io.permazen.kv.rocksdb

Class SnapshotRocksDBKVStore

java.lang.Object

io.permazen.kv.AbstractKVStore

io.permazen.kv.rocksdb.RocksDBKVStore

io.permazen.kv.rocksdb.SnapshotRocksDBKVStore

All Implemented Interfaces:

CloseableKVStore, KVStore, Closeable, AutoCloseable

public class SnapshotRocksDBKVStore
extends RocksDBKVStore
implements CloseableKVStore

Read-only KVStore view of a RocksDB Snapshot.

Instances must be close()'d when no longer needed to avoid leaking resources associated with iterators. This class ensures that the configured Snapshot is closed when this instance is closed.

All mutation operations throw UnsupportedOperationException.

Constructor Summary

Constructors

Constructor and Description
SnapshotRocksDBKVStore(org.rocksdb.RocksDB db) Constructor.

Method Summary

Modifier and Type	Method and Description
void	adjustCounter(byte[] key, long amount)
void	close() Close this instance.
void	put(byte[] key, byte[] value)
void	remove(byte[] key)
void	removeRange(byte[] minKey, byte[] maxKey)

Methods inherited from class io.permazen.kv.rocksdb.RocksDBKVStore

decodeCounter, encodeCounter, finalize, get, getDB, getRange, toString

Methods inherited from class io.permazen.kv.AbstractKVStore

getAtLeast, getAtMost

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.permazen.kv.KVStore

apply, decodeCounter, encodeCounter, get, getAtLeast, getAtMost, getRange, getRange, getRange, removeRange

Constructor Detail

SnapshotRocksDBKVStore

public SnapshotRocksDBKVStore(org.rocksdb.RocksDB db)

Constructor.

Parameters:

db - RocksDB database to snapshot

Throws:

NullPointerException - if db is null

Method Detail

close

public void close()

Description copied from class: RocksDBKVStore

Close this instance.

This closes any unclosed iterators returned from getRange(). This does not close the underlying RocksDB or any associated WriteBatch.

Specified by:

close in interface CloseableKVStore

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class RocksDBKVStore

put

public void put(byte[] key,
                byte[] value)

Specified by:

put in interface KVStore

Overrides:

put in class RocksDBKVStore

remove

public void remove(byte[] key)

Specified by:

remove in interface KVStore

Overrides:

remove in class RocksDBKVStore

removeRange

public void removeRange(byte[] minKey,
                        byte[] maxKey)

Specified by:

removeRange in interface KVStore

Overrides:

removeRange in class AbstractKVStore

adjustCounter

public void adjustCounter(byte[] key,
                          long amount)

Specified by:

adjustCounter in interface KVStore

Overrides:

adjustCounter in class RocksDBKVStore