Package org.apache.flink.runtime.io.network.partition.hybrid.index

Interface FileDataIndexRegionHelper<T extends FileDataIndexRegionHelper.Region>

public interface FileDataIndexRegionHelper<T extends FileDataIndexRegionHelper.Region>

FileDataIndexRegionHelper is responsible for writing a FileDataIndexRegionHelper.Region to the file or reading a FileDataIndexRegionHelper.Region from file.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	FileDataIndexRegionHelper.Region	A FileDataIndexRegionHelper.Region Represents a series of buffers that are: From the same subpartition Logically (i.e. buffer index) consecutive Physically (i.e. offset in the file) consecutive

Method Summary

Modifier and Type	Method	Description
T	readRegionFromFile(FileChannel channel, long fileOffset)	Read a region from the file.
void	writeRegionToFile(FileChannel channel, T region)	Write the region to the file.

Method Details

writeRegionToFile

void writeRegionToFile(FileChannel channel,
 T region)
                throws IOException

Write the region to the file.

Parameters:

channel - the file channel to write the region

region - the region to be written to the file

Throws:

IOException

readRegionFromFile

T readRegionFromFile(FileChannel channel,
 long fileOffset)
              throws IOException

Read a region from the file.

Parameters:

channel - the file channel to read the region

fileOffset - the current region data is from this file offset, so start reading the file from the offset when reading the region

Returns:

the region read from the file

Throws:

IOException