大数据正式京淘13
2018-01-29 23:30
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大数据正式13
定时任务
防止恶意订单在订单提交之后,没有支付,但是订单没有生成效益,却减少了库存,如果大量生成这种订单,库存到0,无法继续购买
解决方案
虚拟商品数量:这个一直减,不是太好--适合紧急解决
引入定时任务,超时未支付订单自动回库,库存自动回退
电商:一天
解决技术
Timer的API
插件:石英钟
图解关系
使用
本身就是一个jar包
核心组件【Job,JobDetail具体处理,Scheduler调度器,Trigger触发器】
JobDetail+Job
继承自石英钟的父类,启动容器后,一旦加载JobDetail的实例,其中JobDetail下的多个job逻辑需要编写代码
调度器:负责调用一个JobDetail的的时间触发器
触发器:管理触发当前一个石英钟逻辑的JobDetail的组件,时间计算表达式,任何触发任务执行是由触发器计算管理的
简单解释
Job
表示一个工作,要执行的具体内容。
此接口中只有一个方法void execute(JobExecutionContext context)
JobDetail
JobDetail表示一个具体的可执行的调度程序,Job是这个可执行程调度程序所要执行的内容,另外JobDetail还包含了这个任务调度的方案和策略。
Trigger
代表一个调度参数的配置,什么时候去调。
Scheduler
代表一个调度容器,一个调度容器中可以注册多个JobDetail和Trigger。当Trigger与JobDetail组合,就可以被Scheduler容器调度了。
触发器的分类
简单触发器【Simple】
只能完成一些简单的circle时间逻辑,每隔一段时间,进行任务触发
复杂计算器【cron】
可以定在任意时间点进行事件的触发
Second:秒
Minute:分
Hour:时
Day-of-month:月中的天
Month:月
Day-of-work:周中的天
Year:年
石英钟使用过程
创建JobDetail实例
注册调度器
调度触发器
计算时间触发时间
触发任务代码
执行job代码
工作原理
scheduler是一个计划调度器容器(总部),容器里面可以盛放众多的JobDetail和trigger,当容器启动后,里面的每个JobDetail都会根据trigger按部就班自动去执行。
JobDetail是一个可执行的工作,它本身可能是有状态的。
Trigger代表一个调度参数的配置,什么时候去调。
当JobDetail和Trigger在scheduler容器上注册后,形成了装配好的作业(JobDetail和Trigger所组成的一对儿),就可以伴随容器启动而调度执行了。
scheduler是个容器,容器中有一个线程池,用来并行调度执行每个作业,这样可以提高容器效率。
内部结构
将石英钟添加到京淘
代码逻辑设置支付超时
判断是否超时:【当前的时间 - 创建的时间】结合【status的状态】
如果超时:归还库存
依赖
<!-- 石英钟任务 --> <dependency> <groupId>org.quartz-scheduler</groupId> <artifactId>quartz</artifactId> <version>2.2.1</version> </dependency>
配置文件:applicationContext-scheduler.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"> <!-- 定义任务bean --> <bean name="paymentOrderJobDetail" class="org.springframework.scheduling.quartz.JobDetailFactoryBean"> <!-- 指定具体的job类 --> <property name="jobClass" value="com.peng.job.PayMentOrderJob" /> <!-- 指定job的名称 --> <property name="name" value="paymentOrder" /> <!-- 指定job的分组 --> <property name="group" value="Order" /> <!-- 必须设置为true,如果为false,当没有活动的触发器与之关联时会在调度器中删除该任务 --> <property name="durability" value="true" /> <!-- 指定spring容器的key,如果不设定在job中的jobmap中是获取不到spring容器的 --> <property name="applicationContextJobDataKey" value="applicationContext" /> </bean> <!-- 定义触发器 --> <bean id="cronTrigger" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean"> <property name="jobDetail" ref="paymentOrderJobDetail" /> <!-- 每一天执行一次 --> <property name="cronExpression" value="0 0 0/23 * * ?" /> </bean> <!-- 定义调度器 --> <bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean"> <property name="triggers"> <list> <ref bean="cronTrigger" /> </list> </property> </bean> </beans>
java代码:PayMentOrderJob.java
package com.peng.job; import org.quartz.JobExecutionContext; import org.quartz.JobExecutionException; import org.springframework.context.ApplicationContext; import org.springframework.scheduling.quartz.QuartzJobBean; public class PayMentOrderJob extends QuartzJobBean { @Override protected void executeInternal(JobExecutionContext context) throws JobExecutionException { ApplicationContext applicationContrext = (ApplicationContext) context.getJobDetail().getJobDataMap() .get("applicationContext"); System.err.println("定时任务执行中~~"); } }
消息队列
RabbitMQ
引入当前京淘的架构性能提升点
NGINX高并发
Redis内存缓存数据库(非结构数据)
amoeba提升数据最后关卡的性能
超负荷的请求,以上三个技术无法处理
当请求来到时,如果并发量太大,就让请求排成队列
基于erlang语言
消息队列分类
simple简单队列【先后顺序】
work工作模式【资源竞争】--红包
publish/subscribe发布订阅【共享资源】:引入交换机--邮件的群发、群聊天、广播
路由模式:消息的生产者发送给交换机,通过路由判断key值发送到相应的队列--error通知
topic主题模式(路由模式的一种):通过表达式进行判断--*代表多个单词,#号代表一个单词
注意:别名
publish:fanout
routing:direct
topic:topic
使用
依赖<dependency> <groupId>com.rabbitmq</groupId> <artifactId>amqp-client</artifactId> <version>3.5.1</version> </dependency>
流程
创建连接工厂
从连接工厂获取connection
从连接获取channel
从channel获取绑定的queue
生产者生产消息放入队列
释放资源
RabbitMQ的工作原理
单发送,单接收使用场景:简单的发送与接收,没有设么特别的处理
示例【生产者】
public class Send { private final static String QUEUE_NAME = "hello";//队列的名称 public static void main(String[] argv) throws Exception { // 获取连接工厂 ConnectionFactory factory = new ConnectionFactory(); // 设置主机IP factory.setHost("localhost"); // 获取连接 Connection connection = factory.newConnection(); // 创建通道 Channel channel = connection.createChannel(); // 通道找到队列 channel.queueDeclare(QUEUE_NAME, false, false, false, null); String message = "Hello World!"; // 发送消息给队列 channel.basicPublish("", QUEUE_NAME, null, message.getBytes()); System.out.println(" [x] Sent '" + message + "'"); // 关闭连接 channel.close(); connection.close(); } }
示例【消费者】
public class Recv { // 队列名称 private final static String QUEUE_NAME = "hello"; public static void main(String[] argv) throws Exception { // 获得连接工厂 ConnectionFactory factory = new ConnectionFactory(); // 设置主机IP factory.setHost("localhost"); // 获得连接 Connection connection = factory.newConnection(); // 创建通道 Channel channel = connection.createChannel(); // 通道连接队列 channel.queueDeclare(QUEUE_NAME, false, false, false, null); System.out.println(" [*] Waiting for messages. To exit press CTRL+C"); // 接收队列 QueueingConsumer consumer = new QueueingConsumer(channel); // 执行 channel.basicConsume(QUEUE_NAME, true, consumer); // 遍历队列消息 while (true) { // 传送队列信息 QueueingConsumer.Delivery delivery = consumer.nextDelivery(); String message = new String(delivery.getBody()); System.out.println(" [x] Received '" + message + "'"); } } }
单发送多接收
使用场景:一个发送端,多个接收端,如分布式的任务派发。为了保证消息发送的可靠性,不丢失消息,使消息持久化了。同时为了防止接收端在处理消息时down掉,只有在消息处理完成后才发送ack消息。
示例【生产者】
public class NewTask { // 队列的名称 private static final String TASK_QUEUE_NAME = "task_queue"; public static void main(String[] argv) throws Exception { // 连接工厂 ConnectionFactory factory = new ConnectionFactory(); // 设置主机IP factory.setHost("localhost"); // 获取连接 Connection connection = factory.newConnection(); // 创建通道 Channel channel = connection.createChannel(); channel.queueDeclare(TASK_QUEUE_NAME, true, false, false, null); String message = getMessage(argv); // PERSISTENT_TEXT_PLAIN:消息的持久化 channel.basicPublish("", TASK_QUEUE_NAME, MessageProperties.PERSISTENT_TEXT_PLAIN, message.getBytes()); System.out.println(" [x] Sent '" + message + "'"); channel.close(); connection.close(); } private static String getMessage(String[] strings){ if (strings.length < 1) return "Hello World!"; return joinStrings(strings, " "); } private static String joinStrings(String[] strings, String delimiter) { int length = strings.length; if (length == 0) return ""; StringBuilder words = new StringBuilder(strings[0]); for (int i = 1; i < length; i++) { words.append(delimiter).append(strings[i]); } return words.toString(); } }
示例【消费者】
public class Worker { private static final String TASK_QUEUE_NAME = "task_queue"; public static void main(String[] argv) throws Exception { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("localhost"); Connection connection = factory.newConnection(); Channel channel = connection.createChannel(); channel.queueDeclare(TASK_QUEUE_NAME, true, false, false, null); System.out.println(" [*] Waiting for messages. To exit press CTRL+C"); // 使用了channel.basicQos(1)保证在接收端一个消息没有处理完时不会接收另一个消息,即接收端发送了ack后才会接收下一个消息。在这种情况下发送端会尝试把消息发送给下一个not busy的接收端 channel.basicQos(1); QueueingConsumer consumer = new QueueingConsumer(channel); channel.basicConsume(TASK_QUEUE_NAME, false, consumer); while (true) { QueueingConsumer.Delivery delivery = consumer.nextDelivery(); String message = new String(delivery.getBody()); System.out.println(" [x] Received '" + message + "'"); doWork(message); System.out.println(" [x] Done"); channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false); } } private static void doWork(String task) throws InterruptedException { for (char ch: task.toCharArray()) { if (ch == '.') Thread.sleep(1000); } } }
Publish/Subscribe
使用场景:发布、订阅模式,发送端发送广播消息,多个接收端接收
示例【生产者】
public class EmitLog { private static final String EXCHANGE_NAME = "logs"; public static void main(String[] argv) throws Exception { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("localhost"); Connection connection = factory.newConnection(); Channel channel = connection.createChannel(); channel.exchangeDeclare(EXCHANGE_NAME, "fanout"); String message = getMessage(argv); channel.basicPublish(EXCHANGE_NAME, "", null, message.getBytes()); System.out.println(" [x] Sent '" + message + "'"); channel.close(); connection.close(); } private static String getMessage(String[] strings){ if (strings.length < 1) return "info: Hello World!"; return joinStrings(strings, " "); } private static String joinStrings(String[] strings, String delimiter) { int length = strings.length; if (length == 0) return ""; StringBuilder words = new StringBuilder(strings[0]); for (int i = 1; i < length; i++) { words.append(delimiter).append(strings[i]); } return words.toString(); } }
示例【消费者】
public class ReceiveLogs { private static final String EXCHANGE_NAME = "logs"; public static void main(String[] argv) throws Exception { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("localhost"); Connection connection = factory.newConnection(); Channel channel = connection.createChannel(); channel.exchangeDeclare(EXCHANGE_NAME, "fanout"); String queueName = channel.queueDeclare().getQueue(); channel.queueBind(queueName, EXCHANGE_NAME, ""); System.out.println(" [*] Waiting for messages. To exit press CTRL+C"); QueueingConsumer consumer = new QueueingConsumer(channel); channel.basicConsume(queueName, true, consumer); while (true) { QueueingConsumer.Delivery delivery = consumer.nextDelivery(); String message = new String(delivery.getBody()); System.out.println(" [x] Received '" + message + "'"); } } }
Routing (按路线发送接收)
使用场景:发送端按routing key发送消息,不同的接收端按不同的routing key接收消息
示例【生产者】
public class EmitLogDirect { private static final String EXCHANGE_NAME = "direct_logs"; public static void main(String[] argv) throws Exception { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("localhost"); Connection connection = factory.newConnection(); Channel channel = connection.createChannel(); channel.exchangeDeclare(EXCHANGE_NAME, "direct"); String severity = getSeverity(argv); String message = getMessage(argv); channel.basicPublish(EXCHANGE_NAME, severity, null, message.getBytes()); System.out.println(" [x] Sent '" + severity + "':'" + message + "'"); channel.close(); connection.close(); } private static String getSeverity(String[] strings){ if (strings.length < 1) return "info"; return strings[0]; } private static String getMessage(String[] strings){ if (strings.length < 2) return "Hello World!"; return joinStrings(strings, " ", 1); } private static String joinStrings(String[] strings, String delimiter, int startIndex) { int length = strings.length; if (length == 0 ) return ""; if (length < startIndex ) return ""; StringBuilder words = new StringBuilder(strings[startIndex]); for (int i = startIndex + 1; i < length; i++) { words.append(delimiter).append(strings[i]); } return words.toString(); } }
示例【消费者】
public class ReceiveLogsDirect { private static final String EXCHANGE_NAME = "direct_logs"; public static void main(String[] argv) throws Exception { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("localhost"); Connection connection = factory.newConnection(); Channel channel = connection.createChannel(); channel.exchangeDeclare(EXCHANGE_NAME, "direct"); String queueName = channel.queueDeclare().getQueue(); if (argv.length < 1){ System.err.println("Usage: ReceiveLogsDirect [info] [warning] [error]"); System.exit(1); } for(String severity : argv){ channel.queueBind(queueName, EXCHANGE_NAME, severity); } System.out.println(" [*] Waiting for messages. To exit press CTRL+C"); QueueingConsumer consumer = new QueueingConsumer(channel); channel.basicConsume(queueName, true, consumer); while (true) { QueueingConsumer.Delivery delivery = consumer.nextDelivery(); String message = new String(delivery.getBody()); String routingKey = delivery.getEnvelope().getRoutingKey(); System.out.println(" [x] Received '" + routingKey + "':'" + message + "'"); } } }
Topics (按topic发送接收)
使用场景:发送端不只按固定的routing key发送消息,而是按字符串“匹配”发送,接收端同样如此。
示例【生产者】
public class EmitLogTopic { private static final String EXCHANGE_NAME = "topic_logs"; public static void main(String[] argv) { Connection connection = null; Channel channel = null; try { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("localhost"); connection = factory.newConnection(); channel = connection.createChannel(); channel.exchangeDeclare(EXCHANGE_NAME, "topic"); String routingKey = getRouting(argv); String message = getMessage(argv); channel.basicPublish(EXCHANGE_NAME, routingKey, null, message.getBytes()); System.out.println(" [x] Sent '" + routingKey + "':'" + message + "'"); } catch (Exception e) { e.printStackTrace(); } finally { if (connection != null) { try { connection.close(); } catch (Exception ignore) {} } } } private static String getRouting(String[] strings){ if (strings.length < 1) return "anonymous.info"; return strings[0]; } private static String getMessage(String[] strings){ if (strings.length < 2) return "Hello World!"; return joinStrings(strings, " ", 1); } private static String joinStrings(String[] strings, String delimiter, int startIndex) { int length = strings.length; if (length == 0 ) return ""; if (length < startIndex ) return ""; StringBuilder words = new StringBuilder(strings[startIndex]); for (int i = startIndex + 1; i < length; i++) { words.append(delimiter).append(strings[i]); } return words.toString(); } }
示例【消费者】
public class ReceiveLogsTopic { private static final String EXCHANGE_NAME = "topic_logs"; public static void main(String[] argv) { Connection connection = null; Channel channel = null; try { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("localhost"); connection = factory.newConnection(); channel = connection.createChannel(); channel.exchangeDeclare(EXCHANGE_NAME, "topic"); String queueName = channel.queueDeclare().getQueue(); if (argv.length < 1){ System.err.println("Usage: ReceiveLogsTopic [binding_key]..."); System.exit(1); } for(String bindingKey : argv){ channel.queueBind(queueName, EXCHANGE_NAME, bindingKey); } System.out.println(" [*] Waiting for messages. To exit press CTRL+C"); QueueingConsumer consumer = new QueueingConsumer(channel); channel.basicConsume(queueName, true, consumer); while (true) { QueueingConsumer.Delivery delivery = consumer.nextDelivery(); String message = new String(delivery.getBody()); String routingKey = delivery.getEnvelope().getRoutingKey(); System.out.println(" [x] Received '" + routingKey + "':'" + message + "'"); } } catch (Exception e) { e.printStackTrace(); } finally { if (connection != null) { try { connection.close(); } catch (Exception ignore) {} } } } }
秒杀
业务场景分析
并发量很高的时间段--抢商品队列中的消息可以是什么
电话号码
username
ticket
......
做法
调用SSO查询用户信息,把前n个消息获取到,后面的放入rabbitmq的垃圾桶
更高的并发可以考虑分布式的队列
文件位置
生产者:后台
消费者:前台
秒杀设计
未完待续。。。
注:参考文章
RabbitMQ的几种典型使用场景:https://www.rabbitmq.com/getstarted.html相关文章推荐
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