tech.mlsql.common.utils.cache

Class CacheBuilderSpec

java.lang.Object

tech.mlsql.common.utils.cache.CacheBuilderSpec

@Beta
public final class CacheBuilderSpec
extends Object

A specification of a CacheBuilder configuration.

CacheBuilderSpec supports parsing configuration off of a string, which makes it especially useful for command-line configuration of a CacheBuilder.

The string syntax is a series of comma-separated keys or key-value pairs, each corresponding to a CacheBuilder method.

• concurrencyLevel=[integer]: sets CacheBuilder.concurrencyLevel.
• initialCapacity=[integer]: sets CacheBuilder.initialCapacity.
• maximumSize=[long]: sets CacheBuilder.maximumSize.
• maximumWeight=[long]: sets CacheBuilder.maximumWeight.
• expireAfterAccess=[duration]: sets CacheBuilder.expireAfterAccess(long, java.util.concurrent.TimeUnit).
• expireAfterWrite=[duration]: sets CacheBuilder.expireAfterWrite(long, java.util.concurrent.TimeUnit).
• refreshAfterWrite=[duration]: sets CacheBuilder.refreshAfterWrite(long, java.util.concurrent.TimeUnit).
• weakKeys: sets CacheBuilder.weakKeys().
• softValues: sets CacheBuilder.softValues().
• weakValues: sets CacheBuilder.weakValues().
• recordStats: sets CacheBuilder.recordStats().

The set of supported keys will grow as CacheBuilder evolves, but existing keys will never be removed.

Durations are represented by an integer, followed by one of "d", "h", "m", or "s", representing days, hours, minutes, or seconds respectively. (There is currently no syntax to request expiration in milliseconds, microseconds, or nanoseconds.)

Whitespace before and after commas and equal signs is ignored. Keys may not be repeated; it is also illegal to use the following pairs of keys in a single value:

• maximumSize and maximumWeight
• softValues and weakValues

CacheBuilderSpec does not support configuring CacheBuilder methods with non-value parameters. These must be configured in code.

A new CacheBuilder can be instantiated from a CacheBuilderSpec using CacheBuilder.from(CacheBuilderSpec) or CacheBuilder.from(String).

Since:

12.0

Author:

Adam Winer

Method Summary

Modifier and Type	Method and Description
static CacheBuilderSpec	disableCaching() Returns a CacheBuilderSpec that will prevent caching.
boolean	equals(Object obj)
int	hashCode()
static CacheBuilderSpec	parse(String cacheBuilderSpecification) Creates a CacheBuilderSpec from a string.
String	toParsableString() Returns a string that can be used to parse an equivalent CacheBuilderSpec.
String	toString() Returns a string representation for this CacheBuilderSpec instance.

Methods inherited from class java.lang.Object

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

Method Detail

parse

public static CacheBuilderSpec parse(String cacheBuilderSpecification)

Creates a CacheBuilderSpec from a string.

Parameters:

cacheBuilderSpecification - the string form

disableCaching

public static CacheBuilderSpec disableCaching()

Returns a CacheBuilderSpec that will prevent caching.

toParsableString

public String toParsableString()

Returns a string that can be used to parse an equivalent CacheBuilderSpec. The order and form of this representation is not guaranteed, except that reparsing its output will produce a CacheBuilderSpec equal to this instance.

toString

public String toString()

Returns a string representation for this CacheBuilderSpec instance. The form of this representation is not guaranteed.

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(@Nullable
                      Object obj)

Overrides:

equals in class Object