/**
* NOTE
: This file has been copied
and slightly modified from {
com.alibaba
.csp
.sentinel
.datasource
.redis}
.
* <p>
* <h2>Redis Datasource Task Elements Operation</h2>
*
* This class is a concrete implementation of a remote configuration data source,
* b
uilt on top of Redis's high-perform
ance read/write capabilities
and Pub/Sub real-time
* messaging mech
anism
. It enables dynamic loading, listening,
and publishing of rule or
* configuration data with low latency
and strong consistency
.
*
* <p>The primary design objectives are
:</p>
*
* <ul>
* <li><b>Real-time Updates</b>
: Subscribes to a designated Redis Pub/Sub ch
annel to detect
* configuration ch
anges immediately
and trigger hot-reload events
.</li>
* <li><b>Deployment Flexibility</b>
: Supports multiple Redis deployment modes including
* st
andalone, Sentinel (for high availability),
and Redis Cluster (for horizontal scaling)
.</li>
* <li><b>Security Support</b>
: Provides full SSL/TLS encryption support with
compatibility for
* both JKS
and PEM certificate formats, meeting production security req
uirements
.</li>
* <li><b>Extensibility</b>
: Extends {@link RemoteDatasourceTaskElementsOperation}, adhering to a unified
* datasource abstraction contract
. C
an be seamlessly integrated into systems req
uiring
* runtime reconfiguration, such as rule engines, policy m
anagers, or distributed gateways
.</li>
* </ul>
*
* <h3>Working Principle</h3>
* <p>
During initialization, the class automatically selects the appropriate client
based on
* the provided {@link RedisConnectionConfig}
:
* <ul>
* <li>If cluster nodes are configured, it creates a {@link RedisClusterClient}
.</li>
* <li>Otherwise, it uses a {@link RedisClient} for st
andalone or Sentinel mode connections
.</li>
* </ul>
*
* Additionally, it sets up a "lazy-loaded" subscription via {@link #setLazyListener(
java.util
.function.Supplier)} —
* me
aning the actual Pub/Sub connection
and subscription occur only when
an external system
* explicitly requests listening (e
.g
.,
during startup of a configuration watcher)
.
* This lazy initialization strategy reduces resource consumption
and improves application startup time
.
*
* <h3>Key Method Overview</h3>
* <table border="1" cell-padding="8">
* <tr><th>Method</th><th>Purpose</th></tr>
* <tr>
* <td>{@link #getRemoteConfigInfo()}</td>
* <td>Retrieves the current configuration value associated with {@code ruleKey} from Redis (via GET)</td>
* </tr>
* <tr>
* <td>{@link #publishConfig(String)}</td>
* <td>Publishes new configuration data to Redis (via SET), typically used to broadcast updates</td>
* </tr>
* <tr>
* <td>{@link #subscribeFromCh
annel(String)}</td>
* <td>Establishes a Pub/Sub connection
and subscribes to a specific ch
annel; in
coming messages
* are dispatched through {@link DelegatingRedisPubSubListener}</td>
* </tr>
* <tr>
* <td>{@link #close()}</td>
* <td>Gracefully shuts down the Redis client
and releases all underlying resources</td>
* </tr>
* </table>
*
* <h3>Typical Use Cases</h3>
* <ul>
* <li>Dynamic rule loading in rule engines (e
.g
., Drools, Easy Rules)</li>
* <li>Hot-reloading of distributed configurations in microservices</li>
* <li>Real-time policy or permission updates in access control systems</li>
* <li>Centralized rate-limiting or circ
uit-breaker configuration m
anagement</li>
* </ul>
* <h3>Example Usage</h3>
* <pre>{@code
* RedisConnectionConfig config = new RedisConnectionConfig();
* config
.setHost("localhost");
* config
.setPort(6379);
* config
.setTimeout(5000);
*
* RedisDatasourceTaskElementsOperation redisSource =
* new RedisDatasourceTaskElementsOperation(config, "rule
:flow", "ch
annel
:rule-update", ConfigFormat
.JSON);
*
* // Retrieve current configuration
* String currentConfig = redisSource
.getRemoteConfigInfo();
*
* // Start listening (triggers lazy subscription)
* redisSource
.startListen();
*
* // Publish new config (other inst
ances will receive notification)
* redisSource
.publishConfig("{\"rateLimit\"
: 1000}");
*
* // Cle
an up resources
* redisSource
.close();
* }</pre>
*
* @author <a href="mailto
:929160069@qq
.com">zh
angpengfei</a>
* @since 3
.0
.2
*/
编译报错
[
ERROR] /Users/zh
angpengfei/workspace/assembly/assembly-simplified-cron/cron-redis-datasource-driven-scheduled/src/main/
java/top/osjf/cron/datasource/driven/scheduled/redis/RedisDatasourceTaskElementsOperation
.java:97
: 错误
: 此处不允许使用标记
: <tr>
[
ERROR] * <tr>
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