Interface MemoryPressureController

All Known Implementing Classes:

MemoryPressureController.JvmMemoryPressureController

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface MemoryPressureController

Determines whether caches should proactively shed entries.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	MemoryPressureController.JvmMemoryPressureController

Field Summary

Fields

Modifier and Type	Field	Description
static final String	MEMORY_PRESSURE_GC_TIME_THRESHOLD_PERCENT_PROPERTY	GC-time percentage over the sampling window that triggers JVM-wide memory-aware cache trimming.
static final String	MEMORY_PRESSURE_HEAP_THRESHOLD_PERCENT_PROPERTY	Heap usage percentage that triggers JVM-wide memory-aware cache trimming.
static final String	MEMORY_PRESSURE_MAX_TRIM_WEIGHT_PROPERTY	Maximum cache weight to evict per observed memory-pressure pass.
static final String	MEMORY_PRESSURE_TRIM_RATIO_PERCENT_PROPERTY	Percentage of the registered memory-aware cache weight to evict per observed memory-pressure pass.
static final MemoryPressureController	NONE

Method Summary

Modifier and Type	Method	Description
static MemoryPressureController	jvm()
static MemoryPressureController	jvm(PropertySource propertySource)
default long	maxTrimWeight()
static MemoryPressureController	none()
boolean	shouldEvict(long currentWeight, long maxWeight)
default int	trimRatioPercent()

Field Details

MEMORY_PRESSURE_HEAP_THRESHOLD_PERCENT_PROPERTY

static final String MEMORY_PRESSURE_HEAP_THRESHOLD_PERCENT_PROPERTY

Heap usage percentage that triggers JVM-wide memory-aware cache trimming. Defaults to 85.

See Also:

• Constant Field Values

MEMORY_PRESSURE_GC_TIME_THRESHOLD_PERCENT_PROPERTY

static final String MEMORY_PRESSURE_GC_TIME_THRESHOLD_PERCENT_PROPERTY

GC-time percentage over the sampling window that triggers JVM-wide memory-aware cache trimming. Defaults to 20.

See Also:

• Constant Field Values

MEMORY_PRESSURE_TRIM_RATIO_PERCENT_PROPERTY

static final String MEMORY_PRESSURE_TRIM_RATIO_PERCENT_PROPERTY

Percentage of the registered memory-aware cache weight to evict per observed memory-pressure pass. Defaults to 20.

See Also:

• Constant Field Values

MEMORY_PRESSURE_MAX_TRIM_WEIGHT_PROPERTY

static final String MEMORY_PRESSURE_MAX_TRIM_WEIGHT_PROPERTY

Maximum cache weight to evict per observed memory-pressure pass. For byte-weighted caches this is bytes; for count-weighted caches this is entries. Defaults to 1 GiB.

See Also:

• Constant Field Values

NONE

static final MemoryPressureController NONE

Method Details

shouldEvict

boolean shouldEvict(long currentWeight,
 long maxWeight)

trimRatioPercent

default int trimRatioPercent()

maxTrimWeight

default long maxTrimWeight()

none

static MemoryPressureController none()

jvm

static MemoryPressureController jvm()

jvm

static MemoryPressureController jvm(PropertySource propertySource)