settingsfactory.java

hibernate-3.0.5 中文文档

//$Id: SettingsFactory.java,v 1.33 2005/05/25 04:57:11 oneovthafew Exp $
package org.hibernate.cfg;

import java.io.Serializable;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Map;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.ConnectionReleaseMode;
import org.hibernate.EntityMode;
import org.hibernate.HibernateException;
import org.hibernate.cache.CacheProvider;
import org.hibernate.cache.NoCacheProvider;
import org.hibernate.cache.QueryCacheFactory;
import org.hibernate.connection.ConnectionProvider;
import org.hibernate.connection.ConnectionProviderFactory;
import org.hibernate.dialect.Dialect;
import org.hibernate.dialect.DialectFactory;
import org.hibernate.exception.SQLExceptionConverter;
import org.hibernate.exception.SQLExceptionConverterFactory;
import org.hibernate.hql.QueryTranslatorFactory;
import org.hibernate.jdbc.BatcherFactory;
import org.hibernate.jdbc.BatchingBatcherFactory;
import org.hibernate.jdbc.NonBatchingBatcherFactory;
import org.hibernate.transaction.TransactionFactory;
import org.hibernate.transaction.TransactionFactoryFactory;
import org.hibernate.transaction.TransactionManagerLookup;
import org.hibernate.transaction.TransactionManagerLookupFactory;
import org.hibernate.util.PropertiesHelper;
import org.hibernate.util.ReflectHelper;
import org.hibernate.util.StringHelper;

/**
 * Reads configuration properties and configures a <tt>Settings</tt> instance.
 *
 * @author Gavin King
 */
public class SettingsFactory implements Serializable {
	
	private static final Log log = LogFactory.getLog(SettingsFactory.class);

	protected SettingsFactory() throws HibernateException {}
	
	public Settings buildSettings(Properties props) {
		Settings settings = new Settings();
		
		//SessionFactory name:
		
		String sessionFactoryName = props.getProperty(Environment.SESSION_FACTORY_NAME);
		settings.setSessionFactoryName(sessionFactoryName);

		//JDBC and connection settings:

		ConnectionProvider connections = createConnectionProvider(props);
		settings.setConnectionProvider(connections);

		//Interrogate JDBC metadata
		
		boolean metaSupportsScrollable = false;
		boolean metaSupportsGetGeneratedKeys = false;
		boolean metaSupportsBatchUpdates = false;
		String databaseName = null;
		int databaseMajorVersion = 0;

		try {
			Connection conn = connections.getConnection();
			try {
				DatabaseMetaData meta = conn.getMetaData();
				databaseName = meta.getDatabaseProductName();
				databaseMajorVersion = getDatabaseMajorVersion(meta);
				log.info("RDBMS: " + databaseName + ", version: " + meta.getDatabaseProductVersion() );
				log.info("JDBC driver: " + meta.getDriverName() + ", version: " + meta.getDriverVersion() );
				
				metaSupportsScrollable = meta.supportsResultSetType(ResultSet.TYPE_SCROLL_INSENSITIVE);
				metaSupportsBatchUpdates = meta.supportsBatchUpdates();
				
				if ( Environment.jvmSupportsGetGeneratedKeys() ) {
					try {
						Boolean result = (Boolean) DatabaseMetaData.class.getMethod("supportsGetGeneratedKeys", null)
							.invoke(meta, null);
						metaSupportsGetGeneratedKeys = result.booleanValue();
					}
					catch (AbstractMethodError ame) {
						metaSupportsGetGeneratedKeys = false;
					}
					catch (Exception e) {
						metaSupportsGetGeneratedKeys = false;
					}
				}
				
			}
			finally {
				connections.closeConnection(conn);
			}
		}
		catch (SQLException sqle) {
			log.warn("Could not obtain connection metadata", sqle);
		}
		catch (UnsupportedOperationException uoe) {
			// user supplied JDBC connections
		}
		
		//SQL Dialect:
		Dialect dialect = determineDialect( props, databaseName, databaseMajorVersion );
		settings.setDialect(dialect);
		
		//use dialect default properties
		final Properties properties = new Properties();
		properties.putAll( dialect.getDefaultProperties() );
		properties.putAll(props);
		
		// Transaction settings:
		
		TransactionFactory transactionFactory = createTransactionFactory(properties);
		settings.setTransactionFactory(transactionFactory);
		settings.setTransactionManagerLookup( createTransactionManagerLookup(properties) );

		boolean flushBeforeCompletion = PropertiesHelper.getBoolean(Environment.FLUSH_BEFORE_COMPLETION, properties);
		log.info("Automatic flush during beforeCompletion(): " + enabledDisabled(flushBeforeCompletion) );
		settings.setFlushBeforeCompletionEnabled(flushBeforeCompletion);

		boolean autoCloseSession = PropertiesHelper.getBoolean(Environment.AUTO_CLOSE_SESSION, properties);
		log.info("Automatic session close at end of transaction: " + enabledDisabled(autoCloseSession) );
		settings.setAutoCloseSessionEnabled(autoCloseSession);

		//JDBC and connection settings:

		int batchSize = PropertiesHelper.getInt(Environment.STATEMENT_BATCH_SIZE, properties, 0);
		if ( !metaSupportsBatchUpdates ) batchSize = 0;
		if (batchSize>0) log.info("JDBC batch size: " + batchSize);
		settings.setJdbcBatchSize(batchSize);
		boolean jdbcBatchVersionedData = PropertiesHelper.getBoolean(Environment.BATCH_VERSIONED_DATA, properties, false);
		if (batchSize>0) log.info("JDBC batch updates for versioned data: " + enabledDisabled(jdbcBatchVersionedData) );
		settings.setJdbcBatchVersionedData(jdbcBatchVersionedData);
		settings.setBatcherFactory( createBatcherFactory(properties, batchSize) );
		
		boolean useScrollableResultSets = PropertiesHelper.getBoolean(Environment.USE_SCROLLABLE_RESULTSET, properties, metaSupportsScrollable);
		log.info("Scrollable result sets: " + enabledDisabled(useScrollableResultSets) );
		settings.setScrollableResultSetsEnabled(useScrollableResultSets);

		boolean wrapResultSets = PropertiesHelper.getBoolean(Environment.WRAP_RESULT_SETS, properties, false);
		log.debug( "Wrap result sets: " + enabledDisabled(wrapResultSets) );
		settings.setWrapResultSetsEnabled(wrapResultSets);

		boolean useGetGeneratedKeys = PropertiesHelper.getBoolean(Environment.USE_GET_GENERATED_KEYS, properties, metaSupportsGetGeneratedKeys);
		log.info("JDBC3 getGeneratedKeys(): " + enabledDisabled(useGetGeneratedKeys) );
		settings.setGetGeneratedKeysEnabled(useGetGeneratedKeys);

		Integer statementFetchSize = PropertiesHelper.getInteger(Environment.STATEMENT_FETCH_SIZE, properties);
		if (statementFetchSize!=null) log.info("JDBC result set fetch size: " + statementFetchSize);
		settings.setJdbcFetchSize(statementFetchSize);

		String releaseModeName = properties.getProperty( Environment.RELEASE_CONNECTIONS );
		log.info( "Connection release mode: " + releaseModeName );
		ConnectionReleaseMode releaseMode;
		if ( "auto".equals(releaseModeName) ) {
			releaseMode = transactionFactory.getDefaultReleaseMode();
		}
		else {
			releaseMode = ConnectionReleaseMode.parse( releaseModeName );
			if ( releaseMode == ConnectionReleaseMode.AFTER_STATEMENT && !connections.supportsAggressiveRelease() ) {
				log.warn( "Overriding release mode as connection provider does not support 'after_statement'" );
				releaseMode = ConnectionReleaseMode.AFTER_TRANSACTION;
			}
		}
		settings.setConnectionReleaseMode( releaseMode );

		//SQL Generation settings:

		String defaultSchema = properties.getProperty(Environment.DEFAULT_SCHEMA);
		String defaultCatalog = properties.getProperty(Environment.DEFAULT_CATALOG);
		if (defaultSchema!=null) log.info("Default schema: " + defaultSchema);
		if (defaultCatalog!=null) log.info("Default catalog: " + defaultCatalog);
		settings.setDefaultSchemaName(defaultSchema);
		settings.setDefaultCatalogName(defaultCatalog);

		Integer maxFetchDepth = PropertiesHelper.getInteger(Environment.MAX_FETCH_DEPTH, properties);
		if (maxFetchDepth!=null) log.info("Maximum outer join fetch depth: " + maxFetchDepth);
		settings.setMaximumFetchDepth(maxFetchDepth);
		int batchFetchSize = PropertiesHelper.getInt(Environment.DEFAULT_BATCH_FETCH_SIZE, properties, 1);
		log.info("Default batch fetch size: " + batchFetchSize);
		settings.setDefaultBatchFetchSize(batchFetchSize);

		boolean comments = PropertiesHelper.getBoolean(Environment.USE_SQL_COMMENTS, properties);
		log.info( "Generate SQL with comments: " + enabledDisabled(comments) );
		settings.setCommentsEnabled(comments);
		
		boolean orderUpdates = PropertiesHelper.getBoolean(Environment.ORDER_UPDATES, properties);
		log.info( "Order SQL updates by primary key: " + enabledDisabled(orderUpdates) );