/// <summary>
/// Get Job Details by Job Id
/// </summary>
/// <param name="jobId">
/// JobId of the job
/// </param>
/// <returns>
/// Job Details if job found else null
/// </returns>
public ScheduledJobDetails GetJobById(Guid jobId)
{
string rowKeyFilter = TableQuery.GenerateFilterCondition("RowKey", QueryComparisons.Equal,
ScheduledJobEntity.GetRowKey(jobId));
TableQuery <ScheduledJobEntity> query = new TableQuery <ScheduledJobEntity>().Where(rowKeyFilter);
IEnumerable <ScheduledJobEntity> entities = azureTableProvider.Table.ExecuteQuery(query);
foreach (ScheduledJobEntity scheduledJobEntity in entities)
{
ScheduledJobDetails details = new ScheduledJobDetails()
{
JobId = new Guid(scheduledJobEntity.RowKey),
JobState =
(ScheduledJobState)Enum.Parse(typeof(ScheduledJobState), scheduledJobEntity.State),
JobType =
(ScheduledJobType)Enum.Parse(typeof(ScheduledJobType), scheduledJobEntity.PartitionKey),
Recurrence = JsonConvert.DeserializeObject <Recurrence>(scheduledJobEntity.Recurrence),
StartTime = scheduledJobEntity.StartTime,
Version = scheduledJobEntity.Version
};
if (scheduledJobEntity.Payload != null)
{
details.Payload =
JsonConvert.DeserializeObject <ConcurrentDictionary <string, string> >(scheduledJobEntity.Payload);
}
return(details);
}
return(null);
}
/// <summary>
/// Mark the job iteration as complete.
/// </summary>
/// <param name="jobDetails">
/// The details of the job which we want to mark as complete
/// </param>
/// <returns>
/// Task wrapper for async operation
/// </returns>
public async Task CompleteJobIterationAsync(ScheduledJobDetails jobDetails)
{
Log.Info("Incoming request to complete a job iteration \r\n" +
"details: {0}", jobDetails);
await DeleteJobFromQueueAsync(jobDetails).ConfigureAwait(false);
Log.Verbose("Job {0} deleted from the queue", jobDetails.JobId);
TableResult result = await azureTableProvider.RetrieveAsync(
ScheduledJobEntity.GetPartitionKey(jobDetails.JobType),
ScheduledJobEntity.GetRowKey(jobDetails.JobId));
ScheduledJobEntity entity = (ScheduledJobEntity)result.Result;
if (entity != null)
{
entity.LastRunTime = DateTime.UtcNow;
entity.Count = entity.Count + 1;
if (jobDetails.Payload != null)
{
entity.Payload = JsonConvert.SerializeObject(jobDetails.Payload);
}
else
{
entity.Payload = null;
}
Recurrence scheduledRecurrence = JsonConvert.DeserializeObject <Recurrence>(entity.Recurrence);
if (entity.Count == scheduledRecurrence.Count)
{
entity.State = Enum.GetName(typeof(ScheduledJobState), ScheduledJobState.Completed);
Log.Verbose("Job {0} completed all scheduled runs. Will be marked complete ", jobDetails.JobId);
// if we are marking job as complete, delete payload. It unnecessary inflates the job size
// and we don't need it.
// Max size for each property is 64K !
entity.Payload = null;
}
else
{
// schedule next recurrence
AzureScheduledJobDetails details = jobDetails as AzureScheduledJobDetails;
if (details != null)
{
details.QueueMessage = null;
// TODO : Include StartTime in calculation ... else drift will increase
await azureQueueProvider.EnqueueAsync(new CloudQueueMessage(JsonConvert.SerializeObject(details)),
scheduledRecurrence.ToTimeSpan()).ConfigureAwait(false);
Log.Verbose("Job {0} completed {1} runs, scheduling the next due occurrence", jobDetails.JobId, entity.Count);
}
}
await azureTableProvider.UpdateAsync(entity).ConfigureAwait(false);
}
Log.Info("Successfully marked iteration of job {0} as complete", jobDetails.JobId);
}
/// <summary>
/// Get a job off the queue to process if available
/// </summary>
/// <returns>
/// Details of the job to run, or NULL if none present
/// </returns>
public async Task <ScheduledJobDetails> GetJobToProcessAsync()
{
// Get message from queue - timeout of 1 min
CloudQueueMessage message = await azureQueueProvider.DequeueAsync(TimeSpan.FromMinutes(1)).ConfigureAwait(false);
ScheduledJobDetails details = null;
//TODO: Add logic to log these every _n_ times instead of once per polling interval (currently 50ms).
// Log.Verbose("Incoming request to get a job to be processed");
if (message != null)
{
// Get entity from table
details = AzureScheduledJobDetails.FromCloudQueueMessage(message);
TableResult result = await azureTableProvider.RetrieveAsync(
ScheduledJobEntity.GetPartitionKey(details.JobType),
ScheduledJobEntity.GetRowKey(details.JobId)).ConfigureAwait(false);
ScheduledJobEntity entity = (ScheduledJobEntity)result.Result;
if (entity == null)
{
// something bad happened in scheduling
Log.Critical(500, "Deleting Job from queue as entity does not exist , jobId {0} ", details.JobId);
await DeleteJobFromQueueAsync(details).ConfigureAwait(false);
details = null;
}
else
{
int currentVersion = entity.Version;
// if version mismatch, that means job has been updated
// We should delete the current message from the Queue
if (currentVersion != details.Version)
{
await DeleteJobFromQueueAsync(details).ConfigureAwait(false);
details = null;
}
}
}
if (details != null)
{
Log.Info("Job to be processed retrieved \r\n" +
"details : {0}", details);
}
return(details);
}
/// <summary>
/// Update the job payload to the new payload specified
/// </summary>
/// <param name="jobDetails">
/// Details of the job to be updated
/// </param>
/// <returns>
/// Task wrapper for async operation
/// </returns>
/// <remarks>
/// This update is done in place, hence queue order is not changed.
/// Please be aware that this call only updates the payload.
/// Imp : NOT THREADSAFE. So multiple calls can arrive out of order
/// to make payload be off sync. Be careful if you have to use it.
/// </remarks>
public async Task UpdateJobPayload(ScheduledJobDetails jobDetails)
{
if (jobDetails == null)
{
throw new SchedulerException("JobDetails cannot be null");
}
string errorMessage;
if (!jobDetails.ValidateUpdate(out errorMessage))
{
throw new SchedulerException(errorMessage);
}
Log.Info("Incoming request to update payload of a job \r\n" +
"details: {0}", jobDetails);
TableResult result = await azureTableProvider.RetrieveAsync(
ScheduledJobEntity.GetPartitionKey(jobDetails.JobType),
ScheduledJobEntity.GetRowKey(jobDetails.JobId)).ConfigureAwait(false);
ScheduledJobEntity entity = (ScheduledJobEntity)result.Result;
if (entity != null)
{
entity.Payload = JsonConvert.SerializeObject(jobDetails.Payload);
await azureTableProvider.UpdateAsync(entity).ConfigureAwait(false);
AzureScheduledJobDetails azureJobDetails = jobDetails as AzureScheduledJobDetails;
CloudQueueMessage message = AzureScheduledJobDetails.ToCloudQueueMessage(azureJobDetails);
// azureJobDetails.QueueMessage = null;
message.SetMessageContent(JsonConvert.SerializeObject(jobDetails));
await azureQueueProvider.UpdateAsync(message).ConfigureAwait(false);
}
Log.Info("Successfully updated payload of job {0} ", jobDetails.JobId);
}
/// <summary>
/// Update the job. This will requeue the message depending on the Recurrence.
/// Use this to:
/// 1. Update State :
/// a. Set to Pause to pause a job
/// b. Set to Running to resume a job
/// c. Set to Canceled to cancel a job
/// 2. Update payload.
/// 3. Update Recurrence Schedule
/// 4. Update description
/// </summary>
/// <param name="jobDetails">
/// Details to be updated
/// </param>
/// <returns>
/// Task wrapper for async operation
/// </returns>
public async Task UpdateJobAsync(ScheduledJobDetails jobDetails)
{
if (jobDetails == null)
{
throw new SchedulerException("JobDetails cannot be null");
}
string errorMessage;
if (!jobDetails.ValidateUpdate(out errorMessage))
{
throw new SchedulerException(errorMessage);
}
Log.Info("Incoming request to update a job \r\n" +
"details: {0}", jobDetails);
TableResult result = await azureTableProvider.RetrieveAsync(
ScheduledJobEntity.GetPartitionKey(jobDetails.JobType),
ScheduledJobEntity.GetRowKey(jobDetails.JobId)).ConfigureAwait(false);
ScheduledJobEntity entity = (ScheduledJobEntity)result.Result;
if (entity != null)
{
// start time cannot be changed.
// If we need to change start time, cancel this job and create a new one.
jobDetails.StartTime = entity.StartTime;
// always update state
entity.State = Enum.GetName(typeof(ScheduledJobState), jobDetails.JobState);
// always increment version number
entity.Version = entity.Version + 1;
// update the payload if needed
if (jobDetails.Payload != null)
{
entity.Payload = JsonConvert.SerializeObject(jobDetails.Payload);
}
else
{
entity.Payload = null;
}
// update recurrence if needed
if (jobDetails.Recurrence != null)
{
entity.Recurrence = JsonConvert.SerializeObject(jobDetails.Recurrence);
}
// udate description
entity.JobDescription = jobDetails.JobDescription;
//update table
await azureTableProvider.UpdateAsync(entity).ConfigureAwait(false);
//queue a new message with updated version if the status is supposed to be Running
if (jobDetails.JobState == ScheduledJobState.Running)
{
// when should we run the job
TimeSpan whenToRun = jobDetails.Recurrence.ToTimeSpan();
jobDetails.Version = entity.Version;
await azureQueueProvider.EnqueueAsync(
new CloudQueueMessage(JsonConvert.SerializeObject(jobDetails)),
whenToRun).ConfigureAwait(false);
}
}
Log.Info("Successfully updated job {0} ", jobDetails.JobId);
}