elixir_google_spreadsheets v0.1.6 GSS.Client.Limiter
Model of Limiter request subscribed to Client with partition :write or :read
This process is a ProducerConsumer for this GenStage pipeline.
Link to this section Summary
Functions
Check to reach limit
Gives events for the next stage to process when requested
Invoked on :producer_consumer
and :consumer
stages to handle events
Ask new events if needed
Invoked when the server is started
Starts an limiter manager linked to the current process
Link to this section Types
options() :: [name: atom, max_demand: pos_integer | nil, max_interval: timeout | nil, interval: timeout | nil, clients: [{atom, keyword} | atom]]
state() :: %GSS.Client.Limiter{interval: timeout, max_demand: pos_integer, max_interval: timeout, producer: GenStage.from, scheduled_at: pos_integer | nil, taked_events: pos_integer}
Link to this section Functions
Check to reach limit.
If limit not reached ask again after :interval
timeout,
otherwise ask after :max_interval
timeout.
Gives events for the next stage to process when requested
Invoked on :producer_consumer
and :consumer
stages to handle events.
Must always be explicitly implemented by such types.
Return values are the same as c:handle_cast/2
.
Callback implementation for GenStage.handle_events/3
.
Ask new events if needed
Invoked when the server is started.
start_link/3
(or start/3
) will block until this callback returns.
args
is the argument term (second argument) passed to start_link/3
(or start/3
).
In case of successful start, this callback must return a tuple where the first element is the stage type, which is one of:
:producer
:consumer
:producer_consumer
(if the stage is acting as both)
For example:
def init(args) do
{:producer, some_state}
end
The returned tuple may also contain 3 or 4 elements. The third
element may be the :hibernate
atom or a set of options defined
below.
Returning :ignore
will cause start_link/3
to return :ignore
and the process will exit normally without entering the loop or
calling terminate/2
.
Returning {:stop, reason}
will cause start_link/3
to return
{:error, reason}
and the process to exit with reason reason
without entering the loop or calling terminate/2
.
Options
This callback may return options. Some options are specific to the chosen stage type while others are shared across all types.
:producer
options
:demand
- when:forward
, the demand is always forwarded to thec:handle_demand/2
callback. When:accumulate
, demand is accumulated until its mode is set to:forward
viademand/2
. This is useful as a synchronization mechanism, where the demand is accumulated until all consumers are subscribed. Defaults to:forward
.
:producer
and :producer_consumer
options
:buffer_size
- the size of the buffer to store events without demand. Can be:infinity
to signal no limit on the buffer size. Check the “Buffer events” section of the module documentation. Defaults to10_000
for:producer
,:infinity
for:producer_consumer
.:buffer_keep
- returns whether the:first
or:last
entries should be kept on the buffer in case the buffer size is exceeded. Defaults to:last
.:dispatcher
- the dispatcher responsible for handling demands. Defaults toGenStage.DemandDispatch
. May be either an atom representing a dispatcher module or a two-element tuple with the dispatcher module and the dispatcher options.
:consumer
and :producer_consumer
options
:subscribe_to
- a list of producers to subscribe to. Each element represents either the producer module or a tuple with the producer module and the subscription options (as defined insync_subscribe/2
).
Callback implementation for GenStage.init/1
.
Starts an limiter manager linked to the current process.
If the event manager is successfully created and initialized, the function returns {:ok, pid}, where pid is the PID of the server. If a process with the specified server name already exists, the function returns {:error, {:already_started, pid}} with the PID of that process.
Options
:name
- used for name registration as described in the “Name registration” section of the module documentation:interval
- ask new events from producer after:interval
milliseconds.:max_demand
- count of maximum requests per:maximum_interval
:max_interval
- maximum time that allowed in:max_demand
requests:clients
- list of clients with partition options. For example[{GSS.Client, partition: :read}}]
.