spring cache example
This commit is contained in:
sxyx2008
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package org.spring.cache.example;
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import java.io.Serializable;
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@SuppressWarnings("serial")
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public class Employee implements Serializable{
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private int id;
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private String empname;
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private int age;
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private String phone;
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public Employee() {
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}
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public Employee(int id, String empname, int age, String phone) {
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super();
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this.id = id;
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this.empname = empname;
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this.age = age;
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this.phone = phone;
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}
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public Employee(String empname) {
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super();
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this.empname = empname;
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}
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public String getEmpname() {
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return empname;
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}
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public void setEmpname(String empname) {
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this.empname = empname;
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}
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public int getAge() {
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return age;
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}
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public void setAge(int age) {
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this.age = age;
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}
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public String getPhone() {
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return phone;
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}
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public void setPhone(String phone) {
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this.phone = phone;
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}
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@Override
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public String toString() {
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return "Employee [id=" + id + ", empname=" + empname + ", age=" + age
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+ ", phone=" + phone + "]";
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}
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}
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+90
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package org.spring.cache.example;
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import java.util.ArrayList;
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import java.util.List;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.cache.annotation.CacheEvict;
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import org.springframework.cache.annotation.CachePut;
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import org.springframework.cache.annotation.Cacheable;
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import org.springframework.stereotype.Service;
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@Service
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public class EmployeeService {
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Logger logger = LoggerFactory.getLogger(getClass());
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/**
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* @Cacheable：负责将方法的返回值加入到缓存中
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*
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* @CacheEvict：负责清除缓存
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*
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* @Cacheable 支持如下几个参数：
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*
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* value：缓存位置名称，不能为空，如果使用EHCache，就是ehcache.xml中声明的cache的name
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*
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* key：缓存的key，默认为空，既表示使用方法的参数类型及参数值作为key，支持SpEL
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*
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* condition：触发条件，只有满足条件的情况才会加入缓存，默认为空，既表示全部都加入缓存，支持SpEL
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*
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* @CacheEvict 支持如下几个参数：
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*
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* value：缓存位置名称，不能为空，同上
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*
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* key：缓存的key，默认为空，同上
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*
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* condition：触发条件，只有满足条件的情况才会清除缓存，默认为空，支持SpEL
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*
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* allEntries：true表示清除value中的全部缓存，默认为false
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*/
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@Cacheable(value = "employeeCache"/*,condition="#empname.length() <= 4"*/)
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// 使用了一个缓存名叫 employeeCache
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public Employee getEmployeeByName(String empname) {
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// 方法内部实现不考虑缓存逻辑，直接实现业务
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return getFromDB(empname);
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}
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@Cacheable(value = "employeeCache", key = "#id")
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// 使用了一个缓存名为employeeCache的缓存
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public String getEmployee(Integer id) {
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logger.info("get employee called " + id);
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return "getEmployee" + id;
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}
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@Cacheable(value = "employeeCache", key = "#id", condition = "#id <= 10")
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// 使用了一个缓存名为employeeCache的缓存,缓存id小于等于10
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public String findEmployee(Integer id) {
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logger.info("get employee called");
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return "findEmployee" + id;
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}
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@CacheEvict(value = "employeeCache", allEntries = true)
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public List<Employee> listEmployee() {
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List<Employee> emps = new ArrayList<Employee>();
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return emps;
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}
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@CachePut(value = "employeeCache", key = "#employee.getEmpname()")
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// 清空 employeeCache 缓存
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public void updateEmployee(Employee employee) {
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updateDB(employee);
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}
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@CacheEvict(value = "employeeCache", allEntries = true)
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// 清空 employeeCache 缓存
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public void reload() {
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}
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private Employee getFromDB(String empname) {
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System.out.println("real querying db..." + empname);
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return new Employee(empname);
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}
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private void updateDB(Employee employee) {
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System.out.println("real update db..." + employee.getEmpname());
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}
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}
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+22
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package org.spring.cache.example;
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import java.util.HashMap;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Controller;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RequestParam;
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@Controller
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public class WebController {
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@Autowired
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EmployeeService employeeService;
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@RequestMapping("/index.htm")
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public String homePage(@RequestParam(required = false) Integer id,
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HashMap<String, String> map) {
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map.put("message", employeeService.getEmployee(id));
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return "index";
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}
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<ehcache>
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<diskStore path="java.io.tmpdir" />
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<cache name="employeeCache" maxElementsInMemory="10000" eternal="false"
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timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true"
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maxElementsOnDisk="10000000" diskPersistent="false"
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diskExpiryThreadIntervalSeconds="120" memoryStoreEvictionPolicy="LRU" />
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</ehcache>
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE log4j:configuration PUBLIC "-//LOGGER"
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"http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/xml/doc-files/log4j.dtd">
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<log4j:configuration>
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<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
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<!--<param name="Threshold" value="WARN"/>-->
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<layout class="org.apache.log4j.PatternLayout">
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<param name="ConversionPattern" value="%-5p %d{ISO8601} [%C.%M - %t] [%x] - %m%n"/>
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</layout>
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</appender>
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<appender name="LOGFILE" class="org.apache.log4j.RollingFileAppender">
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<!-- <param name="Threshold" value="INFO" /> -->
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<!-- <param name="Append" value="false" /> -->
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<param name="MaxBackupIndex" value="5"/>
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<param name="MaxFileSize" value="10MB"/>
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<param name="File" value="target/log4j.log"/>
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<layout class="org.apache.log4j.PatternLayout">
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<!-- <param name="ConversionPattern" value="%-4r [%C.%M - %t] %-5p [%x] - %m%n" /> -->
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<param name="ConversionPattern" value="%-5p %d [%t] %c: %m%n"/>
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</layout>
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</appender>
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<logger name="org.spring.cache.example">
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<level value="DEBUG"/>
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</logger>
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<logger name="org.springframework.web.accept">
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<level value="WARN"/>
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</logger>
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<logger name="org.springframework">
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<level value="WARN"/>
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</logger>
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<root>
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<level value="WARN"/>
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<appender-ref ref="CONSOLE"/>
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</root>
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</log4j:configuration>
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<?xml version="1.0" encoding="UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:cache="http://www.springframework.org/schema/cache"
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xmlns:context="http://www.springframework.org/schema/context"
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xmlns:p="http://www.springframework.org/schema/p"
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xsi:schemaLocation="http://www.springframework.org/schema/beans
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http://www.springframework.org/schema/beans/spring-beans.xsd
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http://www.springframework.org/schema/context
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http://www.springframework.org/schema/context/spring-context.xsd
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http://www.springframework.org/schema/cache
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http://www.springframework.org/schema/cache/spring-cache.xsd">
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<!-- Scans within the base package of the application for @Components to
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configure as beans -->
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<context:component-scan base-package="org.spring.cache.example" />
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<!-- Process cache annotations -->
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<cache:annotation-driven cache-manager="cacheManager"/>
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<bean id="viewResolver"
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class="org.springframework.web.servlet.view.InternalResourceViewResolver">
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<property name="viewClass">
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<value>org.springframework.web.servlet.view.JstlView</value>
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</property>
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<property name="prefix" value="/WEB-INF/views/" />
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<property name="suffix" value=".jsp" />
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</bean>
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<!-- Configuration for using Ehcache as the cache manager -->
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<!-- 使用ehcache配置缓存 -->
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<bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager" p:cache-manager-ref="ehcache" />
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<bean id="ehcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean" p:config-location="classpath:ehcache.xml" p:shared="true"/>
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<!-- Configuration for using SimpleCacheManager as the cache manager -->
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<!-- 使用Spring默认的缓存方案SimpleCacheManager,其内部使用了缺省的内存存储方案 ConcurrentMapCacheFactoryBean，它是基于 java.util.concurrent.ConcurrentHashMap 的一个内存缓存实现方案。 -->
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<!--
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<bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager">
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<property name="caches">
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<set>
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<bean
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class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean"
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p:name="default" />
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<bean
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class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean"
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p:name="employeeCache" />
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</set>
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</property>
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</bean>
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-->
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</beans>
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<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
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<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>Cache Example</title>
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</head>
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<body>
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<h1>This is ${message }</h1>
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</body>
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</html>
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<?xml version="1.0" encoding="UTF-8"?>
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<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
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<servlet>
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<servlet-name>sample</servlet-name>
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<servlet-class>
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org.springframework.web.servlet.DispatcherServlet
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</servlet-class>
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<init-param>
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<param-name>contextConfigLocation</param-name>
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<param-value>/WEB-INF/applicationContext.xml</param-value>
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</init-param>
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<load-on-startup>1</load-on-startup>
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</servlet>
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<servlet-mapping>
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<servlet-name>sample</servlet-name>
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<url-pattern>/</url-pattern>
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</servlet-mapping>
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</web-app>
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+72
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package org.spring.cache.example;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.test.context.ContextConfiguration;
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import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
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@ContextConfiguration(locations = "file:src/main/webapp/WEB-INF/applicationContext.xml")
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@RunWith(SpringJUnit4ClassRunner.class)
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public class EmployeeServiceTest {
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@Autowired
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EmployeeService employeeService;
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@Test
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public void getEmployee() {
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employeeService.getEmployee(1);
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employeeService.getEmployee(1);
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employeeService.getEmployee(2);
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employeeService.getEmployee(2);
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employeeService.getEmployee(3);
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employeeService.getEmployee(3);
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}
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@SuppressWarnings("unused")
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@Test
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public void testCache() {
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// 第一次查询，应该走数据库
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System.out.print("first query...");
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employeeService.getEmployeeByName("somebody");
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// 第二次查询，应该不查数据库，直接返回缓存的值
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System.out.print("second query...");
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employeeService.getEmployeeByName("somebody");
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System.out.println();
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System.out.println("start testing clear cache..."); // 更新某个记录的缓存，首先构造两个账号记录，然后记录到缓存中
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Employee employee1 = employeeService.getEmployeeByName("somebody1");
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Employee employee2 = employeeService.getEmployeeByName("somebody2");
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// 开始更新其中一个
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employee1.setId(1212);
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employeeService.updateEmployee(employee1);
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employeeService.getEmployeeByName("somebody1");// 因为被更新了，所以会查询数据库
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employeeService.getEmployeeByName("somebody2");// 没有更新过，应该走缓存
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employeeService.getEmployeeByName("somebody1");// 再次查询，应该走缓存 // 更新所有缓存
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employeeService.reload();
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employeeService.getEmployeeByName("somebody1");// 应该会查询数据库
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employeeService.getEmployeeByName("somebody2");// 应该会查询数据库
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employeeService.getEmployeeByName("somebody1");// 应该走缓存
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employeeService.getEmployeeByName("somebody2");// 应该走缓存
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}
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@Test
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public void testCacheCondition() {
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employeeService.getEmployeeByName("somebody");// 长度大于 4，不会被缓存
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employeeService.getEmployeeByName("sbd");// 长度小于 4，会被缓存
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employeeService.getEmployeeByName("somebody");// 还是查询数据库
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employeeService.getEmployeeByName("sbd");// 会从缓存返回
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}
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@Test
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public void testCachePut() {
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Employee employee = employeeService.getEmployeeByName("someone");
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employee.setAge(18);
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employeeService.updateEmployee(employee);
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employee.setAge(28);
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employeeService.updateEmployee(employee);
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employee = employeeService.getEmployeeByName("someone");
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System.out.println(employee.getEmpname());
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}
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}
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Reference in New Issue
Block a user