### Basic J2Cache Usage Example

Source: https://github.com/oschina/j2cache/blob/master/README.md

Demonstrates basic cache operations: setting a value, retrieving it, and evicting it. Ensure cache.close() is called upon program exit.

```java
public static void main(String[] args) {
    CacheChannel cache = J2Cache.getChannel();
    
    //缓存操作
    cache.set("default", "1", "Hello J2Cache");
    System.out.println(cache.get("default", "1"));
    cache.evict("default", "1");
    System.out.println(cache.get("default", "1"));
    
    cache.close();
}
```

--------------------------------

### Cache Null Object with Loader

Source: https://github.com/oschina/j2cache/blob/master/CHANGES.md

Example of using the get method with a loader to cache null objects. This ensures that even if the loader returns null, it is cached, preventing repeated calls to the loader for the same key.

```java
CacheChannel cache = J2Cache.getChannel();
CacheObject obj = cache.get("Users", "13", () -> "Hello J2Cache");
System.out.println(obj);
//[Users,13,L3]=>Hello J2Cache
```

--------------------------------

### Configure Hostname Resolution in hosts file

Source: https://github.com/oschina/j2cache/blob/master/README.md

If J2Cache initialization is slow when connecting to local Redis, ensure your system's hosts file maps the machine name to the correct IP address. This example shows a typical configuration.

```text
127.0.0.1       localhost
127.0.0.1       winter-notebook.local
::1             localhost
::1             winter-notebook.local
```

--------------------------------

### Dynamically Build J2Cache Instance

Source: https://github.com/oschina/j2cache/blob/master/README.md

Shows how to programmatically create and configure a J2Cache instance using J2CacheConfig and J2CacheBuilder.

```java
J2CacheConfig config = new J2CacheConfig();
//填充 config 变量所需的配置信息
J2CacheBuilder builder = J2CacheBuilder.init(config);
CacheChannel channel = builder.getChannel();
//进行缓存的操作
channel.close();
```

--------------------------------

### Direct Access to Redis Client

Source: https://github.com/oschina/j2cache/blob/master/CHANGES.md

Demonstrates how to obtain a direct reference to the underlying Redis client for advanced operations. Ensure proper resource management by releasing the client after use.

```java
CacheChannel channel = J2Cache.getChannel();
RedisClient client = ((RedisCacheProvider)channel.getL2Provider()).getRedisClient();
try {
    client.get().xxxxx(...);
} finally {
    client.release();
}
```

--------------------------------

### Add Ehcache 3.x for Level 1 Cache

Source: https://github.com/oschina/j2cache/blob/master/README.md

Include this dependency to integrate Ehcache version 3.x as the Level 1 cache provider for J2Cache. Configure ehcache3.xml and place it in the classpath.

```xml
<dependency><!-- Ehcache 3.x //-->
		<groupId>org.ehcache</groupId>
		<artifactId>ehcache</artifactId>
		<version>3.4.0</version>
	</dependency>
```

--------------------------------

### Add RocketMQ Client for Messaging

Source: https://github.com/oschina/j2cache/blob/master/README.md

Include this dependency to enable RocketMQ for message notifications within J2Cache. Configure RocketMQ properties in j2cache.properties. The scope is set to 'provided'.

```xml
<dependency>
		<groupId>org.apache.rocketmq</groupId>
		<artifactId>rocketmq-client</artifactId>
		<version>4.3.0</version>
		<scope>provided</scope>
	</dependency>
```

--------------------------------

### Add Ehcache 2.x for Level 1 Cache

Source: https://github.com/oschina/j2cache/blob/master/README.md

Add this dependency to use Ehcache version 2.x as the Level 1 cache provider for J2Cache. Ensure ehcache.xml is configured and placed in the classpath.

```xml
<dependency><!-- Ehcache 2.x //-->
		<groupId>net.sf.ehcache</groupId>
		<artifactId>ehcache</artifactId>
		<version>2.10.4</version>
	</dependency>
```

--------------------------------

### Add RabbitMQ Client for Messaging

Source: https://github.com/oschina/j2cache/blob/master/README.md

Add this dependency to use RabbitMQ for message notifications in J2Cache. Configure RabbitMQ connection details in j2cache.properties.

```xml
<dependency>
		<groupId>com.rabbitmq</groupId>
		<artifactId>amqp-client</artifactId>
		<version>5.3.0</version>
	</dependency>
```

--------------------------------

### Spring Cache Configuration with J2Cache

Source: https://github.com/oschina/j2cache/blob/master/modules/springcache/j2cache-springcache.md

This Java configuration class enables Spring Caching and sets up J2Cache as the CacheManager. It initializes J2Cache using a properties file and creates an adapter for Spring.

```java
/**
 * @author Chen
 */
@Configuration
@EnableCaching
public class MyCacheConfig extends CachingConfigurerSupport {
    @Override
    public CacheManager cacheManager() {
        // 引入配置
        J2CacheConfig config = J2CacheConfig.initFromConfig("/j2cache.properties");
        // 生成 J2CacheBuilder
        J2CacheBuilder j2CacheBuilder = J2CacheBuilder.init(config);
        // 构建适配器
        J2CacheSpringCacheManageAdapter j2CacheSpringCacheManageAdapter = new J2CacheSpringCacheManageAdapter(j2CacheBuilder, true);

        return j2CacheSpringCacheManageAdapter;
    }
}
```

--------------------------------

### Add JGroups for Group Communication

Source: https://github.com/oschina/j2cache/blob/master/README.md

Include this dependency to enable JGroups for broadcast communication in J2Cache. This is useful in cluster environments where direct multicast might not be feasible.

```xml
<dependency>
		<groupId>org.jgroups</groupId>
		<artifactId>jgroups</artifactId>
		<version>3.6.13.Final</version>
	</dependency>
```

--------------------------------

### Add xmemcached for Memcached Level 2 Cache

Source: https://github.com/oschina/j2cache/blob/master/README.md

Add this dependency to configure Memcached as the Level 2 cache provider for J2Cache. Set 'j2cache.L2.provider_class' to 'memcached' and configure connection details in j2cache.properties.

```xml
<dependency>
		<groupId>com.googlecode.xmemcached</groupId>
		<artifactId>xmemcached</artifactId>
		<version>2.4.5</version>
	</dependency>
```

--------------------------------

### Enable Read-Only Redis Mode

Source: https://github.com/oschina/j2cache/blob/master/CHANGES.md

Configure J2Cache to use Redis in a read-only mode. This is useful for scenarios where write operations to Redis are not desired or possible.

```properties
j2cache.L2.provider_class = readonly-redis
j2cache.L2.config_section = redis
```

--------------------------------

### J2Cache Maven Dependency

Source: https://github.com/oschina/j2cache/blob/master/README_EN.md

Add the J2Cache core dependency to your Maven project to integrate the caching framework.

```xml
<dependency>
  <groupId>net.oschina.j2cache</groupId>
  <artifactId>j2cache-core</artifactId>
  <version>xxxxx</version>
</dependency>
```

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