【Quartz】插件的使用

前些天發現了一個巨牛的人工智能學習網站，通俗易懂，風趣幽默，忍不住分享一下給大家。點擊跳轉到教程。

? Quartz 框架提供了幾種用于擴展平臺能力的方式。通過使用各種 "鉤子" (通常指的就是擴展點)，Quartz 變得很容易被擴展和定制化來適應你的需要。其中一個最簡單的擴展框架的方法就是使用 Quartz 插件。本章就來看看如何使用插件機制讓 Quartz 進入到之前 Quartz 用戶沒去過的領域。

一、使用Quartz自帶插件范例

?? 下面將使用插件實現從XML得到JOB，不用手工的把job和trigger加到Scheduler中去再來運行，這樣就很方便。如果要更改任務，直接在xml中配置就可以了。不用再寫java代碼。

1、首先是job類：

import java.util.Date;
import java.util.Set;import org.quartz.DisallowConcurrentExecution;
import org.quartz.InterruptableJob;
import org.quartz.Job;
import org.quartz.JobDataMap;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.quartz.JobKey;
import org.quartz.PersistJobDataAfterExecution;
import org.quartz.UnableToInterruptJobException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;@PersistJobDataAfterExecution
@DisallowConcurrentExecution
public class SimpleJob implements Job {private static Logger log = LoggerFactory.getLogger(SimpleJob.class);private JobKey jobkey=null;@Overridepublic void execute(JobExecutionContext context) throws JobExecutionException {jobkey = context.getJobDetail().getKey();log.info("Excuting job: " + jobkey + " executing at " + new Date()+" fire by: "+context.getTrigger().getKey());if(context.getMergedJobDataMap().size()>0){Set<String>  keys=	context.getMergedJobDataMap().keySet();for (String key : keys) {String value= context.getMergedJobDataMap().getString(key);log.info(" jobdatamap entry: "+key+" = "+value);}context.setResult("hello");}}}

2、job觸發時間配置，使用quartz_data.xml

<?xml version="1.0" encoding="UTF-8"?>
<job-scheduling-data xmlns="http://www.quartz-scheduler.org/xml/JobSchedulingData"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.quartz-scheduler.org/xml/JobSchedulingData http://www.quartz-scheduler.org/xml/job_scheduling_data_1_8.xsd"version="1.8"><pre-processing-commands><delete-jobs-in-group>*</delete-jobs-in-group>  <!-- clear all jobs in scheduler --><delete-triggers-in-group>*</delete-triggers-in-group> <!-- clear all triggers in scheduler --></pre-processing-commands><processing-directives><!-- if there are any jobs/trigger in scheduler of same name (as in this file), overwrite them --><overwrite-existing-data>true</overwrite-existing-data><!-- if there are any jobs/trigger in scheduler of same name (as in this file), and over-write is false, ignore them rather then generating an error --><ignore-duplicates>false</ignore-duplicates> </processing-directives><schedule><job><name>TestJob1</name><job-class>com.mucfc.SimpleJob</job-class></job><job><name>TestDurableJob</name><job-class>com.mucfc.SimpleJob</job-class><durability>true</durability><recover>false</recover></job><trigger><simple><name>TestSimpleTrigger1AtFiveSecondInterval</name><job-name>TestJob1</job-name><repeat-count>-1</repeat-count> <!-- repeat indefinitely  --><repeat-interval>5000</repeat-interval>  <!--  every 5 seconds --></simple></trigger><job><name>TestJob2</name><group>GroupOfTestJob2</group><description>This is the description of TestJob2</description><job-class>com.mucfc.SimpleJob</job-class><durability>false</durability><recover>true</recover><job-data-map><entry><key>someKey</key><value>someValue</value></entry><entry><key>someOtherKey</key><value>someOtherValue</value></entry></job-data-map></job><trigger><simple><name>TestSimpleTrigger2AtTenSecondIntervalAndFiveRepeats</name><group>GroupOfTestJob2Triggers</group><job-name>TestJob2</job-name><job-group>GroupOfTestJob2</job-group><start-time>2010-02-09T10:15:00</start-time><misfire-instruction>MISFIRE_INSTRUCTION_RESCHEDULE_NOW_WITH_EXISTING_REPEAT_COUNT</misfire-instruction><repeat-count>5</repeat-count><repeat-interval>10000</repeat-interval></simple></trigger><trigger><cron><name>TestCronTrigger2AtEveryMinute</name><group>GroupOfTestJob2Triggers</group><job-name>TestJob2</job-name><job-group>GroupOfTestJob2</job-group><job-data-map><entry><key>someKey</key><value>overriddenValue</value></entry><entry><key>someOtherKey</key><value>someOtherOverriddenValue</value></entry></job-data-map><cron-expression>0 * * ? * *</cron-expression></cron></trigger><trigger><cron><name>TestCronTrigger2AtEveryMinuteOnThe45thSecond</name><group>GroupOfTestJob2Triggers</group><job-name>TestJob2</job-name><job-group>GroupOfTestJob2</job-group><start-time>2015-05-12T12:26:00.0</start-time><end-time>2015-05-16T12:26:00.0</end-time><misfire-instruction>MISFIRE_INSTRUCTION_SMART_POLICY</misfire-instruction><cron-expression>45 * * ? * *</cron-expression><time-zone>America/Los_Angeles</time-zone></cron></trigger></schedule>    
</job-scheduling-data>

3、配置文件


#============================================================================
# Configure Main Scheduler Properties  
#============================================================================org.quartz.scheduler.instanceName: TestScheduler
org.quartz.scheduler.instanceId: AUTOorg.quartz.scheduler.skipUpdateCheck: true#============================================================================
# Configure ThreadPool  
#============================================================================org.quartz.threadPool.class: org.quartz.simpl.SimpleThreadPool
org.quartz.threadPool.threadCount: 3
org.quartz.threadPool.threadPriority: 5#============================================================================
# Configure JobStore  
#============================================================================org.quartz.jobStore.misfireThreshold: 60000org.quartz.jobStore.class: org.quartz.simpl.RAMJobStore#org.quartz.jobStore.class: org.quartz.impl.jdbcjobstore.JobStoreTX
#org.quartz.jobStore.driverDelegateClass: org.quartz.impl.jdbcjobstore.PostgreSQLDelegate
#org.quartz.jobStore.useProperties: false
#org.quartz.jobStore.dataSource: myDS
#org.quartz.jobStore.tablePrefix: QRTZ_
#org.quartz.jobStore.isClustered: false#============================================================================
# Configure Datasources  
#============================================================================#org.quartz.dataSource.myDS.driver: org.postgresql.Driver
#org.quartz.dataSource.myDS.URL: jdbc:postgresql://localhost/dev
#org.quartz.dataSource.myDS.user: jhouse
#org.quartz.dataSource.myDS.password: 
#org.quartz.dataSource.myDS.maxConnections: 5#============================================================================
# Configure Plugins 
#============================================================================org.quartz.plugin.triggHistory.class: org.quartz.plugins.history.LoggingJobHistoryPlugin
org.quartz.plugin.jobInitializer.class: org.quartz.plugins.xml.XMLSchedulingDataProcessorPlugin
org.quartz.plugin.jobInitializer.fileNames: quartz_data.xml
org.quartz.plugin.jobInitializer.failOnFileNotFound: true
org.quartz.plugin.jobInitializer.scanInterval: 120
org.quartz.plugin.jobInitializer.wrapInUserTransaction: false

其中org.quartz.plugin.jobInitializer.class: org.quartz.plugins.xml.XMLSchedulingDataProcessorPlugin會自動加載quartz_data.xml中的trigger和job到Scheduler

3、測試

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;import org.quartz.DateBuilder;
import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.Matcher;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.SchedulerMetaData;
import org.quartz.SimpleScheduleBuilder;
import org.quartz.SimpleTrigger;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;
import org.quartz.impl.calendar.AnnualCalendar;
import org.quartz.impl.matchers.KeyMatcher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;public class PluginExample {public static void run() throws Exception {Logger log = LoggerFactory.getLogger(PluginExample.class);SchedulerFactory sf = new StdSchedulerFactory();Scheduler sche = sf.getScheduler();sche.start();try {Thread.sleep(300000L);} catch (Exception e) {}sche.shutdown();SchedulerMetaData metaData = sche.getMetaData();log.info("Executed " + metaData.getNumberOfJobsExecuted() + " jobs.");}public static void main(String[] args) {PluginExample simpleExample = new PluginExample();try {simpleExample.run();} catch (Exception e) {e.printStackTrace();}}
}

4、結果：