quartz怎么扩展自己的c3p0为druid连接池

文章转载自： https://blog.csdn.net/minicto/article/details/77897577

考虑到调度中心和平台系统的统一性和稳定性，需要深入调研数据源连接池的内部应用技术，同时扩展成为Druid连接池技术。

1.Quartz各版本数据库连接池技术更新情况 
Quartz 2.0 以前 DBCP 
Quartz 2.0 以后 C3P0（包含2.0）

2.本项目使用Quartz2.2.2,数据库连接池默认配置如下 
在quartz.properties文件中的配置项： 
org.quartz.dataSource.myDS(数据源名).connectionProvider.class:org.quartz.utils.PoolingConnectionProvider

3.扩展Druid数据库连接池配置调整如下 
org.quartz.dataSource.myDS(数据源名).connectionProvider.class = XXXXX(自定义的ConnectionProvider)

4.自定义Druid数据库连接池，需要实现org.quartz.utils.ConnectionProvider接口,同时引入Druid相关的jar包，代码如下：

package com.acts.web.common.connection;
import com.alibaba.druid.pool.DruidDataSource;
import org.quartz.SchedulerException;
import java.sql.Connection;
import java.sql.SQLException;
import org.quartz.utils.ConnectionProvider;
/**
 * Druid连接池的Quartz扩展类
 * 创建者    张志朋
 * 创建时间    2016年7月26日
 *
 */
public class DruidConnectionProvider implements ConnectionProvider {
     /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     *
     * 常量配置，与quartz.properties文件的key保持一致(去掉前缀)，同时提供set方法，Quartz框架自动注入值。
     *
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */
    //JDBC驱动
    public String driver;
    //JDBC连接串
    public String URL;
    //数据库用户名
    public String user;
    //数据库用户密码
    public String password;
    //数据库最大连接数
    public int maxConnection;
    //数据库SQL查询每次连接返回执行到连接池，以确保它仍然是有效的。
    public String validationQuery;
    private boolean validateOnCheckout;
    private int idleConnectionValidationSeconds;
    public String maxCachedStatementsPerConnection;
    private String discardIdleConnectionsSeconds;
    public static final int DEFAULT_DB_MAX_CONNECTIONS = 10;
    public static final int DEFAULT_DB_MAX_CACHED_STATEMENTS_PER_CONNECTION = 120;
    //Druid连接池
    private DruidDataSource datasource;
    /*
    * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    *
    * 接口实现
    *
    * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    */
    public Connection getConnection() throws SQLException {
        return datasource.getConnection();
    }
    public void shutdown() throws SQLException {
        datasource.close();
    }
    public void initialize() throws SQLException{
        if (this.URL == null) {
            throw new SQLException("DBPool could not be created: DB URL cannot be null");
        }
        if (this.driver == null) {
            throw new SQLException("DBPool driver could not be created: DB driver class name cannot be null!");
        }
        if (this.maxConnection < 0) {
            throw new SQLException("DBPool maxConnectins could not be created: Max connections must be greater than zero!");
        }
        datasource = new DruidDataSource();
        try{
            datasource.setDriverClassName(this.driver);
        } catch (Exception e) {
            try {
                throw new SchedulerException("Problem setting driver class name on datasource: " + e.getMessage(), e);
            } catch (SchedulerException e1) {
            }
        }
        datasource.setUrl(this.URL);
        datasource.setUsername(this.user);
        datasource.setPassword(this.password);
        datasource.setMaxActive(this.maxConnection);
        datasource.setMinIdle(1);
        datasource.setMaxWait(0);
        datasource.setMaxPoolPreparedStatementPerConnectionSize(DEFAULT_DB_MAX_CONNECTIONS);
        if (this.validationQuery != null) {
            datasource.setValidationQuery(this.validationQuery);
            if(!this.validateOnCheckout)
                datasource.setTestOnReturn(true);
            else
                datasource.setTestOnBorrow(true);
            datasource.setValidationQueryTimeout(this.idleConnectionValidationSeconds);
        }
    }
    /*
    * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    *
    * 提供get set方法
    *
    * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    */
    public String getDriver() {
        return driver;
    }
    public void setDriver(String driver) {
        this.driver = driver;
    }
    public String getURL() {
        return URL;
    }
    public void setURL(String URL) {
        this.URL = URL;
    }
    public String getUser() {
        return user;
    }
    public void setUser(String user) {
        this.user = user;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public int getMaxConnection() {
        return maxConnection;
    }
    public void setMaxConnection(int maxConnection) {
        this.maxConnection = maxConnection;
    }
    public String getValidationQuery() {
        return validationQuery;
    }
    public void setValidationQuery(String validationQuery) {
        this.validationQuery = validationQuery;
    }
    public boolean isValidateOnCheckout() {
        return validateOnCheckout;
    }
    public void setValidateOnCheckout(boolean validateOnCheckout) {
        this.validateOnCheckout = validateOnCheckout;
    }
    public int getIdleConnectionValidationSeconds() {
        return idleConnectionValidationSeconds;
    }
    public void setIdleConnectionValidationSeconds(int idleConnectionValidationSeconds) {
        this.idleConnectionValidationSeconds = idleConnectionValidationSeconds;
    }
    public DruidDataSource getDatasource() {
        return datasource;
    }
    public void setDatasource(DruidDataSource datasource) {
        this.datasource = datasource;
    }
    public String getDiscardIdleConnectionsSeconds() {
        return discardIdleConnectionsSeconds;
    }
    public void setDiscardIdleConnectionsSeconds(String discardIdleConnectionsSeconds) {
        this.discardIdleConnectionsSeconds = discardIdleConnectionsSeconds;
    }
}

quartz.properties配置：

org.quartz.scheduler.instanceName = MyScheduler
org.quartz.threadPool.threadCount = 5
org.quartz.jobStore.class = org.quartz.impl.jdbcjobstore.JobStoreTX
org.quartz.jobStore.driverDelegateClass = org.quartz.impl.jdbcjobstore.StdJDBCDelegate
org.quartz.jobStore.tablePrefix = QRTZ_
org.quartz.jobStore.dataSource = myDS
org.quartz.dataSource.myDS.connectionProvider.class:com.acts.web.common.connection.DruidConnectionProvider
org.quartz.dataSource.myDS.driver = com.mysql.jdbc.Driver
org.quartz.dataSource.myDS.URL = jdbc:mysql://localhost:3306/acts_manage_alpha?characterEncoding=utf-8
org.quartz.dataSource.myDS.user = root
org.quartz.dataSource.myDS.password = 123
org.quartz.dataSource.myDS.maxConnection = 5