Class: RnDB::Database

Inherits:
Object
  • Object
show all
Defined in:
lib/rndb/database.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(seed = Time.now.to_i) ⇒ Database

Opens a new fake database. A seed for the PRNG may be optionally supplied.



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# File 'lib/rndb/database.rb', line 9

def initialize(seed=Time.now.to_i)
  raise "database already open" unless Thread.current[:rndb_database].nil?
  Thread.current[:rndb_database] = self
  @prng = Random
  @seed = seed
end

Instance Attribute Details

#prng ⇒ Object

Returns the value of attribute prng.



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# File 'lib/rndb/database.rb', line 5

def prng
  @prng
end

#seed ⇒ Object (readonly)

Returns the value of attribute seed.



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# File 'lib/rndb/database.rb', line 6

def seed
  @seed
end

Class Method Details

.conn ⇒ Object

Get a connection to the database



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# File 'lib/rndb/database.rb', line 47

def conn
  Thread.current[:rndb_database]
end

Instance Method Details

#add_table(klass, size) ⇒ Object

Add a Table to the database, specifying the number of records to simulate.



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# File 'lib/rndb/database.rb', line 17

def add_table(klass, size)
  klass.send(:_migrate, size.to_i)
end

#load(state) ⇒ Object

Load state from the given hash.



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# File 'lib/rndb/database.rb', line 39

def load(state)
  state.each do |name, value|
    schema[name][:state] = value
  end
end

#reset ⇒ Object

Clear overridden state.



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# File 'lib/rndb/database.rb', line 27

def reset
  schema.each_value { |table| table[:state] = {} }
end

#schema ⇒ Object

Dump the table schemas as a hash.



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# File 'lib/rndb/database.rb', line 22

def schema
  Thread.current[:rndb_tables]
end

#state ⇒ Object

Dump just the overridden state as a hash.



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# File 'lib/rndb/database.rb', line 32

def state
  schema.transform_values do |table|
    table[:state]
  end
end