Class: Kaal::Internal::Sequel::DatabaseBackend

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

Overview

Shared table-backed Sequel SQL engine used by the public SQLite backend.

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(database, namespace: nil) ⇒ DatabaseBackend

Returns a new instance of DatabaseBackend.



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# File 'lib/kaal/internal/sequel/database_backend.rb', line 17

def initialize(database, namespace: nil)
  super()
  @database = Kaal::Persistence::Database.new(database)
  @namespace = namespace
end

Instance Method Details

#acquire(key, ttl) ⇒ Object 



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# File 'lib/kaal/internal/sequel/database_backend.rb', line 31

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

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

    begin
      dataset.insert(key: key, acquired_at: now, expires_at: expires_at)
      log_dispatch_attempt(key)
      return true
    rescue ::Sequel::UniqueConstraintViolation
      next
    end
  end

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

#cleanup_expired_locks ⇒ Object 



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# File 'lib/kaal/internal/sequel/database_backend.rb', line 58

def cleanup_expired_locks
  dataset.where { expires_at < Time.now.utc }.delete
end

#definition_registry ⇒ Object 



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# File 'lib/kaal/internal/sequel/database_backend.rb', line 27

def definition_registry
  @definition_registry ||= Kaal::Definition::DatabaseEngine.new(database: @database.connection)
end

#dispatch_registry ⇒ Object 



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# File 'lib/kaal/internal/sequel/database_backend.rb', line 23

def dispatch_registry
  @dispatch_registry ||= Kaal::Dispatch::DatabaseEngine.new(database: @database.connection, namespace: resolved_namespace)
end

#release(key) ⇒ Object 



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# File 'lib/kaal/internal/sequel/database_backend.rb', line 52

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