spring boot spring cache ehcache3.x整合

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http://blog.csdn.net/qq18998401056/article/details/53467671

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在Spring Boot中通过@EnableCaching注解自动化配置合适的缓存管理器（CacheManager），Spring Boot根据下面的顺序去侦测缓存提供者：
Generic
JCache (JSR-107)
EhCache 2.x
Hazelcast
Infinispan
Redis
Guava
Simple
除了按顺序侦测外，我们也可以通过配置属性spring.cache.type来强制指定。默认是simple类型。
由于ehcache3.x实现了jsr-107的标准接口，而本文通过整合ehcache3.x来使用JCache的方式。
引入依赖如下:

<dependency>

          <groupId>org.ehcache</groupId>

          <artifactId>ehcache</artifactId>

          <version>3.1.3</version>

        </dependency>

        <!-- JSR107 API -->

        <dependency>

          <groupId>javax.cache</groupId>

          <artifactId>cache-api</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-cache</artifactId>

        </dependency>

ehcache 3.x配置文件如下:

<?xml version="1.0" encoding="UTF-8"?>

<config

  xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'

  xmlns:jsr107='http://www.ehcache.org/v3/jsr107'

  xmlns='http://www.ehcache.org/v3'

  xsi:schemaLocation="

        http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.1.xsd

        http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.1.xsd">

  <!-- <service>

    <jsr107:defaults>

      <jsr107:cache name="city" template="heap-cache"/>

    </jsr107:defaults>

  </service> -->

  <cache-template name="heap-cache">

    <resources>

      <heap unit="entries">2000</heap>

      <offheap unit="MB">100</offheap>

    </resources>

  </cache-template>

  <cache alias="city" uses-template="heap-cache">

    <expiry>

      <ttl unit="seconds">40</ttl>

    </expiry>

  </cache> 

</config>

spring boot application.properties配置如下:

#注意:ehcache3.x配置文件路径必须指定

spring.cache.jcache.config=classpath:ehcache.xml

在spring boot 使用@EnableCaching 开启缓存
最后，贴出spring cache注解例子伪代码：

package com.lrh.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.cache.annotation.CacheConfig;

import org.springframework.cache.annotation.CacheEvict;

import org.springframework.cache.annotation.CachePut;

import org.springframework.cache.annotation.Cacheable;

import org.springframework.stereotype.Service;

import org.springframework.transaction.annotation.Transactional;

import com.github.pagehelper.PageHelper;

import com.github.pagehelper.PageInfo;

import com.lrh.dao.CityMapper;

import com.lrh.domain.City;

import com.lrh.iservice.CityService;

@Service

@Transactional

@CacheConfig(cacheNames = "city")

//@CacheDefaults(cacheName = "city")

public class CityServiceImpl implements CityService{

    @Autowired

    private CityMapper cityMapper;

    @Override

    @CachePut(key = "#id")

    public City editCity(String id, String name) {

        cityMapper.edit(id, name);

        City city=new City();

        city.setId(Long.valueOf(id));

        city.setName(name);

        return city;

    }

    @Override

    public PageInfo<City> selectCityByPage() {

         PageHelper.startPage(1,5);

         List<City> list = cityMapper.selectAll();

         PageInfo<City> page = new PageInfo(list);

         return page;

    }

    /**

     * condition满足缓存条件的数据才会放入缓存，condition在调用方法之前和之后都会判断

     * unless用于否决缓存更新的，不像condition，该表达只在方法执行之后判断，此时可以拿到返回值result进行判断了

     */

    @Override

    @Cacheable(key = "#id",unless="#result == null")

    //@CacheResult

    public City findById(String id) {

        return cityMapper.selectCityById(id);

    }

    @Override

    @CacheEvict(key="#id")

    public void delete(String id) {

        //cityMapper.delete(id);

    }

    /**

     * allEntries移除所有

     */

    @Override

    @CacheEvict(allEntries = true)

    public void deleteAll() {

        cityMapper.deleteAll();

    }

}