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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 java.util.LinkedHashMap;
import java.util.Map;

import io.lettuce.core.Range;
import io.lettuce.core.codec.RedisCodec;
import io.lettuce.core.codec.StringCodec;
import io.lettuce.core.models.stream.PendingMessages;

/**
 * Decodes {@link PendingMessages}.
 *
 * @param  Key type.
 * @param  Value type.
 * @author Mark Paluch
 * @since 6.0
 */
public class PendingMessagesOutput extends CommandOutput {

    private Long count;

    private String messageIdsFrom;

    private String messageIdsTo;

    private String consumer;

    private boolean hasConsumer;

    private final Map consumerMessageCount = new LinkedHashMap<>();

    public PendingMessagesOutput(RedisCodec codec) {
        super(codec, null);
    }

    @Override
    public void set(ByteBuffer bytes) {

        if (messageIdsFrom == null) {
            messageIdsFrom = decodeAscii(bytes);
            return;
        }

        if (messageIdsTo == null) {
            messageIdsTo = decodeAscii(bytes);
            return;
        }

        if (!hasConsumer) {
            consumer = StringCodec.UTF8.decodeKey(bytes);
            hasConsumer = true;
            return;
        }

        set(Long.parseLong(decodeAscii(bytes)));
    }

    @Override
    public void set(long integer) {

        if (count == null) {
            count = integer;
            return;
        }

        if (hasConsumer) {
            consumerMessageCount.put(consumer, integer);
            consumer = null;
            hasConsumer = false;
        }
    }

    @Override
    public void complete(int depth) {

        if (depth == 0) {

            Range range = messageIdsFrom != null && messageIdsTo != null ? Range.create(messageIdsFrom, messageIdsTo)
                    : Range.unbounded();
            output = new PendingMessages(count == null ? 0 : count, range, consumerMessageCount);
        }
    }

}