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Redis Replicator implement Redis Replication protocol written in java. It can parse,filter,broadcast the RDB and AOF events in a real time manner. It also can synchronize redis data to your local cache or to database.
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/*
 * Copyright 2016-2018 Leon Chen
 *
 * 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.moilioncircle.redis.replicator;

/**
 * @author Leon Chen
 * @since 2.1.0
 */
public class Constants {

    private Constants() {
    }

    public static final char[] MODULE_SET = new char[]{
            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '_'
    };
    
    /**
     * len type
     */
    public static final int RDB_ENCVAL = 3;
    public static final int RDB_6BITLEN = 0;
    public static final int RDB_14BITLEN = 1;
    public static final int RDB_32BITLEN = 0x80;
    public static final int RDB_64BITLEN = 0x81;

    /**
     * string type
     */
    public static final int RDB_LOAD_NONE = 0;
    public static final int RDB_LOAD_ENC = 1 << 0;
    public static final int RDB_LOAD_PLAIN = 1 << 1;

    /**
     * string encoding
     */
    public static final int RDB_ENC_INT8 = 0;
    public static final int RDB_ENC_INT16 = 1;
    public static final int RDB_ENC_INT32 = 2;
    public static final int RDB_ENC_LZF = 3;

    /**
     * rdb protocol
     */
    public static final int RDB_OPCODE_MODULE_AUX = 247;
    public static final int RDB_OPCODE_IDLE = 248;
    public static final int RDB_OPCODE_FREQ = 249;
    public static final int RDB_OPCODE_AUX = 250;
    public static final int RDB_OPCODE_RESIZEDB = 251;
    public static final int RDB_OPCODE_EXPIRETIME_MS = 252;
    public static final int RDB_OPCODE_EXPIRETIME = 253;
    public static final int RDB_OPCODE_SELECTDB = 254;
    public static final int RDB_OPCODE_EOF = 255;

    /**
     * rdb object encoding
     */
    public static final int RDB_TYPE_STRING = 0;
    public static final int RDB_TYPE_LIST = 1;
    public static final int RDB_TYPE_SET = 2;
    public static final int RDB_TYPE_ZSET = 3;
    public static final int RDB_TYPE_HASH = 4;
    public static final int RDB_TYPE_ZSET_2 = 5;
    public static final int RDB_TYPE_MODULE = 6;
    public static final int RDB_TYPE_MODULE_2 = 7;
    public static final int RDB_TYPE_HASH_ZIPMAP = 9;
    public static final int RDB_TYPE_LIST_ZIPLIST = 10;
    public static final int RDB_TYPE_SET_INTSET = 11;
    public static final int RDB_TYPE_ZSET_ZIPLIST = 12;
    public static final int RDB_TYPE_HASH_ZIPLIST = 13;
    public static final int RDB_TYPE_LIST_QUICKLIST = 14;
    public static final int RDB_TYPE_STREAM_LISTPACKS = 15;

    /**
     * Module serialized values sub opcodes
     */
    public static final int RDB_MODULE_OPCODE_EOF = 0; /* End of module value. */
    public static final int RDB_MODULE_OPCODE_SINT = 1; /* Signed integer. */
    public static final int RDB_MODULE_OPCODE_UINT = 2; /* Unsigned integer. */
    public static final int RDB_MODULE_OPCODE_FLOAT = 3; /* Float. */
    public static final int RDB_MODULE_OPCODE_DOUBLE = 4; /* Double. */
    public static final int RDB_MODULE_OPCODE_STRING = 5; /* String. */

    /**
     * zip entry
     */
    public static final int ZIP_INT_8B = 0xFE; /*11111110*/
    public static final int ZIP_INT_16B = 0xC0 | 0 << 4; /* 11000000*/
    public static final int ZIP_INT_24B = 0xC0 | 3 << 4; /* 11110000*/
    public static final int ZIP_INT_32B = 0xC0 | 1 << 4; /* 11010000*/
    public static final int ZIP_INT_64B = 0xC0 | 2 << 4; /* 11100000*/
    
    /**
     * list pack
     */
    public static final int STREAM_ITEM_FLAG_NONE = 0; /* No special flags. */
    public static final int STREAM_ITEM_FLAG_DELETED = (1 << 0); /* Entry was deleted. Skip it. */
    public static final int STREAM_ITEM_FLAG_SAMEFIELDS = (1 << 1); /* Same fields as master entry. */

    /**
     * transfer protocol
     */
    public static final byte DOLLAR = '$';
    public static final byte STAR = '*';
    public static final byte PLUS = '+';
    public static final byte MINUS = '-';
    public static final byte COLON = ':';

}