Adds one or more items to the batch to delete.

  # for a table w/out a range key
  batch = AWS::DynamoDB::BatchWrite.new
  batch.delete('table-name', %w(hk1 hk2))
  batch.process!

  # for a table with a range key
  batch = AWS::DynamoDB::BatchWrite.new
  batch.delete('table-name', [['hk1', 'rk2'], ['hk1', 'rk2']]])
  batch.process!

@param [Table,String] table A {Table} object or table name string.

@param [Array<String>,Array<Array>] items A list of item keys to

  delete.  For tables without a range key, items should be an array
  of hash key strings.

     batch.delete('table-name', ['hk1', 'hk2', 'hk3'])

  For tables with a range key, items should be an array of
  hash key and range key pairs.

     batch.delete('table-name', [['hk1', 'rk1'], ['hk1', 'rk2']])

@return [nil]

Proccesses pending request items. @return [nil]

Adds one or more items to the batch write operation.

  # adding one item at a time to the batch
  batch = AWS::DynamoDB::BatchWrite.new
  batch.put('table-name', :id => 'id1', :color => 'red')
  batch.put('table-name', :id => 'id2', :color => 'blue')
  batch.process!

  # adding multiple items to a batch
  batch = AWS::DynamoDB::BatchWrite.new
  batch.put('table-name', [
    { :id => 'id1', :color => 'red' },
    { :id => 'id2', :color => 'blue' },
    { :id => 'id3', :color => 'green' },
  ])
  batch.process!

@param [Table,String] table A {Table} object or table name string.

@param [Array<Hash>] items A list of item attributes to put.

  The hash must contain the table hash key element and range key
  element (if one is defined).

@return [nil]

Add items to the batch. Accepts both item to put and and items to delete.

@param [Table,String] table A {Table} object or table name string.

@param [Hash] options

@option options [Array<Hash>] :put An array of items to put. Each item

  should be an array of attribute hashes.

    # add 3 items to the batch
    batch.write(table, :put => [
      { :id => 'abc', :color => 'red', :count => 2 },
      { :id => 'mno', :color => 'blue', :count => 3 },
      { :id => 'xyz', :color => 'green', :count => 5 },
    ])

@option options [Array<String>,Array<Array>] :delete A list of item keys

  to delete.  For tables without a range key, items should be an array
  of hash key strings.

     batch.write('table-name', :delete => ['hk1', 'hk2', 'hk3'])

  For tables with a range key, items should be an array of
  hash key and range key pairs.

     batch.write('table-name', :delete => [['hk1', 'rk1'], ['hk1', 'rk2']])