How to implement loose -coupled software architecture through the Picocontainer Core framework
How to implement loose -coupled software architecture through the Picocontainer Core framework
introduction:
In software development, loose coupling is an important design principle, which can increase the maintenance, testability and scalability of the code.Picocontainer Core is a lightweight Java dependent injection (DI) framework, and through it, we can implement loose coupling software architecture.This article will introduce how to use PicoContainer Core to build a loose -coupled application and provide some Java code examples.
Part 1: What is picocontiner core
Picocontainer Core is a framework based on dependencies, which can help us organize and manage the objects of the application.It realizes loose coupling by using the dependency relationship between objects as a constructive function parameter or setter method parameter.Picocontainer Core provides a container to create and manage the life cycle of the object, and automatically analyzes the dependency relationship between them.Using Picocontainer Core, we can complete the creation and dependencies of the object to the framework, so that developers are liberated from tedious dependency management tasks.
Part 2: Basic use of Picocontainer Core
We first need to add Picocontainer Core to our project.Picocontainer core can be added to the project dependence by Maven or manually.In the project, we need to create a container object to manage our object dependence.The following is a simple sample code:
import org.picocontainer.DefaultPicoContainer;
import org.picocontainer.MutablePicoContainer;
public class Main {
public static void main(String[] args) {
// Create a variable picocontainer container
MutablePicoContainer container = new DefaultPicoContainer();
// Add our objects to the container
container.addComponent(ServiceA.class);
container.addComponent(ServiceB.class);
container.addComponent(Client.class);
// Get our client object in the fairyware
Client client = container.getComponent(Client.class);
// Call the client method.
client.doSomething();
}
}
// Servicea class
public class ServiceA {
public void methodA() {
// do something
}
}
// Serviceb class
public class ServiceB {
public void methodB() {
// do something
}
}
// Client class
public class Client {
private ServiceA serviceA;
private ServiceB serviceB;
// Inject it through the constructor into service and service
public Client(ServiceA serviceA, ServiceB serviceB) {
this.serviceA = serviceA;
this.serviceB = serviceB;
}
public void doSomething() {
// Use servicea and serviceb to perform some operations
serviceA.methodA();
serviceB.methodB();
}
}
In the above example code, we first created a variable Picocontainer container, and then added our servicea, serviceb, and client objects to the container.By calling the `GetComponent ()" method, we have obtained the Client object in the fairy container.Picocontainer Core is responsible for analyzing the dependency relationship of the Client object, and automatically injected the servicea and serviceb objects it required into the constructor of the Client object.Finally, we call the `dosomething () method of the client object, which uses servicea and serviceb inside the method.
Part 3: Use Picocontainer Core to manage more complicated dependencies
In actual projects, we may encounter more complex dependencies.Picocontainer Core provides a variety of registered components, including constructor injection, setter method injection, provider injection, etc.The following is a more complicated example code:
import org.picocontainer.DefaultPicoContainer;
import org.picocontainer.MutablePicoContainer;
public class Main {
public static void main(String[] args) {
// Create a variable picocontainer container
MutablePicoContainer container = new DefaultPicoContainer();
// Construct function injection example
container.addComponent(ServiceA.class);
container.addComponent(ServiceB.class);
container.addComponent(ServiceC.class);
container.addComponent(Client.class);
// Setter method injection example
container.addComponent(ServiceD.class);
container.addComponent(ServiceE.class);
container.addComponent(Client2.class);
// The provider injects an example
container.addComponent(ServiceF.class);
container.addComponent(Client3.class);
// Get our client object in the fairyware
Client client = container.getComponent(Client.class);
Client2 client2 = container.getComponent(Client2.class);
Client3 client3 = container.getComponent(Client3.class);
// Call the client method, use various services inside this method
client.doSomething();
client2.doSomething();
client3.doSomething();
}
}
// The definitions of the definitions of ServiceA, Serviceb, Serviceb, Client and other classes are the same as the above examples
// Serviced class
public class ServiceD {
public void methodD() {
// do something
}
// setter method to inject service
public void setServiceE(ServiceE serviceE) {
// do something with serviceE
}
}
// Service class
public class ServiceE {
public void methodE() {
// do something
}
}
// Client2 class
public class Client2 {
private ServiceD serviceD;
private ServiceE serviceE;
// Inject service and service through the setter method
public void setServiceD(ServiceD serviceD) {
this.serviceD = serviceD;
}
public void setServiceE(ServiceE serviceE) {
this.serviceE = serviceE;
}
public void doSomething() {
// Use serviced and servicee to perform some operations
serviceD.methodD();
serviceE.methodE();
}
}
// ServiceF class
public class ServiceF {
public void methodF() {
// do something
}
}
// Client3 category
public class Client3 {
private Provider<ServiceF> serviceFProvider;
// The provider injects service
public Client3(Provider<ServiceF> serviceFProvider) {
this.serviceFProvider = serviceFProvider;
}
public void doSomething() {
// Use the servicef obtained through the provider to perform some operations
ServiceF serviceF = serviceFProvider.get();
serviceF.methodF();
}
}
In the above example code, in addition to using the constructor injection, we also display the injecting through the Setter method to manage more complex dependencies.In these ways, we can inject services more flexibly and meet the needs of different scenarios.
in conclusion:
This article introduces how to implement the loose -coupled software architecture through the Picocontainer Core framework.Through the Picocontainer Core, we can handle the dependency relationship between the objects to the framework to reduce the coupling degree between the objects.By example code, we show how to use Picocontainer Core to manage simple to complex dependencies.By mastering the use of Picocontainer Core, we can more efficiently build applications that can be maintained, scalable and easy to test.
