public void MergeSimilarTasks(Task task, out int taskCount)
{
taskCount = 1;
if (task.SupportsMerging == false)
return;
Api.JetSetCurrentIndex(session, Tasks, "mergables_by_task_type");
Api.MakeKey(session, Tasks, true, MakeKeyGrbit.NewKey);
Api.MakeKey(session, Tasks, task.Index, Encoding.Unicode, MakeKeyGrbit.None);
Api.MakeKey(session, Tasks, task.Type, Encoding.Unicode, MakeKeyGrbit.None);
// there are no tasks matching the current one, just return
if (Api.TrySeek(session, Tasks, SeekGrbit.SeekEQ) == false)
{
return;
}
Api.MakeKey(session, Tasks, true, MakeKeyGrbit.NewKey);
Api.MakeKey(session, Tasks, task.Index, Encoding.Unicode, MakeKeyGrbit.None);
Api.MakeKey(session, Tasks, task.Type, Encoding.Unicode, MakeKeyGrbit.None);
Api.JetSetIndexRange(session, Tasks, SetIndexRangeGrbit.RangeInclusive | SetIndexRangeGrbit.RangeUpperLimit);
do
{
// esent index ranges are approximate, and we need to check them ourselves as well
if (Api.RetrieveColumnAsBoolean(session, Tasks, tableColumnsCache.TasksColumns["supports_merging"]) == false)
continue;
if (Api.RetrieveColumnAsString(session, Tasks, tableColumnsCache.TasksColumns["for_index"]) != task.Index)
continue;
if (Api.RetrieveColumnAsString(session, Tasks, tableColumnsCache.TasksColumns["task_type"]) != task.Type)
continue;
try
{
var taskAsBytes = Api.RetrieveColumn(session, Tasks, tableColumnsCache.TasksColumns["task"]);
var taskType = Api.RetrieveColumnAsString(session, Tasks, tableColumnsCache.TasksColumns["task_type"], Encoding.Unicode);
Task existingTask;
try
{
existingTask = Task.ToTask(taskType, taskAsBytes);
}
catch (Exception e)
{
logger.ErrorFormat(e, "Could not create instance of a task: {0}", taskAsBytes);
Api.JetDelete(session, Tasks);
continue;
}
if (task.TryMerge(existingTask) == false)
continue;
Api.JetDelete(session, Tasks);
taskCount += 1;
}
catch (EsentErrorException e)
{
if (e.Error == JET_err.WriteConflict)
continue;
throw;
}
} while (
task.SupportsMerging &&
Api.TryMoveNext(session, Tasks)
);
}
private void MergeSimilarTasks(Task task, byte [] taskId, out int taskCount)
{
taskCount = 1;
if (task.SupportsMerging == false)
return;
var keyForTaskToTryMergings = storage.Tasks["ByIndexAndType"].SkipTo(new JObject
{
{"index", task.Index},
{"type", task.Type},
})
.Where(x => new Guid(x.Value<byte[]>("id")) != new Guid(taskId))
.TakeWhile(x =>
StringComparer.InvariantCultureIgnoreCase.Equals(x.Value<string>("index"), task.Index) &&
StringComparer.InvariantCultureIgnoreCase.Equals(x.Value<string>("type"), task.Type)
);
foreach (var keyForTaskToTryMerging in keyForTaskToTryMergings)
{
var readResult = storage.Tasks.Read(keyForTaskToTryMerging);
if(readResult == null)
continue;
Task existingTask;
try
{
existingTask = Task.ToTask(readResult.Key.Value<string>("type"), readResult.Data());
}
catch (Exception e)
{
logger.ErrorFormat(e, "Could not create instance of a task: {0}", readResult.Key);
storage.Tasks.Remove(keyForTaskToTryMerging);
continue;
}
if (task.TryMerge(existingTask) == false)
continue;
storage.Tasks.Remove(keyForTaskToTryMerging);
taskCount += 1;
if (task.SupportsMerging == false)
return;
}
}
