The technical principles of the Proxool framework in the Java library
The Proxool framework is a lightweight connection pool technology widely used in the Java class library.This article will introduce the technical principles of the Proxool framework and provide some Java code examples.
1 Introduction
The PROXOOL framework is a database connection pool technology that can manage and reuse the database connection, reducing the overhead created and destroyed the connection when each request.It can significantly improve the performance of database operations in the Java application.
2. Proxool's working principle
The Proxool framework mainly includes three key components: connecting pools, managers and drivers.The functions of each component will be introduced in detail below.
2.1 Connection Pond
The connection pool is the core component of the Proxool framework and is responsible for managing the database connection.When the application needs to establish a connection with the database, it first obtains an available connection from the connection pool.If the connection pool is empty, it will automatically create a new connection according to the configuration parameter.
The connection pool uses multi -threaded technology to efficiently handle concurrent requests.Each connection is encapsulated into an agent object. When the application is used, the proxy object will release the connection to the connection pool for other threads.
2.2 Manager
The manager is the control center of the Proxool framework, which is responsible for managing the usage of the connection pool and tracking connection.It will monitor the status of the connection according to some strategic monitoring and decide whether to increase or reduce the number of connections.
Manager is also responsible for handling the life cycle of connection, including creation, destroying and restarting connections.According to the configuration parameters, the manager can regularly check the health state of the connected to ensure that they can be used for applications.
2.3 Driver
The driver acts as a bridge between the database and the PROXOOL framework.It is responsible for passing the database request initiated by the application to the connection pool and returning the query results to the application.The driver can also intercept the error message of the database and process it as needed.
3. Proxool configuration
The Proxool framework defines the behavior of the connection pool by configuration files.Through the configuration file, the minimum and maximum number of connections, the timeout time, and the survival time of the free connection can be set.
Here are a simple proxool configuration file example (proxool.properties):
properties
proxool.alias=test
proxool.driver-class=com.mysql.jdbc.Driver
proxool.pool.maximum-connection-count=10
proxool.pool.minimum-connection-count=5
proxool.pool.maximum-active-time=1800000
proxool.pool.simultaneous-build-throttle=10
proxool.pool.maximum-connection-lifetime=600000
proxool.pool.house-keeping-sleep-time=10000
proxool.pool.prototype-count=5
proxool.pool.maximum-connection-retention=10
proxool.pool.verbose=true
4. Java code example
Here are a simple Java code example to demonstrate how to use the Proxool framework to obtain the database connection:
import org.logicalcobwebs.proxool.ProxoolDataSource;
import java.sql.Connection;
import java.sql.SQLException;
public class DatabaseManager {
private static ProxoolDataSource dataSource;
static {
dataSource = new ProxoolDataSource();
dataSource.setAlias("test");
dataSource.setDriver("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://localhost:3306/mydatabase");
dataSource.setUser("username");
dataSource.setPassword("password");
}
public static Connection getConnection() throws SQLException {
return dataSource.getConnection();
}
public static void main(String[] args) {
try {
Connection connection = DatabaseManager.getConnection();
// Use the connection to perform the database operation
// ...
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
In the above example, we configure the connection pool by setting the property of the ProxoolDataSource.Then get a database connection by calling the getConnection () method.Finally, we can use the connection object to perform the database operation and close the connection after completion.
Summarize:
This article introduces the technical principles of the Proxool framework in the Java class library.By using the Proxool framework, we can effectively manage and reuse the database connection to improve the performance of database operations in the Java application.By reasonable configuration connection pool, we can flexibly control the number and behavior of the connection according to the needs of the application.I hope this article will help you understand the working principle of the Proxool framework.
