com.github.fmjsjx.libnetty.resp.DefaultRespMessageDecoder Maven / Gradle / Ivy

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A set of some useful libraries based on netty4.1.x.

There is a newer version: 3.7.1

package com.github.fmjsjx.libnetty.resp;

import static com.github.fmjsjx.libnetty.resp.RespConstants.*;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.function.BiConsumer;

import io.netty.buffer.ByteBuf;
import io.netty.util.CharsetUtil;

/**
 * The default implementation of {@link RespMessageDecoder}.
 * 
 * @since 1.0
 *
 * @author MJ Fang
 */
public class DefaultRespMessageDecoder extends RespMessageDecoder {

    static final class ArrayBuilder {

        private final int length;
        private final ArrayList values;

        ArrayBuilder(int length) {
            this.length = length;
            this.values = new ArrayList<>(length);
        }

        boolean isReachedEnd() {
            return values.size() == length;
        }

        boolean add(RespMessage msg) {
            values.add(msg);
            return isReachedEnd();
        }

        RespArrayMessage build() {
            return wrappedArray(values);
        }

    }

    private LinkedList nests;
    private int currentBulkStringLength;

    private final BiConsumer> arrayHeaderDecoder = this::decodeArrayHeader;
    private final BiConsumer> bulkStringLengthDecoder = this::decodeBulkStringLength;
    private final BiConsumer> simpleStringDecoder = this::decodeSimpleString;
    private final BiConsumer> errorDecoder = this::decodeError;
    private final BiConsumer> integerDecoder = this::decodeInteger;

    /**
     * Constructs a new {@link DefaultRespMessageDecoder} using default
     * {@code maxInlineMessageLength} ({@code 65536}).
     */
    public DefaultRespMessageDecoder() {
        this(RespConstants.RESP_INLINE_MESSAGE_MAX_LENGTH);
    }

    /**
     * Constructs a new {@link DefaultRespMessageDecoder} using specified
     * {@code maxInlineMessageLength}.
     * 
     * @param maxInlineMessageLength maxInlineMessageLength the maximum length of
     *                               in-line messages
     */
    public DefaultRespMessageDecoder(int maxInlineMessageLength) {
        super(maxInlineMessageLength);
    }

    @Override
    protected void resetDecoder() {
        super.resetDecoder();
        nests = null;
    }

    @Override
    protected boolean decodeInline(ByteBuf in, List