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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more
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Files
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Files
lib/modules/storage/workers/annotation_thumbnail_job.ex
defmodule PhoenixKit.Modules.Storage.AnnotationThumbnailJob do
@moduledoc """
Background (re)generation of a file's baked annotated thumbnail.
Debounced: jobs are unique per `file_uuid` *while still pending or running*
(scheduled / available / executing / retryable) and enqueued with a short
delay, so a burst of annotation edits collapses into a single render. The job
reads the *current* annotations at run time, so it always reflects the latest
state.
Crucially, `:completed` is **not** a unique state: once a regen finishes, the
next edit enqueues a fresh one. (Oban's default unique states include
`:completed`, which would throttle regens to one per `period` per file and
silently drop edits made inside that window — the symptom being "my new shape
didn't show up until I drew another one.")
"""
# The "incomplete" (not-yet-finished) states, computed from the *installed*
# Oban so the list stays valid across versions — `:suspended` exists in some
# Oban releases (2.23) but not others (2.20), and naming the wrong set is a
# hard compile error in the host app. Excluding the terminal states (above
# all `:completed`) is the whole point: a finished regen must never dedup the
# next edit's enqueue.
@unique_states Oban.Job.states() -- [:completed, :cancelled, :discarded]
use Oban.Worker,
queue: :file_processing,
max_attempts: 3,
unique: [period: 120, keys: [:file_uuid], states: @unique_states]
alias PhoenixKit.Modules.Storage.AnnotationThumbnail
# Seconds to wait before rendering, letting a flurry of edits settle.
@debounce_seconds 8
@doc """
Enqueue a debounced annotated-thumbnail refresh for `file_uuid`.
Best-effort: never raises (so it can't break the annotation-save path even if
Oban isn't running). Returns `:ok` regardless.
"""
def enqueue(file_uuid) when is_binary(file_uuid) do
if AnnotationThumbnail.enabled?() do
%{file_uuid: file_uuid}
|> new(schedule_in: @debounce_seconds)
|> Oban.insert()
end
:ok
rescue
_ -> :ok
end
@impl Oban.Worker
def perform(%Oban.Job{args: %{"file_uuid" => file_uuid}}) do
case AnnotationThumbnail.refresh(file_uuid) do
{:ok, _} -> :ok
{:error, reason} -> {:error, reason}
end
end
end