org.eclipse.smila.taskmanager

Interface TaskManager

All Known Implementing Classes:

TaskManagerImpl

public interface TaskManager

The TaskManager.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	CONFIGURATION_BUNDLE The configuration bundle.
static java.lang.String	FINISHING_TASKS_WORKER queue/worker containing tasks to finish.
static java.lang.String	PREFIX_INTERNAL prefix for internal (worker) queues.
static java.lang.String	TASKERROR_TIME_TO_LIVE error code used in result descriptions to finish tasks.

Method Summary

Methods

Modifier and Type	Method and Description
void	addInProgressTask(Task task)
void	addTask(Task task)
void	addTaskQueue(java.lang.String workerName)
void	addTasks(java.util.Collection<Task> taskList) add tasks to the system (e.g. for manually triggered tasks).
java.util.List<Task>	filterDuplicates(java.util.List<Task> tasksToBeAdded) return new list of tasks with only those tasks from the given task list that do not have property Task.PROPERTY_UNIQUENESS_TAG set or for which currently no task is in the Todo queue that has the same uniqueness tag.
void	finishTask(java.lang.String workerName, java.lang.String taskId, ResultDescription resultDescription) Remove task from in-progress and put it into finishing queue.
void	finishTasks(java.lang.String workerName, java.util.Collection<java.lang.String> qualifiers, ResultDescription resultDescription) Finish all qualified tasks matching the qualifier condition.
long	getFailSafetyLevel()
long	getMaxScaleUp()
java.util.Map<java.lang.String,java.lang.Integer>	getScaleUpCounters()
Task	getTask(java.lang.String workerName, java.lang.String host) Get next task for worker with name workerName.
Task	getTask(java.lang.String workerName, java.lang.String host, java.util.Collection<java.lang.String> qualifiers) Get next task for worker with name workerName that match the given qualifiers.
java.util.Map<java.lang.String,TaskCounter>	getTaskCounters() Get number of tasks in all current queues.
Any	getTaskInfo(java.lang.String workerName, java.lang.String section, java.lang.String taskName) Prepares information on a task stored in the task storage.
TaskList	getTaskList(java.lang.String workerName, java.lang.String section, int maxCount) Get task list for current task pipe and sub-type.
void	keepAlive(java.lang.String workerName, java.lang.String taskId) Prevent rollback of task due to exceeded time-to-live.
void	removeTasks(AnyMap filterMap) Remove canceled tasks identified by the filter map.

Field Detail

PREFIX_INTERNAL

static final java.lang.String PREFIX_INTERNAL

prefix for internal (worker) queues.

See Also:

Constant Field Values

CONFIGURATION_BUNDLE

static final java.lang.String CONFIGURATION_BUNDLE

The configuration bundle.

See Also:

Constant Field Values

TASKERROR_TIME_TO_LIVE

static final java.lang.String TASKERROR_TIME_TO_LIVE

error code used in result descriptions to finish tasks.

See Also:

Constant Field Values

FINISHING_TASKS_WORKER

static final java.lang.String FINISHING_TASKS_WORKER

queue/worker containing tasks to finish.

See Also:

Constant Field Values

Method Detail

addTask

void addTask(Task task)
             throws TaskmanagerException

Parameters:

task - the task to add to the todo queue of its worker (contained in task)

Throws:

TaskmanagerException

addInProgressTask

void addInProgressTask(Task task)
                       throws TaskmanagerException

Parameters:

task - the task to add to the in progress queue of its worker (contained in task)

Throws:

TaskmanagerException

addTasks

void addTasks(java.util.Collection<Task> taskList)
              throws TaskmanagerException

add tasks to the system (e.g. for manually triggered tasks).

Parameters:

taskList - the list of tasks to add.

Throws:

TaskmanagerException

getTask

Task getTask(java.lang.String workerName,
           java.lang.String host)
             throws TaskmanagerException

Get next task for worker with name workerName.

Parameters:

workerName - the worker name

host - the host name where the worker is running that requested the task

Returns:

next task for worker with name workerName

Throws:

TaskmanagerException - an error while looking up or returning the task for the given worker.

getTask

Task getTask(java.lang.String workerName,
           java.lang.String host,
           java.util.Collection<java.lang.String> qualifiers)
             throws TaskmanagerException

Get next task for worker with name workerName that match the given qualifiers.

Parameters:

workerName - the worker name

host - the host name where the worker is running that requested the task

qualifiers - qualifiers to describe the task.

Returns:

Next task for worker with name workerName that match the given qualifiers.

Throws:

TaskmanagerException - an error while looking up or returning the task for the given worker.

finishTask

void finishTask(java.lang.String workerName,
              java.lang.String taskId,
              ResultDescription resultDescription)
                throws TaskmanagerException

Remove task from in-progress and put it into finishing queue.

Parameters:

workerName - the worker name

taskId - the id of the task to be finished

resultDescription - the result description for the task to be finished.

Throws:

TaskmanagerException - an error occurred while trying to finish the task.

finishTasks

void finishTasks(java.lang.String workerName,
               java.util.Collection<java.lang.String> qualifiers,
               ResultDescription resultDescription)
                 throws TaskmanagerException

Finish all qualified tasks matching the qualifier condition. Lock qualifiers

Parameters:

workerName - the worker name.

qualifiers - qualifiers describing the condition. Must not be null. If it is empty, nothing is done.

resultDescription - the result description for the tasks to be finished.

Throws:

TaskmanagerException - an exception occurred while trying to delete the tasks.

keepAlive

void keepAlive(java.lang.String workerName,
             java.lang.String taskId)
               throws TaskmanagerException

Prevent rollback of task due to exceeded time-to-live.

Parameters:

workerName - the worker name.

taskId - the ID of the task.

Throws:

TaskmanagerException - an error occurred while trying to send keep alive for this task.

getTaskCounters

java.util.Map<java.lang.String,TaskCounter> getTaskCounters()
                                                            throws TaskmanagerException

Get number of tasks in all current queues.

Returns:

task counters

Throws:

TaskmanagerException - counting fails

getTaskList

TaskList getTaskList(java.lang.String workerName,
                   java.lang.String section,
                   int maxCount)
                     throws TaskmanagerException

Get task list for current task pipe and sub-type.

Parameters:

workerName - name/id as string

section - task pipe sub-type: "inprogress" or "todo".

maxCount - max. number of tasks in return list

Returns:

task list

Throws:

TaskmanagerException - if accessing task list fails

getTaskInfo

Any getTaskInfo(java.lang.String workerName,
              java.lang.String section,
              java.lang.String taskName)
                throws TaskmanagerException

Prepares information on a task stored in the task storage.

Parameters:

workerName - pipe in which the task is stored

section - queue section ("todo" or "inprogress")

taskName - task identifier

Returns:

task information

Throws:

TaskmanagerException - on error

getFailSafetyLevel

long getFailSafetyLevel()

Returns:

number of nodes that may fail before tasks get lost.

getScaleUpCounters

java.util.Map<java.lang.String,java.lang.Integer> getScaleUpCounters()
                                                                     throws TaskmanagerException

Returns:

number of tasks in progress on different hosts.

Throws:

TaskmanagerException - on error.

getMaxScaleUp

long getMaxScaleUp()

Returns:

maximum number of tasks that should be delivered to a host. (scale up control)

removeTasks

void removeTasks(AnyMap filterMap)
                 throws TaskmanagerException

Remove canceled tasks identified by the filter map.

Parameters:

filterMap - map to identify tasks to be removed

Throws:

TaskmanagerException - an exception if something went wrong

addTaskQueue

void addTaskQueue(java.lang.String workerName)
                  throws TaskmanagerException

Parameters:

workerName - worker for which to add a task queue with given name.

Throws:

TaskmanagerException

filterDuplicates

java.util.List<Task> filterDuplicates(java.util.List<Task> tasksToBeAdded)
                                      throws TaskmanagerException

return new list of tasks with only those tasks from the given task list

• that do not have property Task.PROPERTY_UNIQUENESS_TAG set or
• for which currently no task is in the Todo queue that has the same uniqueness tag.

Parameters:

tasksToBeAdded - tasks created as follow-up tasks but not yet added to the task manager

Returns:

tasks that should be actually added to the task manager.

Throws:

TaskmanagerException