BulletinBoardService.java

package org.verwandlung.voj.web.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.verwandlung.voj.web.mapper.BulletinBoardMessageMapper;
import org.verwandlung.voj.web.model.BulletinBoardMessage;

import java.util.List;

/**
 * 布告栏(BulletinBoard)的业务逻辑层.
 * @author Haozhe Xie
 */
@Service
@Transactional
public class BulletinBoardService {
    /**
     * 获取布告栏消息的数量.
     * @return 布告栏消息的数量
     */
    public long getNumberOfBulletinBoardMessages() {
        return bulletinBoardMessageMapper.getNumberOfBulletinBoardMessages();
    }

    /**
     * 获取布告栏消息.
     * @param offset - 布告栏消息唯一标识符的起始编号
     * @param limit - 获取布告栏消息的数量
     * @return 包含布告栏消息的列表
     */
    public List<BulletinBoardMessage> getBulletinBoardMessages(long offset, int limit) {
        return bulletinBoardMessageMapper.getBulletinBoardMessages(offset, limit);
    }

    /**
     * 使用布告栏消息的唯一标识符获取布告栏消息.
     * @param bulletinBoardMessageId - 布告栏消息的唯一标识符
     * @return 特定的布告栏消息
     */
    public BulletinBoardMessage getBulletinBoardMessage(long bulletinBoardMessageId) {
        return bulletinBoardMessageMapper.getBulletinBoardMessageUsingId(bulletinBoardMessageId);
    }

    /**
     * 自动注入的BulletinBoardMessageMapper.
     * 用于获取布告栏消息.
     */
    @Autowired
    private BulletinBoardMessageMapper bulletinBoardMessageMapper;
}