/// <summary>Check and update the state of this job.</summary>
/// <remarks>
/// Check and update the state of this job. The state changes
/// depending on its current state and the states of the depending jobs.
/// </remarks>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
internal virtual ControlledJob.State CheckState()
{
lock (this)
{
if (this.state == ControlledJob.State.Running)
{
CheckRunningState();
}
if (this.state != ControlledJob.State.Waiting)
{
return(this.state);
}
if (this.dependingJobs == null || this.dependingJobs.Count == 0)
{
this.state = ControlledJob.State.Ready;
return(this.state);
}
Org.Apache.Hadoop.Mapreduce.Lib.Jobcontrol.ControlledJob pred = null;
int n = this.dependingJobs.Count;
for (int i = 0; i < n; i++)
{
pred = this.dependingJobs[i];
ControlledJob.State s = pred.CheckState();
if (s == ControlledJob.State.Waiting || s == ControlledJob.State.Ready || s == ControlledJob.State
.Running)
{
break;
}
// a pred is still not completed, continue in WAITING
// state
if (s == ControlledJob.State.Failed || s == ControlledJob.State.DependentFailed)
{
this.state = ControlledJob.State.DependentFailed;
this.message = "depending job " + i + " with jobID " + pred.GetJobID() + " failed. "
+ pred.GetMessage();
break;
}
// pred must be in success state
if (i == n - 1)
{
this.state = ControlledJob.State.Ready;
}
}
return(this.state);
}
}
/// <summary>Add a job to this jobs' dependency list.</summary>
/// <remarks>
/// Add a job to this jobs' dependency list.
/// Dependent jobs can only be added while a Job
/// is waiting to run, not during or afterwards.
/// </remarks>
/// <param name="dependingJob">Job that this Job depends on.</param>
/// <returns><tt>true</tt> if the Job was added.</returns>
public virtual bool AddDependingJob(Org.Apache.Hadoop.Mapreduce.Lib.Jobcontrol.ControlledJob
dependingJob)
{
lock (this)
{
if (this.state == ControlledJob.State.Waiting)
{
//only allowed to add jobs when waiting
if (this.dependingJobs == null)
{
this.dependingJobs = new AList <Org.Apache.Hadoop.Mapreduce.Lib.Jobcontrol.ControlledJob
>();
}
return(this.dependingJobs.AddItem(dependingJob));
}
else
{
return(false);
}
}
}
