SharePoint中開發自定義Timer Job
1. Timer Job簡介
在SharePoint中有一個服務SharePoint timer service(owstimer.exe)，這個服務用來進行異步處理一些SharePoint的數據，創建web application等等，為了緩解站點w3wp.exe的壓力，而且Timer 服務可以說是占據了SharePoint的半邊天，沒有他那麼SharePoint將不能正常工作
2. Timer Job 作用
很多時候我們需要定期自動去處理一些數據，例如：為了不影響業務性能有些數據在非工作時間系統自動處理，那麼timer job就能夠幫我們實現這個，在SharePoint中有很多原生的job，而且也支持自定義timer job去滿足業務需求。
3. timer job的基類：
一般我們要編寫一個自定義的timer job的話，我們需要繼承SPJobDefinition ，然後重寫Execute方法，在這個方法裡面添加自己的業務邏輯代碼，如下：
public class MyTimerJobDefinition : SPJobDefinition
{
public MyTimerJobDefinition () : base() { }
public MyTimerJobDefinition (SPWebApplication webApp) :
base(SapConstant.ReminderJobName, webApp, null, SPJobLockType.Job)
{}
public override void Execute(Guid targetInstanceId)
{
//base.Execute(targetInstanceId);
try
{
SPWebApplication webApp = this.Parent as SPWebApplication;
// todo....
}
catch (Exception ex)
{
//log
}
}
public override void Delete()
{
try
{
base.Delete();
}
catch (Exception ex)
{
//log
}
}
}
4. 自定義Timer Job的安裝
在SharePoint中大多數自定義功能都是通過Feature去安裝和部署的，當然Timer Job也是不例外的， 在項目中添加一個feature，然後重寫相應的激活方法，如下：
[Guid("418ce432-d5e5-4fff-9a3f-ec46445bc105")]
public class Feature1EventReceiver : SPFeatureReceiver
{
// Uncomment the method below to handle the event raised after a feature has been activated.
public override void FeatureActivated(SPFeatureReceiverProperties properties)
{
try
{
SPWebApplication webApp = properties.Feature.Parent as SPWebApplication;
DeleteJob(webApp.JobDefinitions);
MyTimerJobDefinition simpleJob = new MyTimerJobDefinition(webApp);
SPDailySchedule schedule = new SPDailySchedule();
schedule.BeginHour = 9;
schedule.BeginMinute = 1;
schedule.BeginSecond = 1;
schedule.EndSecond = 30;
schedule.EndMinute = 6;
schedule.EndHour = 12;
simpleJob.Schedule = schedule;
simpleJob.Title = "My Custom Timer";
simpleJob.Update();
}
catch (Exception ex)
{
//log
}
}
// Uncomment the method below to handle the event raised before a feature is deactivated.
public override void FeatureDeactivating(SPFeatureReceiverProperties properties)
{
try
{
SPWebApplication webApp = properties.Feature.Parent as SPWebApplication;
DeleteJob(webApp.JobDefinitions);
}
catch (Exception ex)
{
//log
}
}
private void DeleteJob(SPJobDefinitionCollection jobs)
{
foreach (SPJobDefinition job in jobs)
{
if (job.Name.Equals("JobName",
StringComparison.OrdinalIgnoreCase))
{
job.Delete();
}
}
}
}
