Class: Google::Cloud::Gemserver::Backend::StorageSync

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Includes:
Concurrent::Async, Singleton
Defined in:
lib/google/cloud/gemserver/backend/storage_sync.rb

Overview

Storage Sync

A set of methods that manage syncing files between the local file system that the gemserver runs on (a container on Google App Engine) and Google Cloud Storage. By doing so, when the gemserver is restarted , for whatever reason, the gems pushed to the gemserver will persist. Without such a system in place all gems / files on the gemserver will be lost as it runs on a container.

Constant Summary collapse

DIR_LOCK =

A lock to ensure the .gemstash directory, used to store gem files, is created atomically.

File.expand_path("~/gemstash_dir").freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ StorageSync

Creates an instance of the Singleton StorageSync class with a background thread and asynchronous components to run methods asynchronously.



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# File 'lib/google/cloud/gemserver/backend/storage_sync.rb', line 64

def initialize
  super
end

Class Method Details

.instance ⇒ Object

Delegate the run and download_service methods to the Singleton via .instance.



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# File 'lib/google/cloud/gemserver/backend/storage_sync.rb', line 56

def_delegators :instance, :run, :upload_service, :download_service,
:try_upload, :try_download, :file_changed?

Instance Method Details

#run ⇒ Object

Runs a background gem files syncing service to ensure they are up to date with respect to the files on Google Cloud Storage. This allows allow the gem metadata on the gemserver (in the container) to persist in case of situations where the gemserver goes down.



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# File 'lib/google/cloud/gemserver/backend/storage_sync.rb', line 73

def run
  async.sync
end