org.neo4j.helpers.collection.Visitor类的使用及代码示例

x33g5p2x  于2022-02-01 转载在 其他  
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本文整理了Java中org.neo4j.helpers.collection.Visitor类的一些代码示例，展示了Visitor类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Visitor类的具体详情如下：
包路径：org.neo4j.helpers.collection.Visitor
类名称：Visitor

Visitor介绍

[英]A visitor to internalize iteration.
[中]使迭代内部化的访问者。

代码示例

代码示例来源：origin: neo4j/neo4j

public void serialize( Collection<StorageCommand> commands ) throws IOException
{
  for ( StorageCommand command : commands )
  {
    serializer.visit( command );
  }
}

代码示例来源：origin: neo4j/neo4j

@Override
public boolean accept( Visitor<StorageCommand,IOException> visitor ) throws IOException
{
  for ( StorageCommand command : commands )
  {
    if ( visitor.visit( command ) )
    {
      return true;
    }
  }
  return false;
}

代码示例来源：origin: neo4j/neo4j

/**
 * Visits this store, and any other store managed by this store.
 * TODO this could, and probably should, replace all override-and-do-the-same-thing-to-all-my-managed-stores
 * methods like:
 * {@link #makeStoreOk()},
 * {@link #close()} (where that method could be deleted all together and do a visit in {@link #close()}),
 * {@link #logIdUsage(Logger)},
 * {@link #logVersions(Logger)}
 * For a good samaritan to pick up later.
 */
void visitStore( Visitor<CommonAbstractStore<RECORD,HEADER>,RuntimeException> visitor )
{
  visitor.visit( this );
}

代码示例来源：origin: neo4j/neo4j

/**
 * Visit all locks.
 * <p/>
 * The supplied visitor may not block.
 *
 * @param visitor visitor for visiting each lock.
 */
public void accept( Visitor<RWLock,RuntimeException> visitor )
{
  synchronized ( resourceLockMap )
  {
    for ( RWLock lock : resourceLockMap.values() )
    {
      if ( visitor.visit( lock ) )
      {
        break;
      }
    }
  }
}

代码示例来源：origin: neo4j/neo4j

@Override
public void run() throws IndexPopulationFailedKernelException
{
  for ( EntityUpdates update : updates )
  {
    if ( stop )
    {
      return;
    }
    visitor.visit( update );
  }
}

代码示例来源：origin: neo4j/neo4j

@Override
public void run() throws IndexPopulationFailedKernelException
{
  for ( EntityUpdates update : updates )
  {
    if ( stop )
    {
      return;
    }
    visitor.visit( update );
  }
}

代码示例来源：origin: neo4j/neo4j

@Override
  public void acceptDiagnosticsVisitor( Object visitor )
  {
    Visitor<? super DiagnosticsProvider, ? extends RuntimeException> target =
        Visitor.SafeGenerics.castOrNull( DiagnosticsProvider.class, RuntimeException.class, visitor );
    if ( target != null )
    {
      for ( DiagnosticsProvider provider : providers )
      {
        target.visit( provider );
      }
    }
  }
} );

代码示例来源：origin: neo4j/neo4j

private void scanAllFields( int pf_flags, Visitor<PageCursor,IOException> visitor )
{
  try ( PageCursor cursor = pagedFile.io( 0, pf_flags ) )
  {
    if ( cursor.next() )
    {
      visitor.visit( cursor );
    }
  }
  catch ( IOException e )
  {
    throw new UnderlyingStorageException( e );
  }
}

代码示例来源：origin: neo4j/neo4j

private void writeSomeData( File file, Visitor<ByteBuffer, IOException> visitor ) throws IOException
{
  try ( StoreChannel channel = fileSystemRule.get().open( file, OpenMode.READ_WRITE ) )
  {
    ByteBuffer buffer = ByteBuffer.allocate( 1024 );
    visitor.visit( buffer );
    buffer.flip();
    channel.write( buffer );
  }
}

代码示例来源：origin: neo4j/neo4j

@Override
  public boolean process( StorageNodeCursor cursor ) throws FAILURE
  {
    long[] labels = cursor.labels();
    if ( labels.length == 0 && labelIds.length != 0 )
    {
      // This node has no labels at all
      return false;
    }

    if ( labelUpdateVisitor != null )
    {
      // Notify the label update visitor
      labelUpdateVisitor.visit( labelChanges( cursor.entityReference(), EMPTY_LONG_ARRAY, labels ) );
    }

    if ( propertyUpdatesVisitor != null && containsAnyEntityToken( labelIds, labels ) )
    {
      // Notify the property update visitor
      EntityUpdates.Builder updates = EntityUpdates.forEntity( cursor.entityReference() ).withTokens( labels );

      if ( hasRelevantProperty( cursor, updates ) )
      {
        return propertyUpdatesVisitor.visit( updates.build() );
      }
    }
    return false;
  }
}

代码示例来源：origin: neo4j/neo4j

@Override
public <EXCEPTION extends Exception> void scanAllRecords( Visitor<RECORD,EXCEPTION> visitor ) throws EXCEPTION
{
  try ( PageCursor cursor = openPageCursorForReading( 0 ) )
  {
    RECORD record = newRecord();
    long highId = getHighId();
    for ( long id = getNumberOfReservedLowIds(); id < highId; id++ )
    {
      getRecordByCursor( id, record, CHECK, cursor );
      if ( record.inUse() )
      {
        visitor.visit( record );
      }
    }
  }
}

代码示例来源：origin: neo4j/neo4j

@Override
  protected boolean process( StorageRelationshipScanCursor cursor ) throws FAILURE
  {
    int reltype = cursor.type();

    if ( propertyUpdatesVisitor != null && containsAnyEntityToken( relationshipTypeIds, reltype ) )
    {
      // Notify the property update visitor
      EntityUpdates.Builder updates = EntityUpdates.forEntity( cursor.entityReference() ).withTokens( reltype );

      if ( hasRelevantProperty( cursor, updates ) )
      {
        return propertyUpdatesVisitor.visit( updates.build() );
      }
    }
    return false;
  }
}

代码示例来源：origin: neo4j/neo4j

NodeRecord after = new NodeRecord( nodeId );
  after.setInUse( true );
  visitor.visit( new Command.NodeCommand( new NodeRecord( nodeId ), after ) );
  return null;
} );

代码示例来源：origin: neo4j/neo4j

private boolean visitPropertyRecordChain( long firstPropertyRecordId, Visitor<PropertyRecord,RuntimeException> visitor )
    throws CircularPropertyRecordChainException
{
  if ( Record.NO_NEXT_PROPERTY.is( firstPropertyRecordId ) )
  {
    return false;
  }
  MutableLongSet visitedPropertyRecordIds = new LongHashSet( 8 );
  visitedPropertyRecordIds.add( firstPropertyRecordId );
  long nextProp = firstPropertyRecordId;
  while ( !Record.NO_NEXT_PROPERTY.is( nextProp ) )
  {
    PropertyRecord propRecord = propertyStore.getRecord( nextProp, propertyStore.newRecord(), FORCE );
    nextProp = propRecord.getNextProp();
    if ( !Record.NO_NEXT_PROPERTY.is( nextProp ) && !visitedPropertyRecordIds.add( nextProp ) )
    {
      throw new CircularPropertyRecordChainException( propRecord );
    }
    if ( visitor.visit( propRecord ) )
    {
      return true;
    }
  }
  return false;
}

代码示例来源：origin: neo4j/neo4j

private void writeSomeData( File file,
      Visitor<Pair<LogEntryWriter,Consumer<LogPositionMarker>>,IOException> visitor ) throws IOException
  {

    try ( LogVersionedStoreChannel versionedStoreChannel = new PhysicalLogVersionedStoreChannel(
        fileSystemRule.get().open( file, OpenMode.READ_WRITE ), logVersion, CURRENT_LOG_VERSION );
        PositionAwarePhysicalFlushableChannel writableLogChannel = new PositionAwarePhysicalFlushableChannel(
            versionedStoreChannel ) )
    {
      writeLogHeader( writableLogChannel, logVersion, 2L );

      Consumer<LogPositionMarker> consumer = marker ->
      {
        try
        {
          writableLogChannel.getCurrentPosition( marker );
        }
        catch ( IOException e )
        {
          throw new RuntimeException( e );
        }
      };
      LogEntryWriter first = new LogEntryWriter( writableLogChannel );
      visitor.visit( Pair.of( first, consumer ) );
    }
  }
}

代码示例来源：origin: org.neo4j/neo4j-kernel

public void serialize( Collection<StorageCommand> commands ) throws IOException
{
  for ( StorageCommand command : commands )
  {
    serializer.visit( command );
  }
}

代码示例来源：origin: org.neo4j/neo4j-kernel

@Override
public boolean accept( Visitor<StorageCommand,IOException> visitor ) throws IOException
{
  for ( StorageCommand command : commands )
  {
    if ( visitor.visit( command ) )
    {
      return true;
    }
  }
  return false;
}

代码示例来源：origin: org.neo4j/neo4j-kernel

/**
 * Visits this store, and any other store managed by this store.
 * TODO this could, and probably should, replace all override-and-do-the-same-thing-to-all-my-managed-stores
 * methods like:
 * {@link #makeStoreOk()},
 * {@link #close()} (where that method could be deleted all together and do a visit in {@link #close()}),
 * {@link #logIdUsage(Logger)},
 * {@link #logVersions(Logger)}
 * For a good samaritan to pick up later.
 */
void visitStore( Visitor<CommonAbstractStore<RECORD,HEADER>,RuntimeException> visitor )
{
  visitor.visit( this );
}

代码示例来源：origin: org.neo4j/neo4j-core-edge

synchronized void visit( Visitor<SegmentFile,RuntimeException> visitor )
{
  ListIterator<SegmentFile> itr = allSegments.listIterator();
  boolean terminate = false;
  while ( itr.hasNext() && !terminate )
  {
    terminate = visitor.visit( itr.next() );
  }
}

代码示例来源：origin: org.neo4j/neo4j-causal-clustering

synchronized void visit( Visitor<SegmentFile,RuntimeException> visitor )
{
  ListIterator<SegmentFile> itr = allSegments.listIterator();
  boolean terminate = false;
  while ( itr.hasNext() && !terminate )
  {
    terminate = visitor.visit( itr.next() );
  }
}

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