import org.hibernate.context.spi.CurrentSessionContext; //导入依赖的package包/类
private CurrentSessionContext buildCurrentSessionContext() {
	String impl = properties.getProperty( Environment.CURRENT_SESSION_CONTEXT_CLASS );
	// for backward-compatibility
	if ( impl == null ) {
		if ( canAccessTransactionManager() ) {
			impl = "jta";
		}
		else {
			return null;
		}
	}

	if ( "jta".equals( impl ) ) {
		if ( ! transactionFactory().compatibleWithJtaSynchronization() ) {
			LOG.autoFlushWillNotWork();
		}
		return new JTASessionContext( this );
	}
	else if ( "thread".equals( impl ) ) {
		return new ThreadLocalSessionContext( this );
	}
	else if ( "managed".equals( impl ) ) {
		return new ManagedSessionContext( this );
	}
	else {
		try {
			Class implClass = serviceRegistry.getService( ClassLoaderService.class ).classForName( impl );
			return ( CurrentSessionContext ) implClass
					.getConstructor( new Class[] { SessionFactoryImplementor.class } )
					.newInstance( this );
		}
		catch( Throwable t ) {
			LOG.unableToConstructCurrentSessionContext( impl, t );
			return null;
		}
	}
}
 

import org.hibernate.context.spi.CurrentSessionContext; //导入依赖的package包/类
private CurrentSessionContext buildCurrentSessionContext() {
	String impl = properties
			.getProperty(Environment.CURRENT_SESSION_CONTEXT_CLASS);
	// for backward-compatibility
	if (impl == null) {
		if (canAccessTransactionManager()) {
			impl = "jta";
		} else {
			return null;
		}
	}

	if ("jta".equals(impl)) {
		if (!transactionFactory().compatibleWithJtaSynchronization()) {
			LOG.autoFlushWillNotWork();
		}
		return new JTASessionContext(this);
	} else if ("thread".equals(impl)) {
		return new ThreadLocalSessionContext(this);
	} else if ("managed".equals(impl)) {
		return new ManagedSessionContext(this);
	} else {
		try {
			Class implClass = serviceRegistry.getService(
					ClassLoaderService.class).classForName(impl);
			return (CurrentSessionContext) implClass.getConstructor(
					new Class[] { SessionFactoryImplementor.class })
					.newInstance(this);
		} catch (Throwable t) {
			LOG.unableToConstructCurrentSessionContext(impl, t);
			return null;
		}
	}
}