Package org.hibernate.impl

Source Code of org.hibernate.impl.StatelessSessionImpl

//$Id: StatelessSessionImpl.java 10018 2006-06-15 05:21:06Z steve.ebersole@jboss.com $
package org.hibernate.impl;

import java.io.Serializable;
import java.sql.Connection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.CacheMode;
import org.hibernate.ConnectionReleaseMode;
import org.hibernate.Criteria;
import org.hibernate.EmptyInterceptor;
import org.hibernate.EntityMode;
import org.hibernate.FlushMode;
import org.hibernate.HibernateException;
import org.hibernate.Interceptor;
import org.hibernate.LockMode;
import org.hibernate.MappingException;
import org.hibernate.ScrollMode;
import org.hibernate.ScrollableResults;
import org.hibernate.SessionException;
import org.hibernate.StatelessSession;
import org.hibernate.Transaction;
import org.hibernate.UnresolvableObjectException;
import org.hibernate.cache.CacheKey;
import org.hibernate.collection.PersistentCollection;
import org.hibernate.engine.EntityKey;
import org.hibernate.engine.PersistenceContext;
import org.hibernate.engine.QueryParameters;
import org.hibernate.engine.StatefulPersistenceContext;
import org.hibernate.engine.Versioning;
import org.hibernate.engine.query.HQLQueryPlan;
import org.hibernate.engine.query.NativeSQLQueryPlan;
import org.hibernate.engine.query.sql.NativeSQLQuerySpecification;
import org.hibernate.event.EventListeners;
import org.hibernate.id.IdentifierGeneratorFactory;
import org.hibernate.jdbc.Batcher;
import org.hibernate.jdbc.JDBCContext;
import org.hibernate.loader.criteria.CriteriaLoader;
import org.hibernate.loader.custom.CustomLoader;
import org.hibernate.loader.custom.CustomQuery;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.persister.entity.OuterJoinLoadable;
import org.hibernate.pretty.MessageHelper;
import org.hibernate.proxy.HibernateProxy;
import org.hibernate.type.Type;
import org.hibernate.util.CollectionHelper;

/**
* @author Gavin King
*/
public class StatelessSessionImpl extends AbstractSessionImpl
    implements JDBCContext.Context, StatelessSession {

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

  private JDBCContext jdbcContext;
  private PersistenceContext temporaryPersistenceContext = new StatefulPersistenceContext( this );

  StatelessSessionImpl(Connection connection, SessionFactoryImpl factory) {
    super( factory );
    this.jdbcContext = new JDBCContext( this, connection, EmptyInterceptor.INSTANCE );
  }


  // inserts ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  public Serializable insert(Object entity) {
    errorIfClosed();
    return insert(null, entity);
  }

  public Serializable insert(String entityName, Object entity) {
    errorIfClosed();
    EntityPersister persister = getEntityPersister(entityName, entity);
    Serializable id = persister.getIdentifierGenerator().generate(this, entity);
    Object[] state = persister.getPropertyValues(entity, EntityMode.POJO);
    if ( persister.isVersioned() ) {
      boolean substitute = Versioning.seedVersion(state, persister.getVersionProperty(), persister.getVersionType(), this);
      if ( substitute ) {
        persister.setPropertyValues( entity, state, EntityMode.POJO );
      }
    }
    if ( id == IdentifierGeneratorFactory.POST_INSERT_INDICATOR ) {
      id = persister.insert(state, entity, this);
    }
    else {
      persister.insert(id, state, entity, this);
    }
    persister.setIdentifier(entity, id, EntityMode.POJO);
    return id;
  }


  // deletes ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  public void delete(Object entity) {
    errorIfClosed();
    delete(null, entity);
  }

  public void delete(String entityName, Object entity) {
    errorIfClosed();
    EntityPersister persister = getEntityPersister(entityName, entity);
    Serializable id = persister.getIdentifier(entity, EntityMode.POJO);
    Object version = persister.getVersion(entity, EntityMode.POJO);
    persister.delete(id, version, entity, this);
  }


  // updates ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  public void update(Object entity) {
    errorIfClosed();
    update(null, entity);
  }

  public void update(String entityName, Object entity) {
    errorIfClosed();
    EntityPersister persister = getEntityPersister(entityName, entity);
    Serializable id = persister.getIdentifier(entity, EntityMode.POJO);
    Object[] state = persister.getPropertyValues(entity, EntityMode.POJO);
    Object oldVersion;
    if ( persister.isVersioned() ) {
      oldVersion = persister.getVersion(entity, EntityMode.POJO);
      Object newVersion = Versioning.increment( oldVersion, persister.getVersionType(), this );
      Versioning.setVersion(state, newVersion, persister);
      persister.setPropertyValues(entity, state, EntityMode.POJO);
    }
    else {
      oldVersion = null;
    }
    persister.update(id, state, null, false, null, oldVersion, entity, null, this);
  }


  // loading ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  public Object get(Class entityClass, Serializable id) {
    return get( entityClass.getName(), id );
  }

  public Object get(Class entityClass, Serializable id, LockMode lockMode) {
    return get( entityClass.getName(), id, lockMode );
  }

  public Object get(String entityName, Serializable id) {
    return get(entityName, id, LockMode.NONE);
  }

  public Object get(String entityName, Serializable id, LockMode lockMode) {
    errorIfClosed();
    Object result = getFactory().getEntityPersister(entityName)
        .load(id, null, lockMode, this);
    temporaryPersistenceContext.clear();
    return result;
  }

  public void refresh(Object entity) {
    refresh( bestGuessEntityName( entity ), entity, LockMode.NONE );
  }

  public void refresh(String entityName, Object entity) {
    refresh( entityName, entity, LockMode.NONE );
  }

  public void refresh(Object entity, LockMode lockMode) {
    refresh( bestGuessEntityName( entity ), entity, lockMode );
  }

  public void refresh(String entityName, Object entity, LockMode lockMode) {
    final EntityPersister persister = this.getEntityPersister( entityName, entity );
    final Serializable id = persister.getIdentifier( entity, getEntityMode() );
    if ( log.isTraceEnabled() ) {
      log.trace(
          "refreshing transient " +
          MessageHelper.infoString( persister, id, this.getFactory() )
      );
    }
    // TODO : can this ever happen???
//    EntityKey key = new EntityKey( id, persister, source.getEntityMode() );
//    if ( source.getPersistenceContext().getEntry( key ) != null ) {
//      throw new PersistentObjectException(
//          "attempted to refresh transient instance when persistent " +
//          "instance was already associated with the Session: " +
//          MessageHelper.infoString( persister, id, source.getFactory() )
//      );
//    }

    if ( persister.hasCache() ) {
      final CacheKey ck = new CacheKey(
          id,
              persister.getIdentifierType(),
              persister.getRootEntityName(),
              this.getEntityMode(),
              this.getFactory()
      );
      persister.getCache().remove(ck);
    }

    String previousFetchProfile = this.getFetchProfile();
    Object result = null;
    try {
      this.setFetchProfile( "refresh" );
      result = persister.load( id, entity, lockMode, this );
    }
    finally {
      this.setFetchProfile( previousFetchProfile );
    }
    UnresolvableObjectException.throwIfNull( result, id, persister.getEntityName() );
  }

  public Object immediateLoad(String entityName, Serializable id)
      throws HibernateException {
    throw new SessionException("proxies cannot be fetched by a stateless session");
  }

  public void initializeCollection(
      PersistentCollection collection,
          boolean writing) throws HibernateException {
    throw new SessionException("collections cannot be fetched by a stateless session");
  }

  public Object instantiate(
      String entityName,
          Serializable id) throws HibernateException {
    errorIfClosed();
    return getFactory().getEntityPersister( entityName )
        .instantiate( id, EntityMode.POJO );
  }

  public Object internalLoad(
      String entityName,
          Serializable id,
          boolean eager,
          boolean nullable) throws HibernateException {
    errorIfClosed();
    EntityPersister persister = getFactory().getEntityPersister(entityName);
    if ( !eager && persister.hasProxy() ) {
      return persister.createProxy(id, this);
    }
    Object loaded = temporaryPersistenceContext.getEntity( new EntityKey(id, persister, EntityMode.POJO) );
    //TODO: if not loaded, throw an exception
    return loaded==null ? get( entityName, id ) : loaded;
  }

  public Iterator iterate(String query, QueryParameters queryParameters) throws HibernateException {
    throw new UnsupportedOperationException();
  }

  public Iterator iterateFilter(Object collection, String filter, QueryParameters queryParameters)
  throws HibernateException {
    throw new UnsupportedOperationException();
  }

  public List listFilter(Object collection, String filter, QueryParameters queryParameters)
  throws HibernateException {
    throw new UnsupportedOperationException();
  }


  public boolean isOpen() {
    return !isClosed();
  }

  public void close() {
    managedClose();
  }

  public ConnectionReleaseMode getConnectionReleaseMode() {
    return factory.getSettings().getConnectionReleaseMode();
  }

  public boolean isAutoCloseSessionEnabled() {
    return factory.getSettings().isAutoCloseSessionEnabled();
  }

  public boolean isFlushBeforeCompletionEnabled() {
    return true;
  }

  public boolean isFlushModeNever() {
    return false;
  }

  public void managedClose() {
    if ( isClosed() ) {
      throw new SessionException( "Session was already closed!" );
    }
    jdbcContext.getConnectionManager().close();
    setClosed();
  }

  public void managedFlush() {
    errorIfClosed();
    getBatcher().executeBatch();
  }

  public boolean shouldAutoClose() {
    return isAutoCloseSessionEnabled() && !isClosed();
  }

  public void afterTransactionCompletion(boolean successful, Transaction tx) {}

  public void beforeTransactionCompletion(Transaction tx) {}

  public String bestGuessEntityName(Object object) {
    if (object instanceof HibernateProxy) {
      object = ( (HibernateProxy) object ).getHibernateLazyInitializer().getImplementation();
    }
    return guessEntityName(object);
  }

  public Connection connection() {
    errorIfClosed();
    return jdbcContext.borrowConnection();
  }

  public int executeUpdate(String query, QueryParameters queryParameters)
      throws HibernateException {
    errorIfClosed();
    queryParameters.validateParameters();
    HQLQueryPlan plan = getHQLQueryPlan( query, false );
    boolean success = false;
    int result = 0;
    try {
      result = plan.performExecuteUpdate( queryParameters, this );
      success = true;
    }
    finally {
      afterOperation(success);
    }
    temporaryPersistenceContext.clear();
    return result;
  }

  public Batcher getBatcher() {
    errorIfClosed();
    return jdbcContext.getConnectionManager()
        .getBatcher();
  }

  public CacheMode getCacheMode() {
    return CacheMode.IGNORE;
  }

  public int getDontFlushFromFind() {
    return 0;
  }

  public Map getEnabledFilters() {
    return CollectionHelper.EMPTY_MAP;
  }

  public Serializable getContextEntityIdentifier(Object object) {
    errorIfClosed();
    return null;
  }

  public EntityMode getEntityMode() {
    return EntityMode.POJO;
  }

  public EntityPersister getEntityPersister(String entityName, Object object)
      throws HibernateException {
    errorIfClosed();
    if ( entityName==null ) {
      return factory.getEntityPersister( guessEntityName( object ) );
    }
    else {
      return factory.getEntityPersister( entityName )
          .getSubclassEntityPersister( object, getFactory(), EntityMode.POJO );
    }
  }

  public Object getEntityUsingInterceptor(EntityKey key) throws HibernateException {
    errorIfClosed();
    return null;
  }

  public Type getFilterParameterType(String filterParameterName) {
    throw new UnsupportedOperationException();
  }

  public Object getFilterParameterValue(String filterParameterName) {
    throw new UnsupportedOperationException();
  }

  public FlushMode getFlushMode() {
    return FlushMode.COMMIT;
  }

  public Interceptor getInterceptor() {
    return EmptyInterceptor.INSTANCE;
  }

  public EventListeners getListeners() {
    throw new UnsupportedOperationException();
  }

  public PersistenceContext getPersistenceContext() {
    return temporaryPersistenceContext;
  }

  public long getTimestamp() {
    throw new UnsupportedOperationException();
  }

  public String guessEntityName(Object entity) throws HibernateException {
    errorIfClosed();
    return entity.getClass().getName();
  }


  public boolean isConnected() {
    return jdbcContext.getConnectionManager().isCurrentlyConnected();
  }

  public boolean isTransactionInProgress() {
    return jdbcContext.isTransactionInProgress();
  }

  public void setAutoClear(boolean enabled) {
    throw new UnsupportedOperationException();
  }

  public void setCacheMode(CacheMode cm) {
    throw new UnsupportedOperationException();
  }

  public void setFlushMode(FlushMode fm) {
    throw new UnsupportedOperationException();
  }

  public Transaction getTransaction() throws HibernateException {
    errorIfClosed();
    return jdbcContext.getTransaction();
  }

  public Transaction beginTransaction() throws HibernateException {
    errorIfClosed();
    Transaction result = getTransaction();
    result.begin();
    return result;
  }

  public boolean isEventSource() {
    return false;
  }

/////////////////////////////////////////////////////////////////////////////////////////////////////

  //TODO: COPY/PASTE FROM SessionImpl, pull up!

  public List list(String query, QueryParameters queryParameters) throws HibernateException {
    errorIfClosed();
    queryParameters.validateParameters();
    HQLQueryPlan plan = getHQLQueryPlan( query, false );
    boolean success = false;
    List results = CollectionHelper.EMPTY_LIST;
    try {
      results = plan.performList( queryParameters, this );
      success = true;
    }
    finally {
      afterOperation(success);
    }
    temporaryPersistenceContext.clear();
    return results;
  }

  public void afterOperation(boolean success) {
    if ( !jdbcContext.isTransactionInProgress() ) {
      jdbcContext.afterNontransactionalQuery(success);
    }
  }

  public Criteria createCriteria(Class persistentClass, String alias) {
    errorIfClosed();
    return new CriteriaImpl( persistentClass.getName(), alias, this );
  }

  public Criteria createCriteria(String entityName, String alias) {
    errorIfClosed();
    return new CriteriaImpl(entityName, alias, this);
  }

  public Criteria createCriteria(Class persistentClass) {
    errorIfClosed();
    return new CriteriaImpl( persistentClass.getName(), this );
  }

  public Criteria createCriteria(String entityName) {
    errorIfClosed();
    return new CriteriaImpl(entityName, this);
  }

  public ScrollableResults scroll(CriteriaImpl criteria, ScrollMode scrollMode) {
    errorIfClosed();
    String entityName = criteria.getEntityOrClassName();
    CriteriaLoader loader = new CriteriaLoader(
        getOuterJoinLoadable(entityName),
            factory,
            criteria,
            entityName,
            getEnabledFilters()
      );
    return loader.scroll(this, scrollMode);
  }

  public List list(CriteriaImpl criteria) throws HibernateException {
    errorIfClosed();
    String[] implementors = factory.getImplementors( criteria.getEntityOrClassName() );
    int size = implementors.length;

    CriteriaLoader[] loaders = new CriteriaLoader[size];
    for( int i=0; i <size; i++ ) {
      loaders[i] = new CriteriaLoader(
          getOuterJoinLoadable( implementors[i] ),
              factory,
              criteria,
              implementors[i],
              getEnabledFilters()
      );
    }


    List results = Collections.EMPTY_LIST;
    boolean success = false;
    try {
      for( int i=0; i<size; i++ ) {
        final List currentResults = loaders[i].list(this);
        currentResults.addAll(results);
        results = currentResults;
      }
      success = true;
    }
    finally {
      afterOperation(success);
    }
    temporaryPersistenceContext.clear();
    return results;
  }

  private OuterJoinLoadable getOuterJoinLoadable(String entityName) throws MappingException {
    EntityPersister persister = factory.getEntityPersister(entityName);
    if ( !(persister instanceof OuterJoinLoadable) ) {
      throw new MappingException( "class persister is not OuterJoinLoadable: " + entityName );
    }
    return ( OuterJoinLoadable ) persister;
  }

  public List listCustomQuery(CustomQuery customQuery, QueryParameters queryParameters)
  throws HibernateException {
    errorIfClosed();
    CustomLoader loader = new CustomLoader( customQuery, getFactory() );

    boolean success = false;
    List results;
    try {
      results = loader.list(this, queryParameters);
      success = true;
    }
    finally {
      afterOperation(success);
    }
    temporaryPersistenceContext.clear();
    return results;
  }

  public ScrollableResults scrollCustomQuery(CustomQuery customQuery, QueryParameters queryParameters)
  throws HibernateException {
    errorIfClosed();
    CustomLoader loader = new CustomLoader( customQuery, getFactory() );
    return loader.scroll(queryParameters, this);
  }

  public ScrollableResults scroll(String query, QueryParameters queryParameters) throws HibernateException {
    errorIfClosed();
    HQLQueryPlan plan = getHQLQueryPlan( query, false );
    return plan.performScroll( queryParameters, this );
  }

  public void afterScrollOperation() {
    temporaryPersistenceContext.clear();
  }

  public void flush() {}

  public String getFetchProfile() {
    return null;
  }

  public JDBCContext getJDBCContext() {
    return jdbcContext;
  }

  public void setFetchProfile(String name) {}

  public void afterTransactionBegin(Transaction tx) {}

  protected boolean autoFlushIfRequired(Set querySpaces) throws HibernateException {
    // no auto-flushing to support in stateless session
    return false;
  }
 
  public int executeNativeUpdate(NativeSQLQuerySpecification nativeSQLQuerySpecification,
      QueryParameters queryParameters) throws HibernateException {
    errorIfClosed();
    queryParameters.validateParameters();
    NativeSQLQueryPlan plan = getNativeSQLQueryPlan(nativeSQLQuerySpecification);

    boolean success = false;
    int result = 0;
    try {
      result = plan.performExecuteUpdate(queryParameters, this);
      success = true;
    } finally {
      afterOperation(success);
    }
    temporaryPersistenceContext.clear();
    return result;
  }

}
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