com.lambdaworks.redis.output.KeyValueScanStreamingOutput Maven / Gradle / Ivy

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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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/*
 * Copyright 2011-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.lambdaworks.redis.output;

import java.nio.ByteBuffer;

import com.lambdaworks.redis.StreamScanCursor;
import com.lambdaworks.redis.codec.RedisCodec;

/**
 * Streaming-Output of Key Value Pairs. Returns the count of all Key-Value pairs (including null).
 * 
 * @param  Key type.
 * @param  Value type.
 * 
 * @author Mark Paluch
 */
public class KeyValueScanStreamingOutput extends ScanOutput {

    private K key;
    private KeyValueStreamingChannel channel;

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

    @Override
    protected void setOutput(ByteBuffer bytes) {

        if (key == null) {
            key = codec.decodeKey(bytes);
            return;
        }

        V value = (bytes == null) ? null : codec.decodeValue(bytes);

        channel.onKeyValue(key, value);
        output.setCount(output.getCount() + 1);
        key = null;
    }

}