SingletonCache

For objects that need their lifecycle to be managed and can't be just throw-away. E.g. for when ConcurrentHashMap.putIfAbsent(new Something()) may result in a Something instance that need to be closed if another thread's putIfAbsent was successful.

In this case it's easier to not create unnecessary instances in the first place.

Linear Supertypes

AnyRef, Any

Instance Constructors

new SingletonCache()

Value Members

final def !=(arg0: Any): Boolean

Definition Classes
AnyRef → Any
final def ##(): Int

Definition Classes
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final def ==(arg0: Any): Boolean

Definition Classes
AnyRef → Any
def apply[V](key: K)(generator: ⇒ V): V

Get a cached value for a key or generate a new one if missing.
Get a cached value for a key or generate a new one if missing. Only calls generator() once for each missing key. Generator is given here and not in the constructor to allow for caching of values of different types where type info is required for generator to work. E.g. calls that use reflection.
final def asInstanceOf[T0]: T0

Definition Classes
Any
def asMap[V]: Map[K, V]
def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( ... )
final def eq(arg0: AnyRef): Boolean

Definition Classes
AnyRef
def equals(arg0: Any): Boolean

Definition Classes
AnyRef → Any
def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
final def getClass(): Class[_]

Definition Classes
AnyRef → Any
def hashCode(): Int

Definition Classes
AnyRef → Any
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
final def ne(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def notify(): Unit

Definition Classes
AnyRef
final def notifyAll(): Unit

Definition Classes
AnyRef
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def toString(): String

Definition Classes
AnyRef → Any
def values[V]: Iterable[V]
final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )

Related Doc: package util

class SingletonCache[K] extends AnyRef

Instance Constructors

new SingletonCache()

Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

def apply[V](key: K)(generator: ⇒ V): V

final def asInstanceOf[T0]: T0

def asMap[V]: Map[K, V]

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

final def synchronized[T0](arg0: ⇒ T0): T0

def toString(): String

def values[V]: Iterable[V]

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

Inherited from AnyRef

Inherited from Any

Ungrouped