Atitit spring cache key的生成 与ken生成规范

 

1. Good key name meth.params 1

1.1. Use epl 的mode but only clss method ,and single param 1

1.2. 4、自定义key生成器 1

1.3. Spring xml cfg 2

1.4. CacheKeyGeneratorSpring 5

 

1. Good key name meth.params

Good  key gene is class.method as package...

Param as sub package..

 

1.1. Use epl 的mode but only clss method ,and single param

1.2. 4、自定义key生成器

[java] view plain copy

1. @Cacheable(value="gomeo2oCache", keyGenerator = "keyGenerator")  

2. public ResultDTO method(User user);  

注意：Spring默认的SimpleKeyGenerator是不会将函数名组合进key中的

 

 

 

使用@EnableCaching启用Cache注解支持；

2、实现CachingConfigurer，然后注入需要的cacheManager和keyGenerator；从spring4开始默认的keyGenerator是SimpleKeyGenerator；

 

 

 

即如果只有一个参数，就使用参数作为key，否则使用SimpleKey作为key。

 

我们也可以自定义自己的key生成器，然后通过xml风格的<cache:annotation-driven key-generator=""/>或注解风格的CachingConfigurer中指定keyGenerator。 

 

 

 

<!--  ati cache cfg-->

<bean id="CacheKeyGeneratorSpringAti" class="com.cnhis.cloudhealth.clinical.util.cache.CacheKeyGeneratorSpring">

        

    </bean>

   <context:annotation-config/>

<cache:annotation-driven key-generator="CacheKeyGeneratorSpringAti"/>

 

3. 使用  direct use or ,define the @Cacheable(value="gomeo2oCache", keyGenerator = "keyGenerator")  

If cfg in spring xml..then default use ..

spring

 

 

 

 

 

1.3. Spring xml cfg

 

<!--  ati cache cfg-->

<bean id="CacheKeyGeneratorSpringAti" class="com.cnhis.cloudhealth.clinical.util.cache.CacheKeyGeneratorSpring">

        

    </bean>

   <context:annotation-config/>

<cache:annotation-driven key-generator="CacheKeyGeneratorSpringAti"/>

<!--

<bean id="cacheManager"

 

                 class="org.springframework.cache.concurrent.ConcurrentMapCacheManager" />

                 //C:\0wkspc\clis413\clinical\src\main\java\com\cnhis\cloudhealth\clinical\util\cache\MyConcurrentMapCacheManager.java

                 -->

 

 <!--  (long expireTime sec, long maximumSize)  

    <bean id="cacheManager"

        class="com.cnhis.cloudhealth.clinical.util.cache.MyConcurrentMapCacheManager">

        <constructor-arg index="0" value="70" />

        <constructor-arg index="1" value="500000" />

    </bean>    

 

  <context:property-placeholder location="classpath:META-INF/prop/redis.properties"/>

    -->

    <context:property-placeholder  location="classpath:META-INF/prop/redis.properties,classpath*:/META-INF/prop/newid.properties,classpath*:/META-INF/prop/jdbc.properties" />

     

 

  

   <!--缓存管理器-->

    <bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager">

        <property name="caches">

            <set>

                <!--自定义的redis缓存操作实现-->

                <bean class="com.cnhis.cloudhealth.clinical.util.cache.SpringCacheWzRedis">

                    <property name="name" value="Cachename1"/>

                    <property name="redisTemplate" ref="redisTemplate"/>

                </bean>

            </set>

        </property>

    </bean>

    <!--redis连接池配置-->

    <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">

        <property name="maxIdle" value="${redis.maxIdle}"/>

        <!--

        <property name="maxTotal" value="${redis.maxTotal}"/>

        -->

        <property name="testOnBorrow" value="${redis.testOnBorrow}"/>

    </bean>

    <!--redis连接工厂配置-->

    <bean id="connectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">

        <property name="hostName" value="${redis.host}"/>

        <property name="port" value="${redis.port}"/>

        <property name="password" value="${redis.pass}"/>

        <property name="poolConfig" ref="poolConfig"/>

        <property name="usePool" value="true"/>

        <property name="database" value="2"/>

    </bean>

    <!--redis操作模板-->

    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">

        <property name="connectionFactory" ref="connectionFactory"/>

    </bean>

  

 

<!-- end ati cache -->

 

<!-- end ati cache -->

 

 

 

 

1.4. CacheKeyGeneratorSpring 

 

 

 

package com.cnhis.cloudhealth.clinical.util.cache;

 

import java.lang.reflect.Array;

import java.lang.reflect.Method;

import java.nio.charset.Charset;

import java.util.Map;

 

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.cache.interceptor.KeyGenerator;

import org.springframework.util.ClassUtils;

 

import com.alibaba.fastjson.JSON;

import com.google.common.hash.Hashing;

 

//   com.cnhis.cloudhealth.clinical.util.cache.CacheKeyGeneratorSpring

public class CacheKeyGeneratorSpring implements KeyGenerator {  

    // custom cache key  

    public static final int NO_PARAM_KEY = 0;  

    public static final int NULL_PARAM_KEY = 53;  

private static Logger log = LoggerFactory.getLogger(CacheKeyGeneratorSpring.class);

    @Override  

    public Object generate(Object target, Method method, Object... params) {  

  

        StringBuilder key = new StringBuilder();  

        key.append(target.getClass().getSimpleName()).append(".").append(method.getName()).append(":");  

        if (params.length == 0) {  

            return key.append(NO_PARAM_KEY).toString();  

        }  

        for (Object param : params) {  

            if (param == null) {  

                log.warn("input null param for Spring cache, use default key={}", NULL_PARAM_KEY);  

                key.append(NULL_PARAM_KEY);  

            } else if (ClassUtils.isPrimitiveArray(param.getClass())) {  

                int length = Array.getLength(param);  

                for (int i = 0; i < length; i++) {  

                    key.append(Array.get(param, i));  

                    key.append(',');  

                }  

            } else if (ClassUtils.isPrimitiveOrWrapper(param.getClass()) || param instanceof String) {  

                key.append(param);  

            } else {  

                log.warn("Using an object as a cache key may lead to unexpected results. " +  

                        "Either use @Cacheable(key=..) or implement CacheKey. Method is " + target.getClass() + "#" + method.getName());  

              //  key.append(param.hashCode());  

                if(  param instanceof Map  )

                {

                 key.append( JSON.toJSONString(param) );  

                }

            }  

            

            

            key.append('-');  

        }  

  

        String finalKey = key.toString();  

        long cacheKeyHash = Hashing.murmur3_128().hashString(finalKey, Charset.defaultCharset()).asLong();  

        log.debug("using cache key={} hashCode={}", finalKey, cacheKeyHash);  

        return key.toString();  

    }

 

 

}