poolaction

This module is part of the Python Pool libray. It defines the class for an abstract action over a set of pool elements

Functions

get_thread_pool()

Classes

PoolAction OperationInfo

PoolActionItem

ActionContext

get_thread_pool()

Returns the global pool of threads for Sardana

Returns:the global pool of threads object Return type:taurus.core.util.ThreadPool

PoolAction

class PoolAction(main_element, name='GlobalAction')

Bases: taurus.core.util.log.Logger

A generic class to handle any type of operation (like motion or acquisition)

get_main_element()

Returns the main element for this action

Returns:sardana.pool.poolelement.PoolElement

main_element

Returns the main element for this action

Returns:sardana.pool.poolelement.PoolElement

get_pool()

Returns the pool object for thi action

Returns:sardana.pool.pool.Pool

pool

Returns the pool object for thi action

Returns:sardana.pool.pool.Pool

clear_elements()

Clears all elements from this action

add_element(element)

Adds a new element to this action.

Parameters:element (sardana.pool.poolelement.PoolElement) – the new element to be added

remove_element(element)

Removes an element from this action. If the element is not part of this action, a ValueError is raised.

Parameters:element (sardana.pool.poolelement.PoolElement) – the new element to be removed Raises:ValueError

get_elements(copy_of=False)

Returns a sequence of all elements involved in this action.

Parameters:copy_of (bool) – If False (default) the internal container of elements is returned. If True, a copy of the internal container is returned instead Returns:a sequence of all elements involved in this action. Return type:seq<sardana.pool.poolelement.PoolElement>

get_pool_controller_list()

Returns a list of all controller elements involved in this action.

Returns:a list of all controller elements involved in this action. Return type:list<sardana.pool.poolelement.PoolController>

get_pool_controllers()

Returns a dict of all controller elements involved in this action.

Returns:a dict of all controller elements involved in this action. Return type:dict<sardana.pool.poolelement.PoolController, seq<sardana.pool.poolelement.PoolElement>>

is_running()

Determines if this action is running or not

Returns:True if action is running or False otherwise Return type:bool

run(*args, **kwargs)

Runs this action

start_action(*args, **kwargs)

Start procedure for this action. Default implementation raises NotImplementedError

Raises:NotImplementedError

set_finish_hook(hook)

Attaches/Detaches a finish hook

Parameters:hook (callable or None) – a callable object or None

finish_action()

Finishes the action execution. If a finish hook is defined it safely executes it. Otherwise nothing happens

stop_action(*args, **kwargs)

Stop procedure for this action.

abort_action(*args, **kwargs)

Aborts procedure for this action

emergency_break()

Tries to execute a stop. If it fails try an abort

was_stopped()

Determines if the action has been stopped from outside

Returns:True if action has been stopped from outside or False otherwise Return type:bool

was_aborted()

Determines if the action has been aborted from outside

Returns:True if action has been aborted from outside or False otherwise Return type:bool

was_action_interrupted()

Determines if the action has been interruped from outside (either from an abort or a stop).

Returns:True if action has been interruped from outside or False otherwise Return type:bool

action_loop()

Action loop for this action. Default implementation raises NotImplementedError

Raises:NotImplementedError

read_state_info(ret=None, serial=False)

Reads state information of all elements involved in this action

Parameters:

• ret (dict) – output map parameter that should be filled with state information. If None is given (default), a new map is created an returned
• serial (bool) – If False (default) perform controller HW state requests in parallel. If True, access is serialized.

Returns:

a map containing state information per element

Return type:

dict<sardana.pool.poolelement.PoolElement, stateinfo>

raw_read_state_info(ret=None, serial=False)

Unsafe. Reads state information of all elements involved in this action

Parameters:

• ret (dict) – output map parameter that should be filled with state information. If None is given (default), a new map is created an returned
• serial (bool) – If False (default) perform controller HW state requests in parallel. If True, access is serialized.

Returns:

a map containing state information per element

Return type:

dict<sardana.pool.poolelement.PoolElement, stateinfo>

get_read_value_ctrls()

read_value(ret=None, serial=False)

Reads value information of all elements involved in this action

Parameters:

• ret (dict) – output map parameter that should be filled with value information. If None is given (default), a new map is created an returned
• serial (bool) – If False (default) perform controller HW value requests in parallel. If True, access is serialized.

Returns:

a map containing value information per element

Return type:

dict<:class:~`sardana.pool.poolelement.PoolElement`, (value object, Exception or None)>

raw_read_value(ret=None, serial=False)

Unsafe. Reads value information of all elements involved in this action

Parameters:

• ret (dict) – output map parameter that should be filled with value information. If None is given (default), a new map is created an returned
• serial (bool) – If False (default) perform controller HW value requests in parallel. If True, access is serialized.

Returns:

a map containing value information per element

Return type:

dict<:class:~`sardana.pool.poolelement.PoolElement, sardana.sardanavalue.SardanaValue >

get_read_value_loop_ctrls()

read_value_loop(ret=None, serial=False)

Reads value information of all elements involved in this action

Parameters:

• ret (dict) – output map parameter that should be filled with value information. If None is given (default), a new map is created an returned
• serial (bool) – If False (default) perform controller HW value requests in parallel. If True, access is serialized.

Returns:

a map containing value information per element

Return type:

dict<:class:~`sardana.pool.poolelement.PoolElement`, (value object, Exception or None)>

raw_read_value_loop(ret=None, serial=False)

Unsafe. Reads value information of all elements involved in this action

Parameters:

• ret (dict) – output map parameter that should be filled with value information. If None is given (default), a new map is created an returned
• serial (bool) – If False (default) perform controller HW value requests in parallel. If True, access is serialized.

Returns:

a map containing value information per element

Return type:

dict<:class:~`sardana.pool.poolelement.PoolElement, sardana.sardanavalue.SardanaValue >

OperationInfo

class OperationInfo

Bases: object

Stores synchronization data for a certain operation

init(count)

Initializes this operation with a certain count

wait(timeout=None)

waits for the operation to finish

finish_one()

Notifies this operation that one step was finished

acquire()

Acquires this operation lock

release()

Releases this operation lock

PoolActionItem

class PoolActionItem(element)

Bases: object

The base class for an atomic action item

get_element()

Returns the element associated with this item

set_element(element)

Sets the element for this item

element

Returns the element associated with this item

ActionContext

class ActionContext(pool_action)

Bases: object

Stores an atomic action context

enter()

Enters operation

exit()

Leaves operation