creational design patterns in python

... Design Patterns? 21 Defining Design Patterns 23 The Learning Process 25 Studying Design Patterns 26 Notes on Object-Oriented Approaches 26 C# Design Patterns ... Companion Finally, we recently published Java Design Patterns: a Tutorial, and Visual Basic Design Patterns, which illustrate all of these patterns in those languages Defining Design Patterns We ... design patterns, providing yet another way to reinforce your learning of these patterns In addition, you’ll see UML diagrams of these programs, illustrating the interactions between classes in...

Ngày tải lên: 18/10/2013, 17:15

... Design Patterns? 21 Defining Design Patterns 23 The Learning Process 25 Studying Design Patterns 26 Notes on Object-Oriented Approaches 26 C# Design Patterns ... Companion Finally, we recently published Java Design Patterns: a Tutorial, and Visual Basic Design Patterns, which illustrate all of these patterns in those languages Defining Design Patterns We ... design patterns, providing yet another way to reinforce your learning of these patterns In addition, you’ll see UML diagrams of these programs, illustrating the interactions between classes in...

Ngày tải lên: 08/03/2014, 11:20

... Design Patterns? 21 Defining Design Patterns 23 The Learning Process 25 Studying Design Patterns 26 Notes on Object-Oriented Approaches 26 C# Design Patterns ... Companion Finally, we recently published Java Design Patterns: a Tutorial, and Visual Basic Design Patterns, which illustrate all of these patterns in those languages Defining Design Patterns We ... design patterns, providing yet another way to reinforce your learning of these patterns In addition, you’ll see UML diagrams of these programs, illustrating the interactions between classes in...

Ngày tải lên: 14/03/2014, 20:20

... www.it-ebooks.info xvi An Introduction to Design Patterns in C++ with Qt™, 2nd Edition certain design patterns The signal/slot mechanism, for example, makes objectoriented programming extremely easy and intuitive ... programming interfaces (APIs) for easy integration • Java programs are platform independent (Wintel, Solaris, MacOS, Linux, *nix, etc.) xix www.it-ebooks.info xx An Introduction to Design Patterns in ... to Qt since the first edition went to print www.it-ebooks.info PART I Design Patterns and Qt www.it-ebooks.info This page intentionally left blank www.it-ebooks.info C++ Introduction In this...

Ngày tải lên: 24/03/2014, 01:21

... Engine GasolineEngine Figure 1-4 DieselEngine A car can now have different kinds of engines 12 Chapter Building Better Programs with Patterns class Car def initialize @engine = GasolineEngine.new ... recurring patterns that the GoF saw as key to building clean, welldesigned object-oriented programs In the years since Design Patterns was published, people have described patterns in everything ... on OO design and patterns In the process of describing design patterns, Russ has captured the essence of solving many of the common programming hurdles that we face in day-to-day programming of...

Ngày tải lên: 29/04/2014, 14:42

... structures How:  Through inheritance (static binding) or composition (flexibility) Design Pattern Behavioral design patterns Behavioral  Chain of Responsibility  Command  Interpreter  Iterator ... pattern  examples drawn from existing systems Related Patterns  discussion of other patterns that relate to this one Creational Patterns Design Pattern Creational Patterns: Maze Game Case Study ... product family define a factory method for each product in a concrete factory Defining Extensible Factories  Adding a new kind of product requires changing the AbstractFactory interface and all...

Ngày tải lên: 16/07/2014, 04:00

... number of interfaces www.traintelco.com Summary 15 «interface» WindowAdapter WindowListener windowActivated() windowActivated() windowClosed() windowClosed() windowClosing() windowClosing() windowDeactivated() ... windowDeactivated() windowDeactivated() windowDeiconified() windowDeiconified() windowIconified() windowIconified() windowOpened() windowStateChanged() windowGainedFocus() windowLostFocus() windowOpened() windowStateChanged() ... thinking about the intent behind patterns and thinking about how you will apply patterns are very useful exercises Welcome to Oozinoz! The challenges in this book all cite examples from Oozinoz...

Ngày tải lên: 27/10/2014, 00:44

... and over again The book shows how these patterns are used to create good software designs In particular, the following design patterns are used throughout the text: singleton, container, enumeration, ... object-oriented design using Java and to illustrate the use of the emerging object-oriented design patterns Experienced object-oriented programmers find that certain ways of doing things work best ... understand the workings of classes, interfaces, and inheritance in order to understand the unifying class hierarchy discussed in Chapter Online Course Materials   Additional material supporting this book...

Ngày tải lên: 13/02/2015, 11:26

... cho thể hiện, registry Windows - Mẫu thiết kế : SingleObject.java public class SingleObject { //create an object of SingleObject private static SingleObject instance = new SingleObject(); //make ... abstract class AbstractLogger { public static int INFO = 1; public static int DEBUG = 2; public static int ERROR = 3; protected int level; //next element in chain or responsibility protected AbstractLogger ... public interface Expression { public boolean interpret(String context); } TerminalExpression.java public class TerminalExpression implements Expression { private String data; public TerminalExpression(String...

Ngày tải lên: 30/03/2015, 21:22

... addPrintJob method to add a print job to the PrintQueue object In the other interaction, a PrintDriver object calls the PrintQueue object’s getPrintJob method to get a print job from the PrintQueue ... Enterprise Design Patterns ™ Patterns in JavaTM, Volume MARK GRAND MARK GRAND New York New York ● ● John Wiley & Sons, Inc ChichesterJohn Wiley & Sons, Inc Singapore Weinheim Brisbane Chichester Weinheim ... previous two works on Patterns in Java The first volume focused exclusively on general-purpose design patterns The second volume moved away from design patterns to include a variety of patterns used...

Ngày tải lên: 14/08/2014, 02:20

... important thing that you should to ensure the consistency of a transaction is testing The Unit Testing and System Testing patterns described in Patterns in Java, Volume are useful in designing appropriate ... The patterns in this chapter can be used to design the high-level architecture of distributed designs Because some of these patterns involve infrastructure, the patterns can be incorporated into ... terminals that employees use to tell the system when they begin working and when they stop working The terminals feed that information to a server One or more TimekeepingTerminal * TimekeepingServer...

Ngày tải lên: 14/08/2014, 02:20

... preventing downtime Ÿ Using redundant components increases the complexity of a system and the difficulty of designing, integrating, and configuring it Ÿ The use of redundant components increases ... Multiplexing (229) The patterns in this chapter involve designs for computations that are performed in multiple computing environments or are structured as if they were performed in multiple computing ... new instance to finish what the old instance started if everything it needs to finish is copied to the new environment as part of serialization/deserialization Allowing the new instance to finish...

Ngày tải lên: 14/08/2014, 02:20

... writing software for a new kind of smart food processor that turns raw ingredients into cooked, ready-to-eat food by slicing, dicing, mixing, boiling, baking, frying, and/or stirring the ingredients ... by defining a number of interfaces Objects that implement the appropriate interfaces can participate in an InfoBus by simply attaching themselves to the InfoBus In the course of interacting with ... CORBA naming service Instead of binding names to proxies, it binds them to something called an Interoperable Object Reference (IOR) An IOR is a string that has, embedded in it, all of the information...

Ngày tải lên: 14/08/2014, 02:20

... int, int) The read method uses the readInt method to read the byte counts that the server inserts into the data stream private final int readInt() throws IOException { InputStream in = this .in; ... public InputStream getInputStream() throws IOException { if (myInputStream==null) { synchronized (this) { if (myInputStream==null) { InputStream superIn; superIn = super.getInputStream(); myInputStream ... just one kind of item, a kitchen sink A similar organization applies to many other kinds of 204 ■ C HAPTER S IX KitchenSink KitchenSinkData Uses ▲ -basinCount:int +getBasinCount( ):int weight...

Ngày tải lên: 14/08/2014, 02:20

... object InputStream in = actualSocket.getInputStream(); int otherBufferSize = new DataInputStream (in) .readInt(); BufferedInputStream bin; bin = new BufferedInputStream (in) ; actualIn = new DataInputStream(bin); ... Concurrency Patterns ■ 283 RELATED PATTERNS Singleton The Singleton pattern (described in Volume 1) uses a single instance of a class for an entire program The Session pattern uses a single instance ... MultiplexerSocketImpl Here is the InputStream class that reads input by getting ChunkBuffer objects containing input bytes from a MultiplexerSocket object class ChunkedInputStream extends InputStream { // This...

Ngày tải lên: 14/08/2014, 02:20

... expirations.add(insertionIndex, node); } // scheduleRemoval(LinkedList) /** * Determine where in a LinkedList an object belongs * based on expiration times */ private int findInsertionIndex(LinkedList ... TransactionHistory by * putting its LinkedList object in an ArrayList that * is sorted by expiration time */ synchronized void scheduleRemoval(LinkedList node) { int insertionIndex = findInsertionIndex(node); ... manage waiting tasks is to put them in a queue Putting waiting tasks in a queue ensures that they are run in the order in which they arrive You can choose other scheduling policies by choosing another...

Ngày tải lên: 14/08/2014, 02:20

... // if int latestIndex = 0; Interval latestInterval = intervals[latestIndex]; for (int i=1; i

Ngày tải lên: 14/08/2014, 02:20

... return buf.toString(); } // format(Date) /** * Format a String object by enclosing it in single quotes and * doubling any internal single quotes */ public static String format(String s) { if (s==null) ... shown in Figure 9.11 include retrieving instances of BusinessClass from a database and using the contents of in- memory instances of BusinessClass to update the persisted version of its instances ... void setStarRating(Integer starRating){ if (this.starRating != starRating) { this.starRating = starRating; dirty = true; } // if } // setStarRating(Integer) /** * Return true if the information...

Ngày tải lên: 14/08/2014, 02:20

... thisRestaurant; } // if String name = rs.getString(2); String cuisine = rs.getString(3); int rating = rs.getInt(6); Integer starRating = (rating>=1 ? new Integer(rating): null); boolean deliveryAvailable ... myVersion.getMeasurementDimension() getName(); String dimensionString; dimensionString = JDBCUtil.format(dimension); String inventoryFlagString = JDBCUtil.format(myVersion.isInventory()); query = "INSERT INTO itm_item_version_tb" ... responsibleEntityString+"," + startDateString + "," + endDateString + "," + nameString + "," + descriptionString + "," + unitString + "," + dimensionString + "," + inventoryFlagString + ")"; myStatement.executeUpdate(query);...

Ngày tải lên: 14/08/2014, 02:20

... reordered clones and intertwined clones In a reordered clone, the exact or parameterized matching lines of the code are re-ordered, whereas in an Intertwined clone, these lines are intertwined with each ... lead to unintended aliasing, resulting in hidden bugs that show up later Increase in code size: There is considerable increase in size of source code because of cloning This, in turn, increases ... focus on similarity patterns representing design concepts or solutions that can be of significant importance in the context of understanding, maintaining, reengineering or reusing programs We use...

Ngày tải lên: 15/09/2015, 17:09