public RemoteTaskQueue(ILog logger,
ISerializer serializer,
IGlobalTime globalTime,
ICassandraCluster cassandraCluster,
IRtqSettings rtqSettings,
IRtqTaskDataRegistry taskDataRegistry,
IRtqProfiler rtqProfiler)
{
QueueKeyspace = rtqSettings.QueueKeyspace;
TaskTtl = rtqSettings.TaskTtl;
Logger = logger.ForContext("CassandraDistributedTaskQueue");
Serializer = serializer;
GlobalTime = globalTime;
TaskDataRegistry = taskDataRegistry;
enableContinuationOptimization = rtqSettings.EnableContinuationOptimization;
minTicksHolder = new RtqMinTicksHolder(cassandraCluster, rtqSettings);
TaskMinimalStartTicksIndex = new TaskMinimalStartTicksIndex(cassandraCluster, serializer, rtqSettings, new OldestLiveRecordTicksHolder(minTicksHolder), Logger);
var taskMetaStorage = new TaskMetaStorage(cassandraCluster, serializer, rtqSettings, Logger);
EventLogRepository = new EventLogRepository(serializer, cassandraCluster, rtqSettings, minTicksHolder);
childTaskIndex = new ChildTaskIndex(cassandraCluster, rtqSettings, serializer, taskMetaStorage);
HandleTasksMetaStorage = new HandleTasksMetaStorage(taskMetaStorage, TaskMinimalStartTicksIndex, EventLogRepository, GlobalTime, childTaskIndex, taskDataRegistry, Logger);
TaskDataStorage = new TaskDataStorage(cassandraCluster, rtqSettings, Logger);
TaskExceptionInfoStorage = new TaskExceptionInfoStorage(cassandraCluster, serializer, rtqSettings, Logger);
HandleTaskCollection = new HandleTaskCollection(HandleTasksMetaStorage, TaskDataStorage, TaskExceptionInfoStorage, rtqProfiler);
lazyRemoteLockCreator = new Lazy <IRemoteLockCreator>(() =>
{
var remoteLockImplementationSettings = CassandraRemoteLockImplementationSettings.Default(rtqSettings.QueueKeyspace, RtqColumnFamilyRegistry.LocksColumnFamilyName);
var remoteLockImplementation = new CassandraRemoteLockImplementation(cassandraCluster, serializer, remoteLockImplementationSettings);
var remoteLockerMetrics = new RemoteLockerMetrics($"{rtqSettings.QueueKeyspace}_{RtqColumnFamilyRegistry.LocksColumnFamilyName}");
return(new RemoteLocker(remoteLockImplementation, remoteLockerMetrics, Logger));
});
Profiler = rtqProfiler;
}
public TaskManipulationResult TryRerunTask([NotNull] string taskId, TimeSpan delay)
{
if (string.IsNullOrWhiteSpace(taskId))
{
throw new InvalidOperationException("TaskId is required");
}
if (delay.Ticks < 0)
{
throw new InvalidOperationException(string.Format("Invalid delay: {0}", delay));
}
if (!RemoteLockCreator.TryGetLock(taskId, out var remoteLock))
{
return(TaskManipulationResult.Failure_LockAcquiringFails);
}
using (remoteLock)
{
var task = HandleTaskCollection.TryGetTask(taskId);
if (task == null)
{
return(TaskManipulationResult.Failure_TaskDoesNotExist);
}
var taskMeta = task.Meta;
var oldTaskIndexRecord = HandleTasksMetaStorage.FormatIndexRecord(taskMeta);
taskMeta.State = TaskState.WaitingForRerun;
taskMeta.MinimalStartTicks = (Timestamp.Now + delay).Ticks;
HandleTasksMetaStorage.AddMeta(taskMeta, oldTaskIndexRecord);
if (taskMeta.NeedTtlProlongation())
{
taskMeta.SetOrUpdateTtl(TaskTtl);
HandleTaskCollection.ProlongTaskTtl(taskMeta, task.Data);
}
return(TaskManipulationResult.Success);
}
}
public TaskManipulationResult TryCancelTask([NotNull] string taskId)
{
if (string.IsNullOrWhiteSpace(taskId))
{
throw new InvalidOperationException("TaskId is required");
}
if (!RemoteLockCreator.TryGetLock(taskId, out var remoteLock))
{
return(TaskManipulationResult.Failure_LockAcquiringFails);
}
using (remoteLock)
{
var task = HandleTaskCollection.TryGetTask(taskId);
if (task == null)
{
return(TaskManipulationResult.Failure_TaskDoesNotExist);
}
var taskMeta = task.Meta;
if (taskMeta.State == TaskState.New || taskMeta.State == TaskState.WaitingForRerun || taskMeta.State == TaskState.WaitingForRerunAfterError || taskMeta.State == TaskState.InProcess)
{
var oldTaskIndexRecord = HandleTasksMetaStorage.FormatIndexRecord(taskMeta);
taskMeta.State = TaskState.Canceled;
taskMeta.FinishExecutingTicks = Timestamp.Now.Ticks;
HandleTasksMetaStorage.AddMeta(taskMeta, oldTaskIndexRecord);
return(TaskManipulationResult.Success);
}
return(TaskManipulationResult.Failure_InvalidTaskState);
}
}
public RemoteTaskInfo[] GetTaskInfos([NotNull, ItemNotNull] string[] taskIds)
{
if (taskIds.Any(string.IsNullOrWhiteSpace))
{
throw new InvalidOperationException(string.Format("Every taskId must be non-empty: {0}", string.Join(", ", taskIds)));
}
var tasks = HandleTaskCollection.GetTasks(taskIds);
var taskExceptionInfos = TaskExceptionInfoStorage.Read(tasks.Select(x => x.Meta).ToArray());
return(tasks.Select(task =>
{
var taskType = TaskDataRegistry.GetTaskType(task.Meta.Name);
var taskData = (IRtqTaskData)Serializer.Deserialize(taskType, task.Data);
return new RemoteTaskInfo(task.Meta, taskData, taskExceptionInfos[task.Meta.Id]);
}).ToArray());
}