private async Task RunProgressLoopAsync(CancellationToken cancelToken)
{
//Pici.Log.debug(typeof(SearchSession), "enter progress loop");
try
{
while (!cancelToken.IsCancellationRequested && Status.progress < 1)
{
SearchStatus newStatus = await PP2_Stat(cancelToken);
if (Status.progress < newStatus.progress ||
Status.hits < newStatus.hits ||
Status.records < newStatus.records)
{
Status = newStatus;
}
//delay with cancellation
await Task.Delay(Pazpar2Settings.DELAY_STAT_REQUEST, cancelToken);
}
}
catch (OperationCanceledException)
{
throw;
}
catch (Exception ex)
{
Pici.Log.error(typeof(SearchSession), "ping loop error ", ex);
throw;
}
//Pici.Log.debug(typeof(SearchSession), "exit progress loop \r\n");
}
private async Task <SearchStatus> PP2_Stat(CancellationToken cancelToken)
{
try
{
cancelToken.ThrowIfCancellationRequested();
using (Stream stream = await UrlHelper.GetStatUrl(ID.ToString()).GetStreamAsync())
{
SearchStatus newStatus = await Async.DeserializeXml <SearchStatus>(serializerPazPar2Stat, stream, Pazpar2Settings.LOG_HTTP_RESPONSES);
//cancel if requested
cancelToken.ThrowIfCancellationRequested();
return(newStatus);
}
}
catch (OperationCanceledException)
{
throw;
}
catch (Exception ex)
{
if (ex.IsCanceledException())
{
//do nothing here
}
else
{
Pici.Log.error(typeof(SearchSession), "stat request error", ex);
}
throw;
}
}
private async Task RunQuery(SearchRequest sr)
{
bool successful = false;
try
{
//cancel running request
RunQueryCancelTokenSource.Cancel();
RunQueryCancelTokenSource = new CancellationTokenSource();
CancellationTokenSource CancelTokenSource =
RunQueryCancelTokenSource.JoinToLinked(Callback.CancellationToken.Value);
//wait & lock
await RunQuerySemaphore.WaitAsync(CancelTokenSource.Token);
//reset progress
IsRunningQuery = true;
Status = new SearchStatus();
if (QueryStarted != null)
{
QueryStarted(sr);
}
//running query
Pici.Log.debug(typeof(SearchSession), "running query");
await PP2_Query(sr);
CancelTokenSource.ThrowIfCancellationRequested();
// run 'termlist' loop
Task termlistLoopTask = RunTermslistLoopAsync(CancelTokenSource.Token);
// run 'stat' loop (show, record)
Task progressLoopTask = RunProgressLoopAsync(CancelTokenSource.Token);
//wait all
Task[] tasks = new Task[] { termlistLoopTask, progressLoopTask };
await Task.WhenAll(tasks);
CancelTokenSource.ThrowIfCancellationRequested();
//prolong status progress updates to get changes after 100%
//Task prolongStatusProgress = ProlongStatusProgressAfterFinish(CancelTokenSource.Token);
successful = true;
}
catch (OperationCanceledException)
{
Pici.Log.debug(typeof(SearchSession), "query cancelled.");
throw;
}
catch (Exception ex)
{
Pici.Log.error(typeof(SearchSession), "error running query", ex);
throw;
}
finally
{
//update final status
//if (!successful)
// Status.progress = 2;
IsRunningQuery = false;
//unlock
RunQuerySemaphore.Release();
}
}
protected virtual void OnStatusChanged(SearchStatus oldStatus, SearchStatus newStatus)
{
RaisePropertyChanged("Status", oldStatus, newStatus);
if (StatusChanged != null)
{
StatusChanged(this, new PropertyChangedEventArgs <SearchStatus>("Status", oldStatus, newStatus));
}
Callback.ReportStatus(newStatus);
}
public void Start(List <Hit> hits, SearchRequest sr, SearchCallback <SearchStatus> statusCallback)
{
WaitUntilQueryFinishes(statusCallback.CancellationToken.Value);
this.Callback = statusCallback;
this.Request = sr;
FakeHits = hits;
Status = new SearchStatus();
if (QueryStarted != null)
{
QueryStarted(null);
}
Status = new SearchStatus()
{
progress = 1.0,
hits = hits.Count
};
}
private async Task ProlongStatusProgressAfterFinish(CancellationToken cancelToken)
{
int updateDelay = 1000;
Func <Task, Task> statusUpdateTask = async(t) =>
{
SearchStatus newStatus = await PP2_Stat(cancelToken);
//let progress grow by 0.01 after 100% was reached once
if (Status.progress >= 1.0d && newStatus.progress == 1.0d)
{
newStatus.progress = Status.progress + 0.01;
Status = newStatus;
}
};
await Task.Delay(updateDelay, cancelToken)
.ContinueWith(statusUpdateTask)
.ContinueWith(async(t) => await Task.Delay(updateDelay, cancelToken))
.ContinueWith(statusUpdateTask)
.ContinueWith(async(t) => await Task.Delay(updateDelay, cancelToken))
.ContinueWith(statusUpdateTask)
.ContinueWith(async(t) => await Task.Delay(updateDelay, cancelToken))
.ContinueWith(statusUpdateTask);
}