Class: FileStore::SimpleStoreFactory

Inherits:
BaseFactory show all
Defined in:
lib/filestore/factory.rb

Overview

SimpleFileStore factory class

Class Method Summary collapse

Class Method Details

.create(base_path, observable = false, logger = StdoutLogger) ⇒ Object

Creates a simple file-store instance

Arguments:

base_path: The base path directory
observable (optional): Determines wether this instance should support observation
logger (optional): The logging facility

Returns:

A new instance of SimpleFileStore



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# File 'lib/filestore/factory.rb', line 138

def self.create(base_path, observable = false, logger = StdoutLogger)
  store = super(SimpleFileStore, base_path, observable, logger)
  mm = MemoryMetaFactory.create File.join(base_path, MemoryMetaManager::FILE), observable, logger
  
  store.meta_manager = mm
  
  begin
    SimpleStoreFactory.recover_store(store)
  rescue FileStoreException => e
    logger.debug "Couldn't recover store.\nReason: #{e.message}\nTrying to create the store"
    SimpleStoreFactory.create_store(store)
  end
  
  return store
end

.create_store(store) ⇒ Object

Setup for a new file store directory

Arguments:

store: The file store instance to set up



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# File 'lib/filestore/factory.rb', line 160

def self.create_store(store)
  # Try to create needed directories
  begin
    FileUtils.mkdir [store.store_path, store.deleted_path, store.rollback_path]
  rescue Errno::ENOENT => e
    raise FileStoreException, "One ore more system directories couldn't be created.\n#{e.message}"
  end
  #
  # Try to create hidden meta file
  #
  begin
    meta = { 
      :created_at => Date.today.strftime('%d.%m.%Y %H:%M:%S:%L'), 
      :store_path => store.store_path,
      :deleted_path => store.deleted_path,
      :rollback_path => store.rollback_path,
      :created_by => Etc.getlogin
    }
    
    File.open(store.meta_file, "wb+") do |fh|
      YAML.dump(meta, fh)
    end
    #
    # Creation was successful
    #
  rescue Exception => e
    raise FileStoreException, "Store meta file #{store.meta_file} couldn't be created.\n#{e.message}"
  end
end

.recover_store(store) ⇒ Object

Recover an existing file store

Arguments:

store: The file store instance to recover



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# File 'lib/filestore/factory.rb', line 195

def self.recover_store(store)
  # trying to recover existing file store
  begin
    meta = YAML.load_file(store.meta_file)
    
    raise FileStoreException, "Store directory not found" if not File.directory?(meta[:store_path])
    raise FileStoreException, "Deleted directory not found" if not File.directory?(meta[:deleted_path])
    raise FileStoreException, "Rollback directory not found" if not File.directory?(meta[:rollback_path])
    #
    # Recovery was successful
    #
  rescue Exception => e
    raise FileStoreException, "Unable to recover file store from path #{store.root_path}.\n#{e.message}"
  end
end