finam.Adapter#

class finam.Adapter[source]#

Bases: IAdapter, Input, Output, ABC

Abstract adapter implementation.

Extend this class for adapters. See Writing adapters.

Simple derived classes overwrite _get_data().

Adapters that alter the metadata can intercept it in _get_info()

For time-dependent adapters with push-functionality, also overwrite the following:

_source_updated()
needs_push

Attributes:

has_source: Flag if this input instance has a source.
has_targets: Flag if this output instance has any targets.
info: Info: The input’s data info.
is_static: Whether the input is static
logger: Logger for this component.
logger_name: Logger name derived from source logger name and class name.
memory_limit: The memory limit for this slot
memory_location: The memory-mapping location for this slot
metadata: The adapter’s metadata.
name: Input name.
needs_pull: bool: if the adapter needs pull.
needs_push: bool: if the adapter needs push.
source: Get the input’s source output or adapter
targets: Get target inputs and adapters for this output.
time: The output’s time of the latest available data
uses_base_logger_name: Whether this class has a base_logger_name attribute.

Methods

`add_target`(target)	Add a target input or adapter for this output.
`chain`(other)	Chain outputs and adapters.
`exchange_info`([info])	Exchange the data info with the input's source.
`finalize`()	Called at the end of each run.
`get_data`(time, target)	Get the transformed data of this adapter.
`get_info`(info)	Exchange and get the output's data info.
`has_info`()	Returns if the output has a data info.
`notify_targets`(time)	Notify all targets by calling their `source_updated(time)` method.
`ping`()	Pings upstream to inform outputs about the number of connected inputs.
`pinged`(source)	Called when receiving a ping from a downstream input.
`pull_data`(time[, target])	Retrieve the data from the input's source.
`push_data`(data, time)	Push data into the output.
`push_info`(info)	Push data info into the output.
`source_updated`(time)	Informs the input that a new output is available.
`with_name`(name)	Renames the adapter and returns self.

with_name(name)[source]#: Renames the adapter and returns self.

property time#: The output’s time of the latest available data

property is_static#: Whether the input is static

property info#

The input’s data info.

Type:: Info

property needs_pull#

if the adapter needs pull.

Type:: bool

property needs_push#

if the adapter needs push.

Type:: bool

property metadata#

The adapter’s metadata. Will only be called after the connect phase from Composition.metadata.

Adapters can overwrite this property to add their own specific metadata:

import finam as fm

class MyAdapter(fm.Adapter):

    @property
    def metadata(self):
        # Get the default metadata
        md = super().metadata

        # Add your own metadata
        md["my_field"] = "some value"

        # Return the dictionary
        return md

Returns:

A dict with the following default metadata:

name - the component’s name
class - the component’s class

Return type:

dict

final push_data(data, time)[source]#

Push data into the output.

Should notify targets, and can handle the provided date.

Parameters:

data (array_like) – Data set to push.
time (datetime) – Simulation time of the data set.

final source_updated(time)[source]#

Informs the input that a new output is available.

Parameters:: time (datetime) – Simulation time of the notification.

notify_targets(time)[source]#

Notify all targets by calling their source_updated(time) method.

Parameters:: time (datetime) – Simulation time of the simulation.

_source_updated(time)[source]#

Informs the input that a new output is available.

Adapters can overwrite this method to handle incoming data.

Adapters that make use of this method to accumulate data should also overwrite needs_push to return True.

Parameters:: time (datetime) – Simulation time of the notification.

get_data(time, target)[source]#

Get the transformed data of this adapter.

Internally calls _get_data().

Parameters:

time (datetime) – Simulation time to get the data for.
target (IInput) – Requesting end point of this pull.

Returns:

Transformed data-set for the requested time.

Return type:

pint.Quantity

_get_data(time, target)[source]#

Get the transformed data of this adapter.

Adapters must overwrite this method.

Parameters:

time (datetime) – Simulation time to get the data for.
target (IInput) – Requesting end point of this pull.

Returns:

Transformed data-set for the requested time.

Return type:

pint.Quantity

get_info(info)[source]#

Exchange and get the output’s data info.

Parameters:: info (Info) – Requested data info
Returns:: Delivered data info
Return type:: Info
Raises:: FinamNoDataError – Raises the error if no info is available

_get_info(info)[source]#

Exchange and get the output’s data info.

Adapters can overwrite this method to manipulate the metadata for the output.

Parameters:: info (Info) – Requested data info
Returns:: Delivered data info
Return type:: Info

pinged(source)[source]#: Called when receiving a ping from a downstream input.

final exchange_info(info=None)[source]#

Exchange the data info with the input’s source.

Parameters:: info (Info) – request parameters
Returns:: delivered parameters
Return type:: Info

property source#

Get the input’s source output or adapter

Returns:: The input’s source.
Return type:: IOutput

property logger_name#: Logger name derived from source logger name and class name.

finalize()[source]#: Called at the end of each run. Calls _finalize().

_finalize()[source]#: Called at the end of each run. Overwrite this for cleanup.

add_target(target)#

Add a target input or adapter for this output.

Parameters:: target (IInput) – The target to add.

chain(other)#

Chain outputs and adapters.

Parameters:: other (IInput or IAdapter) – The adapter or input to add as target to this output.
Returns:: The last element of the chain.
Return type:: IOutput

has_info()#

Returns if the output has a data info.

The info is not required to be validly exchanged.

property has_source#: Flag if this input instance has a source.

property has_targets#: Flag if this output instance has any targets.

property logger#: Logger for this component.

property memory_limit#: The memory limit for this slot

property memory_location#: The memory-mapping location for this slot

property name#: Input name.

ping()#

Pings upstream to inform outputs about the number of connected inputs.

Must be called after linking and before the connect phase.

pull_data(time, target=None)#

Retrieve the data from the input’s source.

Parameters:

time (datetime) – Simulation time to get the data for.
target (IInput or None) – Requesting end point of this pull. Should be None for normal input pulls in components. Simple adapters should forward the source in Adapter._get_data(). Push-based adapters should use self in Adapter._source_updated().

Returns:

Data set for the given simulation time.

Return type:

pint.Quantity

push_info(info)#

Push data info into the output.

Parameters:: info (Info) – Delivered data info

property targets#

Get target inputs and adapters for this output.

Returns:: List of targets.
Return type:: list

property uses_base_logger_name#: Whether this class has a base_logger_name attribute. True.