fowler s enterprise design patterns

... relationship of a subclass that inherits from a superclass The class diagram in Figure 2.6 shows the abstract class Product as the superclass of the ConcreteProduct class You can tell that it is abstract ... responsibilities to classes, design GUIs, write code, and test software This third volume contains design and architectural patterns for use in distributed and enterprise applications The topics include patterns ... class There is another use for ellipsis in a class diagram Some class diagrams need to show that a class has a large or open-ended set of subclasses FIGURE 2.11 Aggregation Manages ▲ MessageManager...

Ngày tải lên: 14/08/2014, 02:20

... class StateSavingClass1, StateSavingClass2, Classes in this role are responsible for saving and restoring the state of TransactionParticipant objects These classes are usually specific to a single ... 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 tests Using the Assertion ... The Stub, CallDispatcher, and Skeleton roles constitute a message layer Stub classes turn a call into a message, which is interpreted by CallDispatcher and Skeleton classes Skeleton classes are...

Ngày tải lên: 14/08/2014, 02:20

... to ensure that no single failure can make a system unavailable Since this is a book about software design, this pattern ignores the hardware issues It describes how to ensure that a single software ... it is shared between programs or databases CONTEXT Suppose you’re designing a computer system for a business that operates a barter clearinghouse for the exchange of goods and services The same ... mission-critical computing components on space flights Software used by stock exchanges to process stock trades use redundant software components The software used to manage telephone networks...

Ngày tải lên: 14/08/2014, 02:20

... messages, it includes a set of topics of interest That results in messages associated with only those topics being sent to the recipient object KNOWN USES Sybase s SQL Anywhere uses publish-subscribe ... class s instances ⁄ Malicious classes can call the private methods of other classes and access the private variables of other classes However, malicious classes cannot access the local variables ... initiated a message is :MessageSource r: Recipient 2B.1: deliver(message) 2A*: publish(message) 1: subscribe(r) 1.1: subscribe (s) s: Subscriber 2B*: deliver(message) FIGURE 6.8 Publish-Subscribe collaboration...

Ngày tải lên: 14/08/2014, 02:20

... ArrayList getMessages() { ArrayList temp = (ArrayList)messages.clone(); messages.clear(); return temp; } // getMessages() } // class Mailbox RELATED PATTERNS Publish-Subscribe The Publish-Subscribe pattern ... superclass s constructor It passes it twice This is because RMI allows you to use a separate object for a Socket factory and a ServerSocket factory Since the subclass of Socket and ServerSocket ... class extends the ServerSocket class so that the Socket object it creates when it accepts a connection sends heartbeat messages to the client public class HeartbeatServerSocket extends ServerSocket...

Ngày tải lên: 14/08/2014, 02:20

... includes the session object Another aspect of this is that the server does not use any session specific resources, such as files or locks, unless it is processing a call from a session s client ... that shares the file system that the session object is stored on In many cases, the session is associated with a user rather than a computer or file system In such cases, it is usually desirable ... process each session Instance variables are shared by all threads Session objects must be visible only to the thread that is processing the corresponding session One way to make the session object...

Ngày tải lên: 14/08/2014, 02:20

... these state-encapsulating objects’ class is StateSavingClass This role is unusual in that classes can fill this role without sharing any common superclasses or interfaces The only Concurrency Patterns ... TransactionHistoryCache class, which is responsible for caching TransactionHistory objects The class in the ObjectDeletionScheduler role is an inner class in the TransactionHistoryCache class class TransactionHistoryCache ... BlockedExecutionStrategy interface You can subclass the ThreadPool class to add more subclasses, and/or create subclasses of these strategy classes If so, you will also want to add or modify the corresponding...

Ngày tải lên: 14/08/2014, 02:20

... BusinessClass1, BusinessClass2, Instances of classes in this role are an application s business objects that are stored in and fetched from persistent storage by a persistence layer BusinessClass1PersisterIF, ... BusinessClass1PersisterIF, BusinessClass2PersisterIF, Interfaces in this role declare methods used to persist instances of a corresponding business class The names and signatures of the methods declared ... is extrinsic Its state does not reside in the BusinessObject instance itself, but in associated instances of BusinessObjectState The only attributes of BusinessObject that are intrinsic (reside...

Ngày tải lên: 14/08/2014, 02:20

... TypeConversion1 TypeConversion2 Uses ▲ Uses ▲ ▲ Uses ▲ Uses BusinessClass2PersisterImpl Uses 425 ▲ BusinessClass1PersisterImpl ■ Uses FIGURE 9.10 Type Conversion pattern database may be expressed ... instances of BusinessClass to update the persisted version of its instances When a BusinessClassPersister object instantiates a BusinessClass object, it ensures that its isDirty method returns ... 9.11 shows this class structure The responsibilities of the BusinessClassPersister class shown in Figure 9.11 include retrieving instances of BusinessClass from a database and using the contents...

Ngày tải lên: 14/08/2014, 02:20

... same package as the class they are responsible for persisting PersistableIF Classes should implement PersistableIF or CachableIF if their instances are to be persisted Classes whose instances ... super(myManager); Class persisterClass = ResponsibleEntityPersisterIF.class; try { responsibleEntityPersister = (ResponsibleEntityPersisterIF) myManager.getPersister(persisterClass); } catch (NotFoundException ... the same class The class it instantiates will be specific to a single type of persistent store The class that this release instantiates is specific to JDBC-based persistence Future releases may...

Ngày tải lên: 14/08/2014, 02:20

... Programming Design) tổ chức Cũng năm s ch Design patterns : Elements of Reusable Object Oriented Software (Gamma, Johnson,Helm Vhissdes,1995) xuất vào thời điểm diễn hội nghị OOPSLA’94 Đây tài ... dịch s dụng cách diễn tả để phiên dịch câu c .S đồ UML AbstractExpression (Expression) - Khai báo giao diện cho việc thực thao tác TerminalExpression ( ThousandExpression, HundredExpression, ... Giả s cấy trúc ngữ pháp sau xác định biểu diễn thông thường : expression ::= literal | alternation | sequence | repetition | '(' expression ')' alternation ::= expression '|' expression 35 sequence...

Ngày tải lên: 24/08/2012, 13:53

... Exoression public ArrayList getExpressions() { return expressions; } public void setExpressions(ArrayList expressions) { this.expressions = expressions; } public void interpret(Context ... USAddressBuilder.java class USAddressBuilder extends AddressBuilder { private Address add; public void buildStreet(String street) { add.setStreet(street); } 10/25/2009 2:21 PM Hệ thống mẫu design ... implements AddressFactory { public Address createAddress() { return new USAddress(); } public PhoneNumber createPhoneNumber() { return new USPhoneNumber(); } } USAddress.java public class USAddress...

Ngày tải lên: 06/09/2012, 14:31

... • knows which subsystem classes are responsible for a request delegates client requests to appropriate subsystem objects Subsystem classes (Bank, Credit, Loan) o implement subsystem functionality ... Framework include a set of classes that are designed around the Stream class The Stream class is an abstract class that reads or writes a sequence of bytes from any IO device (disk, sockets, memory, etc) ... President) o handles requests it is responsible for o can access its successor o if the ConcreteHandler can handle the request, it does so; otherwise it forwards the request to its successor • Client...

Ngày tải lên: 12/09/2012, 14:38

... rights reserved Page of 21 Design Pattern Framework™ 2.0 Chapter 1: Intro to Design Patterns The Head First Design Patterns book has taken the developer community by storm and has been a bestseller ... includes a total of 46 projects all residing in a single NET Solution for easy access This document does things: 1) it associates the original Java projects with the NET projects, 2) it references ... name: observer/WeatherStationObservable Implemented as DoFactory.HeadFirst.Observer.WeatherStationObservable NET does not support the Observer/Observable built-in types so this example uses two...

Ngày tải lên: 12/09/2012, 14:40

... parameters of the S Parameter part Start = 1GHz, Stop=3GHz and Step=0.2GHz Start= GHz Stop= GHz Step =0.2GHz © Dr.B .S. Virdee 12 12 Add MSUB • On the Schematic Window: get a part MSUB under Tlines-Microstrip ... mouse button • To stop adding the part, push ESC key, or select ‘End commend ESC’ in the menu by clicking right mouse button Category Part Window Select TLine-Microstrip category Use the scroll ... and place © Dr.B .S. Virdee 11 11 Add S Parameter • On the Schematic Window: get a part S P under Simulation-Sparam, or type S_ param’ in the part window • Then, paste the part as shown in Figure...

Ngày tải lên: 15/10/2012, 08:33

... System.IO.Stream System.IO.BufferedStream System.IO.FileStream System.IO.MemoryStream System.Net.Sockets.NetworkStream System.Security.Cryptography.CryptoStream The subclasses decorate Stream because ... of this table for classes is as follows: • A non-nested class is by default visible to other classes in the same assembly • A nested class is by default private and can have no more accessibility ... a class and its derived classes – protected internal Accessible within a class, its derived classes, or an assembly – public Accessible everywhere Members of enums and interfaces Now, let s look...

Ngày tải lên: 06/08/2013, 17:28

... SOA Design Patterns Project Class Usage Document Centric WebSOAService All messages RequestResponse WebSOAService Service.cs (.vb) Reservation WebSOAService MessageBase Idempotent WebSOAService ... WebSOAService MessageBase Message Router WebSOAService PersistType Private Identifier WebSOAService MessageBase Each service method represent a business process as a complete unit of work This requires a ... clients When a web service is viewed as a group of message end-points, the emphasis shifts from public methods to public messages Now that we have discusses some of principles and best practices,...

Ngày tải lên: 29/09/2013, 17:20

... WEB SERVICES Listing 3-4 The IDC File for the RequestQuote Operation and Its Associated Types using using using using using System; System.Web.Services; System.Web.Services.Description; System.Web.Services.Protocols; ... to use a visual designer tool, such as Visual Studio 2005 s XML Designer To access the designer, simply add a new XSD schema file to a project Visual Studio provides both a visual design view ... the Source Code/Download section on the Apress web site at http://www.apress.com) Design the XML Messages and XSD Schemas (Step 1) XML messages represent the operations that your Web service supports,...

Ngày tải lên: 05/10/2013, 08:48

... StockTraderContracts Web Service using using using using System.Web; System.Web.Services; System.Web.Services.Protocols; System.Web.Services.Description; using StockTraderTypes; using StockTraderBusiness; namespace ... StockTraderBusiness Business Assembly using System; using StockTraderTypes; namespace StockTraderBusiness { public class StockTraderBusiness : StockTraderTypes.IStockTrader { public Quote RequestQuote(string ... is the business assembly The Business Assembly (StockTraderBusiness) The business component sets references to both the service agent assembly and the definition assembly of custom types Listing...

Ngày tải lên: 05/10/2013, 08:48

... Page 229 Design Patterns for SOAP Messaging with WS-Addressing and Routing Listing 9-5 The SoapSender Class SoapSender soapSender = new SoapSender(toUri); soapSender.Send(message); The SoapReceiver ... Listing 9-4 illustrates several important points: SOAP messages cannot be empty, because their purpose is to communicate requests or responses Here, the SOAP message is designed to transmit a stock ... SoapReceiver class is abstract and must be implemented in a custom class that is assigned to receive the corresponding response for a message request In a sense, this custom SOAP receiver class acts like...

Ngày tải lên: 05/10/2013, 08:51