Class: ActiveRecord::ConnectionAdapters::SimpleDBAdapter

Inherits:
AbstractAdapter
  • Object
show all
Defined in:
lib/active_record/connection_adapters/simpledb_adapter/adapter.rb

Constant Summary collapse

ADAPTER_NAME = 
'SimpleDB'.freeze
NIL_REPRESENTATION = 
"Aws::Nil".freeze
@@collections = 
{}
@@ccn = 
{}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(connection, logger, aws_key, aws_secret, domain_name, connection_parameters, config) ⇒ SimpleDBAdapter

Returns a new instance of SimpleDBAdapter.



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 91

def initialize(connection, logger, aws_key, aws_secret, domain_name, connection_parameters, config)
  super(connection, logger)
  @config = config
  @batch_started = false
  @domain_name = domain_name
  @connection_parameters = [
      aws_key,
      aws_secret,
      connection_parameters.merge(:nil_representation => nil_representation)
  ]
  connect
end

Instance Attribute Details

#batch_started ⇒ Object (readonly)

Returns the value of attribute batch_started.



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 89

def batch_started
  @batch_started
end

#domain_name ⇒ Object (readonly) 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 88

def domain_name
  @domain_name
end

Class Method Details

.set_collection_columns(table_name, columns_definition) ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 7

def self.set_collection_columns table_name, columns_definition
  @@collections[table_name] = columns_definition
  @@ccn[table_name] = columns_definition.collection_column_name
end

Instance Method Details

#adapter_name ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 22

def adapter_name
  ADAPTER_NAME
end

#begin_batch ⇒ Object

BATCHES ==========

Raises:

  • (ActiveRecord::ActiveRecordError) 


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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 54

def begin_batch
  raise ActiveRecord::ActiveRecordError.new("Batch already started. Finish it before start new batch") \
    if batch_started

  @batch_started = true
end

#clear_batch(type = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 78

def clear_batch type = nil
  if type.nil?
    batch_pool.clear
    @batch_started = false
  else
    batch_pool[type].clear
  end
end

#collection_column_name(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 16

def collection_column_name table_name
  @@ccn[table_name]
end

#columns(table_name, name = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 112

def columns table_name, name = nil
  @@collections[table_name].columns
end

#columns_definition(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 12

def columns_definition table_name
  @@collections[table_name]
end

#commit_batch(type = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 61

def commit_batch type = nil
  count = batch_pool.inject(0) {|sum, (key, value)| sum += value.count }
  clear_batch and return unless count

  log({:count => count }.inspect, "SimpleDB Batch Operation") do
    pool = batch_pool[:update] || []
    @connection.batch_put_attributes(domain_name, pool) \
      if pool.any? && (type.nil? || type == :update)

    pool = batch_pool[:delete] || []
    @connection.batch_delete_attributes(domain_name, pool) \
      if pool.any? && (type.nil? || type == :delete)

    clear_batch type
  end
end

#connect ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 104

def connect
  @connection = Aws::SdbInterface.new *@connection_parameters
end

#create_domain(domain_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 216

def create_domain domain_name
  @connection.create_domain domain_name
end

#delete_domain(domain_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 220

def delete_domain domain_name
  @connection.delete_domain domain_name
end

#delete_sql(sql, name = nil) ⇒ Object

Executes the delete statement and returns the number of rows affected.



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 212

def delete_sql(sql, name = nil)
  update_sql(sql, name)
end

#execute(sql, name = nil, skip_logging = false) ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 120

def execute sql, name = nil, skip_logging = false
  log_title = "SimpleDB (#{sql[:action]})"
  log_title += " *BATCHED*" if batch_started
  log sql.inspect, log_title do
    case sql[:action]
    when :insert
      item_name = get_id sql[:attrs]
      item_name = sql[:attrs][:id] = generate_id unless item_name
      if batch_started
        add_to_batch :update, item_name, sql[:attrs], true
      else
        @connection.put_attributes domain_name, item_name, sql[:attrs], true
      end
      @last_insert_id = item_name
    when :update
      item_name = get_id sql[:wheres], true
      if batch_started
        add_to_batch :update, item_name, sql[:attrs], true
      else
        @connection.put_attributes domain_name, item_name, sql[:attrs], true, sql[:wheres]
      end
    when :delete
      item_name = get_id sql[:wheres], true
      if batch_started
        add_to_batch :delete, item_name
      else
        @connection.delete_attributes domain_name, item_name, nil, sql[:wheres]
      end
    else
      raise "Unsupported action: #{sql[:action].inspect}"
    end
  end
end

#insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) ⇒ Object Also known as: create 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 154

def insert_sql sql, name = nil, pk = nil, id_value = nil, sequence_name = nil
  super || @last_insert_id
end

#list_domains ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 224

def list_domains
  @connection.list_domains[:domains]
end

#nil_representation ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 28

def nil_representation
  NIL_REPRESENTATION
end

#primary_key(_) ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 116

def primary_key _
  'id'
end

#quote(value, column = nil) ⇒ Object

QUOTING =====================


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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 37

def quote(value, column = nil)
  if value.nil?
    quote(nil_representation, column)
  else
    super
  end
end

#quote_column_name(column_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 45

def quote_column_name(column_name)
  "`#{column_name}`"
end

#quote_table_name(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 49

def quote_table_name(table_name)
  table_name
end

#select(sql, name = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 159

def select sql, name = nil
  log sql, "SimpleDB" do
    result = []
    response = nil
    if sql.offset
      first_query = sql.gsub(/LIMIT\s+\d+/, "LIMIT #{sql.offset}")
      first_query.gsub!(/SELECT(.+?)FROM/, "SELECT COUNT(*) FROM")
      log first_query, "SimpleDB (offset partial)" do
        response = @connection.select(first_query, nil, false)
      end
      response = @connection.select(sql, response[:next_token], false)
    else
      response = @connection.select(sql, nil, true)
    end
    collection_name = get_collection_column_and_name(sql)
    columns = columns_definition(collection_name)

    response[:items].each do |item|
      item.each do |id, attrs|
        ritem = {}
        ritem['id'] = id unless id == 'Domain' && attrs['Count'] # unless count(*) result
        attrs.each {|k, vs|
          column = columns[k]
          if column.present?
            ritem[column.name] = column.unconvert(vs.first)
          else
            ritem[k] = vs.first
          end
        }
        result << ritem
      end
    end
    result
  end
end

#supports_count_distinct? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 33

def supports_count_distinct?; false; end

#tables ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 108

def tables
  @@collections.keys
end

#translate_exception(exception, message) ⇒ Object 



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 195

def translate_exception(exception, message)
  clear_batch
  raise exception
end

#update_sql(sql, name = nil) ⇒ Object

Executes the update statement and returns the number of rows affected.



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# File 'lib/active_record/connection_adapters/simpledb_adapter/adapter.rb', line 200

def update_sql(sql, name = nil)
  begin
    execute(sql, name)
    1
  rescue Aws::AwsError => ex
    #if not a conflict state this raise
    raise ex if ex.http_code.to_i != 409
    0
  end
end