Class ValueStoreWalReader

java.lang.Object

org.eclipse.rdf4j.sail.nativerdf.wal.ValueStoreWalReader

All Implemented Interfaces:

AutoCloseable

public final class ValueStoreWalReader
extends Object
implements AutoCloseable

Reader for ValueStore WAL segments that yields minted records in LSN order across segments. It tolerates truncated or missing tail data by stopping at the last valid record observed. Completeness can be queried via isComplete() and by inspecting ValueStoreWalReader.ScanResult.complete().

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	ValueStoreWalReader.ScanResult	Result of a full WAL scan.

Method Summary

Modifier and Type	Method	Description
void	close()
Iterator<ValueStoreWalRecord>	iterator()	On-demand iterator over minted WAL records.
long	lastValidLsn()	Highest valid LSN observed during reading (iterator/scan).
static ValueStoreWalReader	open(ValueStoreWalConfig config)	Create a reader for the given configuration.
ValueStoreWalReader.ScanResult	scan()	Scan the WAL and return all minted records together with bookkeeping about last valid LSN and completeness.

Methods inherited from class Object

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

Method Details

open

public static ValueStoreWalReader open(ValueStoreWalConfig config)

Create a reader for the given configuration. No I/O is performed until iteration begins.

scan

public ValueStoreWalReader.ScanResult scan()
                                    throws IOException

Scan the WAL and return all minted records together with bookkeeping about last valid LSN and completeness.

Throws:

IOException

iterator

public Iterator<ValueStoreWalRecord> iterator()

On-demand iterator over minted WAL records.

lastValidLsn

public long lastValidLsn()

Highest valid LSN observed during reading (iterator/scan).

close

public void close()

Specified by:

close in interface AutoCloseable