In -depth understanding of the J2EE connector architecture in the Java class library
In -depth understanding of the J2EE connector architecture in the Java class library
introduction:
J2EE (Java 2 Platform, Enterprise Edition) is a platform for developing distributed applications.The Connector Architecture provides a set of standardized APIs and specifications to establish a connection between enterprise -level applications and data sources.This article will introduce the concepts, design principles, main components, and how to use the connecter architecture for development in the Java class library in the J2EE connector architecture.
1. Overview of the J2EE connector architecture
The J2EE connector architecture provides a unified way for enterprise -level applications to access different resources, such as databases, message queues, email servers, etc.It defines a set of standard interfaces and protocols, enabling developers to write code that can be transplanted and has nothing to do with specific resources.
2. J2EE connector architecture design principles
The design of the connector architecture follows some key principles to ensure scalability, flexibility and reused:
-Base: The standardized API and protocols of the connecter architecture enable different applications to be seamlessly integrated.
-Howing: The code of the connecter architecture can run in different application servers without having to modify it.
-Apinity: The connector architecture provides security functions, such as authentication and access control to ensure data and system security.
-The high -performance: The connecter architecture improves the response speed and throughput of the system by using technologies such as connecting pools and buffers.
3. The main component of the J2EE connector architecture
Connector architecture contains the following main components:
3.1. Connector Interface
The connector interface defines the standard methods and protocols that communicate with resources.It provides an abstract way to access different resources for applications.Developers can write code independent resources based on the connector interface.
3.2. Connecting manager (Connection Manager)
The connection manager is responsible for managing the connection between the application and the resources.It maintains the connection pool, open connection interfaces, and is responsible for creating, destroying and recycling.
3.3. Adapter (adapter)
The adapter is an important component in the connector architecture to adapt the connector interface and specific resources.The adapter is responsible for converting the resource -specific API into the method of the connector interface definition, so that the application can transparently access different resources.
3.4. Component (component)
Component is the basic unit of applications developed using the connecter architecture.It is usually composed of business logic and connecter interface.The component can communicate with the resource through the connecter architecture and access and operate resources when needed.
4. Example of J2EE connector architecture in the Java class library
The following is a simple Java code example to demonstrate how to use the J2EE connector architecture to access the database:
import javax.resource.ResourceException;
import javax.resource.cci.Connection;
import javax.resource.cci.ConnectionFactory;
import javax.resource.cci.Interaction;
import javax.resource.cci.InteractionSpec;
import javax.resource.cci.Record;
import javax.resource.cci.ResultSet;
public class J2EEConnectorExample {
public static void main(String[] args) {
try {
//
ConnectionFactory connectionFactory = getFactory();
// Get connection (Connection)
Connection connection = connectionFactory.getConnection();
// Create interaction (Internet)
Interaction interaction = connection.createInteraction();
// Create interactive specifications (InternetSpec)
InteractionSpec spec = getSpec();
// Create an input record (Input Record)
Record inputRecord = getInputRecord();
// Executive interaction
Record outputRecord = interaction.execute(spec, inputRecord);
// Processing output records (Output Record)
processOutputRecord(outputRecord);
// Turn off the connection
connection.close();
} catch (ResourceException e) {
e.printStackTrace();
}
}
private static ConnectionFactory getFactory() {
// Return to the specific connection factory to implement
}
private static InteractionSpec getSpec() {
// Return to specific interaction specifications implementation
}
private static Record getInputRecord() {
// Return to specific input record implementation
}
private static void processOutputRecord(Record outputRecord) {
// Processing the logic of the output record
}
}
In the above sample code, we use the related classes of the J2EE connector architecture (such as ConnectionFactory, Connection, Interaction, InteractionSpec, etc.) to realize the interaction with the database.Specific connection of factories, interactive specifications and input records depends on the database resource adapter used.
in conclusion:
The J2EE connector architecture provides a standardized way to access different resources for enterprise -level applications.It can greatly improve the efficiency of developers while ensuring the portability and security of the application.By using the connector architecture, developers can focus on the development of business logic without paying attention to the details of the underlying resources.
references:
- Java EE Connector Architecture: https://docs.oracle.com/javaee/6/tutorial/doc/bnbpo.html
- J2EE Connector Architecture: https://en.wikipedia.org/wiki/Java_Platform,_Enterprise_Edition#Connector_Architecture
