ets v0.8.0 ETS.KeyValueSet View Source
The Key Value Set is an extension of ETS.Set
which abstracts the concept of tuple records
away, replacing it with the standard concept of key/value. Behind the scenes, the set stores
its records as {key, value}.
Examples
iex> {:ok, kvset} = KeyValueSet.new()
iex> KeyValueSet.put(kvset, :my_key, :my_val)
iex> KeyValueSet.get(kvset, :my_key)
{:ok, :my_val}
KeyValueSet
implements [Access
] behaviour.
Examples
iex> set =
...> KeyValueSet.new!()
...> |> KeyValueSet.put!(:k1, :v1)
...> |> KeyValueSet.put!(:k2, :v2)
...> |> KeyValueSet.put!(:k3, :v3)
iex> get_in(set, [:k1])
:v1
iex> get_in(set, [:z])
nil
iex> with {:v2, set} <-
...> pop_in(set, [:k2]), do: KeyValueSet.to_list!(set)
[k3: :v3, k1: :v1]
iex> with {nil, set} <- pop_in(set, [:z]), do: KeyValueSet.to_list!(set)
[k3: :v3, k1: :v1]
iex> with {:v1, set} <-
...> get_and_update_in(set, [:k1], &{&1, :v42}),
...> do: KeyValueSet.to_list!(set)
[k3: :v3, k1: :v42]
iex> with {:v42, set} <-
...> get_and_update_in(set, [:k1], fn _ -> :pop end),
...> do: KeyValueSet.to_list!(set)
[k3: :v3]
Link to this section Summary
Functions
Deletes KeyValueSet. See ETS.Set.delete/1
.
Deletes record with specified key in specified Set.
Same as delete/1
but unwraps or raises on error.
Same as delete/2
but unwraps or raises on error.
Deletes all records in specified Set.
Same as delete_all/1
but unwraps or raises on error.
Returns first key in KeyValueSet. See ETS.Set.first/1
.
Same as first/1
but unwraps or raises on error.
Returns value for specified key or the provided default (nil if not specified) if no record found.
Same as get/3
but unwraps or raises on error
Returns underlying :ets
table reference. See ETS.Set.get_table/1
.
Same as get_table/1
but unwraps or raises on error.
Determines if specified key exists in KeyValueSet. See ETS.Set.has_key/2
.
Same as has_key/2
but unwraps or raises on error.
Returns info on set. See ETS.Set.info/2
.
Same as info/2
but unwraps or raises on error.
Returns last key in KeyValueSet. See ETS.Set.last/1
.
Same as last/1
but unwraps or raises on error.
Creates new Key Value Set module with the specified options.
Same as new/1
but unwraps or raises on error.
Returns next key in KeyValueSet. See ETS.Set.next/2
.
Same as next/2
but unwraps or raises on error.
Returns previous key in KeyValueSet. See ETS.Set.previous/2
.
Same as previous/2
but unwraps or raises on error.
Puts given value into table for given key.
Same as put/3
but unwraps or raises on error.
Same as put/3
but doesn't put record if the key already exists.
Same as put_new/3
but unwraps or raises on error.
Returns contents of table as a list. See ETS.Set.to_list/1
.
Same as to_list/1
but unwraps or raises on error.
Wraps an existing :ets :set or :ordered_set in a KeyValueSet struct.
Same as wrap_existing/1
but unwraps or raises on error.
Link to this section Types
set_options()
View Sourceset_options() :: [ETS.Base.option() | {:ordered, boolean()}]
Link to this section Functions
delete(key_value_set)
View Sourcedelete(ETS.KeyValueSet.t()) :: {:ok, any()} | {:error, any()}
Deletes KeyValueSet. See ETS.Set.delete/1
.
delete(key_value_set, key)
View Sourcedelete(ETS.KeyValueSet.t(), any()) :: {:ok, ETS.KeyValueSet.t()} | {:error, any()}
Deletes record with specified key in specified Set.
Examples
iex> set = KeyValueSet.new!()
iex> KeyValueSet.put(set, :a, :b)
iex> KeyValueSet.delete(set, :a)
iex> KeyValueSet.get!(set, :a)
nil
Same as delete/1
but unwraps or raises on error.
delete!(set, key)
View Sourcedelete!(ETS.KeyValueSet.t(), any()) :: ETS.KeyValueSet.t()
Same as delete/2
but unwraps or raises on error.
delete_all(key_value_set)
View Sourcedelete_all(ETS.KeyValueSet.t()) :: {:ok, ETS.KeyValueSet.t()} | {:error, any()}
Deletes all records in specified Set.
Examples
iex> set = KeyValueSet.new!()
iex> set
iex> |> KeyValueSet.put!(:a, :d)
iex> |> KeyValueSet.put!(:b, :d)
iex> |> KeyValueSet.put!(:c, :d)
iex> |> KeyValueSet.to_list!()
[c: :d, b: :d, a: :d]
iex> KeyValueSet.delete_all(set)
iex> KeyValueSet.to_list!(set)
[]
delete_all!(set)
View Sourcedelete_all!(ETS.KeyValueSet.t()) :: ETS.KeyValueSet.t()
Same as delete_all/1
but unwraps or raises on error.
first(key_value_set)
View Sourcefirst(ETS.KeyValueSet.t()) :: {:ok, any()} | {:error, any()}
Returns first key in KeyValueSet. See ETS.Set.first/1
.
Same as first/1
but unwraps or raises on error.
get(key_value_set, key, default \\ nil)
View Sourceget(ETS.KeyValueSet.t(), any(), any()) :: {:ok, any()} | {:error, any()}
Returns value for specified key or the provided default (nil if not specified) if no record found.
Examples
iex> KeyValueSet.new!()
iex> |> KeyValueSet.put!(:a, :b)
iex> |> KeyValueSet.put!(:c, :d)
iex> |> KeyValueSet.put!(:e, :f)
iex> |> KeyValueSet.get(:c)
{:ok, :d}
get!(key_value_set, key, default \\ nil)
View Sourceget!(ETS.KeyValueSet.t(), any(), any()) :: any()
Same as get/3
but unwraps or raises on error
get_table(key_value_set)
View Sourceget_table(ETS.KeyValueSet.t()) :: {:ok, ETS.table_reference()} | {:error, any()}
Returns underlying :ets
table reference. See ETS.Set.get_table/1
.
get_table!(key_value_set)
View Sourceget_table!(ETS.KeyValueSet.t()) :: ETS.table_reference()
Same as get_table/1
but unwraps or raises on error.
has_key(key_value_set, key)
View Sourcehas_key(ETS.KeyValueSet.t(), any()) :: {:ok, any()} | {:error, any()}
Determines if specified key exists in KeyValueSet. See ETS.Set.has_key/2
.
has_key!(key_value_set, key)
View Sourcehas_key!(ETS.KeyValueSet.t(), any()) :: any()
Same as has_key/2
but unwraps or raises on error.
info(key_value_set, force_update \\ false)
View Sourceinfo(ETS.KeyValueSet.t(), boolean()) :: {:ok, keyword()} | {:error, any()}
Returns info on set. See ETS.Set.info/2
.
info!(key_value_set, force_update \\ false)
View Sourceinfo!(ETS.KeyValueSet.t(), boolean()) :: keyword()
Same as info/2
but unwraps or raises on error.
last(key_value_set)
View Sourcelast(ETS.KeyValueSet.t()) :: {:ok, any()} | {:error, any()}
Returns last key in KeyValueSet. See ETS.Set.last/1
.
Same as last/1
but unwraps or raises on error.
new(opts \\ [])
View Sourcenew(set_options()) :: {:error, any()} | {:ok, ETS.KeyValueSet.t()}
Creates new Key Value Set module with the specified options.
Possible Options can be found in ETS.Set
with the difference that specifying a keypos
will result in an error.
Examples
iex> {:ok, kvset} = KeyValueSet.new(ordered: true,read_concurrency: true, compressed: false)
iex> KeyValueSet.info!(kvset)[:read_concurrency]
true
# Named :ets tables via the name keyword
iex> {:ok, kvset} = KeyValueSet.new(name: :my_ets_table)
iex> KeyValueSet.info!(kvset)[:name]
:my_ets_table
Same as new/1
but unwraps or raises on error.
next(key_value_set, key)
View Sourcenext(ETS.KeyValueSet.t(), any()) :: {:ok, any()} | {:error, any()}
Returns next key in KeyValueSet. See ETS.Set.next/2
.
next!(key_value_set, key)
View Sourcenext!(ETS.KeyValueSet.t(), any()) :: any()
Same as next/2
but unwraps or raises on error.
previous(key_value_set, key)
View Sourceprevious(ETS.KeyValueSet.t(), any()) :: {:ok, any()} | {:error, any()}
Returns previous key in KeyValueSet. See ETS.Set.previous/2
.
previous!(key_value_set, key)
View Sourceprevious!(ETS.KeyValueSet.t(), any()) :: any()
Same as previous/2
but unwraps or raises on error.
Puts given value into table for given key.
Examples
iex> kvset = KeyValueSet.new!(ordered: true)
iex> {:ok, kvset} = KeyValueSet.put(kvset, :a, :b)
iex> KeyValueSet.get!(kvset, :a)
:b
put!(key_value_set, key, value)
View Sourceput!(ETS.KeyValueSet.t(), any(), any()) :: ETS.KeyValueSet.t()
Same as put/3
but unwraps or raises on error.
put_new(key_value_set, key, value)
View Sourceput_new(ETS.KeyValueSet.t(), any(), any()) :: {:ok, ETS.KeyValueSet.t()} | {:error, any()}
Same as put/3
but doesn't put record if the key already exists.
Examples
iex> set = KeyValueSet.new!(ordered: true)
iex> {:ok, _} = KeyValueSet.put_new(set, :a, :b)
iex> {:ok, _} = KeyValueSet.put_new(set, :a, :c) # skips due toduplicate :a key
iex> KeyValueSet.to_list!(set)
[{:a, :b}]
put_new!(key_value_set, key, value)
View Sourceput_new!(ETS.KeyValueSet.t(), any(), any()) :: ETS.KeyValueSet.t()
Same as put_new/3
but unwraps or raises on error.
to_list(key_value_set)
View Sourceto_list(ETS.KeyValueSet.t()) :: {:ok, any()} | {:error, any()}
Returns contents of table as a list. See ETS.Set.to_list/1
.
Same as to_list/1
but unwraps or raises on error.
wrap_existing(table_identifier)
View Sourcewrap_existing(ETS.table_identifier()) :: {:ok, ETS.KeyValueSet.t()} | {:error, any()}
Wraps an existing :ets :set or :ordered_set in a KeyValueSet struct.
Examples
iex> :ets.new(:my_ets_table, [:set, :named_table])
iex> {:ok, set} = KeyValueSet.wrap_existing(:my_ets_table)
iex> KeyValueSet.info!(set)[:name]
:my_ets_table
wrap_existing!(table_identifier)
View Sourcewrap_existing!(ETS.table_identifier()) :: ETS.KeyValueSet.t()
Same as wrap_existing/1
but unwraps or raises on error.