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YMP Persistence for JDBC.
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/*
 * Copyright 2007-2017 the original author or authors.
 *
 * 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.ymate.platform.persistence.jdbc;

import net.ymate.platform.core.util.ClassUtils;
import net.ymate.platform.core.util.RuntimeUtils;
import net.ymate.platform.persistence.jdbc.dialect.IDialect;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.sql.DriverManager;
import java.sql.SQLException;

/**
 * 抽象数据源适配器
 *
 * @author 刘镇 ([email protected]) on 2013年8月1日 下午8:30:34
 * @version 1.0
 */
public abstract class AbstractDataSourceAdapter implements IDataSourceAdapter {

    private static final Log _LOG = LogFactory.getLog(AbstractDataSourceAdapter.class);

    protected DataSourceCfgMeta __cfgMeta;

    private IDialect __dialect;

    protected boolean __inited;

    @Override
    public void initialize(DataSourceCfgMeta cfgMeta) throws Exception {
        if (!__inited) {
            this.__cfgMeta = cfgMeta;
            //
            if (StringUtils.isNotBlank(cfgMeta.getDialectClass())) {
                __dialect = ClassUtils.impl(__cfgMeta.getDialectClass(), IDialect.class, this.getClass());
            } else {
                __dialect = JDBC.DB_DIALECTS.get(__cfgMeta.getType()).newInstance();
            }
            if (__dialect != null && StringUtils.isNotBlank(__cfgMeta.getIdentifierQuote())) {
                char[] _quotes = __cfgMeta.getIdentifierQuote().toCharArray();
                if (_quotes.length == 1) {
                    __dialect.setIdentifierQuote(__cfgMeta.getIdentifierQuote(), __cfgMeta.getIdentifierQuote());
                } else if (_quotes.length > 1) {
                    __dialect.setIdentifierQuote(Character.toString(_quotes[0]), Character.toString(_quotes[1]));
                }
            }
            //
            __inited = tryInitializeIfNeed();
        }
    }

    @Override
    public boolean tryInitializeIfNeed() throws Exception {
        if (!__inited) {
            try {
                __doInit();
                //
                __inited = true;
            } catch (Exception e) {
                _LOG.warn("Data source '" + __cfgMeta.getName() + "' initialization failed...", RuntimeUtils.unwrapThrow(e));
            }
        }
        return __inited;
    }

    @Override
    public DataSourceCfgMeta getDataSourceCfgMeta() {
        return __cfgMeta;
    }

    protected abstract void __doInit() throws Exception;

    @Override
    public IDialect getDialect() {
        return __dialect;
    }

    @Override
    public void destroy() {
        if (__inited) {
            __inited = false;
            //
            try {
                DriverManager.deregisterDriver(DriverManager.getDriver(__cfgMeta.getConnectionUrl()));
            } catch (SQLException e) {
                _LOG.warn("", e);
            }
            //
            __cfgMeta = null;
            __dialect = null;
        }
    }
}