Redis工具類：支援任意型別物件快取,分散式鎖

阿新 • • 發佈：2019-01-26

使用到的技術點：泛型返回值，應用redisson實現分散式鎖，redis哨兵部署配置，redis叢集部署配置等。

/**
 * Copyright [email protected]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package framework.webapp.commons.utils;

import framework.webapp.commons.model.AjaxJson;
import java.util.concurrent.TimeUnit;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.redisson.Redisson;
import org.redisson.api.RBucket;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.redisson.config.Config;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * **************************************************
 * @description redis工具類，底層使用redisson
 * @author karl
 * @version 1.0, 2018-08-17
 * @see HISTORY
 * <p>
 * Date Desc Author Operation
 * </p>
 * <p>
 * 2018-8-17 建立檔案 karl create
 * </p>
 * @since 2017 Phyrose Science & Technology (Kunming) Co., Ltd.
 * ************************************************
 */
public class RedisUtil {

    private static final Log log = LogFactory.getLog(RedisUtil.class);

    private static final String DISTRIBUTED_LOCK_FLAG = "DistributedLock_";

    private static volatile RedissonClient redissonManager;


    public static RedissonClient getRedissonManager() {
        if (redissonManager == null) {
            synchronized (DISTRIBUTED_LOCK_FLAG) {
                if (redissonManager == null) {
                    //使用配置檔案
                    ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:spring-redisson.xml");
                    redissonManager = (RedissonClient) applicationContext.getBean("redissonManager");
                    //使用spring容器
                    //redissonManager = ApplicationContextUtil.getBean("redissonManager");
                }
            }
        }
        return redissonManager;
    }

//
//    private static Redisson getRedissonByteArray() {
//        if (redissonByteArray == null) {
//            synchronized (REDISSON_BYTEARRAY_LOCK) {
//               if (redissonByteArray == null) {
//                  redissonByteArray = ApplicationContextUtil.getBean("redissonManager");
//}
//            }
//        }
//        return redissonByteArray;
//    }

     /**
     * 根據name進行上鎖操作，Redisson分散式鎖 阻塞的，採用的機制釋出/訂閱
     * 自定義鎖超時
     * <pre> {@code
     *   try {
     *      RedisUtil.lock(1, TimeUnit.MINUTES);
     *     // manipulate protected state
     *   } finally {
     *     RedisUtil.unlock();
     *   }
     * }
     * </pre>
     *
     * <p>
     * If the lock is not available then the current thread becomes disabled for
     * thread scheduling purposes and lies dormant until the lock has been
     * acquired.
     *
     * If the lock is acquired, it is held until <code>unlock</code> is invoked,
     * or until leaseTime milliseconds have passed since the lock was granted -
     * whichever comes first.
     *
     * @param lockname
     *
     * @param leaseTime the maximum time to hold the lock after granting it,
     * before automatically releasing it if it hasn't already been released by
     * invoking <code>unlock</code>. If leaseTime is -1, hold the lock until
     * explicitly unlocked.
     * @param unit the time unit of the {@code leaseTime} argument
     *
     */
    public static void lock(String lockname, long leaseTime, TimeUnit unit) {
        String key = DISTRIBUTED_LOCK_FLAG + lockname;
        RLock lock = getRedissonManager().getLock(key);
        //lock提供帶timeout引數，timeout結束強制解鎖，防止死鎖 ：1分鐘
        lock.lock(leaseTime, unit);
    }

    /**
     * Redisson分散式鎖 根據name進行解鎖操作
     * 與lock一一對應
     * <pre> {@code
     *   try {
     *      RedisUtil.lock(1, TimeUnit.MINUTES);
     *     // manipulate protected state
     *   } finally {
     *     RedisUtil.unlock();
     *   }
     * }
     * </pre>
     *
     * @param lockname
     */
    public static void unlock(String lockname) {
        String key = DISTRIBUTED_LOCK_FLAG + lockname;
        RLock lock = getRedissonManager().getLock(key);
        lock.unlock();
    }

    /**
     * 根據name進行上鎖操作，Redisson分散式鎖 阻塞的，採用的機制釋出/訂閱,鎖超時：預設1分鐘自動釋放鎖
     * <pre> {@code
     *   try {
     *      RedisUtil.lock();
     *     // manipulate protected state
     *   } finally {
     *     RedisUtil.unlock();
     *   }
     * }
     * </pre>
     *
     * @param lockname
     */
    public static void lock(String lockname) {
        String key = DISTRIBUTED_LOCK_FLAG + lockname;
        RLock lock = getRedissonManager().getLock(key);
        //lock提供帶timeout引數，timeout結束強制解鎖，防止死鎖 ：1分鐘
        lock.lock(1, TimeUnit.MINUTES);
    }

    /**
     * 從Redis獲取key為name的資料，並封裝為指定class例項，可能發生執行時異常
     *
     * @param <T> 泛型支援
     * @param clazz
     * @param name
     * @return
     */
    public static <T> T get(Class<T> clazz, String name) {
        RBucket<byte[]> keyObject = getRedissonManager().getBucket(name);
        byte[] bytes = keyObject.get();
        if (bytes == null) {
            return null;
        }
        return SerializationUtil.deserialize(clazz, keyObject.get());
    }

    /**
     * 根據name清除資料
     *
     * @param name
     */
    public static void remove(String name) {
        getRedissonManager().getBucket(name).delete();
    }

    /**
     * 快取資料到Redis,無超時
     *
     * @param name
     * @param value
     */
    public static void put(String name, Object value) {
        RBucket<byte[]> keyObject = getRedissonManager().getBucket(name);
        keyObject.set(SerializationUtil.serialize(value));
    }

    /**
     * 快取資料到Redis
     *
     * @param name
     * @param value
     * @param timeToLive
     * @param timeUnit
     */
    public static void put(String name, Object value, long timeToLive, TimeUnit timeUnit) {
        RBucket<byte[]> keyObject = getRedissonManager().getBucket(name);
        keyObject.set(SerializationUtil.serialize(value), timeToLive, timeUnit);
    }

    /**
     * 按分鐘（計算超時）快取資料
     *
     * @param name
     * @param value
     * @param timeToLive
     */
    public static void putCacheWithMinutes(String name, Object value, long timeToLive) {
        RBucket<byte[]> keyObject = getRedissonManager().getBucket(name);
        keyObject.set(SerializationUtil.serialize(value), timeToLive, TimeUnit.MINUTES);
    }

    public static void main(String[] args) {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:spring-redisson.xml");
        RedissonClient redisson = (RedissonClient) applicationContext.getBean("redissonManager");
        // 首先獲取redis中的key-value物件，key不存在沒關係
       // System.out.println(get(UserEntity.class, DISTRIBUTED_LOCK_FLAG));
        put("keyBytes", "keyBytes");
        System.out.println(get(String.class, "keyBytes"));
        //RBucket<String> keyObject = redisson.getBucket("key");
        //RBucket<byte[]> keyObject = redisson.getBucket("keyBytes");
        //System.out.println("ok:" + keyObject.get());
        // 如果key存在，就設定key的值為新值value
        // 如果key不存在，就設定key的值為value
       // keyObject.set("value".getBytes());
        redisson.shutdown();
    }

}

maven依賴：spring mvc，apache log

<dependency>
<groupId>org.redisson</groupId>
<artifactId>redisson</artifactId>
<version>3.5.4</version>
</dependency>


<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>4.1.7.Final</version>
</dependency>

<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.9.0</version>
<type>jar</type>
</dependency>

配置檔案：

spring-redisson.xml

redis哨兵配置示例sentinel-26379.conf：

##sentinel例項之間的通訊埠

daemonize yes

port 26379

#redis-master

sentinel myid 9028ea0dc586c123e58dca922f4ce406e7666cb6

sentinel monitor redis-master 127.0.0.1 6379 1

sentinel down-after-milliseconds redis-master 5000

sentinel failover-timeout redis-master 900000

#sentinel auth-pass redis-master 123456

logfile "./sentinel.log"

redis叢集從配置示例redis16379-slave.conf：

bind 127.0.0.1

protected-mode yes

port 16379

tcp-backlog 511

# Close the connection after a client is idle for N seconds (0 to disable)
timeout 0

# A reasonable value for this option is 60 seconds.
tcp-keepalive 0

# Specify the server verbosity level.
# This can be one of:
# debug (a lot of information, useful for development/testing)
# verbose (many rarely useful info, but not a mess like the debug level)
# notice (moderately verbose, what you want in production probably)
# warning (only very important / critical messages are logged)
loglevel notice

# Specify the log file name. Also 'stdout' can be used to force
# Redis to log on the standard output.
logfile ""

# Set the number of databases. The default database is DB 0, you can select
# a different one on a per-connection basis using SELECT <dbid> where
# dbid is a number between 0 and 'databases'-1
databases 16

################################ SNAPSHOTTING ################################
#
# Save the DB on disk:
#
# save <seconds> <changes>
#
# Will save the DB if both the given number of seconds and the given
# number of write operations against the DB occurred.
#
# In the example below the behaviour will be to save:
# after 900 sec (15 min) if at least 1 key changed
# after 300 sec (5 min) if at least 10 keys changed
# after 60 sec if at least 10000 keys changed
#
# Note: you can disable saving completely by commenting out all "save" lines.
#
# It is also possible to remove all the previously configured save
# points by adding a save directive with a single empty string argument
# like in the following example:
#
# save ""

save 900 1
save 300 10
save 60 10000

stop-writes-on-bgsave-error yes

rdbcompression yes

rdbchecksum yes

# The filename where to dump the DB
dbfilename dump.rdb

dir ./

slaveof 127.0.0.1 6379

# If the master is password protected (using the "requirepass" configuration
# directive below) it is possible to tell the slave to authenticate before
# starting the replication synchronization process, otherwise the master will
# refuse the slave request.
#
# masterauth <master-password>

# When a slave loses its connection with the master, or when the replication
# is still in progress, the slave can act in two different ways:
#
# 1) if slave-serve-stale-data is set to 'yes' (the default) the slave will
# still reply to client requests, possibly with out of date data, or the
# data set may just be empty if this is the first synchronization.
#
# 2) if slave-serve-stale-data is set to 'no' the slave will reply with
# an error "SYNC with master in progress" to all the kind of commands
# but to INFO and SLAVEOF.
#
slave-serve-stale-data yes

slave-read-only yes

repl-diskless-sync no

repl-diskless-sync-delay 5

# Slaves send PINGs to server in a predefined interval. It's possible to change
# this interval with the repl_ping_slave_period option. The default value is 10
# seconds.
#
# repl-ping-slave-period 10

# The following option sets the replication timeout for:
#
# 1) Bulk transfer I/O during SYNC, from the point of view of slave.
# 2) Master timeout from the point of view of slaves (data, pings).
# 3) Slave timeout from the point of view of masters (REPLCONF ACK pings).
#
# It is important to make sure that this value is greater than the value
# specified for repl-ping-slave-period otherwise a timeout will be detected
# every time there is low traffic between the master and the slave.
#
# repl-timeout 60

repl-disable-tcp-nodelay no

slave-priority 100

################################### LIMITS ####################################

# Set the max number of connected clients at the same time. By default
# this limit is set to 10000 clients, however if the Redis server is not
# able to configure the process file limit to allow for the specified limit
# the max number of allowed clients is set to the current file limit
# minus 32 (as Redis reserves a few file descriptors for internal uses).
#
# Once the limit is reached Redis will close all the new connections sending
# an error 'max number of clients reached'.
#
# maxclients 10000

# If Redis is to be used as an in-memory-only cache without any kind of
# persistence, then the fork() mechanism used by the background AOF/RDB
# persistence is unnecessary. As an optimization, all persistence can be
# turned off in the Windows version of Redis. This will redirect heap
# allocations to the system heap allocator, and disable commands that would
# otherwise cause fork() operations: BGSAVE and BGREWRITEAOF.
# This flag may not be combined with any of the other flags that configure
# AOF and RDB operations.
# persistence-available [(yes)|no]

# Don't use more memory than the specified amount of bytes.
# When the memory limit is reached Redis will try to remove keys
# according to the eviction policy selected (see maxmemory-policy).
#
# If Redis can't remove keys according to the policy, or if the policy is
# set to 'noeviction', Redis will start to reply with errors to commands
# that would use more memory, like SET, LPUSH, and so on, and will continue
# to reply to read-only commands like GET.
#
# This option is usually useful when using Redis as an LRU cache, or to set
# a hard memory limit for an instance (using the 'noeviction' policy).
#
# WARNING: If you have slaves attached to an instance with maxmemory on,
# the size of the output buffers needed to feed the slaves are subtracted
# from the used memory count, so that network problems / resyncs will
# not trigger a loop where keys are evicted, and in turn the output
# buffer of slaves is full with DELs of keys evicted triggering the deletion
# of more keys, and so forth until the database is completely emptied.
#
# In short... if you have slaves attached it is suggested that you set a lower
# limit for maxmemory so that there is some free RAM on the system for slave
# output buffers (but this is not needed if the policy is 'noeviction').
#
# WARNING: not setting maxmemory will cause Redis to terminate with an
# out-of-memory exception if the heap limit is reached.
#
# NOTE: since Redis uses the system paging file to allocate the heap memory,
# the Working Set memory usage showed by the Windows Task Manager or by other
# tools such as ProcessExplorer will not always be accurate. For example, right
# after a background save of the RDB or the AOF files, the working set value
# may drop significantly. In order to check the correct amount of memory used
# by the redis-server to store the data, use the INFO client command. The INFO
# command shows only the memory used to store the redis data, not the extra
# memory used by the Windows process for its own requirements. Th3 extra amount
# of memory not reported by the INFO command can be calculated subtracting the
# Peak Working Set reported by the Windows Task Manager and the used_memory_peak
# reported by the INFO command.
#
# maxmemory <bytes>

appendonly no

# The name of the append only file (default: "appendonly.aof")
appendfilename "appendonly.aof"

# The fsync() call tells the Operating System to actually write data on disk
# instead of waiting for more data in the output buffer. Some OS will really flush
# data on disk, some other OS will just try to do it ASAP.
#
# Redis supports three different modes:
#
# no: don't fsync, just let the OS flush the data when it wants. Faster.
# always: fsync after every write to the append only log. Slow, Safest.
# everysec: fsync only one time every second. Compromise.
#

# If unsure, use "everysec".

# appendfsync always
appendfsync everysec

no-appendfsync-on-rewrite no

auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb

aof-load-truncated yes

lua-time-limit 5000

slowlog-log-slower-than 10000

slowlog-max-len 128

latency-monitor-threshold 0

hash-max-ziplist-entries 512
hash-max-ziplist-value 64

list-max-ziplist-size -2

list-compress-depth 0

set-max-intset-entries 512

zset-max-ziplist-entries 128
zset-max-ziplist-value 64

hll-sparse-max-bytes 3000

client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60

hz 10

附記：

為方便讀者測試redis哨兵部署和叢集部署效果，共享一個一鍵本地啟動java工具類，配置檔案請參考如上所示，並修改相應埠（哨兵部署需要複製並修改生成3個，叢集部署需要複製並修改生成6個）。


import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by dufy on 2017/3/28.
 *
 * cmd /c dir 是執行完dir命令後關閉命令視窗。<br/>
 * cmd /k dir 是執行完dir命令後不關閉命令視窗.<br/>
 * cmd /c start dir 會開啟一個新視窗後執行dir指令，原視窗會關閉。<br/>
 * cmd /k start dir 會開啟一個新視窗後執行dir指令，原視窗不會關閉。<br/>
 * redis-cli.exe -h 127.0.0.1 -p 埠<br/>
 * info replication -- 檢視主從複製<br/>
 * info sentinel-- 檢視哨兵情況<br/>
 *
 * window本地搭redis的哨兵模式：http://blog.csdn.net/liuchuanhong1/article/details/53206028<br/><br/>
 *
 * 啟動服務工具類
 */
public class StartRedisServer {

    private final static String redisRootPath = "E:/Redis-x64-3.2.100";

    public static void main(String[] args) {
        List<String> cmds = new ArrayList<String>();
        //三主三從叢集模式
        String cmdRedis6379 = "cmd /k start redis-server.exe redis6379.conf ";//redis-server.exe master redis.conf
        String cmdRedis16379 = "cmd /k start redis-server.exe redis16379-slave.conf ";//redis-server.exe slave redis.conf
        String cmdRedis6380 = "cmd /k start redis-server.exe redis6380.conf ";//redis-server.exe master  redis.conf
        String cmdRedis16380 = "cmd /k start redis-server.exe redis16380-slave.conf ";//redis-server.exe slave redis.conf
        String cmdRedis6381 = "cmd /k start redis-server.exe redis6381.conf ";//redis-server.exe master  redis.conf
        String cmdRedis16381 = "cmd /k start redis-server.exe redis16381-slave.conf ";//redis-server.exe slave redis.conf

//        cmds.add(cmdRedis6379);
//        cmds.add(cmdRedis16389);
//        cmds.add(cmdRedis6380);
//        cmds.add(cmdRedis16380);
//        cmds.add(cmdRedis6381);
//        cmds.add(cmdRedis16381);

        //哨兵模式
        String cmdRedis26379 = "cmd /k start redis-server.exe sentinel-26379.conf --sentinel";//redis-server.exe sentinel26479.conf --sentinel
        String cmdRedis26479 = "cmd /k start redis-server.exe sentinel-26380.conf --sentinel";//redis-server.exe sentinel26479.conf --sentinel
        String cmdRedis26579 = "cmd /k start redis-server.exe sentinel-26381.conf --sentinel";//redis-server.exe sentinel26479.conf --sentinel

        cmds.add(cmdRedis26379);
        cmds.add(cmdRedis26479);
        cmds.add(cmdRedis26579);

        initRedisServer(cmds);
    }

    public static void initRedisServer(List<String> cmdStr) {
        if (cmdStr != null && cmdStr.size() > 0) {
            for (String cmd : cmdStr) {
                try {
                    Process exec = Runtime.getRuntime().exec(cmd, null, new File(redisRootPath));
                    Thread.sleep(1 * 1000);
                } catch (InterruptedException e) {
                    System.out.println("執行緒中斷異常" + e.getMessage());
                    e.printStackTrace();
                } catch (IOException e) {
                    System.out.println("cmd command error" + e.getMessage());
                    e.printStackTrace();
                }

            }
        }

    }
}

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