Class: Longleaf::StorageLocationManager

Inherits:
Object
  • Object
show all
Defined in:
lib/longleaf/services/storage_location_manager.rb

Overview

Manager which loads and provides access to StorageLocation objects

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ StorageLocationManager

Returns a new instance of StorageLocationManager.

Parameters:

  • config (Hash) —

    has representation of the application configuration

Raises:

  • (ArgumentError) 


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# File 'lib/longleaf/services/storage_location_manager.rb', line 14

def initialize(config)
  raise ArgumentError.new("Configuration must be provided") if config&.empty?

  @locations = Hash.new
  config[AF::LOCATIONS].each do |name, properties|
    path = properties[AF::LOCATION_PATH]
    md_path = properties[AF::METADATA_PATH]
    md_digests = properties[AF::METADATA_DIGESTS]
    location = Longleaf::StorageLocation.new(name: name,
        path: path,
        metadata_path: md_path,
        metadata_digests: md_digests)

    @locations[name] = location
  end
  @locations.freeze
end

Instance Attribute Details

#locations ⇒ Object (readonly)

Hash mapping storage location names to Longleaf::StorageLocation objects



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# File 'lib/longleaf/services/storage_location_manager.rb', line 11

def locations
  @locations
end

Instance Method Details

#get_location_by_metadata_path(md_path) ⇒ Longleaf::StorageLocation

Get the Longleaf::StorageLocation object which should contain the given metadata path

Returns:

  • (Longleaf::StorageLocation) —

    location containing the given metadata path or nil if the path is not contained by a registered location.

Raises:

  • (ArgumentError) 


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# File 'lib/longleaf/services/storage_location_manager.rb', line 47

def get_location_by_metadata_path(md_path)
  raise ArgumentError.new("Metadata path parameter is required") if md_path.nil? || md_path.empty?
  @locations.each do |name, location|
    return location if md_path.start_with?(location.metadata_path)
  end

  nil
end

#get_location_by_path(path) ⇒ Longleaf::StorageLocation

Get the Longleaf::StorageLocation object which should contain the given path

Returns:

  • (Longleaf::StorageLocation) —

    location containing the given path or nil if the path is not contained by a registered location.

Raises:

  • (ArgumentError) 


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# File 'lib/longleaf/services/storage_location_manager.rb', line 35

def get_location_by_path(path)
  raise ArgumentError.new("Path parameter is required") if path.nil? || path.empty?
  @locations.each do |name, location|
    return location if path.start_with?(location.path)
  end

  nil
end

#verify_path_in_location(path, expected_loc = nil) ⇒ StorageLocation

Raises a Longleaf::StorageLocationUnavailableError if the given path is not in a known storage location,

or if it is not within the expected location if provided

Parameters:

  • path (String) —

    file path

  • expected_loc (String) (defaults to: nil) —

    name of the storage location which path should be contained by

Returns:

  • (StorageLocation) —

    the storage location which contains path, if it was within one.

Raises:



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# File 'lib/longleaf/services/storage_location_manager.rb', line 62

def verify_path_in_location(path, expected_loc = nil)
  location = get_location_by_path(path)
  if location.nil?
    raise StorageLocationUnavailableError.new("Path #{path} is not from a known storage location.")
  elsif !expected_loc.nil? && expected_loc != location.name
    raise StorageLocationUnavailableError.new("Path #{path} is not contained by storage location #{expected_loc}.")
  end
  location
end