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The RateLimitJ project aims to provide a modular rate limiting solution

There is a newer version: 0.7.0

package es.moki.ratelimitj.redis.time;


import com.lambdaworks.redis.api.StatefulRedisConnection;
import es.moki.ratelimitj.core.time.TimeSupplier;

import javax.annotation.concurrent.ThreadSafe;
import java.util.concurrent.CompletionStage;

import static java.util.Objects.requireNonNull;

/**
 * A Redis based time supplier.
 * 
 * It may be desirable to use a Redis based time supplier if the software is running on a group of servers with
 * different clocks or unreliable clocks. A disadvantage of the Redis based time supplier is that it introduces
 * an additional network round trip.
 */
@ThreadSafe
public class RedisTimeSupplier implements TimeSupplier {

    private final StatefulRedisConnection connection;

    public RedisTimeSupplier(StatefulRedisConnection connection) {
        this.connection = requireNonNull(connection);
    }

    @Override
    public CompletionStage getAsync() {
        return connection.async().time().thenApply(strings -> Long.parseLong(strings.get(0)));
    }

    @Override
    public long get() {
        return Long.parseLong(connection.sync().time().get(0));
    }
}