Class: ODBA::Storage

Inherits:
Object show all
Includes:
Singleton
Defined in:
lib/odba/storage.rb

Overview

:nodoc: all

Constant Summary collapse

BULK_FETCH_STEP = 
2500
TABLES = 
[
  # in table 'object', the isolated dumps of all objects are stored
  ['object', <<-'SQL'],
  ['prefetchable_index', <<-SQL],
  ['extent_index', <<-SQL],
CREATE INDEX IF NOT EXISTS extent_index ON object(extent);
  SQL
  # helper table 'object_connection'
  ['object_connection', <<-'SQL'],
  ['target_id_index', <<-SQL],
CREATE INDEX IF NOT EXISTS target_id_index ON object_connection(target_id);
  SQL
  # helper table 'collection'
  ['collection', <<-'SQL'],
]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Storage

Returns a new instance of Storage.



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# File 'lib/odba/storage.rb', line 48

def initialize
	@id_mutex = Mutex.new
end

Instance Attribute Details

#dbi ⇒ Object 



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# File 'lib/odba/storage.rb', line 204

def dbi
	Thread.current[:txn] || @dbi
end

Instance Method Details

#bulk_restore(bulk_fetch_ids) ⇒ Object 



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# File 'lib/odba/storage.rb', line 51

def bulk_restore(bulk_fetch_ids)
	if(bulk_fetch_ids.empty?)
		[]
	else
		bulk_fetch_ids = bulk_fetch_ids.uniq
		rows = []
		while(!(ids = bulk_fetch_ids.slice!(0, BULK_FETCH_STEP)).empty?)
			sql = <<-SQL
				SELECT odba_id, content FROM object 
				WHERE odba_id IN (#{ids.join(',')})
			SQL
			rows.concat(self.dbi.select_all(sql))
		end
		rows
	end
end

#collection_fetch(odba_id, key_dump) ⇒ Object 



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# File 'lib/odba/storage.rb', line 67

def collection_fetch(odba_id, key_dump)
  sql = <<-SQL
    SELECT value FROM collection 
    WHERE odba_id = ? AND key = ?
  SQL
  row = self.dbi.select_one(sql, odba_id, key_dump)
  row.first unless row.nil?
end

#collection_remove(odba_id, key_dump) ⇒ Object 



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# File 'lib/odba/storage.rb', line 75

def collection_remove(odba_id, key_dump)
  self.dbi.do <<-SQL, odba_id, key_dump
    DELETE FROM collection
    WHERE odba_id = ? AND key = ?
  SQL
end

#collection_store(odba_id, key_dump, value_dump) ⇒ Object 



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# File 'lib/odba/storage.rb', line 81

def collection_store(odba_id, key_dump, value_dump)
  self.dbi.do <<-SQL, odba_id, key_dump, value_dump
    INSERT INTO collection (odba_id, key, value)
    VALUES (?, ?, ?)
  SQL
end

#condition_index_delete(index_name, origin_id, search_terms, target_id = nil) ⇒ Object 



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# File 'lib/odba/storage.rb', line 87

def condition_index_delete(index_name, origin_id, 
                           search_terms, target_id=nil)
  values = []
  sql = "DELETE FROM #{index_name}"
  if(origin_id)
    sql << " WHERE origin_id = ?"
  else
    sql << " WHERE origin_id IS ?"
  end
  search_terms.each { |key, value|
    sql << " AND %s = ?" % key
    values << value
  }
  if(target_id)
    sql << " AND target_id = ?"
    values << target_id
  end
  self.dbi.do sql, origin_id, *values
end

#condition_index_ids(index_name, id, id_name) ⇒ Object 



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# File 'lib/odba/storage.rb', line 106

def condition_index_ids(index_name, id, id_name)
  sql = <<-SQL
    SELECT DISTINCT *
    FROM #{index_name}
    WHERE #{id_name}=?
  SQL
  self.dbi.select_all(sql, id)
end

#create_condition_index(table_name, definition) ⇒ Object 



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# File 'lib/odba/storage.rb', line 136

def create_condition_index(table_name, definition)
  self.dbi.do <<-SQL
CREATE TABLE IF NOT EXISTS #{table_name} (
  origin_id INTEGER,
  #{definition.collect { |*pair| pair.join(' ') }.join(",\n  ") },
  target_id INTEGER
);
  SQL
  #index origin_id
  self.dbi.do <<-SQL
CREATE INDEX IF NOT EXISTS origin_id_#{table_name} ON #{table_name}(origin_id);
  SQL
  #index search_term
  definition.each { |name, datatype|
    self.dbi.do <<-SQL
CREATE INDEX IF NOT EXISTS #{name}_#{table_name} ON #{table_name}(#{name});
    SQL
  }
  #index target_id
  self.dbi.do <<-SQL
CREATE INDEX IF NOT EXISTS target_id_#{table_name} ON #{table_name}(target_id);
  SQL
end

#create_dictionary_map(language) ⇒ Object 



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# File 'lib/odba/storage.rb', line 114

def create_dictionary_map(language)
  self.dbi.do <<-SQL
    ALTER TEXT SEARCH CONFIGURATION default_#{language}
    ALTER MAPPING FOR
      asciiword, asciihword, hword_asciipart,
      word, hword, hword_part, hword_numpart,
      numword, numhword
    WITH #{language}_ispell, #{language}_stem;
  SQL
  self.dbi.do <<-SQL
    ALTER TEXT SEARCH CONFIGURATION default_#{language}
    ALTER MAPPING FOR
      host, file, int, uint, version
    WITH simple;
  SQL
  # drop from default setting
  self.dbi.do <<-SQL
  ALTER TEXT SEARCH CONFIGURATION default_#{language}
      DROP MAPPING FOR
      email, url, url_path, sfloat, float
  SQL
end

#create_fulltext_index(table_name) ⇒ Object 



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# File 'lib/odba/storage.rb', line 159

def create_fulltext_index(table_name)
  self.dbi.do <<-SQL
CREATE TABLE IF NOT EXISTS #{table_name} (
  origin_id INTEGER,
  search_term tsvector,
  target_id INTEGER
);
  SQL
  #index origin_id
  self.dbi.do <<-SQL
CREATE INDEX IF NOT EXISTS origin_id_#{table_name} ON #{table_name}(origin_id);
  SQL
  self.dbi.do <<-SQL
CREATE INDEX IF NOT EXISTS search_term_#{table_name}
ON #{table_name} USING gist(search_term);
  SQL
  #index target_id
  self.dbi.do <<-SQL
CREATE INDEX IF NOT EXISTS target_id_#{table_name} ON #{table_name}(target_id);
  SQL
end

#create_index(table_name) ⇒ Object 



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# File 'lib/odba/storage.rb', line 180

def create_index(table_name)
  self.dbi.do <<-SQL
    CREATE TABLE IF NOT EXISTS #{table_name} (
      origin_id INTEGER,
      search_term TEXT,
      target_id INTEGER
    );
  SQL
  #index origin_id
  self.dbi.do <<-SQL
    CREATE INDEX IF NOT EXISTS origin_id_#{table_name}
    ON #{table_name}(origin_id)
  SQL
  #index search_term
  self.dbi.do <<-SQL
    CREATE INDEX IF NOT EXISTS search_term_#{table_name}
    ON #{table_name}(search_term)
  SQL
  #index target_id
  self.dbi.do <<-SQL
    CREATE INDEX IF NOT EXISTS target_id_#{table_name}
    ON #{table_name}(target_id)
  SQL
end

#delete_index_element(index_name, odba_id, id_name) ⇒ Object 



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# File 'lib/odba/storage.rb', line 210

def delete_index_element(index_name, odba_id, id_name)
  self.dbi.do <<-SQL, odba_id
    DELETE FROM #{index_name} WHERE #{id_name} = ?
  SQL
end

#delete_persistable(odba_id) ⇒ Object 



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# File 'lib/odba/storage.rb', line 215

def delete_persistable(odba_id)
    # delete origin from connections
	self.dbi.do <<-SQL, odba_id
		DELETE FROM object_connection WHERE origin_id = ?
	SQL
    # delete target from connections
	self.dbi.do <<-SQL, odba_id
		DELETE FROM object_connection WHERE target_id = ?
	SQL
    # delete from collections
	self.dbi.do <<-SQL, odba_id
		DELETE FROM collection WHERE odba_id = ?
	SQL
    # delete from objects
	self.dbi.do <<-SQL, odba_id
		DELETE FROM object WHERE odba_id = ?
	SQL
end

#drop_index(index_name) ⇒ Object 



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# File 'lib/odba/storage.rb', line 207

def drop_index(index_name)
	self.dbi.do "DROP TABLE #{index_name}"
end

#ensure_object_connections(origin_id, target_ids) ⇒ Object 



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# File 'lib/odba/storage.rb', line 233

def ensure_object_connections(origin_id, target_ids)
  sql = <<-SQL
    SELECT target_id FROM object_connection
    WHERE origin_id = ?
  SQL
  target_ids.uniq!
  update_ids = target_ids
  old_ids = []
  ## use self.dbi instead of @dbi to get information about
  ## object_connections previously stored within this transaction
  if(rows = self.dbi.select_all(sql, origin_id))
    old_ids = rows.collect { |row| row[0] }
    old_ids.uniq!
    delete_ids = old_ids - target_ids
    update_ids = target_ids - old_ids
    unless(delete_ids.empty?)
      while(!(ids = delete_ids.slice!(0, BULK_FETCH_STEP)).empty?)
        self.dbi.do <<-SQL, origin_id
          DELETE FROM object_connection
          WHERE origin_id = ? AND target_id IN (#{ids.join(',')})
        SQL
      end
    end
  end
  sth = self.dbi.prepare <<-SQL
    INSERT INTO object_connection (origin_id, target_id)
    VALUES (?, ?)
  SQL
  update_ids.each { |id|
    sth.execute(origin_id, id)
  }
  sth.finish
end

#ensure_target_id_index(table_name) ⇒ Object 



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# File 'lib/odba/storage.rb', line 266

def ensure_target_id_index(table_name)
  #index target_id
  self.dbi.do <<-SQL
    CREATE INDEX IF NOT EXISTS target_id_#{table_name}
    ON #{table_name}(target_id)
  SQL
rescue
end

#extent_count(klass) ⇒ Object 



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# File 'lib/odba/storage.rb', line 274

def extent_count(klass)
  self.dbi.select_one(<<-EOQ, klass.to_s).first
    SELECT COUNT(odba_id) FROM object WHERE extent = ?
  EOQ
end

#extent_ids(klass) ⇒ Object 



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# File 'lib/odba/storage.rb', line 279

def extent_ids(klass)
  self.dbi.select_all(<<-EOQ, klass.to_s).flatten
    SELECT odba_id FROM object WHERE extent = ?
  EOQ
end

#fulltext_index_delete(index_name, id, id_name) ⇒ Object 



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# File 'lib/odba/storage.rb', line 284

def fulltext_index_delete(index_name, id, id_name)
  self.dbi.do <<-SQL, id
    DELETE FROM #{index_name}
    WHERE #{id_name} = ?
  SQL
end

#fulltext_index_target_ids(index_name, origin_id) ⇒ Object 



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# File 'lib/odba/storage.rb', line 293

def fulltext_index_target_ids(index_name, origin_id)
  sql = <<-SQL
    SELECT DISTINCT target_id
    FROM #{index_name}
    WHERE origin_id=?
  SQL
  self.dbi.select_all(sql, origin_id)
end

#generate_dictionary(language) ⇒ Object 



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# File 'lib/odba/storage.rb', line 301

def generate_dictionary(language)
  # postgres searches for the dictionary file in the directory share/tsearch_data of it installation location
  # By default under gentoo, this is /usr/share/postgresql/tsearch_data/
  # As we have no way to get the current installation path, we do not check whether the files are present or not
  file='fulltext'
  # setup configuration
  self.dbi.do <<-SQL
    CREATE TEXT SEARCH CONFIGURATION public.default_#{language} ( COPY = pg_catalog.#{language} );
  SQL
  # ispell
  self.dbi.do <<-SQL
    CREATE TEXT SEARCH DICTIONARY #{language}_ispell (
      TEMPLATE  = ispell,
      DictFile  = #{language}_#{file},
      AffFile   = #{language}_#{file},
      StopWords = #{language}_#{file}
    );
  SQL
  # stem is already there.
  create_dictionary_map(language)
end

#get_server_version ⇒ Object 



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# File 'lib/odba/storage.rb', line 290

def get_server_version
  /\s([\d\.]+)\s/.match(self.dbi.select_all("select version();").first.first)[1]
end

#index_delete_origin(index_name, odba_id, term) ⇒ Object 



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# File 'lib/odba/storage.rb', line 322

def index_delete_origin(index_name, odba_id, term)
  self.dbi.do <<-SQL, odba_id, term
    DELETE FROM #{index_name} 
    WHERE origin_id = ?
    AND search_term = ?
  SQL
end

#index_delete_target(index_name, origin_id, search_term, target_id) ⇒ Object 



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# File 'lib/odba/storage.rb', line 329

def index_delete_target(index_name, origin_id, search_term, target_id)
  self.dbi.do <<-SQL, origin_id, search_term, target_id
    DELETE FROM #{index_name} 
    WHERE origin_id = ?
    AND search_term = ?
    AND target_id = ?
  SQL
end

#index_fetch_keys(index_name, length = nil) ⇒ Object 



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# File 'lib/odba/storage.rb', line 337

def index_fetch_keys(index_name, length=nil)
  expr = if(length)
           "substr(search_term, 1, #{length})"
         else
           "search_term"
         end
  sql = <<-SQL
    SELECT DISTINCT #{expr} AS key
    FROM #{index_name}
    ORDER BY key
  SQL
  self.dbi.select_all(sql).flatten
end

#index_matches(index_name, substring, limit = nil, offset = 0) ⇒ Object 



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# File 'lib/odba/storage.rb', line 350

def index_matches(index_name, substring, limit=nil, offset=0)
  sql = <<-SQL
    SELECT DISTINCT search_term AS key
    FROM #{index_name}
    WHERE search_term LIKE ?
    ORDER BY key
  SQL
  if limit
    sql << "LIMIT #{limit}\n"
  end
  if offset > 0
    sql << "OFFSET #{offset}\n"
  end
  self.dbi.select_all(sql, substring + '%').flatten
end

#index_origin_ids(index_name, target_id) ⇒ Object 



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# File 'lib/odba/storage.rb', line 365

def index_origin_ids(index_name, target_id)
  sql = <<-SQL
    SELECT DISTINCT origin_id, search_term
    FROM #{index_name}
    WHERE target_id=?
  SQL
  self.dbi.select_all(sql, target_id)
end

#index_target_ids(index_name, origin_id) ⇒ Object 



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# File 'lib/odba/storage.rb', line 373

def index_target_ids(index_name, origin_id)
  sql = <<-SQL
    SELECT DISTINCT target_id, search_term
    FROM #{index_name}
    WHERE origin_id=?
  SQL
  self.dbi.select_all(sql, origin_id)
end

#max_id ⇒ Object 



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# File 'lib/odba/storage.rb', line 381

def max_id
  @id_mutex.synchronize do
    ensure_next_id_set
    @next_id
  end
end

#next_id ⇒ Object 



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# File 'lib/odba/storage.rb', line 387

def next_id
  @id_mutex.synchronize do
    ensure_next_id_set
    @next_id += 1
  end
end

#remove_dictionary(language) ⇒ Object 



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# File 'lib/odba/storage.rb', line 409

def remove_dictionary(language)
  # remove configuration
  self.dbi.do <<-SQL
    DROP TEXT SEARCH CONFIGURATION IF EXISTS default_#{language}
  SQL
  # remove ispell dictionaries
  self.dbi.do <<-SQL
    DROP TEXT SEARCH DICTIONARY IF EXISTS #{language}_ispell;
  SQL
end

#reserve_next_id(reserved_id) ⇒ Object 



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# File 'lib/odba/storage.rb', line 398

def reserve_next_id(reserved_id)
  @id_mutex.synchronize do
    ensure_next_id_set
    if @next_id < reserved_id
      @next_id = reserved_id
    else
      raise OdbaDuplicateIdError,
            "The id '#{reserved_id}' has already been assigned"
    end
  end
end

#restore(odba_id) ⇒ Object 



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# File 'lib/odba/storage.rb', line 419

def restore(odba_id)
	row = self.dbi.select_one("SELECT content FROM object WHERE odba_id = ?", odba_id)
	row.first unless row.nil?
end

#restore_collection(odba_id) ⇒ Object 



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# File 'lib/odba/storage.rb', line 503

def restore_collection(odba_id)
	self.dbi.select_all <<-EOQ
		SELECT key, value FROM collection WHERE odba_id = #{odba_id}
	EOQ
end

#restore_named(name) ⇒ Object 



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# File 'lib/odba/storage.rb', line 508

def restore_named(name)
	row = self.dbi.select_one("SELECT content FROM object WHERE name = ?", 
		name)
	row.first unless row.nil?
end

#restore_prefetchable ⇒ Object 



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# File 'lib/odba/storage.rb', line 513

def restore_prefetchable
	self.dbi.select_all <<-EOQ
		SELECT odba_id, content FROM object WHERE prefetchable = true
	EOQ
end

#retrieve_connected_objects(target_id) ⇒ Object 



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# File 'lib/odba/storage.rb', line 423

def retrieve_connected_objects(target_id)
	sql = <<-SQL 
		SELECT origin_id FROM object_connection 
		WHERE target_id = ?
	SQL
	self.dbi.select_all(sql, target_id)
end

#retrieve_from_condition_index(index_name, conditions, limit = nil) ⇒ Object 



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# File 'lib/odba/storage.rb', line 430

def retrieve_from_condition_index(index_name, conditions, limit=nil)
  sql = <<-EOQ
    SELECT target_id, COUNT(target_id) AS relevance
    FROM #{index_name}
    WHERE TRUE
  EOQ
  values = []
  lines = conditions.collect { |name, info|
    val = nil
    condition = nil
    if(info.is_a?(Hash))
      condition = info['condition']
      if(val = info['value']) 
        if(/i?like/i.match(condition))
          val += '%'
        end
        condition = "#{condition || '='} ?"
        values.push(val.to_s)
      end
    elsif(info)
      condition = "= ?"
      values.push(info.to_s)
    end
    sql << <<-EOQ
      AND #{name} #{condition || 'IS NULL'}
    EOQ
  }
  sql << "        GROUP BY target_id\n"
  if(limit)
    sql << " LIMIT #{limit}"
  end
  self.dbi.select_all(sql, *values)
end

#retrieve_from_fulltext_index(index_name, search_term, dict, limit = nil) ⇒ Object 



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# File 'lib/odba/storage.rb', line 463

def retrieve_from_fulltext_index(index_name, search_term, dict, limit=nil)
    ## this combination of gsub statements solves the problem of 
    #  properly escaping strings of this form: "(2:1)" into 
    #  '\(2\:1\)' (see test_retrieve_from_fulltext_index)
	term = search_term.strip.gsub(/\s+/, '&').gsub(/&+/, '&')\
      .gsub(/[():]/i, '\\ \\&').gsub(/\s/, '')
   sql = <<-EOQ
		SELECT target_id, 
			max(ts_rank(search_term, to_tsquery(?, ?))) AS relevance
		FROM #{index_name} 
		WHERE search_term @@ to_tsquery(?, ?) 
		GROUP BY target_id
		ORDER BY relevance DESC
	EOQ
    if(limit)
      sql << " LIMIT #{limit}"
    end
	self.dbi.select_all(sql, dict, term, dict, term)
rescue DBI::ProgrammingError => e
	warn("ODBA::Storage.retrieve_from_fulltext_index rescued a DBI::ProgrammingError(#{e.message}). Query:")
	warn("self.dbi.select_all(#{sql}, #{dict}, #{term}, #{dict}, #{term})")
	warn("returning empty result")
	[]
end

#retrieve_from_index(index_name, search_term, exact = nil, limit = nil) ⇒ Object 



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# File 'lib/odba/storage.rb', line 487

def retrieve_from_index(index_name, search_term, 
                        exact=nil, limit=nil)
  unless(exact)
    search_term = search_term + "%"
  end
  sql = <<-EOQ
    SELECT target_id, COUNT(target_id) AS relevance
    FROM #{index_name}
    WHERE search_term LIKE ?
    GROUP BY target_id
  EOQ
  if(limit)
    sql << " LIMIT #{limit}"
  end
  self.dbi.select_all(sql, search_term)	 
end

#setup ⇒ Object 



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# File 'lib/odba/storage.rb', line 518

def setup
  TABLES.each { |name, definition|
    self.dbi.do(definition) rescue DBI::ProgrammingError
  }
  unless(self.dbi.columns('object').any? { |col| col.name == 'extent' })
    self.dbi.do <<-EOS
ALTER TABLE object ADD COLUMN extent TEXT;
CREATE INDEX IF NOT EXISTS extent_index ON object(extent);
    EOS
  end
end

#store(odba_id, dump, name, prefetchable, klass) ⇒ Object 



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# File 'lib/odba/storage.rb', line 529

def store(odba_id, dump, name, prefetchable, klass)
	sql = "SELECT name FROM object WHERE odba_id = ?"
	if(row = self.dbi.select_one(sql, odba_id))
		name ||= row['name']
		self.dbi.do <<-SQL, dump, name, prefetchable, klass.to_s, odba_id
			UPDATE object SET 
			content = ?,
			name = ?,
			prefetchable = ?,
        extent = ?
			WHERE odba_id = ?
		SQL
	else
		self.dbi.do <<-SQL, odba_id, dump, name, prefetchable, klass.to_s
			INSERT INTO object (odba_id, content, name, prefetchable, extent)
			VALUES (?, ?, ?, ?, ?)
		SQL
	end
end

#transaction(&block) ⇒ Object 



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# File 'lib/odba/storage.rb', line 548

def transaction(&block)
	dbi = nil
	retval = nil
	@dbi.transaction { |dbi|
      ## this should not be necessary anymore:
		#dbi['AutoCommit'] = false
		Thread.current[:txn] = dbi
		retval = block.call
	}
	retval
ensure
    ## this should not be necessary anymore:
	#dbi['AutoCommit'] = true
	Thread.current[:txn] = nil
end

#update_condition_index(index_name, origin_id, search_terms, target_id) ⇒ Object 



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# File 'lib/odba/storage.rb', line 563

def update_condition_index(index_name, origin_id, search_terms, target_id)
  keys = []
  vals = []
  search_terms.each { |key, val|
    keys.push(key)
    vals.push(val)
  }
  if(target_id)
    self.dbi.do <<-SQL, origin_id, target_id, *vals
INSERT INTO #{index_name} (origin_id, target_id, #{keys.join(', ')})
VALUES (?, ?#{', ?' * keys.size})
    SQL
  else
    key_str = keys.collect { |key| "#{key}=?" }.join(', ')
    self.dbi.do <<-SQL, *(vals.push(origin_id))
UPDATE #{index_name} SET #{key_str}
WHERE origin_id = ?
    SQL
  end
end

#update_fulltext_index(index_name, origin_id, search_term, target_id, dict) ⇒ Object 



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# File 'lib/odba/storage.rb', line 583

def update_fulltext_index(index_name, origin_id, search_term, target_id, dict)
  search_term = search_term.gsub(/\s+/, ' ').strip
  if(target_id)
    self.dbi.do <<-SQL, origin_id, dict, search_term, target_id
INSERT INTO #{index_name} (origin_id, search_term, target_id)
VALUES (?, to_tsvector(?, ?), ?)
    SQL
  else
    self.dbi.do <<-SQL, dict, search_term, origin_id
UPDATE #{index_name} SET search_term=to_tsvector(?, ?)
WHERE origin_id=?
    SQL
  end
end

#update_index(index_name, origin_id, search_term, target_id) ⇒ Object 



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# File 'lib/odba/storage.rb', line 597

def update_index(index_name, origin_id, search_term, target_id)
    if(target_id)
      self.dbi.do <<-SQL, origin_id, search_term, target_id
        INSERT INTO #{index_name} (origin_id, search_term, target_id) 
        VALUES (?, ?, ?)
      SQL
    else
      self.dbi.do <<-SQL, search_term, origin_id
        UPDATE #{index_name} SET search_term=?
        WHERE origin_id=?
      SQL
    end
end

#update_max_id(id) ⇒ Object 



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# File 'lib/odba/storage.rb', line 393

def update_max_id(id)
  @id_mutex.synchronize do
    @next_id = id
  end
end