This commit introduces a new ThreadPool class that provides efficient worker
thread management for background tasks. Key features include:
- Dynamic scaling from min to max threads based on workload
- Proper database connection management in multisite setup
- Graceful shutdown with task completion
- Robust error handling and logging
- FIFO task processing with a managed queue
- Configurable idle timeout for worker threads
The implementation is thoroughly tested, including stress tests, error
scenarios, and multisite compatibility.
Spec was flaky cause work could still be in pipeline after the defer
length is 0. Our length denotes the backlog, not the in progress
count.
This adds a mechanism for gracefully stopping the queue and avoids
wait_for callse
When the thread is aborted, an exception is raised before the `start` of a job is set, and therefore raises an exception in the `ensure` block. This commit checks that `start` exists, and also adds `abort_on_exception=true` so that this issue would have caused test failures.
This will give us some aggregate stats on the defer queue performance.
It is limited to 100 entries (for safety) which is stored in an LRU cache.
Scheduler::Defer.stats can then be used to get an array that denotes:
- number of runs and completions (queued, finished)
- error count (errors)
- total duration (duration)
We can look later at exposing these metrics to gain visibility on the reason
the defer queue is clogged.
It's very easy to forget to add `require 'rails_helper'` at the top of every core/plugin spec file, and omissions can cause some very confusing/sporadic errors.
By setting this flag in `.rspec`, we can remove the need for `require 'rails_helper'` entirely.
