Uniqueness Problem

UniquenessProblem.java

    
// NodeManager

public <T extends PropertyContainer> T indexPutIfAbsent( Index<T> index, T entity, String key, Object value )
    {
        T existing = index.get( key, value ).getSingle();
        if ( existing != null ) return existing;

        // Grab lock
        IndexLock lock = new IndexLock( index.getName(), key );
        LockType.WRITE.acquire( lock, lockManager ); // 1.
        try
        {
            // Check again
            existing = index.get( key, value ).getSingle();
            if ( existing != null )
            {
                LockType.WRITE.release( lock, lockManager );
                return existing;
            }

            // Add
            index.add( entity, key, value ); // 2
            return null;
        }
        finally
        {
            if ( existing == null ) LockType.WRITE.unacquire( lock, lockManager, lockReleaser ); // 5
        }

// LuceneIndex

    public void add( T entity, String key, Object value )
    {
        LuceneXaConnection connection = getConnection(); // 3 
        assertValidKey( key );
        for ( Object oneValue : IoPrimitiveUtils.asArray( value ) )
        {
            connection.add( this, entity, key, oneValue ); // 4
        }
    }