org.apache.flink.runtime.util

Interface MemoryBlockIterator

All Known Implementing Classes:

BlockResettableMutableObjectIterator, NonReusingBlockResettableIterator, ReusingBlockResettableIterator

public interface MemoryBlockIterator

The memory block iterator is an iterator that always buffers a block of elements in memory.

Method Summary

Modifier and Type	Method and Description
boolean	nextBlock() Move the iterator to the next memory block.

Method Detail

nextBlock

boolean nextBlock()
           throws IOException

Move the iterator to the next memory block. The next memory block starts at the first element that was not in the block before. A special case is when no record was in the block before, which happens when this function is invoked two times directly in a sequence, without calling hasNext() or next in between. Then the block moves one element.

Returns:

True if a new memory block was loaded, false if there were no further records and hence no further memory block.

Throws:

IOException - Thrown, when advancing to the next block failed.