Class: KeyValueTree::TransactionStore

Inherits:
Store
  • Object
show all
Defined in:
lib/keyvaluetree/transaction_store.rb

Instance Method Summary collapse

Methods inherited from Store

#delete_all, #keys_starting_with

Constructor Details

#initialize(store = MemoryStore.new()) ⇒ TransactionStore

Returns a new instance of TransactionStore.



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# File 'lib/keyvaluetree/transaction_store.rb', line 5

def initialize(store = MemoryStore.new())
  @store = store
  @access_mutex = Mutex.new()
  reset()
end

Instance Method Details

#commit ⇒ Object 



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# File 'lib/keyvaluetree/transaction_store.rb', line 55

def commit
  @access_mutex.synchronize do
    @changed_properties.each do |key, value|
      @store.store(key, value)
    end
    @deleted_property_keys.each do |key|
      @store.delete(key)
    end
    reset()
  end
end

#delete(key) ⇒ Object 



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# File 'lib/keyvaluetree/transaction_store.rb', line 27

def delete(key)
  @access_mutex.synchronize do
    @changed_properties.delete(key)
    @deleted_property_keys << key
  end
end

#key(key) ⇒ Object 



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# File 'lib/keyvaluetree/transaction_store.rb', line 11

def key(key)
  @access_mutex.synchronize do
    result = @changed_properties[key]
    return result unless result.nil?
    @store.key(key)
  end
end

#keys ⇒ Object 



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# File 'lib/keyvaluetree/transaction_store.rb', line 34

def keys
  @access_mutex.synchronize do
    result = @store.keys + @changed_properties.keys
    @deleted_property_keys.each do |key|
      result.delete(key)
    end
    result
  end
end

#pending_changes? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/keyvaluetree/transaction_store.rb', line 73

def pending_changes?
  !(@changed_properties.empty? && @deleted_property_keys.empty?)
end

#rollback ⇒ Object 



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# File 'lib/keyvaluetree/transaction_store.rb', line 67

def rollback
  @access_mutex.synchronize do
    reset()
  end
end

#store(key, value) ⇒ Object 



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# File 'lib/keyvaluetree/transaction_store.rb', line 19

def store(key, value)
  @access_mutex.synchronize do
    @changed_properties[key] = value
    @deleted_property_keys.delete(key)
    value
  end
end

#to_hash ⇒ Object 



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# File 'lib/keyvaluetree/transaction_store.rb', line 44

def to_hash
  result = @store.to_hash
  @changed_properties.each do |key, value|
    result[key] = value
  end
  @deleted_property_keys.each do |key|
    result.delete(key)
  end
  result
end