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java手写多级缓存

2019年07月06日  | 移动技术网IT编程  | 我要评论

 

多级缓存实现类，时间有限，该类未抽取接口，目前只支持两级缓存：jvm缓存（实现 请查看上一篇：java 手写jvm高性能缓存）、redis缓存（在spring 的 redistemplate 基础实现）

package com.ws.commons.cache;

import java.util.function.supplier;

import com.ws.commons.tool.threadtool;

/**
 * 多级缓存实现
 * 
 * @author 尘无尘
 *
 */
public class multilevelcache {

    private multilevelcache() {
    }

    private static final icache first_leve_lcache = localcache.instance();
    private static icache secondcache;

    private static final string lock_prefix = "muilcache_lock:";

    public static synchronized void init(icache secondcache) {
        if (multilevelcache.secondcache == null) {
            multilevelcache.secondcache = secondcache;
        }
    }

    public static void put(string key, object value, int timeoutsecond) {
        first_leve_lcache.put(key, value, timeoutsecond);
        if (secondcache != null) {
            secondcache.put(key, value, timeoutsecond);
        }
    }

    /**
     * 提供数据，并缓存
     * 
     * @param key
     * @param supplier
     * @return
     */
    @suppresswarnings("unchecked")
    public static <t> t getforload(string key, supplier<t> supplier) {
        t data = first_leve_lcache.get(key);
        if (data == null && secondcache != null) {
            data = (t) secondcache.get(key);
        }
        if (data != null) {
            return data;
        }

        synchronized (threadtool.buildlock(lock_prefix, key)) {
            data = first_leve_lcache.get(key);
            if (data == null && secondcache != null) {
                data = (t) secondcache.get(key);
            }
            if (data != null) {
                return data;
            }

            data = supplier.get();
            if (secondcache != null) {
                secondcache.put(key, data);
            }
            first_leve_lcache.put(key, data);
        }
        return data;
    }

    /**
     * 提供数据，并缓存一定的时间
     * 
     * @param key
     * @param timeoutsecond
     * @param supplier
     * @return
     */
    @suppresswarnings("unchecked")
    public static <t> t getforload(string key, int timeoutsecond, supplier<t> supplier) {
        t data = first_leve_lcache.get(key);
        if (data == null && secondcache != null) {
            data = (t) secondcache.get(key);
        }
        if (data != null) {
            return data;
        }
        synchronized (threadtool.buildlock(lock_prefix, key)) {
            data = first_leve_lcache.get(key);
            if (data == null && secondcache != null) {
                data = (t) secondcache.get(key);
            }
            if (data != null) {
                return data;
            }
            data = supplier.get();
            if (secondcache != null) {
                secondcache.put(key, data, timeoutsecond);
            }
            first_leve_lcache.put(key, data, timeoutsecond);
        }
        return data;
    }

    @suppresswarnings("unchecked")
    public static <t> t removeandget(string key) {
        t data = null;
        if (secondcache != null) {
            data = (t) secondcache.removeandget(key);
        }
        t data2 = first_leve_lcache.removeandget(key);
        if (data == null) {
            data = data2;
        }
        return data;
    }

    public static void remove(string key) {
        if (secondcache != null) {
            secondcache.remove(key);
        }
        first_leve_lcache.remove(key);
    }

    @suppresswarnings("unchecked")
    public static <t> t get(string key) {
        t data = first_leve_lcache.get(key);
        if (data == null && secondcache != null) {
            data = (t) secondcache.get(key);
        }
        return data;
    }

    public static void expire(string key, int timeoutsecond) {
        first_leve_lcache.expire(key, timeoutsecond);
        if (secondcache != null) {
            secondcache.expire(key, timeoutsecond);
        }
    }

}

 

redis缓存实现类

package com.walmart.cirular.interfaces.application;

import java.util.concurrent.timeunit;

import org.springframework.beans.factory.annotation.autowired;
import org.springframework.data.redis.core.redistemplate;
import org.springframework.stereotype.component;

import com.ws.commons.cache.icache;

/**
 * redis 缓存实现类
 * 
 * @author 尘无尘
 *
 */
@component
public class redisicacheimpl implements icache {

    @autowired(required = false)
    private redistemplate<string, object> redistemplate;

    @override
    public void put(string key, object value) {
        redistemplate.opsforvalue().set(key, value);
    }

    @override
    public void put(string key, object value, int timeoutsecond) {
        redistemplate.opsforvalue().set(key, value, (long) timeoutsecond, timeunit.seconds);
    }

    @suppresswarnings("unchecked")
    @override
    public <t> t get(string key) {
        t t = (t) redistemplate.opsforvalue().get(key);
        redistemplate.delete(key);
        return t;
    }

    @override
    public void remove(string key) {
        redistemplate.delete(key);
    }

    @suppresswarnings("unchecked")
    @override
    public <t> t removeandget(string key) {
        object obj = get(key);
        redistemplate.delete(key);
        return (t) obj;
    }

    @override
    public void rightpush(string key, object value, int timeoutsecond) {
        redistemplate.opsforlist().rightpush(key, value);
        redistemplate.expire(key, timeoutsecond, timeunit.seconds);
    }

    @suppresswarnings("unchecked")
    @override
    public <t> t rightpop(string key) {
        return (t) redistemplate.opsforlist().rightpop(key);
    }

    @suppresswarnings("unchecked")
    @override
    public <t> t leftpop(string key) {
        return (t) redistemplate.opsforlist().leftpop(key);
    }

    @override
    public void leftpush(string key, object value) {
        redistemplate.opsforlist().leftpush(key, value);
    }

    @override
    public void rightpush(string key, object value) {
        redistemplate.opsforlist().rightpush(key, value);
    }

    @override
    public void expire(string key, int timeoutsecond) {
        redistemplate.expire(key, timeoutsecond, timeunit.seconds);
    }

    @override
    public boolean haskey(string key) {
        return redistemplate.haskey(key);
    }

    @override
    public boolean putifabsent(string key, object value) {
        return redistemplate.opsforvalue().setifabsent(key, value);
    }

    @override
    public boolean putifabsent(string key, object value, int timeoutsecond) {
        boolean flag = putifabsent(key, value);
        if (flag) {
            expire(key, timeoutsecond);
        }
        return flag;
    }

}

 

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