ssis design patterns

: Interface high cohesion is internally highly dependent and isolated as much as possible. That is, the method of internal declaration of an interface is related to a sub-module, and is required by this submodule. Interface design is limited: If you fully follow the principle of interface separation, there will be a problem, that is, the design of the interface will be less and less, so that the number

}Singletonlazy The object is not created immediately after it is loaded into the method area, it is not created until the GetInstance method is called. This way can save memory space, but there is also a thread security problem, when thread a execution to the judgment object is null, when thread B gets execution, thread B determines that the object is null, then thread a regain execution, create the object, thread B resumes, continue to create the object. Modify the code as follows, using a sync

classes have the same behavior and state.4), ISP (Interface segregation Principle): interface separation principle;Client should not being forced to using a interface if it does not need it. Interface separation rules are designed to work with multiple specific functionsInterface to avoid the redundancy caused by the common interface.5), DIP (Dependency inversion Principle): dependency inversion principle;The high level modules should is depend on the low level modules but the should depend on

"/"; return NewChu ($a,$b); Break; Case"%"; return NewQuyu ($a,$b); Break; } } } $j= Gongchang::d uixiang (3,2, "%");//Test Echo $j->js ();//OutputOutput resultsSecond, the design of six major principles1. The open-close principle is that the design should have good support for the extension, and the modification should be strictly limited.2. On the Richter scale also, the subclass mu

hungrysingle () // Step 2 7 {8 9} 10 11 public static hungrysingle getinstance () // step 3 12 {13 return sinstance; 14} 15 16}View code Statement of the single-Profit Mode in unity: 1 public sealed class SingletonMoBehaviour: MonoBehaviour 2 { 3 private static volatile SingletonBehaviour instance; 4 private static object syncRoot = new Object(); 5 public static SingletonBehaviour Instance 6 { 7 get 8 { 9 if (instance == null) 10

base classDo not let classes derive from specific classesA variable cannot hold a reference to a specific class6: Abstract Factory Method mode provides an interface for creating a family of related or dependent objects without having to specify a specific class.The factory method pattern uses inheritance: Delegate the creation of objects to subclasses, subclasses implement factory methods to create objects, and abstract factory method patterns use a

Talking about 23 design patterns from chasing mm-it's classic. Go to your blog and add them first. As a programmer, the design pattern is becoming increasingly popular. the attention of the net community. This change is very gratifying. the Java Community is ahead of us, but this situation may change one day. Talking about 23 Java

Com.raylee.designpattern.strategy.ch04;public class Client {//The user, Department, and course are subject to additional deletions public static void main (string[] args) {Courseserviceimpl Courseserviceimpl = new Courseserviceimpl (); Courseserviceimpl.importcourse (); Courseserviceimpl.exportcourse (); Userserviceimpl Userserviceimpl = new Userserviceimpl (); Userserviceimpl.importuser (); Userserviceimpl.exportuser () ;D Eptserviceimpl Deptserviceimpl = new Deptserviceimpl ();d eptserviceimp

pool overflow, if the instantiated object is not exploited for a long time,The system is considered garbage and is recycled by GC resulting in loss of object state　　Lazy mode:　　　　　　A Hungry man mode:Dual Lock mode:　　　　　　Summarize:　　1, lazy mode features: Thread insecure, load classes faster, run time to get objects slower,2, a Hungry man mode features: Thread safety, load class is slow, run time to get objects faster3, double lock mode: Thread-safe, load class faster, run-time to get objects at

Three basic design patterns (three of the most common in all object-oriented design patterns):① Factory mode : Use factory methods or classes to generate objects instead of directly new in codeCreate a new factory.php under the Common directory:phpnamespace Common; class factory{ staticfunction createdatabase () {

); }/** * Will gather the observers to empty */public synchronized void Deleteobservers () {obs.removeallelements (); }/** * Set "changed" to True */protected synchronized void setchanged () {changed = TRUE; }/** * Resets "changed" to False */protected synchronized void clearchanged () {changed = FALSE; }/** * Detects if this object has changed */public synchronized Boolean hasChanged () {return changed; }/** * Returns the number of observers of this This class represents an obse

Seven major design principles:1. Single Duty principle: one class is responsible for a duty.2, the Richter replacement principle: Subclasses can extend the function of the parent class, but cannot change the original function of the parent class.3, dependency inversion principle: The high-level module should not rely on the lower layer module, both should rely on its abstraction; abstraction should not depend on detail; detail should depend on abstrac

The design pattern (English pattern) is a solution to the recurring problems in object-oriented design. The term was introduced into computer science in the 1990 's by people such as Erich Gamma and others from the field of architectural design. The meaning of the term is also controversial. The algorithm is not a design