object MapsUtil
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- def groupByMultipleM[M[_], K, K2, V](m: Map[K, V])(f: (K) => M[Set[K2]])(implicit M: Monad[M]): M[Map[K2, Set[V]]]
- m
An input map
- f
A function to map each of the input keys to a new set of keys ks Generates a new map m' with the following property: If { (k,v) in m and k' in f(k) } then v is in the set m'[k'] See
MapsUtilTestfor an example.
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- def mergeMapsOfSets[K, V](big: Map[K, Set[V]], small: Map[K, Set[V]]): Map[K, Set[V]]
Merges two maps where the values are sets of V
Merges two maps where the values are sets of V
- big
the likely larger of the two maps (so we can merge the small into the big, rather than the other way around)
- small
the likely smaller of the maps.
- def mergeWith[K, V](map1: Map[K, V], map2: Map[K, V])(f: (V, V) => V): Map[K, V]
- def modifyWithConcurrentlyChecked_[A, N, K, V](map: Map[K, V], key: K, notFound: => Checked[A, N, Option[V]], f: (V) => Checked[A, N, Option[V]]): Checked[A, N, Unit]
Specializes updateWithConcurrentlyM_ to the Checked monad, where the non-aborts are only kept from the invocation of
notFoundorfthat causes the first Checked.Abort or updates the map. - def modifyWithConcurrentlyM[F[_], K, V](map: Map[K, V], key: K, notFound: => F[Option[V]], f: (V) => F[Option[V]])(implicit monad: FlatMap[F]): F[Option[V]]
Atomically modifies the given map at the given key.
Atomically modifies the given map at the given key.
notFoundmay be evaluated even if the key is present at the atomic update; in this case, its monadic effect propagates to the result.fmay be evaluated several times on several of the previous values associated to the key, even if no value is associated with the key immediately before the atomic update happens. The monadic effect of all these evaluations propagates to the result.- map
The map that is updated
- notFound
The value to be used if the key was not present in the map. scala.None$ denotes that the map should not be modified.
- f
The function used to transform the value found in the map. If the returned value is scala.None$, the key is removed from the map.
- returns
The value associated with the key before the update.
- def modifyWithConcurrentlyM_[F[_], K, V](map: Map[K, V], key: K, notFound: => F[Option[V]], f: (V) => F[Option[V]])(implicit monad: FlatMap[F]): F[Unit]
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- def putAndCheckExisting[K, V](map: Map[K, V], key: K, value: V)(implicit loggingContext: ErrorLoggingContext): Future[Unit]
Insert the pair (key, value) to
mapif not already present.Insert the pair (key, value) to
mapif not already present. Assert that any existing element forkeyis equal tovalue. - final def synchronized[T0](arg0: => T0): T0
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- def updateWithConcurrently[K, V <: AnyRef](map: Map[K, V], key: K)(f: (V) => V): Boolean
Updates the key of the current map if present.
Updates the key of the current map if present. The update function
fmay be evaluated multiple times. iffthrows an exception, the exception propagates and the map is not updated.- returns
Whether the map changed due to this update
- def updateWithConcurrentlyChecked_[A, N, K, V](map: Map[K, V], key: K, notFound: => Checked[A, N, V], f: (V) => Checked[A, N, V]): Checked[A, N, Unit]
- def updateWithConcurrentlyM[F[_], K, V](map: Map[K, V], key: K, notFound: => F[V], f: (V) => F[V])(implicit monad: FlatMap[F]): F[Option[V]]
Atomically updates the given map at the given key.
Atomically updates the given map at the given key. In comparison to modifyWithConcurrentlyM, this method supports only inserting and updating elements. It does not support removing elements or preventing the insertion of elements when they are not originally in the map.
- def updateWithConcurrentlyM_[F[_], K, V](map: Map[K, V], key: K, notFound: => F[V], f: (V) => F[V])(implicit monad: FlatMap[F]): F[Unit]
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