YamlShardingDataSource.java

/*
 * Copyright 1999-2015 dangdang.com.
 * <p>
 * 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.
 * </p>
 */

package com.dangdang.ddframe.rdb.sharding.config.yaml.api;

import com.dangdang.ddframe.rdb.sharding.config.common.api.ShardingRuleBuilder;
import com.dangdang.ddframe.rdb.sharding.config.yaml.internel.YamlConfig;
import com.dangdang.ddframe.rdb.sharding.jdbc.ShardingDataSource;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.Constructor;

import javax.sql.DataSource;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Map;

/**
 * 基于配置文件的分片规则.
 *
 * @author gaohongtao
 */
public class YamlShardingDataSource extends ShardingDataSource {
    
    public YamlShardingDataSource(final File yamlFile) throws IOException {
        super(new ShardingRuleBuilder(yamlFile.getName(), unmarshal(yamlFile)).build(), unmarshal(yamlFile).getProps());
    }
    
    public YamlShardingDataSource(final Map<String, DataSource> dataSource, final File yamlFile) throws IOException {
        super(new ShardingRuleBuilder(yamlFile.getName(), dataSource, unmarshal(yamlFile)).build(), unmarshal(yamlFile).getProps());
    }
    
    private static YamlConfig unmarshal(final File yamlFile) throws IOException {
        try (
                FileInputStream fileInputStream = new FileInputStream(yamlFile);
                InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "UTF-8")
            ) {
            return new Yaml(new Constructor(YamlConfig.class)).loadAs(inputStreamReader, YamlConfig.class);
        }
    }
}