Flink中和各位大哥请教一下， 自定义redis数据源，定时扫描key，然后供下游使用， 请问下？

在Flink中自定义Redis数据源，可以通过以下步骤实现定时扫描key并供下游使用：

1、创建一个Redis连接池，用于连接Redis数据库。

RedisClient redisClient = RedisClient.create("redis://localhost:6379");  
StatefulRedisConnection<String, String> connection = redisClient.connect();
  
  // 省略其他配置项
}

2、创建一个自定义数据源，并实现createReader()方法。在该方法中，使用StatefulRedisConnection对象连接Redis数据库，并使用Redis命令扫描指定的key。

public class RedisCustomDataSource implements DataSource<String> {  
    private final String keyPattern;  
    private final long startTime;  
    private final long endTime;  
    private final int batchSize;  
    private final long interval;  
    private final int port;  
    private final String password;  
    private final int databaseIndex;  
  
    public RedisCustomDataSource(String keyPattern, long startTime, long endTime, int batchSize, long interval, int port, String password, int databaseIndex) {  
        this.keyPattern = keyPattern;  
        this.startTime = startTime;  
        this.endTime = endTime;  
        this.batchSize = batchSize;  
        this.interval = interval;  
        this.port = port;  
        this.password = password;  
        this.databaseIndex = databaseIndex;  
    }  
  
    @Override  
    public Cancellable schedule(SourceFunction.SourceContext<String> ctx) {  
        return new ScheduledSource(ctx);  
    }  
  
    private class ScheduledSource implements Cancellable {  
        private final SourceFunction.SourceContext<String> ctx;  
        private boolean running = true;  
        private ScheduledFuture<?> exec