Examples of org.hibernate.LockMode

org.hibernate.LockMode
Instances represent a lock mode for a row of a relational database table. It is not intended that users spend much time worrying about locking since Hibernate usually obtains exactly the right lock level automatically. Some "advanced" users may wish to explicitly specify lock levels. @see Session#lock(Object,LockMode) @author Gavin King

  private void checkVersion(
      ResultSet resultSet,
      ResultSetProcessingContext context,
      EntityKey entityKey,
      Object existing) {
    final LockMode requestedLockMode = context.resolveLockMode( entityReference );
    if ( requestedLockMode != LockMode.NONE ) {
      final LockMode currentLockMode = context.getSession().getPersistenceContext().getEntry( existing ).getLockMode();
      final boolean isVersionCheckNeeded = entityReference.getEntityPersister().isVersioned()
          && currentLockMode.lessThan( requestedLockMode );


      // we don't need to worry about existing version being uninitialized because this block isn't called
      // by a re-entrant load (re-entrant loads *always* have lock mode NONE)
      if ( isVersionCheckNeeded ) {
        //we only check the version when *upgrading* lock modes

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      ( lockOptions.getLockMode() == LockMode.NONE && lockOptions.getAliasLockCount() == 0 ) ) {
      return sql;
    }


    if ( dialect.useFollowOnLocking() ) {
            final LockMode lockMode = determineFollowOnLockMode( lockOptions );
            if( lockMode != LockMode.UPGRADE_SKIPLOCKED ) {
        // Dialect prefers to perform locking in a separate step
        LOG.usingFollowOnLocking();


        final LockOptions lockOptionsToUse = new LockOptions( lockMode );
        lockOptionsToUse.setTimeOut( lockOptions.getTimeOut() );
        lockOptionsToUse.setScope( lockOptions.getScope() );


        afterLoadActions.add(
            new AfterLoadAction() {
                @Override
                public void afterLoad(SessionImplementor session, Object entity, Loadable persister) {
                  ( (Session) session ).buildLockRequest( lockOptionsToUse )
                    .lock( persister.getEntityName(), entity );
                }
                }
        );
        parameters.setLockOptions( new LockOptions() );
        return sql;
      }
    }
    final LockOptions locks = new LockOptions(lockOptions.getLockMode());
    locks.setScope( lockOptions.getScope());
    locks.setTimeOut( lockOptions.getTimeOut());


    final Map keyColumnNames = dialect.forUpdateOfColumns() ? new HashMap() : null;
    final String[] drivingSqlAliases = getAliases();
    for ( int i = 0; i < drivingSqlAliases.length; i++ ) {
      final LockMode lockMode = lockOptions.getAliasSpecificLockMode( drivingSqlAliases[i] );
      if ( lockMode != null ) {
        final Lockable drivingPersister = ( Lockable ) getEntityPersisters()[i];
        final String rootSqlAlias = drivingPersister.getRootTableAlias( drivingSqlAliases[i] );
        locks.setAliasSpecificLockMode( rootSqlAlias, lockMode );
        if ( keyColumnNames != null ) {

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  }




  @Override
  protected LockMode determineFollowOnLockMode(LockOptions lockOptions) {
    final LockMode lockModeToUse = lockOptions.findGreatestLockMode();


    if ( lockOptions.getAliasLockCount() > 1 ) {
      // > 1 here because criteria always uses alias map for the root lock mode (under 'this_')
      LOG.aliasSpecificLockingWithFollowOnLocking( lockModeToUse );
    }

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      return null;
    }
    final int size = entityAliases.length;
    LockMode[] lockModesArray = new LockMode[size];
    for ( int i=0; i<size; i++ ) {
      LockMode lockMode = lockOptions.getAliasSpecificLockMode( entityAliases[i] );
      lockModesArray[i] = lockMode==null ? lockOptions.getLockMode() : lockMode;
    }
    return lockModesArray;
  }

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        if ( canApplyAliasSpecificLockModeHints() ) {
          // extract the alias
          final String alias = hintName.substring( AvailableSettings.ALIAS_SPECIFIC_LOCK_MODE.length() + 1 );
          // determine the LockMode
          try {
            final LockMode lockMode = LockModeTypeHelper.interpretLockMode( value );
            applyAliasSpecificLockModeHint( alias, lockMode );
          }
          catch ( Exception e ) {
            LOG.unableToDetermineLockModeValue( hintName, value );
            applied = false;

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            me.getValue() );
      }
    }
    LockMode[] lockModesArray = new LockMode[names.length];
    for ( int i = 0; i < names.length; i++ ) {
      LockMode lm = ( LockMode ) nameLockOptions.get( names[i] );
      //if ( lm == null ) lm = LockOptions.NONE;
      if ( lm == null ) lm = lockOptions.getLockMode();
      lockModesArray[i] = lm;
    }
    return lockModesArray;

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      Dialect dialect,
      List<AfterLoadAction> afterLoadActions) {
    if ( dialect.useFollowOnLocking() ) {
      LOG.usingFollowOnLocking();
      // currently only one lock mode is allowed in follow-on locking
      final LockMode lockMode = determineFollowOnLockMode( parameters.getLockOptions() );
      final LockOptions lockOptions = new LockOptions( lockMode );
      lockOptions.setTimeOut( parameters.getLockOptions().getTimeOut() );
      lockOptions.setScope( parameters.getLockOptions().getScope() );
      afterLoadActions.add(
          new AfterLoadAction() {

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    }
    return false;
  }


  protected LockMode determineFollowOnLockMode(LockOptions lockOptions) {
    final LockMode lockModeToUse = lockOptions.findGreatestLockMode();


    if ( lockOptions.hasAliasSpecificLockModes() ) {
      LOG.aliasSpecificLockingWithFollowOnLocking( lockModeToUse );
    }

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    //need to hydrate it.


    // grab its state from the ResultSet and keep it in the Session
    // (but don't yet initialize the object itself)
    // note that we acquire LockMode.READ even if it was not requested
    LockMode acquiredLockMode = lockMode == LockMode.NONE ? LockMode.READ : lockMode;
    loadFromResultSet(
        rs,
        i,
        object,
        instanceClass,

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    String entityName = HbmBinder.getEntityName(returnElem, mappings);
    if(entityName==null) {
      throw new MappingException( "<return alias='" + alias + "'> must specify either a class or entity-name");
    }
    LockMode lockMode = getLockMode( returnElem.attributeValue( "lock-mode" ) );


    PersistentClass pc = mappings.getClass( entityName );
    java.util.Map propertyResults = bindPropertyResults(alias, returnElem, pc, mappings );


    return new NativeSQLQueryRootReturn(

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