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  package org.apache.cayenne.configuration.runtime;
  
  import java.sql.Driver;
  
  import javax.sql.DataSource;
  
  import org.apache.cayenne.ConfigurationException;
  import org.apache.cayenne.configuration.Constants;
  import org.apache.cayenne.configuration.DataNodeDescriptor;
  import org.apache.cayenne.configuration.DataSourceDescriptor;
  import org.apache.cayenne.configuration.RuntimeProperties;
  import org.apache.cayenne.datasource.DataSourceBuilder;
  import org.apache.cayenne.datasource.UnmanagedPoolingDataSource;
  import org.apache.cayenne.di.AdhocObjectFactory;
  import org.apache.cayenne.di.Inject;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A {@link DataSourceFactory} that loads JDBC connection information from an
   * XML resource associated with the DataNodeDescriptor, returning a DataSource
   * with simple connection pooling.
   * 
   * @since 3.1
   */
  // TODO: this factory does not read XML anymore, should we rename it to something else?
  public class XMLPoolingDataSourceFactory implements DataSourceFactory {
  
  	private static final Logger logger = LoggerFactory.getLogger(XMLPoolingDataSourceFactory.class);
  
  	@Inject
  	private RuntimeProperties properties;
  
  	@Inject
  	private AdhocObjectFactory objectFactory;
  
  	@Override
  	public DataSource getDataSource(DataNodeDescriptor nodeDescriptor) throws Exception {
  
  		DataSourceDescriptor descriptor = nodeDescriptor.getDataSourceDescriptor();
  		if (descriptor == null) {
  			String message = "Null dataSourceDescriptor for nodeDescriptor '" + nodeDescriptor.getName() + "'";
  			logger.info(message);
  			throw new ConfigurationException(message);
  		}
  
  		long maxQueueWaitTime = properties
  				.getLong(Constants.JDBC_MAX_QUEUE_WAIT_TIME, UnmanagedPoolingDataSource.MAX_QUEUE_WAIT_DEFAULT);
  
  		Driver driver = objectFactory.<Driver>getJavaClass(descriptor.getJdbcDriver())
  				.getDeclaredConstructor().newInstance();
  
  		return DataSourceBuilder.url(descriptor.getDataSourceUrl())
  				.driver(driver)
  				.userName(descriptor.getUserName())
  				.password(descriptor.getPassword())
  				.pool(descriptor.getMinConnections(), descriptor.getMaxConnections())
  				.maxQueueWaitTime(maxQueueWaitTime)
  				.build();
  	}
  
  }
  