设计模式 外观模式 门面模式

结构性模式-外观模式

门面模式

适用场景：如果你需要一个指向复杂子系统的直接接口， 且该接口的功能有限， 则可以使用外观模式。

不用关心后面的查询具体操作

/**
 * 聚合查询接口
 */
@RestController
@RequestMapping("/search")
@Slf4j
public class SearchController {

    @Resource
    private SearchFacade searchFacade;

    @PostMapping("/all")
    public BaseResponse<SearchVo> searchAll(@RequestBody SearchQueryRequest searchQueryRequest, HttpServletRequest httpServletRequest) {
        SearchVo searchVo = searchFacade.searchAll(searchQueryRequest, httpServletRequest);
        return ResultUtils.success(searchVo);
    }
}

复杂查询逻辑放在SearchFacade里面

package com.xiaofei.site.search.controller;

import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.xiaofei.site.search.common.BaseResponse;
import com.xiaofei.site.search.common.ResultUtils;
import com.xiaofei.site.search.model.dto.image.ImageQueryRequest;
import com.xiaofei.site.search.model.dto.post.PostQueryRequest;
import com.xiaofei.site.search.model.dto.search.SearchQueryRequest;
import com.xiaofei.site.search.model.dto.user.UserQueryRequest;
import com.xiaofei.site.search.model.entity.Image;
import com.xiaofei.site.search.model.enums.SearchTypeEnum;
import com.xiaofei.site.search.model.vo.PostVO;
import com.xiaofei.site.search.model.vo.SearchVo;
import com.xiaofei.site.search.model.vo.UserVO;
import com.xiaofei.site.search.service.ImageService;
import com.xiaofei.site.search.service.PostService;
import com.xiaofei.site.search.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestBody;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;

/**
 * @author tuaofei
 * @description 查询-门面模式
 * @date 2024/11/29
 */
@Component
@Slf4j
public class SearchFacade {

    @Resource
    private PostService postService;

    @Resource
    private UserService userService;

    @Resource
    private ImageService imageService;

    @Resource
    ThreadPoolTaskExecutor threadPoolTaskExecutor;

    public SearchVo searchAll(@RequestBody SearchQueryRequest searchQueryRequest, HttpServletRequest httpServletRequest) {
        SearchVo searchVo = new SearchVo();
        if (searchQueryRequest == null) {
            return searchVo;
        }
        String searchText = searchQueryRequest.getSearchText();
        String searchType = searchQueryRequest.getSearchType();
        if (StringUtils.isBlank(searchType)) {
            CompletableFuture<Page<PostVO>> postTask = CompletableFuture.supplyAsync(() -> {
                PostQueryRequest postQueryRequest = new PostQueryRequest();
                postQueryRequest.setSearchText(searchText);
                Page<PostVO> postVOPage = postService.listPostVoPage(postQueryRequest, httpServletRequest);
                return postVOPage;
            }, threadPoolTaskExecutor);

            CompletableFuture<Page<UserVO>> userTask = CompletableFuture.supplyAsync(() -> {
                UserQueryRequest userQueryRequest = new UserQueryRequest();
                userQueryRequest.setUserName(searchText);
                Page<UserVO> userVOPage = userService.listUserVoPage(userQueryRequest);
                return userVOPage;
            }, threadPoolTaskExecutor);

            CompletableFuture<Page<Image>> imageTask = CompletableFuture.supplyAsync(() -> {
                ImageQueryRequest imageQueryRequest = new ImageQueryRequest();
                imageQueryRequest.setSearchText(searchText);
                Page<Image> imagePage = imageService.getImageByPage(imageQueryRequest);
                return imagePage;
            }, threadPoolTaskExecutor);

            CompletableFuture.allOf(postTask, userTask, imageTask);

            try {
                Page<PostVO> postVOPage = postTask.get();
                searchVo.setPostList(postVOPage.getRecords());
                Page<UserVO> userVOPage = userTask.get();
                searchVo.setUserList(userVOPage.getRecords());
                Page<Image> imagePage = imageTask.get();
                searchVo.setImageList(imagePage.getRecords());
            } catch (InterruptedException | ExecutionException e) {
                e.printStackTrace();
            }
        } else {
            SearchTypeEnum searchTypeEnum = SearchTypeEnum.getEnumByValue(searchType);
            switch (searchTypeEnum) {
                case POST:
                    PostQueryRequest postQueryRequest = new PostQueryRequest();
                    postQueryRequest.setSearchText(searchText);
                    Page<PostVO> postVOPage = postService.listPostVoPage(postQueryRequest, httpServletRequest);
                    searchVo.setPostList(postVOPage.getRecords());
                    break;
                case USER:
                    UserQueryRequest userQueryRequest = new UserQueryRequest();
                    userQueryRequest.setUserName(searchText);
                    Page<UserVO> userVOPage = userService.listUserVoPage(userQueryRequest);
                    searchVo.setUserList(userVOPage.getRecords());
                    break;
                case IMAGE:
                    ImageQueryRequest imageQueryRequest = new ImageQueryRequest();
                    imageQueryRequest.setSearchText(searchText);
                    Page<Image> imagePage = imageService.getImageByPage(imageQueryRequest);
                    searchVo.setImageList(imagePage.getRecords());
                    break;
                default:
                    break;
            }
        }
        return searchVo;
    }
}

原文地址：https://blog.csdn.net/qq_41666142/article/details/144145738

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