@GwtIncompatible public final class CacheBuilderSpec extends Object
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(java.time.Duration)
.
expireAfterWrite=[duration]
: sets CacheBuilder.expireAfterWrite(java.time.Duration)
.
refreshAfterWrite=[duration]
: sets CacheBuilder.refreshAfterWrite(java.time.Duration)
.
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)
.
Modifier and Type | Method and Description |
---|---|
static CacheBuilderSpec |
disableCaching()
Returns a CacheBuilderSpec that will prevent caching.
|
boolean |
equals(@Nullable Object obj)
Indicates whether some other object is "equal to" this one.
|
int |
hashCode()
Returns a hash code value for the object.
|
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.
|
public static CacheBuilderSpec parse(String cacheBuilderSpecification)
cacheBuilderSpecification
- the string formpublic static CacheBuilderSpec disableCaching()
public String toParsableString()
CacheBuilderSpec
. The order
and form of this representation is not guaranteed, except that reparsing its output will
produce a CacheBuilderSpec
equal to this instance.public String toString()
public int hashCode()
java.lang.Object
HashMap
.
The general contract of hashCode
is:
hashCode
method
must consistently return the same integer, provided no information
used in equals
comparisons on the object is modified.
This integer need not remain consistent from one execution of an
application to another execution of the same application.
equals(Object)
method, then calling the hashCode
method on each of
the two objects must produce the same integer result.
Object.equals(java.lang.Object)
method, then calling the hashCode
method on each of the
two objects must produce distinct integer results. However, the
programmer should be aware that producing distinct integer results
for unequal objects may improve the performance of hash tables.
As much as is reasonably practical, the hashCode method defined by
class Object
does return distinct integers for distinct
objects. (This is typically implemented by converting the internal
address of the object into an integer, but this implementation
technique is not required by the
Java™ programming language.)
hashCode
in class Object
Object.equals(java.lang.Object)
,
System.identityHashCode(java.lang.Object)
public boolean equals(@Nullable Object obj)
java.lang.Object
The equals
method implements an equivalence relation
on non-null object references:
x
, x.equals(x)
should return
true
.
x
and y
, x.equals(y)
should return true
if and only if
y.equals(x)
returns true
.
x
, y
, and z
, if
x.equals(y)
returns true
and
y.equals(z)
returns true
, then
x.equals(z)
should return true
.
x
and y
, multiple invocations of
x.equals(y)
consistently return true
or consistently return false
, provided no
information used in equals
comparisons on the
objects is modified.
x
,
x.equals(null)
should return false
.
The equals
method for class Object
implements
the most discriminating possible equivalence relation on objects;
that is, for any non-null reference values x
and
y
, this method returns true
if and only
if x
and y
refer to the same object
(x == y
has the value true
).
Note that it is generally necessary to override the hashCode
method whenever this method is overridden, so as to maintain the
general contract for the hashCode
method, which states
that equal objects must have equal hash codes.
equals
in class Object
obj
- the reference object with which to compare.true
if this object is the same as the obj
argument; false
otherwise.Object.hashCode()
,
HashMap
Copyright © 2010–2019. All rights reserved.