Module org.yamcs.core

Package org.yamcs.yarch.rocksdb

Class RdbSequence

java.lang.Object

org.yamcs.yarch.rocksdb.RdbSequence

All Implemented Interfaces:

Sequence

public class RdbSequence
extends Object
implements Sequence

sequence stored in the Rocksdb metadata.

The sequence will "cache" some numbers such that it does not have to update the database after each increment. If the system crashes, the numbers cached will be lost.

Constructor Summary

Constructors

Constructor	Description
RdbSequence(String name, YRDB rdb, org.rocksdb.ColumnFamilyHandle cfMetadata)

Method Summary

Modifier and Type	Method	Description
void	close()
long	get()	Return the current sequence value
static byte[]	getDbKey(String name)
static String	getName(byte[] dbkey)
static long	getValue(byte[] value)
long	next()
void	reset(long value)

Methods inherited from class java.lang.Object

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

Constructor Details

RdbSequence

public RdbSequence(String name,
 YRDB rdb,
 org.rocksdb.ColumnFamilyHandle cfMetadata)
            throws org.rocksdb.RocksDBException,
YarchException

Throws:

org.rocksdb.RocksDBException

YarchException

Method Details

next

public long next()
          throws YarchException

Specified by:

next in interface Sequence

Throws:

YarchException

close

public void close()
           throws YarchException

Throws:

YarchException

reset

public void reset(long value)

Specified by:

reset in interface Sequence

get

public long get()

Return the current sequence value

Returns:

getName

public static String getName(byte[] dbkey)

getDbKey

public static byte[] getDbKey(String name)

getValue

public static long getValue(byte[] value)