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/*
 * Copyright (c) 2013-2024 Hutool Team and hutool.cn
 *
 * 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 org.dromara.hutool.db.ds;

import org.dromara.hutool.core.io.IoUtil;
import org.dromara.hutool.core.lang.Singleton;
import org.dromara.hutool.core.map.MapUtil;
import org.dromara.hutool.core.map.concurrent.SafeConcurrentHashMap;
import org.dromara.hutool.core.text.StrUtil;
import org.dromara.hutool.db.config.ConfigParser;
import org.dromara.hutool.db.config.DbConfig;
import org.dromara.hutool.db.config.SettingConfigParser;
import org.dromara.hutool.log.LogUtil;

import java.io.Closeable;
import java.util.Collection;
import java.util.Map;

/**
 * 数据源池,用于支持多数据源。
* 在指定Setting中配置多个数据源时,通过分组(group)区分
* 每次获得一个数据源则缓存在pool中,确保数据源保持单例状态。 * * @author Looly * @since 6.0.0 */ public class DSPool implements Closeable { /** * 获取单例池对象 * * @return 数据源池 */ public static DSPool getInstance() { return Singleton.get(DSPool.class.getName(), DSPool::new); } private final ConfigParser configParser; /** * 数据源池 */ private final Map pool; /** * 连接工厂 */ private DSFactory factory; /** * 构造,通过SPI方式自动获取用户引入的连接池,使用classpath:db.setting */ public DSPool() { this(null); } /** * 构造,通过SPI方式自动获取用户引入的连接池 * * @param configParser 数据库配置解析器 */ public DSPool(final ConfigParser configParser) { this(configParser, null); } /** * 构造 * * @param configParser 数据库配置解析器 * @param factory 数据源工厂,用于创建数据源,{@code null}表示使用SPI自动获取 */ public DSPool(final ConfigParser configParser, final DSFactory factory) { this.configParser = null != configParser ? configParser : SettingConfigParser.of(); this.factory = null != factory ? factory : DSUtil.getDefaultDsFactory(); this.pool = new SafeConcurrentHashMap<>(); } /** * 获取配置解析器 * * @return ConfigParser */ public ConfigParser getConfigParser() { return this.configParser; } /** * 获取数据源名称,用于识别当前使用连接池类型 * * @return 数据源名称 */ public String getDataSourceName() { return this.factory.getDataSourceName(); } /** * 设置自定义的{@link DSFactory} * * @param factory {@link DSFactory} * @return this */ public DSPool setFactory(final DSFactory factory) { this.factory = factory; LogUtil.debug("Custom use [{}] DataSource.", factory.getDataSourceName()); return this; } /** * 获取指定分组的数据源,单例获取 * * @param group 分组,{@code null}表示默认分组 * @return 数据源 */ public DSWrapper getDataSource(String group) { if (group == null) { group = StrUtil.EMPTY; } // 如果已经存在已有数据源(连接池)直接返回 return pool.computeIfAbsent(group, this::createDSWrapper); } /** * 关闭指定数据源 * * @param group 分组 * @return this */ public DSPool closeDataSource(String group) { if (group == null) { group = StrUtil.EMPTY; } // 此处线程安全,任意线程进入一旦remove完成,后续线程调用remove后都为null final DSWrapper removed = pool.remove(group); if (null != removed) { IoUtil.closeQuietly(removed); } return this; } @Override public void close() { final Map pool = this.pool; if (MapUtil.isNotEmpty(pool)) { // 此处线程安全,多线程调用可能多次调用clear,不影响 final Collection values = pool.values(); pool.clear(); for (final DSWrapper ds : values) { ds.close(); } } } /** * 创建数据源,对于不同连接池名称的的差异做兼容,如用户配置user和username都表示用户名 * * @param group 分组,{@code null}表示默认分组 * @return {@link DSWrapper} 数据源包装 */ private DSWrapper createDSWrapper(final String group) { final DbConfig dbConfig = this.configParser.parse(StrUtil.toStringOrEmpty(group)); return DSWrapper.wrap(factory.createDataSource(dbConfig), dbConfig); } }




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