org.apache.giraph.block_app.framework.block

Class EmptyBlock

java.lang.Object

org.apache.giraph.block_app.framework.block.EmptyBlock

All Implemented Interfaces:

Iterable<AbstractPiece>, Block

public final class EmptyBlock
extends Object
implements Block

Block without any pieces

Constructor Summary

Constructors

Constructor and Description
EmptyBlock()

Method Summary

Modifier and Type	Method and Description
void	forAllPossiblePieces(Consumer<AbstractPiece> consumer) Calls consumer for each Piece: - in no particular order - potentially calling multiple times on same Piece - even if Piece might never be returned in the iterator - it will be called at least once for every piece that is going to be returned by iterator Can be used for static analysis/introspection of the block, without actually executing them.
PieceCount	getPieceCount() How many pieces are in this block.
Iterator<AbstractPiece>	iterator() Create iterator representing all pieces needed to be executed in this block.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

EmptyBlock

public EmptyBlock()

Method Detail

iterator

public Iterator<AbstractPiece> iterator()

Description copied from interface: Block

Create iterator representing all pieces needed to be executed in this block. After Iterator.next call returns, master compute of returned Piece is guaranteed to be called before calling hasNext/next on the iterator. (allows for iterators logic to depend on the execution dynamically, and not be only static)

Specified by:

iterator in interface Iterable<AbstractPiece>

Specified by:

iterator in interface Block

forAllPossiblePieces

public void forAllPossiblePieces(Consumer<AbstractPiece> consumer)

Description copied from interface: Block

Calls consumer for each Piece: - in no particular order - potentially calling multiple times on same Piece - even if Piece might never be returned in the iterator - it will be called at least once for every piece that is going to be returned by iterator Can be used for static analysis/introspection of the block, without actually executing them.

Specified by:

forAllPossiblePieces in interface Block

getPieceCount

public PieceCount getPieceCount()

Description copied from interface: Block

How many pieces are in this block. Sometimes we don't know (eg RepeatBlock).

Specified by:

getPieceCount in interface Block

Returns:

How many pieces are in this block.