Class

com.twitter.cache

ConcurrentMapCache

Related Doc: package cache

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class ConcurrentMapCache[K, V] extends FutureCache[K, V]

A com.twitter.cache.FutureCache backed by a java.util.concurrent.ConcurrentMap

Any correct implementation should make sure that you evict failed results, and don't interrupt the underlying request that has been fired off. EvictingCache and Future#interrupting are useful tools for building correct FutureCaches. A reference implementation for caching the results of an asynchronous function with a ConcurrentMap can be found at FutureCache$.fromMap.

Linear Supertypes
FutureCache[K, V], AnyRef, Any
Known Subclasses
CaffeineCache, LoadingFutureCache
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Inherited
  1. ConcurrentMapCache
  2. FutureCache
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Visibility
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Instance Constructors

  1. new ConcurrentMapCache(underlying: ConcurrentMap[K, Future[V]])

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Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any

  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any

  3. final def ==(arg0: Any): Boolean

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    Definition Classes
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  4. final def asInstanceOf[T0]: T0

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  5. def clone(): AnyRef

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    Attributes
    protected[java.lang]
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    AnyRef
    Annotations
    @throws( ... )

  6. final def eq(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef

  7. def equals(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any

  8. def evict(key: K, value: Future[V]): Boolean

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    Evicts the contents of a key if the old value is value.

    Evicts the contents of a key if the old value is value.

    Since com.twitter.util.Future uses reference equality, you must use the same object reference to evict a value.

    returns

    true if the key was evicted false if the key was not evicted

    Definition Classes
    ConcurrentMapCache → FutureCache

  9. def finalize(): Unit

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )

  10. def get(key: K): Option[Future[V]]

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    Gets the cached Future.

    Gets the cached Future.

    returns

    None if a value hasn't been specified for that key yet Some(ksync computation) if the value has been specified. Just because this returns Some(..) doesn't mean that it has been satisfied, but if it hasn't been satisfied, it's probably in-flight.

    Definition Classes
    ConcurrentMapCache → FutureCache

  11. final def getClass(): Class[_]

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    Definition Classes
    AnyRef → Any

  12. def getOrElseUpdate(key: K)(compute: ⇒ Future[V]): Future[V]

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    Gets the cached Future, or if it hasn't been returned yet, computes it and returns that value.

    Gets the cached Future, or if it hasn't been returned yet, computes it and returns that value.

    Definition Classes
    ConcurrentMapCache → FutureCache

  13. def hashCode(): Int

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    AnyRef → Any

  14. final def isInstanceOf[T0]: Boolean

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  15. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
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  16. final def notify(): Unit

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    Definition Classes
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  17. final def notifyAll(): Unit

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    Definition Classes
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  18. def set(key: K, value: Future[V]): Unit

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    Unconditionally sets a value for a given key

    Unconditionally sets a value for a given key

    Definition Classes
    ConcurrentMapCache → FutureCache

  19. def size: Int

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    returns

    the number of results that have been computed successfully or are in flight.

    Definition Classes
    ConcurrentMapCache → FutureCache

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

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    Definition Classes
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  21. def toString(): String

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    Definition Classes
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  22. final def wait(): Unit

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    @throws( ... )

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

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    @throws( ... )

  24. final def wait(arg0: Long): Unit

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    Definition Classes
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    @throws( ... )

Inherited from FutureCache[K, V]

Inherited from AnyRef

Inherited from Any

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