italopaiva

# Consider this example to illustrate the Open-Closed Principle (OCP):
#
# Let's say you a have a client SomeClient that uses 
# a class DatabaseConnection to connect to the database and do something.
#
class SomeClient
  def do_something
    params = [:mysql, 'host', 1234, 'dbname', 'user', 'pass']
    connection = DatabaseConnection.new(*params).connect
  end

italopaiva

# Consider this Rails example to illustrate the Single Responsability Principle(SRP):
#
# Domain information:
#   - A document has a number and needs one vinculated process and may have
#     many involveds (people involved in the document's matters) on it.
#   - A document can only be created if a process is given.
#   - The process can only be created if the document was created too.
#   - There are some other rules to create a document and them may change in the future.
#     For example, the informed document number needs to be checked agains an external system before saving.
#   

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"""
This code exemplify the use of metaclasses, decorators and signals in python3
"""

def logged(function):
    """
    Decorator to log the creation of an object of class with given arguments
    """
    def decorator(cls, *args, **kwargs):
        print('Object of class %s created!' % cls)