content: /*
   * Copyright 2025 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
   *
   *      https://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.cloud.ai.studio.core.base.mq;
  
  import lombok.AllArgsConstructor;
  import lombok.Builder;
  import lombok.Data;
  import lombok.NoArgsConstructor;
  import org.jetbrains.annotations.NotNull;
  
  import java.io.Serializable;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /**
   * A generic message class for message queue operations. Supports different message types
   * and properties.
   *
   * @since 1.0.0.3
   */
  @Data
  @Builder
  @AllArgsConstructor
  @NoArgsConstructor
  public class MqMessage implements Serializable {
  
  	/** Unique identifier for the message */
  	private String messageId;
  
  	/** Topic to which the message belongs */
  	@NotNull
  	private String topic;
  
  	/** Message tag for categorization */
  	@NotNull
  	private String tag;
  
  	/** List of message keys for identification */
  	private List<String> keys;
  
  	/** Actual content of the message */
  	private String body;
  
  	/** Additional properties associated with the message */
  	private Map<String, String> properties = new HashMap<>();
  
  	/** Timestamp when the message was delivered */
  	private Long deliveryTimestamp;
  
  	/**
  	 * Adds a property to the message
  	 * @param key property key
  	 * @param value property value
  	 * @return this message instance
  	 */
  	public MqMessage addProperty(String key, String value) {
  		this.properties.put(key, value);
  		return this;
  	}
  
  	/**
  	 * Retrieves a property value by its key
  	 * @param key property key
  	 * @return property value
  	 */
  	public String getProperty(String key) {
  		return this.properties.get(key);
  	}
  
  }
  