io.github.whippetdb.memory.db

Class ExternalCacheManager

java.lang.Object

io.github.whippetdb.memory.db.ExternalCacheManager

public class ExternalCacheManager
extends java.lang.Object

Same functionality as CacheManager, but implemented as a reference list in additionally allocated space. It's use may be beneficial for performance in some cases, because of less scattered writes. The cached pages may belong to a different memspace

Field Summary

Fields

Modifier and Type	Field and Description
static int	ADDR_SIZE
static int	BLOCK_SIZE
static int	DATA_OFF
static int	MAX_NUM_ENTRIES
static int	NEXT_ADDR_OFF
static long	NULL
static int	NUM_ENTRIES_OFF
static int	PREV_ADDR_OFF

Constructor Summary

Constructors

Constructor and Description
ExternalCacheManager()

Method Summary

Modifier and Type	Method and Description
static long	allocateBlock(MemDataSpace ms, long cacheAddr, int size, boolean clear)
static long	allocateBlock(MemDataSpace dbMs, MemSpace ms, long cacheAddr, int size, boolean clear)
static long	numCachedBlocks(MemDataSpace dbMs, long cacheAddr)
static void	printCache(MemDataSpace dbMs, long cacheAddr)
static void	releaseBlock(MemDataSpace dbMs, long cacheAddr, long addr)
static void	scanCache(MemDataSpace dbMs, long cacheAddr, java.util.function.LongConsumer consumer)

Methods inherited from class java.lang.Object

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

Field Detail

ADDR_SIZE

public static final int ADDR_SIZE

See Also:

Constant Field Values

NULL

public static final long NULL

See Also:

Constant Field Values

MAX_NUM_ENTRIES

public static final int MAX_NUM_ENTRIES

See Also:

Constant Field Values

NEXT_ADDR_OFF

public static final int NEXT_ADDR_OFF

See Also:

Constant Field Values

PREV_ADDR_OFF

public static final int PREV_ADDR_OFF

See Also:

Constant Field Values

NUM_ENTRIES_OFF

public static final int NUM_ENTRIES_OFF

See Also:

Constant Field Values

DATA_OFF

public static final int DATA_OFF

See Also:

Constant Field Values

BLOCK_SIZE

public static final int BLOCK_SIZE

See Also:

Constant Field Values

Constructor Detail

ExternalCacheManager

public ExternalCacheManager()

Method Detail

allocateBlock

public static long allocateBlock(MemDataSpace ms,
                                 long cacheAddr,
                                 int size,
                                 boolean clear)

allocateBlock

public static long allocateBlock(MemDataSpace dbMs,
                                 MemSpace ms,
                                 long cacheAddr,
                                 int size,
                                 boolean clear)

releaseBlock

public static void releaseBlock(MemDataSpace dbMs,
                                long cacheAddr,
                                long addr)

numCachedBlocks

public static long numCachedBlocks(MemDataSpace dbMs,
                                   long cacheAddr)

scanCache

public static void scanCache(MemDataSpace dbMs,
                             long cacheAddr,
                             java.util.function.LongConsumer consumer)

printCache

public static void printCache(MemDataSpace dbMs,
                              long cacheAddr)