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Advanced and thread-safe Java Redis client for synchronous, asynchronous, and reactive usage. Supports Cluster, Sentinel, Pipelining, Auto-Reconnect, Codecs and much more.

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package io.lettuce.core.output;

import java.nio.ByteBuffer;

import io.lettuce.core.StreamScanCursor;
import io.lettuce.core.codec.RedisCodec;

/**
 * Streaming API for multiple Keys. You can implement this interface in order to receive a call to {@code onKey} on every key.
 * Key uniqueness is not guaranteed.
 *
 * @param  Key type.
 * @param  Value type.
 * @author Mark Paluch
 */
public class KeyScanStreamingOutput extends ScanOutput {

    private final KeyStreamingChannel channel;

    public KeyScanStreamingOutput(RedisCodec codec, KeyStreamingChannel channel) {
        super(codec, new StreamScanCursor());
        this.channel = channel;
    }

    @Override
    protected void setOutput(ByteBuffer bytes) {
        channel.onKey(bytes == null ? null : codec.decodeKey(bytes));
        output.setCount(output.getCount() + 1);
    }

}