如果在Quartz.NET作业运行时我们想动态修改Job和Trigger的绑定关系，同时修改一些参数那么该怎么办呢?Quartz.NET提供了插件技术，可以通过在XML文件中对Job和Trigger的参数进行配置，然后定期去加载配置文件来实例化任务和Trigger，这样就解决了此类问题。
1 PlugInJobExample
下面给出一个示例程序，用插件XML定义的propertie来实例化一个ISchedulerFactory，配置文件名称用properties["quartz.plugin.jobInitializer.fileNames"] = "quartz_jobs.xml";语句来进行限定。具体示例代码如下：
usingSystem; usingSystem.Collections.Specialized; usingSystem.Threading; usingCommon.Logging; usingQuartz; usingQuartz.Impl; usingQuartz.Job; usingSystem.Windows.Forms; namespaceQuartzDemo{ publicclassPlugInJobExample { publicstringName { get { returnGetType().Name; } } publicvirtualISchedulerRun() { varproperties=newNameValueCollection(); properties["quartz.plugin.triggHistory.type"] ="Quartz.Plugin.History.LoggingJobHistoryPlugin"; properties["quartz.plugin.jobInitializer.type"] ="Quartz.Plugin.Xml.XMLSchedulingDataProcessorPlugin"; //配置文件名称properties["quartz.plugin.jobInitializer.fileNames"] ="quartz_jobs.xml"; properties["quartz.plugin.jobInitializer.failOnFileNotFound"] ="true"; //每隔120秒进行探查,看配置文件是否更改properties["quartz.plugin.jobInitializer.scanInterval"] ="120"; // 用插件XML定义的propertie来实例化一个ISchedulerFactoryISchedulerFactorysf=newStdSchedulerFactory(properties); ISchedulersched=sf.GetScheduler(); //启动sched.Start(); //返回returnsched; } } }
2 SimpleJob1
下面给出一个简单的Job定义，它实现了IJob接口，这里需要实现Execute(IJobExecutionContext context)方法，它可以更新另外一个窗口的相关信息。示例代码如下:
usingSystem; usingSystem.Collections.Generic; usingCommon.Logging; usingQuartz; usingQuartz.Impl; usingQuartz.Job; usingSystem.Windows.Forms; namespaceQuartzDemo{ publicclassSimpleJob1 : IJob { publicvirtualvoidExecute(IJobExecutionContextcontext) { JobKeyjobKey=context.JobDetail.Key; if (isOpen("FrmConsole")) { try { //获取当前Form1实例__instance= (FrmConsole)Application.OpenForms["FrmConsole"]; //获取当前执行的线程ID__instance.SetInfo(" - "+jobKey+"Thread ID "+System.Threading.Thread.CurrentThread.ManagedThreadId.ToString()); //通过方法更新消息__instance.SetInfo(string.Format(" - {0} exec at {1}", jobKey, System.DateTime.Now.ToString())); } catch (Exceptionex) { Console.WriteLine(ex.Message); } } // This job simply prints out its job name and theif (context.MergedJobDataMap.Count>0) { ICollection<string>keys=context.MergedJobDataMap.Keys; foreach (stringkeyinkeys) { Stringval=context.MergedJobDataMap.GetString(key); __instance.SetInfo(string.Format(" - MergedJobDataMap entry: {0} = {1}", key, val)); } } context.Result="exec ok"; } privatestaticFrmConsole__instance=null; /// <summary>/// 判断窗体是否打开/// </summary>/// <param name="appName"></param>/// <returns></returns>privateboolisOpen(stringappName) { FormCollectioncollection=Application.OpenForms; foreach (Formformincollection) { if (form.Name==appName) { returntrue; } } returnfalse; } } }
3 xml配置文件
下面第一个是简单的Trigger配置，<repeat-interval>1000</repeat-interval>表示间隔时间为1秒，<repeat-count>100</repeat-count>表示循环次数为100次。第二个用的是CronTrigger进行任务定义，周期使用CronExpression进行限定的，如<cron-expression>0/2 * * * * ?</cron-expression>。相关示例代码如下：
<job-scheduling-dataxmlns="http://quartznet.sourceforge.net/JobSchedulingData"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"version="2.0"><processing-directives><overwrite-existing-data>true</overwrite-existing-data></processing-directives><schedule><job><name>jobName1</name><group>jobGroup1</group><description>jobDesciption1</description><job-type>QuartzDemo.SimpleJob1, QuartzDemo</job-type><durable>true</durable><recover>false</recover><job-data-map><entry><key>key0</key><value>value0</value></entry><entry><key>key1</key><value>value1</value></entry><entry><key>key2</key><value>value2</value></entry></job-data-map></job><trigger><simple><name>simpleName</name><group>simpleGroup</group><description>SimpleTriggerDescription</description><job-name>jobName1</job-name><job-group>jobGroup1</job-group><start-time>2015-12-02T10:15:00.0Z</start-time><end-time>2020-05-04T18:13:51.0Z</end-time><misfire-instruction>SmartPolicy</misfire-instruction><repeat-count>100</repeat-count><repeat-interval>1000</repeat-interval></simple></trigger></schedule></job-scheduling-data>
<job-scheduling-dataxmlns="http://quartznet.sourceforge.net/JobSchedulingData"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"version="2.0"><processing-directives><overwrite-existing-data>true</overwrite-existing-data></processing-directives><schedule><job><name>SimpleJob1</name><group>myJobGroup1</group><description>SimpleJob1</description><job-type>QuartzDemo.SimpleJob1, QuartzDemo</job-type><durable>true</durable><recover>false</recover><job-data-map><entry><key>author</key><value>jackwangcumt</value></entry><entry><key>blog</key><value>isaboy</value></entry><entry><key>jobType</key><value>XML Plugin Job</value></entry></job-data-map></job><trigger><cron><name>trigger1</name><group>myTriggerGroup</group><job-name>SimpleJob1</job-name><job-group>myJobGroup1</job-group><cron-expression>0/2 * * * * ?</cron-expression></cron></trigger></schedule></job-scheduling-data>
4 效果
执行示例程序，界面如下：
可以通过修改配置文件，动态修改任务的相关参数，演示动画如下图所示：
