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SchemaCrawler is an open-source Java API that makes working with database metadata as easy as working with plain old Java objects. SchemaCrawler is also a database schema discovery and comprehension, and schema documentation tool. You can search for database schema objects using regular expressions, and output the schema and data in a readable text format. The output is designed to be diff-ed against other database schemas.

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/*
========================================================================
SchemaCrawler
http://www.schemacrawler.com
Copyright (c) 2000-2024, Sualeh Fatehi .
All rights reserved.
------------------------------------------------------------------------

SchemaCrawler is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SchemaCrawler and the accompanying materials are made available under
the terms of the Eclipse Public License v1.0, GNU General Public License
v3 or GNU Lesser General Public License v3.

You may elect to redistribute this code under any of these licenses.

The Eclipse Public License is available at:
http://www.eclipse.org/legal/epl-v10.html

The GNU General Public License v3 and the GNU Lesser General Public
License v3 are available at:
http://www.gnu.org/licenses/

========================================================================
*/

package us.fatehi.utility.datasource;

import static us.fatehi.utility.PropertiesUtility.getSystemConfigurationProperty;

import java.sql.Connection;
import java.util.Map;
import java.util.function.Consumer;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.sql.DataSource;

public class DatabaseConnectionSources {

  private static final Logger LOGGER = Logger.getLogger(DatabaseConnectionSources.class.getName());

  public static DatabaseConnectionSource fromDataSource(final DataSource dataSource) {
    return new DataSourceConnectionSource(dataSource);
  }

  public static DatabaseConnectionSource newDatabaseConnectionSource(
      final String connectionUrl,
      final Map connectionProperties,
      final UserCredentials userCredentials,
      final Consumer connectionInitializer) {

    final boolean isSingleThreaded =
        Boolean.valueOf(
            getSystemConfigurationProperty("SC_SINGLE_THREADED", Boolean.FALSE.toString()));
    if (isSingleThreaded) {
      LOGGER.log(Level.CONFIG, "Loading database schema in the main thread");
      return new SingleDatabaseConnectionSource(
          connectionUrl, connectionProperties, userCredentials, connectionInitializer);
    } else {
      LOGGER.log(Level.CONFIG, "Loading database schema using multiple threads");
      return new SimpleDatabaseConnectionSource(
          connectionUrl, connectionProperties, userCredentials, connectionInitializer);
    }
  }

  public static DatabaseConnectionSource newDatabaseConnectionSource(
      final String connectionUrl, final UserCredentials userCredentials) {
    return newDatabaseConnectionSource(connectionUrl, null, userCredentials, connection -> {});
  }

  private DatabaseConnectionSources() {
    // Prevent instantiation
  }
}