这篇单单记录一下个人配置使用quartz的JDBC JobStoreTX的过程以及其中遇到的问题,这里的quartz是version2.2.1,数据库使用的mysql。
JDBCJobStore储存是速度比较慢的,但是也不至于很坏,通过JDBCJobStore储存于数据库的方式适用于Oracle,PostgreSQL, MySQL, MS SQLServer, HSQLDB, DB2等数据库。
在下载的文件的docs/dbTables目录下有对应建表语句,如果没有对应于应用的就自己改动来适应。这些个表都有"QRTZ"前缀,可以作为区别于别的命名。
如果你不需要绑定其他事务处理,你可以选择quartz的事务,其通过JobStoreTX来管理,这也是常用的选择,当然如果你要和你的应用容器一起管理,那你可以使用quartz的
JobStoreCMT,quartz通过JobStoreCMT来的使用来让你的应用容器管理quartz的事务。
使用JDBC连接方式(假设你使用的是StdSchedulerFactory):
这里当然选择JobStoreTX。
其次:
选定JDBC代理类,quartz里提供了StdJDBCDelegate,如果这个不能正常工作的,你可以选用其他代理类(在org.quar.impl.jdbcjobstore package或者其子包中可以找到),包括DB2v6Delegate (for DB2 version 6 and earlier), HSQLDBDelegate (for HSQLDB),MSSQLDelegate (for Microsoft SQLServer), PostgreSQLDelegate (for PostgreSQL),
WeblogicDelegate (for using JDBC drivers made by WebLogic), OracleDelegate (for using Oracle)等等。
并这样配置:
org.quartz.jobStore.driverDelegateClass = org.quartz.impl.jdbcjobstore.StdJDBCDelegate
第三:
指定前缀
org.quartz.jobStore.tablePrefix = QRTZ_
第四:
指定数据源名称:
org.quartz.jobStore.dataSource = myDS
第五:定义ConnectionProvider的实现类
这里我找了一下,quartz提供了一个org.quartz.utils.PoolingConnectionProvider,于是,我就有了如下配置:
org.quartz.dataSource.myDS.connectionProvider.class:org.quartz.utils.PoolingConnectionProvider
第六:配置数据源属性
org.quartz.dataSource.myDS.driver: com.mysql.jdbc.Driver
org.quartz.dataSource.myDS.url: jdbc:mysql://localhost:3306/quartz?useUnicode=true&characterEncoding=utf-8
org.quartz.dataSource.myDS.user: root
org.quartz.dataSource.myDS.password: root
org.quartz.dataSource.myDS.maxConnections = 30
完事,使用最简单的一个例子来跑跑,可是报错了……
Caused by: java.lang.InstantiationException: org.quartz.utils.PoolingConnectionProvider
at java.lang.Class.newInstance(Unknown Source)
at org.quartz.impl.StdSchedulerFactory.instantiate(StdSchedulerFactory.java:936)
... 3 more
跟了一下源码得到详细一点的原因:
ConnectionProvider cp = null;
try {
cp = (ConnectionProvider) loadHelper.loadClass(cpClass).newInstance();
} catch (Exception e) {
initException = new SchedulerException("ConnectionProvider class '" + cpClass
+ "' could not be instantiated.", e);
throw initException;
}
红色那行报的:
org.eclipse.debug.core.DebugException: com.sun.jdi.ClassNotLoadedException: Type has not been loaded occurred while retrieving component type of array.
百度了一把,没什么收获,看看文档,只说定义自己的这个类,但是为啥,也没有代码,为什么不告诉直接用上述的那个provider呢?
直接测试一下loadclass("org.quartz.utils.PoolingConnectionProvider");是没有问题的,那就是newInstance();的时候有问题咯。靠谱的还是JDK文档,立马去看一下,果然有收获:创建此Class 对象所表示的类的一个新实例。如同用一个带有一个空参数列表的 new
表达式实例化该类。如果该类尚未初始化,则初始化这个类。
如同空参数……
肯定是那个provider没有提供无参构造……再去看看呢,果然没有,好吧,我承认我懒了那么一丢丢。
那我再找找有没有其他的用于设置这个的吧,居然没有找到(估计没有找仔细),还是得定义一个自己的provider,没事,就参考这个provider,还是用C3P0来定义呗。
定义好后,来试试,果然顶用。以下是我的可运行代码:
quartz.properties
# Default Properties file for use by StdSchedulerFactory
# to create a Quartz Scheduler Instance, if a different
# properties file is not explicitly specified.
#
org.quartz.scheduler.instanceName: DefaultQuartzScheduler
org.quartz.scheduler.rmi.export: false
org.quartz.scheduler.rmi.proxy: false
org.quartz.scheduler.wrapJobExecutionInUserTransaction: false
org.quartz.threadPool.class: org.quartz.simpl.SimpleThreadPool
org.quartz.threadPool.threadCount: 10
org.quartz.threadPool.threadPriority: 5
org.quartz.threadPool.threadsInheritContextClassLoaderOfInitializingThread: false
org.quartz.jobStore.misfireThreshold: 60000
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: org.quartz.examples.example17.MyPoolingconnectionProvider
org.quartz.dataSource.myDS.driver: com.mysql.jdbc.Driver
org.quartz.dataSource.myDS.url: jdbc:mysql://localhost:3306/quartz?useUnicode=true&characterEncoding=utf-8
org.quartz.dataSource.myDS.user: root
org.quartz.dataSource.myDS.password: root
org.quartz.dataSource.myDS.maxConnections: 30
package org.quartz.examples.example17;
import java.beans.PropertyVetoException;
import java.sql.Connection;
import java.sql.SQLException;
import org.quartz.SchedulerException;
import org.quartz.utils.ConnectionProvider;
import com.mchange.v2.c3p0.ComboPooledDataSource;
/**
*
* @author wz
*
*/
public class MyPoolingconnectionProvider implements ConnectionProvider {
/** Default maximum number of database connections in the pool. */
public static final int DEFAULT_DB_MAX_CONNECTIONS = 10;
/** Default maximum number of database connections in the pool. */
public static final int DEFAULT_DB_MAX_CACHED_STATEMENTS_PER_CONNECTION = 120;
private String driver;
private String url;
private String user;
private String password;
private int maxConnections;
private int maxCachedStatementsPerConnection;
private int maxIdleSeconds;
private String validationQuery;
private int idleConnectionValidationSeconds;
private boolean validateOnCheckout;
private String discardIdleConnectionsSeconds;
private ComboPooledDataSource datasource;
/**
* 无参构造,必须要有[没有其他构造的话也可以不写]
*/
public MyPoolingconnectionProvider() {
}
public Connection getConnection() throws SQLException {
return datasource.getConnection();
}
public void shutdown() throws SQLException {
datasource.close();
}
/**
* 初始化方法,应该在调用其setter后调用
*/
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.maxConnections < 0) {
throw new SQLException("DBPool maxConnectins could not be created: Max connections must be greater than zero!");
}
datasource = new ComboPooledDataSource();
try {
datasource.setDriverClass(this.driver);
} catch (PropertyVetoException e) {
try {
throw new SchedulerException("Problem setting driver class name on datasource: " + e.getMessage(), e);
} catch (SchedulerException e1) {
}
}
datasource.setJdbcUrl(this.url);
datasource.setUser(this.user);
datasource.setPassword(this.password);
datasource.setMaxPoolSize(this.maxConnections);
datasource.setMinPoolSize(1);
datasource.setMaxIdleTime(maxIdleSeconds);
datasource.setMaxStatementsPerConnection(this.maxCachedStatementsPerConnection);
if (this.validationQuery != null) {
datasource.setPreferredTestQuery(this.validationQuery);
if (!validateOnCheckout)
datasource.setTestConnectionOnCheckin(true);
else
datasource.setTestConnectionOnCheckout(true);
datasource.setIdleConnectionTestPeriod(this.idleConnectionValidationSeconds);
}
}
/*-------------------------------------------------
*
* setters 如果有必要,你可以添加一些getter
* ------------------------------------------------
*/
public void setDriver(String driver) {
this.driver = driver;
}
public void setUrl(String url) {
this.url = url;
}
public void setUser(String user) {
this.user = user;
}
public void setPassword(String password) {
this.password = password;
}
public void setMaxConnections(int maxConnections) {
this.maxConnections = maxConnections;
}
public void setMaxCachedStatementsPerConnection(int maxCachedStatementsPerConnection) {
this.maxCachedStatementsPerConnection = maxCachedStatementsPerConnection;
}
public void setMaxIdleSeconds(int maxIdleSeconds) {
this.maxIdleSeconds = maxIdleSeconds;
}
public void setValidationQuery(String validationQuery) {
this.validationQuery = validationQuery;
}
public void setIdleConnectionValidationSeconds(int idleConnectionValidationSeconds) {
this.idleConnectionValidationSeconds = idleConnectionValidationSeconds;
}
public void setValidateOnCheckout(boolean validateOnCheckout) {
this.validateOnCheckout = validateOnCheckout;
}
public void setDiscardIdleConnectionsSeconds(String discardIdleConnectionsSeconds) {
this.discardIdleConnectionsSeconds = discardIdleConnectionsSeconds;
}
public void setDatasource(ComboPooledDataSource datasource) {
this.datasource = datasource;
}
protected ComboPooledDataSource getDataSource() {
return datasource;
}
}
package org.quartz.examples.example17;
import java.util.Date;
import org.quartz.DateBuilder;
import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;
import org.quartz.impl.triggers.SimpleTriggerImpl;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SimpleExample
{
public void run()
throws Exception
{
Logger log = LoggerFactory.getLogger(SimpleExample.class);
log.info("------- Initializing ----------------------");
//通过调度器工厂获取调度器,初始化工程时须指定其使用我们自己的配置文件
SchedulerFactory sf = new StdSchedulerFactory("org/quartz/examples/example17/quartz.properties");
Scheduler sched = sf.getScheduler();
//这儿clear一下,因为使用数据库储存方式时,shutdown的时候没有清除,第二次运行会报Job is already exist
sched.clear();
log.info("------- Initialization Complete -----------");
Date runTime = DateBuilder.evenMinuteDate(new Date());
log.info("------- Scheduling Job -------------------");
//创建任务详情
JobDetail job = JobBuilder.newJob(HelloJob.class).withIdentity("job1", "group1").build();
//创建触发器
SimpleTriggerImpl trigger = (SimpleTriggerImpl)TriggerBuilder.newTrigger().withIdentity("trigger1", "group1").startAt(new Date()).build();
trigger.setRepeatCount(5);
trigger.setRepeatInterval(3000);
log.info("------- Starttime = "+trigger.getStartTime()+" -----------------");
//调度器、触发器、任务,三者关联
sched.scheduleJob(job, trigger);
log.info(job.getKey() + " will run at: " + runTime);
//调度启动
sched.start();
log.info("------- Started Scheduler -----------------");
log.info("------- Waiting 1 minute... -------------");
try
{
Thread.sleep(60000L);
}
catch (Exception e)
{
}
log.info("------- Shutting Down ---------------------");
//调度关闭
sched.shutdown(true);
log.info("------- Shutdown Complete -----------------");
}
public static void main(String[] args) throws Exception
{
SimpleExample example = new SimpleExample();
example.run();
}
}
注意:
1) org.quartz.jobStore.class: org.quartz.impl.jdbcjobstore.JobStoreTX,这个配置在这儿当然是用这个,
而org.quartz.jobStore.driverDelegateClass: org.quartz.impl.jdbcjobstore.StdJDBCDelegate则根据你的数据,通常使用当前这个,如果这个不适用就去quartz里org.quar.impl.jdbcjobstore包或其子包下找找,如还是未能满足需求,就自己实现一个。
2) org.quartz.jobStore.tablePrefix: QRTZ_,这个是quartz默认的,tables_mysql.sql以及一些其他操作(比如clear等)的代码都这样写了,所以就不要去修改了。
3) org.quartz.jobStore.dataSource: myDS这个的“键”必须是org.quartz.jobStore.dataSource,而“值”随你取,但必须有。
4) dataSource的属性配置,如下几个(可以自己添加其他的对应修改provider):
org.quartz.dataSource.myDS.connectionProvider.class: org.quartz.examples.example17.MyPoolingconnectionProvider
org.quartz.dataSource.myDS.driver: com.mysql.jdbc.Driver
org.quartz.dataSource.myDS.url: jdbc:mysql://localhost:3306/quartz?useUnicode=true&characterEncoding=utf-8
org.quartz.dataSource.myDS.user: root
org.quartz.dataSource.myDS.password: root
org.quartz.dataSource.myDS.maxConnections: 30
它们的“键”必须是
org.quartz.dataSource."+yourdatasourcename+"."+yourProvider#datamembername
原因如下:
String[] dsNames = cfg.getPropertyGroups(PROP_DATASOURCE_PREFIX);
for (int i = 0; i < dsNames.length; i++) {
PropertiesParser pp = new PropertiesParser(cfg.getPropertyGroup(
PROP_DATASOURCE_PREFIX + "." + dsNames[i], true));
String cpClass = pp.getStringProperty(PROP_CONNECTION_PROVIDER_CLASS, null);
// custom connectionProvider...
if(cpClass != null) {
ConnectionProvider cp = null;
try {
cp = (ConnectionProvider) loadHelper.loadClass(cpClass).newInstance();
} catch (Exception e) {
initException = new SchedulerException("ConnectionProvider class '" + cpClass
+ "' could not be instantiated.", e);
throw initException;
}
try {
// remove the class name, so it isn't attempted to be set
pp.getUnderlyingProperties().remove(
PROP_CONNECTION_PROVIDER_CLASS);
setBeanProps(cp, pp.getUnderlyingProperties());
cp.initialize();
} catch (Exception e) {
initException = new SchedulerException("ConnectionProvider class '" + cpClass
+ "' props could not be configured.", e);
throw initException;
}
dbMgr = DBConnectionManager.getInstance();
dbMgr.addConnectionProvider(dsNames[i], cp);
}