Class BLCHeader.DrainStatusRef<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

com.github.benmanes.caffeine.cache.BLCHeader.PadDrainStatus<K,V>

com.github.benmanes.caffeine.cache.BLCHeader.DrainStatusRef<K,V>

All Implemented Interfaces:

Map<K,V>

Direct Known Subclasses:

BoundedLocalCache

Enclosing class:

BLCHeader

abstract static class BLCHeader.DrainStatusRef<K,V>
extends BLCHeader.PadDrainStatus<K,V>

Enforces a memory layout to avoid false sharing by padding the drain status.

Nested Class Summary

Nested classes/interfaces inherited from class AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface Map

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final long	DRAIN_STATUS_OFFSET
(package private) int	drainStatus	The draining status of the buffers.
(package private) static final int	IDLE	A drain is not taking place.
(package private) static final int	PROCESSING_TO_IDLE	A drain is in progress and will transition to idle.
(package private) static final int	PROCESSING_TO_REQUIRED	A drain is in progress and will transition to required.
(package private) static final int	REQUIRED	A drain is required due to a pending write modification.

Fields inherited from class BLCHeader.PadDrainStatus

p000, p001, p002, p003, p004, p005, p006, p007, p008, p009, p010, p011, p012, p013, p014, p015, p016, p017, p018, p019, p020, p021, p022, p023, p024, p025, p026, p027, p028, p029, p030, p031, p032, p033, p034, p035, p036, p037, p038, p039, p040, p041, p042, p043, p044, p045, p046, p047, p048, p049, p050, p051, p052, p053, p054, p055, p056, p057, p058, p059, p060, p061, p062, p063, p064, p065, p066, p067, p068, p069, p070, p071, p072, p073, p074, p075, p076, p077, p078, p079, p080, p081, p082, p083, p084, p085, p086, p087, p088, p089, p090, p091, p092, p093, p094, p095, p096, p097, p098, p099, p100, p101, p102, p103, p104, p105, p106, p107, p108, p109, p110, p111, p112, p113, p114, p115, p116, p117, p118, p119

Constructor Summary

Constructors

Constructor	Description
DrainStatusRef()

Method Summary

Modifier and Type	Method	Description
(package private) boolean	casDrainStatus(int expect, int update)
(package private) int	drainStatus()
(package private) void	lazySetDrainStatus(int drainStatus)
(package private) boolean	shouldDrainBuffers(boolean delayable)	Returns whether maintenance work is needed.

Methods inherited from class AbstractMap

clear, clone, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, put, putAll, remove, size, toString, values

Methods inherited from class Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Field Details

DRAIN_STATUS_OFFSET

static final long DRAIN_STATUS_OFFSET

IDLE

static final int IDLE

A drain is not taking place.

See Also:

• Constant Field Values

REQUIRED

static final int REQUIRED

A drain is required due to a pending write modification.

See Also:

• Constant Field Values

PROCESSING_TO_IDLE

static final int PROCESSING_TO_IDLE

A drain is in progress and will transition to idle.

See Also:

• Constant Field Values

PROCESSING_TO_REQUIRED

static final int PROCESSING_TO_REQUIRED

A drain is in progress and will transition to required.

See Also:

• Constant Field Values

drainStatus

volatile int drainStatus

The draining status of the buffers.

Constructor Details

DrainStatusRef

DrainStatusRef()

Method Details

shouldDrainBuffers

boolean shouldDrainBuffers(boolean delayable)

Returns whether maintenance work is needed.

Parameters:

delayable - if draining the read buffer can be delayed

drainStatus

int drainStatus()

lazySetDrainStatus

void lazySetDrainStatus(int drainStatus)

casDrainStatus

boolean casDrainStatus(int expect,
 int update)