net.duckling.ddl.service.user.impl.UserSortPreferenceServiceImpl.java Source code

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Here is the source code for net.duckling.ddl.service.user.impl.UserSortPreferenceServiceImpl.java

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/*
 * Copyright (c) 2008-2016 Computer Network Information Center (CNIC), Chinese Academy of Sciences.
 * 
 * This file is part of Duckling project.
 *
 * 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 net.duckling.ddl.service.user.impl;

import java.util.Date;

import net.duckling.ddl.service.user.UserSortPreference;
import net.duckling.falcon.api.cache.ICacheService;

import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserSortPreferenceServiceImpl implements UserSortPreferenceService {
    @Autowired
    private UserSortPreferenceDao userSortPreferenceDao;
    @Autowired
    private ICacheService memcachedService;

    @Override
    public String getUidSortPreference(String uid, String userChoiceSort, String useType) {
        if (StringUtils.isEmpty(userChoiceSort)) {
            return getSortOnly(uid, useType);
        } else {
            String r = getSortOnly(uid, useType);
            if (!userChoiceSort.equals(r)) {
                updateUserPreference(uid, userChoiceSort, useType);
            }
            return userChoiceSort;
        }
    }

    private String getSortOnly(String uid, String useType) {
        String result = (String) memcachedService.get(getMemKey(uid, useType));
        if (StringUtils.isNotEmpty(result)) {
            return result;
        } else {
            UserSortPreference user = userSortPreferenceDao.query(uid, useType);
            if (user != null) {
                memcachedService.set(getMemKey(uid, useType), user.getSortType());
                return user.getSortType();
            }
            return null;
        }
    }

    private void updateUserPreference(String uid, String userChoiceSort, String useType) {
        UserSortPreference user = userSortPreferenceDao.query(uid, useType);
        if (user == null) {
            user = new UserSortPreference();
            user.setUid(uid);
            user.setSortType(userChoiceSort);
            user.setType(useType);
            user.setLastModify(new Date());
            userSortPreferenceDao.create(user);
        } else {
            user.setSortType(userChoiceSort);
            user.setLastModify(new Date());
            userSortPreferenceDao.update(user);
        }
        memcachedService.set(getMemKey(uid, useType), user.getSortType());
    }

    private String getMemKey(String uid, String useType) {
        return "user-sort:" + uid + ":type" + useType;
    }

}