Redis多数据源，看这篇就够了

背景

Redis多数据源常见的场景：

• 分区数据处理：当数据量增长时，单个Redis实例可能无法处理所有的数据。通过使用多个Redis数据源，可以将数据分区存储在不同的实例中，使得数据处理更加高效。
  
• 多租户应用程序：对于多租户应用程序，每个租户可以拥有自己的Redis数据源，以确保数据隔离和安全性。
  

现在在网上的一些办理方案无法完全满足特定需求，比方不支持动态添加或更新数据源、缺乏数据源的负载均衡功能，大概不能开箱即用必要自行封装一些常用方法。
为相识决这些题目，封装了一个轻量级的Redis多数据源库，已在生产环境中长时间稳固运行。现分享出来，盼望这个库能对你的项目有所帮助。

https://github.com/codebaorg/redis-keeper
如果这篇文章帮助到了你，欢迎star一下，感谢你的支持。
特性

• 基于redisson封装，保存redisson的所有强盛功能。
  
• 支持redis多数据源设置的及时更新。
  
• 支持redis多数据源的负载均衡。
  
• 支持redis数据源的“只读”、“只写”、“读写”、“跳过”的状态切换。
  
• 提供 130+ 常用的redis操纵方法，包括但不限string、list、hash、set、zset、geo、bitmap、hyberloglog、分布式锁、布隆过滤器、限流等。
  

快速开始

• 添加maven依赖
  

1. <dependency>
2.     <groupId>org.redisson</groupId>
3.     <artifactId>redisson</artifactId>
4.     <version>3.15.5</version>
5.     <scope>provided</scope>
6. </dependency>
8. <dependency>
9.         <groupId>org.codeba</groupId>
10.         <artifactId>redis-keeper-spring-boot-starter</artifactId>
11.         <version>2024.0.0</version>
12. </dependency>

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• springboot的设置文件，添加redis多数据源的设置
  

1. redis-keeper:
2.   redis:
3.     datasource:
4.       ds1: // 此处的命名可以随便取，但是要保证唯一不重复
5.         host: localhost
6.         port: 6379
7.         database: 0
8.         password: yourPass
9.       
10.       ds2: // 此处的命名可以随便取，但是要保证唯一不重复
11.         host: localhost
12.         port: 6379
13.         database: 0
14.         password: yourPass
15.         

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• 按自定义的数据源别名获取相应的cacheTemplate，执行redis下令。
  

方式一：通过CacheTemplateProvider获取cacheTemplate，示比方下：

1. public class AppTest {
3.     @Autowired
4.     private CacheTemplateProvider<CacheTemplate> provider;
6.     public void test() {
7.         final Optional<CacheTemplate> templateOptional = provider.getTemplate("ds1");
9.         if (templateOptional.isPresent()) {
10.             final CacheTemplate cacheTemplate = templateOptional.get();
11.             String key = "foo";
12.             String value = "bar";
13.             cacheTemplate.set(key, value);
14.         }
15.     }
16.    
17. }

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方式二：通过代理类CacheTemplateProxy获取cacheTemplate，示比方下：

1. public class AppTest {
3.     private final CacheTemplate cacheTemplate = CacheTemplateProxy.asTemplate("ds1");
5.     public void test() {
6.         String key = "foo";
7.         String value = "bar";
8.         cacheTemplate.set(key, value);
9.     }
10.    
11. }

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更多示例

多数据源及时更新

必要：spring cloud + nacos
现有的数据源设置示比方下：

1. redis-keeper:
2.   redis:
3.     datasource:
4.       ds1:
5.         host: localhost
6.         port: 6379
7.         database: 10
8.         password: xxx
9.         invoke-params-print: true

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测试方法：

1. @RestController
2. @RequiredArgsConstructor
3. public class TestController {
5.     private final CacheTemplateProvider<CacheTemplate> provider;
7.     @RequestMapping("/test")
8.     public void testRefresh() {
9.         final Optional<CacheTemplate> templateOptional = provider.getTemplate("ds1");
10.         templateOptional.ifPresent(cacheTemplate -> {
11.             cacheTemplate.set("foo", "bar");
12.             cacheTemplate.del("foo");
13.         });
14.     }
17. }

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访问上面的方法，日记打印如下（可以看到写入的redis库是10库）：

1. 2024-03-12T11:33:37.850+08:00  INFO 62914 --- [nio-8000-exec-1] o.c.r.k.support.DefaultRedissonTemplate  : cmd:set, params:[foo, bar], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=10}]
2. 2024-03-12T11:33:37.858+08:00  INFO 62914 --- [nio-8000-exec-1] o.c.r.k.support.DefaultRedissonTemplate  : cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=10}]

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修改数据源设置，比如修改库为0库，此时可以看到nacos设置及时更新日记：

1. 2024-03-12T11:43:51.683+08:00  INFO 62914 --- [r-localhost-216] com.alibaba.nacos.common.remote.client   : [6253dca3-136e-4ac1-b894-fb4c11483703_config-0] Receive server push request, request = ConfigChangeNotifyRequest, requestId = 1
2. 2024-03-12T11:43:51.683+08:00  INFO 62914 --- [r-localhost-216] c.a.n.client.config.impl.ClientWorker    : [6253dca3-136e-4ac1-b894-fb4c11483703_config-0] [server-push] config changed. dataId=redis-keeper-demo.yaml, group=DEFAULT_GROUP,tenant=null
3. 2024-03-12T11:43:51.684+08:00  INFO 62914 --- [r-localhost-216] com.alibaba.nacos.common.remote.client   : [6253dca3-136e-4ac1-b894-fb4c11483703_config-0] Ack server push request, request = ConfigChangeNotifyRequest, requestId = 1
4. 2024-03-12T11:43:51.700+08:00  INFO 62914 --- [s.client.Worker] c.a.n.client.config.impl.ClientWorker    : [fixed-localhost_8848] [data-received] dataId=redis-keeper-demo.yaml, group=DEFAULT_GROUP, tenant=, md5=dddd513021564c6d6322e18783ac4f2b, content=server:
6. redis-keeper:
7.   redis:
8.     datasource:
9.       ds1:
10.         host: localhost
11.     ..., type=yaml
12. 2024-03-12T11:43:51.701+08:00  INFO 62914 --- [s.client.Worker] c.a.nacos.client.config.impl.CacheData   : [fixed-localhost_8848] [notify-listener] time cost=0ms in ClientWorker, dataId=redis-keeper-demo.yaml, group=DEFAULT_GROUP, md5=dddd513021564c6d6322e18783ac4f2b, listener=com.alibaba.cloud.nacos.refresh.NacosContextRefresher$1@178412d1
13. 2024-03-12T11:43:51.701+08:00  INFO 62914 --- [ternal.notifier] c.a.nacos.client.config.impl.CacheData   : [fixed-localhost_8848] [notify-context] dataId=redis-keeper-demo.yaml, group=DEFAULT_GROUP, md5=dddd513021564c6d6322e18783ac4f2b
14. 2024-03-12T11:43:51.915+08:00  INFO 62914 --- [ternal.notifier] c.a.c.n.c.NacosConfigDataLoader          : [Nacos Config] Load config[dataId=redis-keeper-demo.yaml, group=DEFAULT_GROUP] success
15. 2024-03-12T11:43:51.950+08:00  INFO 62914 --- [ternal.notifier] o.s.c.e.event.RefreshEventListener       : Refresh keys changed: [redis-keeper.redis.datasource.ds1.database]
16. 2024-03-12T11:43:51.950+08:00  INFO 62914 --- [ternal.notifier] c.a.nacos.client.config.impl.CacheData   : [fixed-localhost_8848] [notify-ok] dataId=redis-keeper-demo.yaml, group=DEFAULT_GROUP, md5=dddd513021564c6d6322e18783ac4f2b, listener=com.alibaba.cloud.nacos.refresh.NacosContextRefresher$1@178412d1 ,cost=249 millis.

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再次访问上面的方法，日记打印如下（可以看到写入的redis库是0库）：

1. 2024-03-12T11:46:11.849+08:00  INFO 62914 --- [nio-8000-exec-4] o.c.r.k.support.DefaultRedissonTemplate  : cmd:set, params:[foo, bar], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=0}]
2. 2024-03-12T11:46:11.861+08:00  INFO 62914 --- [nio-8000-exec-4] o.c.r.k.support.DefaultRedissonTemplate  : cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=0}]

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多数据源负载均衡

有的业务场景必要多套redis集群，来承接同一业务的流量，起到分流的作用，这时就必要从多个数据源中获取其中的某一个进行redis的读写。
负载均衡的算法现在支持两种：轮询、随机。
redis多数据源设置，示比方下：
注意：只有 redis-keeper.redis.datasources 大概 redis-keeper.redisson.datasources 设置下的多数据源支持负载均衡。

1. redis-keeper:
2.   redis:
3.     datasources:
4.       ds2:
5.         - host: localhost
6.           port: 6379
7.           database: 1
8.           password: xxx
9.           invoke-params-print: true
11.         - host: localhost
12.           port: 6379
13.           database: 2
14.           password: xxx
15.           invoke-params-print: true
17.         - host: localhost
18.           port: 6379
19.           database: 3
20.           password: xxx
21.           invoke-params-print: true

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轮询示比方下：

1. public class AppTest {
3.     @Autowired
4.     private CacheTemplateProvider<CacheTemplate> provider;
6.     public void testPollTemplate() {
7.         String key = "foo";
9.         for (int i = 1; i <= 10; i++) {
10.             final Optional<CacheTemplate> templateOptional = provider.pollTemplate("ds2");
11.             if (templateOptional.isPresent()) {
12.                 final CacheTemplate template = templateOptional.get();
14.                 final String str = String.valueOf(i);
16.                 template.set(key, str);
18.                 template.get(key).ifPresent(el -> {
19.                     assert str.equals(el);
20.                 });
22.                 template.del(key);
23.             }
24.         }
26.     }
27.    
28. }

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日记打印结果，可以看到设置的redis数据源的出现的次数是相近的：

1. 2024-03-12 12:15:15.614  INFO 67575 --- [main] : cmd:set, params:[foo, 1], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]
2. 2024-03-12 12:15:15.621  INFO 67575 --- [main] : cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]
3. 2024-03-12 12:15:15.624  INFO 67575 --- [main] : cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]
4. 2024-03-12 12:15:15.627  INFO 67575 --- [main] : cmd:set, params:[foo, 2], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
5. 2024-03-12 12:15:15.629  INFO 67575 --- [main] : cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
6. 2024-03-12 12:15:15.635  INFO 67575 --- [main] : cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
7. 2024-03-12 12:15:15.635  INFO 67575 --- [main] : cmd:set, params:[foo, 3], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
8. 2024-03-12 12:15:15.636  INFO 67575 --- [main] : cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
9. 2024-03-12 12:15:15.638  INFO 67575 --- [main] : cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
11. 2024-03-12 12:15:15.639  INFO 67575 --- [main] : cmd:set, params:[foo, 4], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]
12. 2024-03-12 12:15:15.652  INFO 67575 --- [main] : cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]
13. 2024-03-12 12:15:15.653  INFO 67575 --- [main] : cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]
14. 2024-03-12 12:15:15.654  INFO 67575 --- [main] : cmd:set, params:[foo, 5], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
15. 2024-03-12 12:15:15.655  INFO 67575 --- [main] : cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
16. 2024-03-12 12:15:15.656  INFO 67575 --- [main] : cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
17. 2024-03-12 12:15:15.656  INFO 67575 --- [main] : cmd:set, params:[foo, 6], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
18. 2024-03-12 12:15:15.658  INFO 67575 --- [main] : cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
19. 2024-03-12 12:15:15.658  INFO 67575 --- [main] : cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
21. 2024-03-12 12:15:15.659  INFO 67575 --- [main] : cmd:set, params:[foo, 7], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]
22. 2024-03-12 12:15:15.660  INFO 67575 --- [main] : cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]
23. 2024-03-12 12:15:15.661  INFO 67575 --- [main] : cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]
24. 2024-03-12 12:15:15.667  INFO 67575 --- [main] : cmd:set, params:[foo, 8], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
25. 2024-03-12 12:15:15.669  INFO 67575 --- [main] : cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
26. 2024-03-12 12:15:15.669  INFO 67575 --- [main] : cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
27. 2024-03-12 12:15:15.670  INFO 67575 --- [main] : cmd:set, params:[foo, 9], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
28. 2024-03-12 12:15:15.672  INFO 67575 --- [main] : cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
29. 2024-03-12 12:15:15.673  INFO 67575 --- [main] : cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
31. 2024-03-12 12:15:15.674  INFO 67575 --- [main] : cmd:set, params:[foo, 10], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]
32. 2024-03-12 12:15:15.675  INFO 67575 --- [main] : cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]
33. 2024-03-12 12:15:15.676  INFO 67575 --- [main] : cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]

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随机示比方下：

1. public class AppTest {
3.     @Autowired
4.     private CacheTemplateProvider<CacheTemplate> provider;
6.     public void testRandomTemplate() {
7.         String key = "foo";
9.         for (int i = 1; i <= 10; i++) {
10.             final Optional<CacheTemplate> templateOptional = provider.randomTemplate("ds2");
11.             if (templateOptional.isPresent()) {
12.                 final CacheTemplate template = templateOptional.get();
14.                 final String str = String.valueOf(i);
16.                 template.set(key, str);
18.                 template.get(key).ifPresent(el -> {
19.                     assert str.equals(el);
20.                 });
22.                 template.del(key);
23.             }
24.         }
26.     }
27.    
28. }

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日记打印结果，可以看到设置的redis数据源的出现的次数是随机的：

1. 2024-03-12 12:05:06.450  INFO 66199 --- [main]: cmd:set, params:[foo, 1], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
2. 2024-03-12 12:05:06.457  INFO 66199 --- [main]: cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
3. 2024-03-12 12:05:06.461  INFO 66199 --- [main]: cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
5. 2024-03-12 12:05:06.464  INFO 66199 --- [main]: cmd:set, params:[foo, 2], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
6. 2024-03-12 12:05:06.465  INFO 66199 --- [main]: cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
7. 2024-03-12 12:05:06.467  INFO 66199 --- [main]: cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
9. 2024-03-12 12:05:06.468  INFO 66199 --- [main]: cmd:set, params:[foo, 3], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
10. 2024-03-12 12:05:06.469  INFO 66199 --- [main]: cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
11. 2024-03-12 12:05:06.470  INFO 66199 --- [main]: cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
13. 2024-03-12 12:05:06.472  INFO 66199 --- [main]: cmd:set, params:[foo, 4], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
14. 2024-03-12 12:05:06.473  INFO 66199 --- [main]: cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
15. 2024-03-12 12:05:06.475  INFO 66199 --- [main]: cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
17. 2024-03-12 12:05:06.475  INFO 66199 --- [main]: cmd:set, params:[foo, 5], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]
18. 2024-03-12 12:05:06.476  INFO 66199 --- [main]: cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]
19. 2024-03-12 12:05:06.477  INFO 66199 --- [main]: cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=1}]
21. 2024-03-12 12:05:06.478  INFO 66199 --- [main]: cmd:set, params:[foo, 6], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
22. 2024-03-12 12:05:06.479  INFO 66199 --- [main]: cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
23. 2024-03-12 12:05:06.481  INFO 66199 --- [main]: cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
25. 2024-03-12 12:05:06.482  INFO 66199 --- [main]: cmd:set, params:[foo, 7], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
26. 2024-03-12 12:05:06.484  INFO 66199 --- [main]: cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
27. 2024-03-12 12:05:06.485  INFO 66199 --- [main]: cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
29. 2024-03-12 12:05:06.486  INFO 66199 --- [main]: cmd:set, params:[foo, 8], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
30. 2024-03-12 12:05:06.488  INFO 66199 --- [main]: cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
31. 2024-03-12 12:05:06.489  INFO 66199 --- [main]: cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
33. 2024-03-12 12:05:06.491  INFO 66199 --- [main]: cmd:set, params:[foo, 9], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
34. 2024-03-12 12:05:06.492  INFO 66199 --- [main]: cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
35. 2024-03-12 12:05:06.493  INFO 66199 --- [main]: cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=2}]
37. 2024-03-12 12:05:06.494  INFO 66199 --- [main]: cmd:set, params:[foo, 10], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
38. 2024-03-12 12:05:06.495  INFO 66199 --- [main]: cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]
39. 2024-03-12 12:05:06.496  INFO 66199 --- [main]: cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=3}]

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获取指定状态标识的数据源

默认环境下数据源的状态标识是读写，还有三个可配状态标识：只读、只写、跳过。
注意：此处的状态只是一种标识，用于筛选获取指定的数据源，并不用于控制redis的读写下令。
数据源设置如下：

1. redis-keeper:
2.   redis:
3.     datasource:
4.       ds1:
5.         host: localhost
6.         port: 6379
7.         database: 10
8.         password: xxx
9.         status: RW
10.         invoke-params-print: true

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测试方法：

1. public void testTemplateWithStatus() {
2.         final Optional<CacheTemplate> templateOptional = provider.getTemplate("ds1", CacheDatasourceStatus.RW);
4.         if (templateOptional.isPresent()) {
5.             final CacheTemplate cacheTemplate = templateOptional.get();
7.             String key = "foo";
8.             String value = "bar";
9.             cacheTemplate.set(key, value);
11.             final Optional<Object> optional = cacheTemplate.get(key);
13.             optional.ifPresent(el -> {
14.                 assert value.equals(el);
15.             });
17.             cacheTemplate.del(key);
19.         }
21.         assert !provider.getTemplate("ds1", CacheDatasourceStatus.SKIP).isPresent();
23.     }

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访问上面的方法，日记打印如下：

1. 2024-03-12 14:28:34.183  INFO 77230 --- [main]: cmd:set, params:[foo, bar], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=0}]
2. 2024-03-12 14:28:34.190  INFO 77230 --- [main]: cmd:get, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=0}]
3. 2024-03-12 14:28:34.193  INFO 77230 --- [main]: cmd:del, params:[foo], connectionInfo:[SingleServer:{Address=redis://localhost:6379,Database=0}]

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更多详细示例，请查看：https://github.com/codebaorg/redis-keeper/blob/main/README_zh.md
对比其他方案

• https://cloud.tencent.com/developer/article/2195679
  
• https://juejin.cn/post/7012164339255738399
  
• https://www.cnblogs.com/Zzzyyw/p/17116721.html
  
• https://learnku.com/articles/37188
  
• https://iogogogo.github.io/2020/01/10/spring-boot-redis-multi-instance/
  

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