigned NOT NULL auto_increment,
  `create_time` datetime NOT NULL,
  `update_time` datetime default NULL,
  `type` int(1) NOT NULL COMMENT '注册+1\r\n发表心情+1\r\n连续一周发表心情+5\r\n分享代码+1\r\n分享代码被下载+n(n为分享者者自定义牛币)\r\n寻求代码-2\r\n上传代码+1\r\n上传代码被下载+1\r\n代码被设为最佳+n(n为寻求者者自定义牛币)\r\n删除代码-1\r\n无效寻求-2\r\n无效代码-2\r\n管理员奖赏+n\r\n管理员惩罚-n\r\n周top10+5\r\n月top10+10\r\n年top10+100\r\n信息完善+1\r\n包月vip+100\r\n师傅赠送+n牛币\r\n授予徽章+5牛币\r\n',
  `name` varchar(100) NOT NULL,
  `niubi` int(11) NOT NULL,
  `extend_json` varchar(1000) NOT NULL,
  PRIMARY KEY  (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

event的用户行为数据模型抽象如下：

模型一：用户a通过事件x产生动态0=user_id_a 0 0 0
a=>x=>0
模型二：用户a通过事件x产生产生用户a的数据1=user_id_a 0 0 1
a=>x=>1
模型三：用户a通过事件x对用户b的数据1产生用户a的数据2=user_id_a b 1 2
a=>x+b+1=>2
模型四：用户a通过事件x对用户b的数据1产生动态0=user_id_a b 1 0
a=>x+b+1=>0
模型五：用户a通过事件x对用户b产生动态0=user_id_a b 0 0
a=>x+b=>0

排列组合:
user_id source_user_id source_id target_id
user_id
user_id source_user_id
user_id source_user_id source_id
user_id source_user_id source_id target_id

这样就囊括了所有会出现的用户event，只要在java层做业务转换即可：

最核心的event数据转换java类源码：

package com.zuidaima.core.service.impl;

	private void setSourceAndTarget(Event event, EventRule _eventRule) {
		try {
			EventRule eventRule = new EventRule();
			eventRule.setCreateTime(_eventRule.getCreateTime());
			eventRule.setExtendJson(_eventRule.getExtendJson());
			eventRule.setId(_eventRule.getId());
			eventRule.setName(_eventRule.getName());
			eventRule.setNiubi(_eventRule.getNiubi());
			eventRule.setType(_eventRule.getType());
			eventRule.setUpdateTime(_eventRule.getUpdateTime());
			BaseEntity source = null;
			BaseEntity target = null;
			long sourceId = event.getSourceId();
			long targetId = event.getTargetId();
			JSONObject extend = eventRule.getExtend();
			extend = eventRule.getExtend();
			String description = (String) extend.get("description");
			String _description = null;
			Answer answer = null;
			Project project = null;
			switch (eventRule.getType()) {
			case ModuleConstants.EVENT_TYPE_RULE_PROJECT_CREATE:
			case ModuleConstants.EVENT_TYPE_RULE_PROJECT_DELETE_BY_USER:
			case ModuleConstants.EVENT_TYPE_RULE_PROJECT_DELETE_BY_ADMIN:
			case ModuleConstants.EVENT_TYPE_RULE_PROJECT_VIEW:
			case ModuleConstants.EVENT_TYPE_RULE_PROJECT_COLLECT:
			case ModuleConstants.EVENT_TYPE_RULE_PROJECT_REWARD:
				if (sourceId > 0) {
					source = projectService.findOneById(sourceId);
				}
				if (targetId > 0) {
					target = projectService.findOneById(targetId);
				}
				project = (Project) target;
				if (source != null) {
					project = (Project) source;
				}
				if (project == null) {
					return;
				}
				_description = String.format(
						description,
						ModuleConstants.PROJECT_TYPE_DESC_MAP.get(
								project.getType()).getDesc());
				break;
			case ModuleConstants.EVENT_TYPE_RULE_POST_CREATE:
			case ModuleConstants.EVENT_TYPE_RULE_POST_DELETE_BY_USER:
			case ModuleConstants.EVENT_TYPE_RULE_POST_DELETE_BY_ADMIN:
				if (sourceId > 0) {
					source = postService.findOneById(sourceId);
				}
				if (targetId > 0) {
					target = postService.findOneById(targetId);
				}
				Post post = (Post) target;
				if (source != null) {
					post = (Post) source;
				}
				_description = String.format(description,
						ModuleConstants.POST_TYPE_DESC_MAP.get(post.getType()));
				break;
			// case ModuleConstants.EVENT_TYPE_RULE_GROUP_CREATE://暂时没有这种动态
			case ModuleConstants.EVENT_TYPE_RULE_GROUP_JOIN_IN:
			case ModuleConstants.EVENT_TYPE_RULE_GROUP_DELETE_BY_USER:
				// case
				// ModuleConstants.EVENT_TYPE_RULE_GROUP_DELETE_BY_ADMIN://暂时没有这种动态
				if (sourceId > 0) {
					source = groupService.findOneById(sourceId);
				}
				if (targetId > 0) {
					target = groupService.findOneById(targetId);
				}
				Group group = (Group) source;

				_description = String
						.format(description,
								ModuleConstants.GROUP_TYPE_DESC_MAP.get(group
										.getType()));
				break;
			case ModuleConstants.EVENT_TYPE_RULE_COMMENT_CREATE:
			case ModuleConstants.EVENT_TYPE_RULE_COMMENT_DELETE_BY_USER:
			case ModuleConstants.EVENT_TYPE_RULE_COMMENT_DELETE_BY_ADMIN:
				target = commentService.findOneById(targetId);
				Comment comment = (Comment) target;
				int commentType = comment.getType();
				if (commentType == ModuleConstants.COMMENT_TYPE_ANSWER) {
					source = answerService.findOneById(sourceId);
					answer = (Answer) source;
					project = (Project) answer.getTarget();
					_description = String.format(
							description,
							ModuleConstants.PROJECT_TYPE_DESC_MAP.get(
									project.getType()).getDesc());
				} else if (commentType == ModuleConstants.COMMENT_TYPE_PROJECT) {
					source = projectService.findOneById(sourceId);
					project = (Project) source;
					_description = String.format(
							description,
							ModuleConstants.PROJECT_TYPE_DESC_MAP.get(
									project.getType()).getDesc());
				} else if (commentType == ModuleConstants.COMMENT_TYPE_POST) {
					source = postService.findOneById(sourceId);
					post = (Post) source;
					_description = String.format(description,
							ModuleConstants.POST_TYPE_DESC_MAP.get(post
									.getType()));
				} else {

				}
				break;
			case ModuleConstants.EVENT_TYPE_RULE_ANSWER_CREATE:
			case ModuleConstants.EVENT_TYPE_RULE_ANSWER_BEEN_SET_PERFECT:
				source = projectService.findOneById(sourceId);
				target = answerService.findOneById(targetId);
				project = (Project) source;
				_description = String.format(
						description,
						ModuleConstants.PROJECT_TYPE_DESC_MAP.get(
								project.getType()).getDesc());
				break;
			case ModuleConstants.EVENT_TYPE_RULE_ANSWER_GET:
			case ModuleConstants.EVENT_TYPE_RULE_ANSWER_DELETE_BY_USER:
			case ModuleConstants.EVENT_TYPE_RULE_ANSWER_DELETE_BY_ADMIN:
				source = answerService.findOneById(sourceId);
				answer = (Answer) source;
				Project _project = (Project) answer.getTarget();
				_description = String.format(
						description,
						ModuleConstants.PROJECT_TYPE_DESC_MAP.get(
								_project.getType()).getDesc());
				break;
			case ModuleConstants.EVENT_TYPE_RULE_REPUTATION_CREATE:
				if (sourceId > 0) {
					source = reputationService.findOneById(sourceId);
				}
				if (targetId > 0) {
					target = reputationService.findOneById(targetId);
				}
				break;
			case ModuleConstants.EVENT_TYPE_RULE_USER_FOLLOW:
				source = userService.findOneById(sourceId);
				User _user = (User) source;
				_description = String
						.format(description,
								"<a href='/user/n/" &#43; _user.getName()
										&#43; ".htm'>" &#43; _user.getName() &#43; "</a>");
				break;
			case ModuleConstants.EVENT_TYPE_RULE_MENTION_COMMENT:
				target = commentService.findOneById(targetId);
				comment = (Comment) target;
				commentType = comment.getType();
				if (commentType == ModuleConstants.COMMENT_TYPE_ANSWER) {
					source = answerService.findOneById(sourceId);
					answer = (Answer) source;
					project = (Project) answer.getTarget();
					_description = String.format(
							description,
							ModuleConstants.PROJECT_TYPE_DESC_MAP.get(
									project.getType()).getDesc());
				} else if (commentType == ModuleConstants.COMMENT_TYPE_PROJECT) {
					source = projectService.findOneById(sourceId);
					project = (Project) source;
					_description = String.format(
							description,
							ModuleConstants.PROJECT_TYPE_DESC_MAP.get(
									project.getType()).getDesc());
				} else if (commentType == ModuleConstants.COMMENT_TYPE_POST) {
					source = postService.findOneById(sourceId);
					post = (Post) source;
					_description = String.format(description,
							ModuleConstants.POST_TYPE_DESC_MAP.get(post
									.getType()));
				} else {

				}
				break;
			case ModuleConstants.EVENT_TYPE_RULE_MENTION_POST:
				source = postService.findOneById(sourceId);
				break;
			default:
				_description = description;
			}

			extend.put("description", _description);
			eventRule.setExtend(extend);
			eventRule.setExtendJson(extend.toString());
			event.setEventRule(eventRule);

			event.setSource(source);
			event.setTarget(target);
		} catch (Exception e) {
			logger.error("Fail to setSourceAndTarget event:" &#43; event);
		}
	}

freemarker显示层转换核心代码：

<#switch event.eventRule.type>
				<#case event_type_rule_post_create>
					<@event_post_macro event.target/>
					<#break>
				<#case event_type_rule_project_create>
					<@event_project_macro event event.target/>
					<#break>
				<#case event_type_rule_project_view>
				<#case event_type_rule_project_collect>
				<#case event_type_rule_project_reward>
					<@event_project_macro event event.source/>
					<#break>
				<#case event_type_rule_comment_create>
					<@event_comment_macro event event.target/>
					<#break>
				<#case event_type_rule_answer_create>
					<@event_answer_macro event event.target/>
					<#break>
				<#case event_type_rule_answer_get>
				<#case event_type_rule_answer_been_set_perfect>
					<@event_answer_macro event event.source/>
					<#break>
				<#case event_type_rule_mention_comment>
					<@event_comment_macro event event.target/>
					<#break>
				<#case event_type_rule_mention_post>
					<@event_post_macro event.source/>
					<#break>
				</#switch>

比如其中一种event type的freemarker macro代码如下：

<!--event post-->
<#macro event_post_macro post>
	<div class="content margin_top5">
		${post.contentExt}
		<span class="comments_count">
			<a target="_blank" href="/mood/${post.id}/comment.htm" rel="nofollow"><img src="/static/imghwm/default1.png"  data-src="/resource/img/comment.gif"  class="lazy"  alt="${post.thirdSort}个评论">  ${post.thirdSort}</a>
		</span>
	</div>
</#macro>

这样的设计符合高内聚低耦合的设计思路，未来可以根据业务实现无限扩张，当然代价就是event表越来越大，但可以通过分库分表来分担压力，大家可以参考下，有好的意见可以留言。