batch_elixir v0.2.2 BatchElixir.Stats.Statix View Source

Link to this section Summary

Functions

Returns a specification to start this module under a supervisor

Opens the connection to the StatsD-compatible server

Decrements the StatsD counter identified by key by the given value

Writes to the StatsD gauge identified by key

Writes value to the histogram identified by key

Increments the StatsD counter identified by key by the given value

Invoked when the server is started. start_link/3 or start/3 will block until it returns

Measures the execution time of the given function and writes that to the StatsD timing identified by key

Writes the given value to the StatsD set identified by key

Writes the given value to the StatsD timing identified by key

Link to this section Functions

Returns a specification to start this module under a supervisor.

See Supervisor.

Opens the connection to the StatsD-compatible server.

The configuration is read from the configuration for the :statix application (both globally and per connection).

Callback implementation for Statix.connect/0.

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decrement(key, val \\ 1, options \\ []) View Source

Decrements the StatsD counter identified by key by the given value.

Works same as c:increment/3 but subtracts value instead of adding it. For this reason value should be zero or negative.

Examples

iex> MyApp.Statix.decrement("open_connections", 1, [])
:ok

Callback implementation for Statix.decrement/3.

Link to this function

gauge(key, val, options \\ []) View Source

Writes to the StatsD gauge identified by key.

Examples

iex> MyApp.Statix.gauge("cpu_usage", 0.83, [])
:ok

Callback implementation for Statix.gauge/3.

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histogram(key, val, options \\ []) View Source

Writes value to the histogram identified by key.

Not all StatsD-compatible servers support histograms. An example of a such server statsite.

Examples

iex> MyApp.Statix.histogram("online_users", 123, [])
:ok

Callback implementation for Statix.histogram/3.

Link to this function

increment(key, val \\ 1, options \\ []) View Source

Increments the StatsD counter identified by key by the given value.

value is supposed to be zero or positive and c:decrement/3 should be used for negative values.

Examples

iex> MyApp.Statix.increment("hits", 1, [])
:ok

Callback implementation for Statix.increment/3.

Invoked when the server is started. start_link/3 or start/3 will block until it returns.

init_arg is the argument term (second argument) passed to start_link/3.

Returning {:ok, state} will cause start_link/3 to return {:ok, pid} and the process to enter its loop.

Returning {:ok, state, timeout} is similar to {:ok, state} except handle_info(:timeout, state) will be called after timeout milliseconds if no messages are received within the timeout.

Returning {:ok, state, :hibernate} is similar to {:ok, state} except the process is hibernated before entering the loop. See c:handle_call/3 for more information on hibernation.

Returning {:ok, state, {:continue, continue}} is similar to {:ok, state} except that immediately after entering the loop the c:handle_continue/2 callback will be invoked with the value continue as first argument.

Returning :ignore will cause start_link/3 to return :ignore and the process will exit normally without entering the loop or calling c:terminate/2. If used when part of a supervision tree the parent supervisor will not fail to start nor immediately try to restart the GenServer. The remainder of the supervision tree will be started and so the GenServer should not be required by other processes. It can be started later with Supervisor.restart_child/2 as the child specification is saved in the parent supervisor. The main use cases for this are:

  • The GenServer is disabled by configuration but might be enabled later.
  • An error occurred and it will be handled by a different mechanism than the Supervisor. Likely this approach involves calling Supervisor.restart_child/2 after a delay to attempt a restart.

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 c:terminate/2.

Callback implementation for GenServer.init/1.

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measure(key, options \\ [], fun) View Source

Measures the execution time of the given function and writes that to the StatsD timing identified by key.

This function returns the value returned by function, making it suitable for easily wrapping existing code.

Examples

iex> MyApp.Statix.measure("integer_to_string", [], fn -> Integer.to_string(123) end)
"123"

Callback implementation for Statix.measure/3.

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set(key, val, options \\ []) View Source

Writes the given value to the StatsD set identified by key.

Examples

iex> MyApp.Statix.set("unique_visitors", "user1", [])
:ok

Callback implementation for Statix.set/3.

Link to this function

timing(key, val, options \\ []) View Source

Writes the given value to the StatsD timing identified by key.

value is expected in milliseconds.

Examples

iex> MyApp.Statix.timing("rendering", 12, [])
:ok

Callback implementation for Statix.timing/3.