io.aeron.logbuffer

Class TermGapScanner

java.lang.Object

io.aeron.logbuffer.TermGapScanner

public class TermGapScanner
extends java.lang.Object

Scans for gaps in the sequence of bytes in a replicated term buffer between the completed rebuild and the high-water-mark. This can be used for detecting loss and generating a NACK message to the source. Note: This class is threadsafe to be used across multiple threads.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	TermGapScanner.GapHandler Handler for notifying of gaps in the log.

Constructor Summary

Constructors

Constructor and Description
TermGapScanner()

Method Summary

Modifier and Type	Method and Description
static int	scanForGap(org.agrona.concurrent.UnsafeBuffer termBuffer, int termId, int rebuildOffset, int hwmOffset, TermGapScanner.GapHandler handler) Scan for gaps from the rebuildOffset up to the high-water-mark.

Methods inherited from class java.lang.Object

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

Constructor Detail

TermGapScanner

public TermGapScanner()

Method Detail

scanForGap

public static int scanForGap(org.agrona.concurrent.UnsafeBuffer termBuffer,
                             int termId,
                             int rebuildOffset,
                             int hwmOffset,
                             TermGapScanner.GapHandler handler)

Scan for gaps from the rebuildOffset up to the high-water-mark. Each gap will be reported to the TermGapScanner.GapHandler.

Parameters:

termBuffer - to be scanned for a gap.

termId - of the current term buffer.

rebuildOffset - at which to start scanning.

hwmOffset - at which to stop scanning.

handler - to call if a gap is found.

Returns:

offset of last contiguous frame