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    • io.netty.handler.codec.redis.RedisArrayAggregator Maven / Gradle / Ivy

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    This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

    There is a newer version: 35.0.0.Beta1
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    /*
 * Copyright 2016 The Netty Project
 *
 * The Netty Project licenses this file to you 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 io.netty.handler.codec.redis;

import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.CodecException;
import io.netty.handler.codec.MessageToMessageDecoder;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.internal.UnstableApi;

import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Deque;
import java.util.List;

/**
 * Aggregates {@link RedisMessage} parts into {@link ArrayRedisMessage}. This decoder
 * should be used together with {@link RedisDecoder}.
 */
@UnstableApi
public final class RedisArrayAggregator extends MessageToMessageDecoder {

    private final Deque depths = new ArrayDeque(4);

    @Override
    protected void decode(ChannelHandlerContext ctx, RedisMessage msg, List out) throws Exception {
        if (msg instanceof ArrayHeaderRedisMessage) {
            msg = decodeRedisArrayHeader((ArrayHeaderRedisMessage) msg);
            if (msg == null) {
                return;
            }
        } else {
            ReferenceCountUtil.retain(msg);
        }

        while (!depths.isEmpty()) {
            AggregateState current = depths.peek();
            current.children.add(msg);

            // if current aggregation completed, go to parent aggregation.
            if (current.children.size() == current.length) {
                msg = new ArrayRedisMessage(current.children);
                depths.pop();
            } else {
                // not aggregated yet. try next time.
                return;
            }
        }

        out.add(msg);
    }

    private RedisMessage decodeRedisArrayHeader(ArrayHeaderRedisMessage header) {
        if (header.isNull()) {
            return ArrayRedisMessage.NULL_INSTANCE;
        } else if (header.length() == 0L) {
            return ArrayRedisMessage.EMPTY_INSTANCE;
        } else if (header.length() > 0L) {
            // Currently, this codec doesn't support `long` length for arrays because Java's List.size() is int.
            if (header.length() > Integer.MAX_VALUE) {
                throw new CodecException("this codec doesn't support longer length than " + Integer.MAX_VALUE);
            }

            // start aggregating array
            depths.push(new AggregateState((int) header.length()));
            return null;
        } else {
            throw new CodecException("bad length: " + header.length());
        }
    }

    private static final class AggregateState {
        private final int length;
        private final List children;
        AggregateState(int length) {
            this.length = length;
            this.children = new ArrayList(length);
        }
    }
}
    
    
    
    

    




    
    
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