Class: Soba::Infrastructure::LockManager

Inherits:
Object
  • Object
show all
Defined in:
lib/soba/infrastructure/lock_manager.rb

Constant Summary collapse

DEFAULT_TIMEOUT =

seconds

5
DEFAULT_STALE_THRESHOLD =

5 minutes

300
RETRY_INTERVAL =

seconds

0.1

Instance Method Summary collapse

Constructor Details

#initialize(lock_directory: nil) ⇒ LockManager

Returns a new instance of LockManager.



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# File 'lib/soba/infrastructure/lock_manager.rb', line 15

def initialize(lock_directory: nil)
  @lock_directory = lock_directory || default_lock_directory
  ensure_lock_directory_exists
end

Instance Method Details

#acquire_lock(resource_name, timeout: 0, stale_threshold: DEFAULT_STALE_THRESHOLD) ⇒ Object 



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# File 'lib/soba/infrastructure/lock_manager.rb', line 20

def acquire_lock(resource_name, timeout: 0, stale_threshold: DEFAULT_STALE_THRESHOLD)
  lock_file = lock_file_path(resource_name)
  deadline = Time.now + timeout if timeout > 0

  loop do
    # Check for stale lock
    if File.exist?(lock_file) && stale_threshold > 0
      begin
        if Time.now - File.mtime(lock_file) > stale_threshold
          # Remove stale lock
          File.delete(lock_file)
        end
      rescue Errno::ENOENT
        # File was deleted by another process, continue
      rescue
        # Other errors, ignore and continue
      end
    end

    # Try to acquire lock
    begin
      File.open(lock_file, File::WRONLY | File::CREAT | File::EXCL) do |f|
        f.write(Process.pid.to_s)
      end
      return true
    rescue Errno::EEXIST
      # Lock already exists
      if timeout > 0 && Time.now < deadline
        sleep RETRY_INTERVAL
        next
      else
        return false
      end
    end
  end
end

#cleanup_stale_locks(threshold: DEFAULT_STALE_THRESHOLD) ⇒ Object 



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# File 'lib/soba/infrastructure/lock_manager.rb', line 96

def cleanup_stale_locks(threshold: DEFAULT_STALE_THRESHOLD)
  return [] unless Dir.exist?(@lock_directory)

  removed = []
  Dir.glob(File.join(@lock_directory, '*.lock')).each do |lock_file|
    if Time.now - File.mtime(lock_file) > threshold
      begin
        File.delete(lock_file)
      rescue
        nil
      end
      removed << File.basename(lock_file, '.lock')
    end
  end

  removed
end

#locked?(resource_name) ⇒ Boolean

Returns:



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# File 'lib/soba/infrastructure/lock_manager.rb', line 91

def locked?(resource_name)
  lock_file = lock_file_path(resource_name)
  File.exist?(lock_file)
end

#release_lock(resource_name) ⇒ Object 



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# File 'lib/soba/infrastructure/lock_manager.rb', line 57

def release_lock(resource_name)
  lock_file = lock_file_path(resource_name)

  return false unless File.exist?(lock_file)

  # Check if we own the lock
  begin
    pid = File.read(lock_file).strip.to_i
    if pid == Process.pid
      File.delete(lock_file)
      return true
    end
  rescue Errno::ENOENT
    # File was already deleted
    return false
  rescue StandardError
    # Error reading file
  end

  false
end

#with_lock(resource_name, timeout: DEFAULT_TIMEOUT, stale_threshold: DEFAULT_STALE_THRESHOLD) ⇒ Object 



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# File 'lib/soba/infrastructure/lock_manager.rb', line 79

def with_lock(resource_name, timeout: DEFAULT_TIMEOUT, stale_threshold: DEFAULT_STALE_THRESHOLD)
  unless acquire_lock(resource_name, timeout: timeout, stale_threshold: stale_threshold)
    raise LockTimeoutError, "Failed to acquire lock for #{resource_name} within #{timeout} seconds"
  end

  begin
    yield
  ensure
    release_lock(resource_name)
  end
end