Module: Nearline::Models

Defined in:
lib/nearline/log.rb,
lib/nearline/block.rb,
lib/nearline/schema.rb,
lib/nearline/manifest.rb,
lib/nearline/file_content.rb,
lib/nearline/archived_file.rb

Defined Under Namespace

Classes: ArchivedFile, Block, FileContent, FileFinder, FileSequencer, Log, Manifest, Sequence

Class Method Summary collapse

Class Method Details

.destroy_schema ⇒ Object 



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# File 'lib/nearline/schema.rb', line 6

def destroy_schema
  ActiveRecord::Schema.define do
    drop_table :blocks
    drop_table :file_contents
    drop_table :sequences
    drop_table :archived_files
    drop_table :manifests
    drop_table :archived_files_manifests
    drop_table :logs
  end
end

.empty_schema ⇒ Object 



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# File 'lib/nearline/schema.rb', line 18

def empty_schema
  Nearline::Models::Manifest.destroy_all
end

.generate_schema ⇒ Object 



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# File 'lib/nearline/schema.rb', line 22

def generate_schema
  ActiveRecord::Schema.define do

    create_table :blocks do |t|
      t.column :fingerprint, :string, :length => 40, :null => false
      t.column :bulk_content, :binary
      t.column :is_compressed, :boolean, :default => false
    end
    
    add_index :blocks, [:fingerprint], :unique => true

    create_table :file_contents do |t|
      t.column :fingerprint, :string, :length => 40
      t.column :file_size, :string, :default => 0
      t.column :verified_at, :datetime
    end

    create_table :sequences do |t|
      t.column :sequence, :integer, :null => false
      t.column :block_id, :integer, :null => false
      t.column :file_content_id, :integer, :null => false
    end
    
    add_index :sequences, [:sequence, :file_content_id], :unique => true,
      :name => "sequence_jn_index"

    add_index :sequences, [:block_id]

    create_table :archived_files do |t|
      t.column :system_name, :string, :null => false
      t.column :path, :text, :null => false
      t.column :path_hash, :string, :null => false, :length => 40
      t.column :file_content_id, :integer
      t.column :uid, :integer, :default => -1
      t.column :gid, :integer, :default => -1
      t.column :mtime, :integer, :default => 0
      t.column :mode, :integer, :default => 33206  # "chmod 100666"
      t.column :is_directory, :boolean
    end
    
    add_index :archived_files, [:path_hash], :unique => true
                    
    # Manifests are the reference to a collection of archived files
    create_table :manifests do |t|
      t.column :system_name, :string
      t.column :created_at, :datetime
      t.column :completed_at, :datetime
    end
    
    # Joins archived files across manifests so file references may be recycled
    create_table :archived_files_manifests, :id => false do |t|
      t.column :archived_file_id, :integer
      t.column :manifest_id, :integer
    end

    add_index :archived_files_manifests,
      [:archived_file_id, :manifest_id], {
      :unique => true,
      :name => "manifest_jn_index"
    }
    
    # Keeps a record of problems during backup related to a manifest
    create_table :logs do |t|
      t.column :manifest_id, :integer, :null => false
      t.column :message, :text
      t.column :created_at, :datetime
    end
  end
end