com.alibaba.wasp.jdbc.Driver.java Source code

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Here is the source code for com.alibaba.wasp.jdbc.Driver.java

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/**
 * Copyright The Apache Software Foundation
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with this
 * work for additional information regarding copyright ownership. The ASF
 * licenses this file to you 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 com.alibaba.wasp.jdbc;

import com.alibaba.wasp.FConstants;
import org.apache.commons.lang.NotImplementedException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.DriverPropertyInfo;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.Properties;
import java.util.logging.Logger;

/**
 * JDBC<com.alibaba.wasp.jdbc.Driver>.Please use
 * code<Class.forName("com.alibaba.wasp.jdbc.Driver");>
 * 
 */
public class Driver implements java.sql.Driver {

    private static Log log = LogFactory.getLog(Driver.class);

    private static final Driver INSTANCE = new Driver();
    private static final String DEFAULT_URL = "jdbc:default:connection";
    private static final ThreadLocal<Connection> DEFAULT_CONNECTION = new ThreadLocal<Connection>();

    private static volatile boolean registered;

    static {
        load();
    }

    /**
     * Open a database connection. This method should not be called by an
     * application. Instead, the method DriverManager.getConnection should be
     * used.
     * 
     * @param url
     *          the database URL
     * @param info
     *          the connection properties
     * @return the new connection or null if the URL is not supported
     */
    public Connection connect(String url, Properties info) throws SQLException {
        try {
            if (info == null) {
                info = new Properties();
            }
            if (!acceptsURL(url)) {
                return null;
            }
            if (url.equals(DEFAULT_URL)) {
                return DEFAULT_CONNECTION.get();
            }
            return new JdbcConnection(url, info);
        } catch (Exception e) {
            throw JdbcException.toSQLException(e);
        }
    }

    /**
     * Check if the driver understands this URL. This method should not be called
     * by an application.
     * 
     * @param url
     *          the database URL
     * @return if the driver understands the URL
     */
    @Override
    public boolean acceptsURL(String url) {
        if (url != null) {
            if (url.startsWith(FConstants.START_URL)) {
                return true;
            } else if (url.equals(DEFAULT_URL)) {
                return DEFAULT_CONNECTION.get() != null;
            }
        }
        return false;
    }

    /**
     * Get the major version number of the driver. This method should not be
     * called by an application.
     * 
     * @return the major version number
     */
    @Override
    public int getMajorVersion() {
        return FConstants.VERSION_MAJOR;
    }

    /**
     * Get the minor version number of the driver. This method should not be
     * called by an application.
     * 
     * @return the minor version number
     */
    @Override
    public int getMinorVersion() {
        return FConstants.VERSION_MINOR;
    }

    /**
     * Get the list of supported properties. This method should not be called by
     * an application.
     * 
     * @param url
     *          the database URL
     * @param info
     *          the connection properties
     * @return a zero length array
     */
    @Override
    public DriverPropertyInfo[] getPropertyInfo(String url, Properties info) {
        return new DriverPropertyInfo[0];
    }

    /**
     * Check if this driver is compliant to the JDBC specification. This method
     * should not be called by an application.
     * 
     * @return true
     */
    @Override
    public boolean jdbcCompliant() {
        return true;
    }

    /**
     * INTERNAL
     */
    public static synchronized Driver load() {
        try {
            if (!registered) {
                registered = true;
                DriverManager.registerDriver(INSTANCE);
            }
        } catch (SQLException e) {
            if (log.isErrorEnabled()) {
                log.error(e);
            }
        }
        return INSTANCE;
    }

    /**
     * INTERNAL
     */
    public static synchronized void unload() {
        try {
            if (registered) {
                registered = false;
                DriverManager.deregisterDriver(INSTANCE);
            }
        } catch (SQLException e) {
            if (log.isErrorEnabled()) {
                log.error(e);
            }
        }
    }

    /**
     * INTERNAL
     */
    public static void setDefaultConnection(Connection c) {
        DEFAULT_CONNECTION.set(c);
    }

    /**
     * INTERNAL
     */
    public static void setThreadContextClassLoader(Thread thread) {
        // This is very likely to create a memory leak.
        try {
            thread.setContextClassLoader(Driver.class.getClassLoader());
        } catch (Throwable t) {
            // ignore
        }
    }

    public Logger getParentLogger() throws SQLFeatureNotSupportedException {
        throw new NotImplementedException();
    }
}