MessageConst.java

/**
 * Copyright (C) 2010-2013 Alibaba Group Holding Limited
 *
 * 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.alibaba.rocketmq.common.message;

public class MessageConst {
    /**
     * 消息关键词，多个Key用KEY_SEPARATOR隔开（查询消息使用）
     */
    public static final String PROPERTY_KEYS = "KEYS";
    /**
     * 消息标签，只支持设置一个Tag（服务端消息过滤使用）
     */
    public static final String PROPERTY_TAGS = "TAGS";
    /**
     * 是否等待服务器将消息存储完毕再返回（可能是等待刷盘完成或者等待同步复制到其他服务器）
     */
    public static final String PROPERTY_WAIT_STORE_MSG_OK = "WAIT";
    /**
     * 消息延时投递时间级别，0表示不延时，大于0表示特定延时级别（具体级别在服务器端定义）
     */
    public static final String PROPERTY_DELAY_TIME_LEVEL = "DELAY";

    /**
     * 内部使用
     */
    public static final String PROPERTY_RETRY_TOPIC = "RETRY_TOPIC";
    public static final String PROPERTY_REAL_TOPIC = "REAL_TOPIC";
    public static final String PROPERTY_REAL_QUEUE_ID = "REAL_QID";
    public static final String PROPERTY_TRANSACTION_PREPARED = "TRAN_MSG";
    public static final String PROPERTY_PRODUCER_GROUP = "PGROUP";
    public static final String PROPERTY_MIN_OFFSET = "MIN_OFFSET";
    public static final String PROPERTY_MAX_OFFSET = "MAX_OFFSET";

    public static final String KEY_SEPARATOR = " ";
}