Class: Kaal::Internal::ActiveRecord::DatabaseBackend

Inherits:
Backend::Adapter show all
Includes:
Backend::DispatchLogging
Defined in:
lib/kaal/internal/active_record/database_backend.rb

Overview

Table-backed lock engine used for SQLite-style Active Record storage.

Instance Method Summary collapse

Methods included from Backend::DispatchLogging

#log_dispatch_attempt, #parse_lock_key, parse_lock_key

Methods inherited from Backend::Adapter

#with_lock

Constructor Details

#initialize(connection = nil, lock_model: LockRecord, dispatch_registry: nil, definition_registry: nil, namespace: nil) ⇒ DatabaseBackend

Returns a new instance of DatabaseBackend.



17
18
19
20
21
22
23
24
 
# File 'lib/kaal/internal/active_record/database_backend.rb', line 17

def initialize(connection = nil, lock_model: LockRecord, dispatch_registry: nil, definition_registry: nil, namespace: nil)
  super()
  ConnectionSupport.configure!(connection)
  @lock_model = lock_model
  @dispatch_registry = dispatch_registry
  @definition_registry = definition_registry
  @namespace = namespace
end

Instance Method Details

#acquire(key, ttl) ⇒ Object 



34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
 
# File 'lib/kaal/internal/active_record/database_backend.rb', line 34

def acquire(key, ttl)
  now = Time.now.utc
  expires_at = now + ttl

  2.times do |attempt|
    cleanup_expired_locks if attempt.positive?

    begin
      @lock_model.create!(key: key, acquired_at: now, expires_at: expires_at)
      log_dispatch_attempt(key)
      return true
    rescue ::ActiveRecord::RecordNotUnique
      next
    end
  end

  false
rescue StandardError => e
  raise Kaal::Backend::LockAdapterError, "Database acquire failed for #{key}: #{e.message}"
end

#cleanup_expired_locks ⇒ Object 



61
62
63
 
# File 'lib/kaal/internal/active_record/database_backend.rb', line 61

def cleanup_expired_locks
  @lock_model.where(expires_at: ...Time.now.utc).delete_all
end

#definition_registry ⇒ Object 



30
31
32
 
# File 'lib/kaal/internal/active_record/database_backend.rb', line 30

def definition_registry
  @definition_registry ||= DefinitionRegistry.new
end

#dispatch_registry ⇒ Object 



26
27
28
 
# File 'lib/kaal/internal/active_record/database_backend.rb', line 26

def dispatch_registry
  @dispatch_registry ||= DispatchRegistry.new(namespace: resolved_namespace)
end

#release(key) ⇒ Object 



55
56
57
58
59
 
# File 'lib/kaal/internal/active_record/database_backend.rb', line 55

def release(key)
  @lock_model.where(key: key).delete_all.positive?
rescue StandardError => e
  raise Kaal::Backend::LockAdapterError, "Database release failed for #{key}: #{e.message}"
end