mosaik 2.0a4

Example

A simple demo scenario with mosaik:

>>> import mosaik
>>>
>>> sim_config = {
...     'ExampleSim': {'python': 'example_sim.mosaik:ExampleSim'},
... }
>>>
>>> def create_scenario(world):
...     exsim1 = world.start('ExampleSim')
...     exsim2 = world.start('ExampleSim')
...
...     a = [exsim1.A(init_val=0) for i in range(3)]
...     b = exsim2.B.create(2, init_val=0)
...
...     for i, j in zip(a, b):
...         world.connect(i, j, ('val_out', 'val_in'))
>>>
>>> world = mosaik.World(sim_config)
>>> create_scenario(world)
>>> world.run(until=2)
Progress: 25.00%
Progress: 50.00%
Progress: 75.00%
Progress: 100.00%

Installation

Mosaik requires Python >= 3.3. Use pip to install it, preferably into a virtualenv:

$ pip install mosaik

Documentation, Source code and issues

The documentation is available at https://mosaik.readthedocs.org.

Please report bugs and ideas for improvment to our issue tracker.

2.0a4 – 2014-07-31

• [NEW] The model meta data may now contain the any_inputs which, if set to True, allows any attribute to be connected to that model (useful for databases and alike).

• [CHANGE] The dictionary of input values in the API’s step() call now also contains the source of a particular value. This is also usefull to for databases. This may break existing simulators.

• [CHANGE] “.” is now used as separator in full entiy IDs instead of “/” (issue #19).

2.0a3 – 2014-06-26

• [NEW] Hierarchical entities: Entities can now have a list of child entities (issue #14).

• [NEW] The World class now has a get_data() method that allows you to get data from entities while creating a scenario.

• [NEW] World.connect(a, b, ('X', 'X')) can now be simplified to World.connect(a, b, 'X').

• [NEW] Attribute Entity.full_id which uniquely identifies an entity: '<sid>/<eid>'

• [NEW] Attribute ModelFactory.meta which is the meta data dictionary of a simulator.

• [NEW] World() now accepts a configuration dictionary which can, e.g., specify the network address for mosaik.

• [NEW] Overview section for the docs

• [NEW] Description of the mosaik API in the docs

• [CHANGE] When you create entities, mosaik checks if the model parameters actually exists and raises an error if not (issue #9).

• [CHANGE] The mosaik API’s init() function now receives the simulator ID as first argument (issue #15).

• [CHANGE] The behavior of the get_related_entities() RPC that simulators can perform has been changed.

• [CHANGE] Various internal improvements

• [FIX] issue #18. Improved the error message if a Python simulator could not be imported.

• [REMOVED] Attribute Entity.rel.

2.0a2 – 2014-05-05

• [NEW] Preliminary documentation and installation instructions (https://mosaik.readthedocs.org)

• [NEW] Simulators can now set data to other simulators using the asynchronous request set_data (issue #1).

• [NEW] There is now a start timeout for external processes (issue #11).

• [CHANGE] Mosaik now raises an error if a simulator uses the wrong API version (issue #4).

• [CHANGE] Mosaik prints everything to stdout instead of using the Python logging module (issue #7).

• [FIX] issue #2. Scheduling now works properly for processes using async. requests. New keyword argument async_requests for World.connect().

• [FIX] issue #3. Local (in-process) Simulators can now also perform async. requests to mosaik (get_progress, get_related_entities, get_data, set_data).

• [FIX] issue #8. Cleaned up the code a bit.

• [FIX] issue #10. Tests for the sim manager improved.

2.0a1 – 2014-03-26

• Mosaik 2 is a complete rewrite of mosaik 1 in order to improve its maintainability and flexibility. It is still an early alpha version and neither feature complete nor bug free.

• Removed features:

  • The mosl DSL (including Eclipse xtext and Java) are now gone. Mosaik now only uses Python.

  • Mosaik now longer has executables but is now used as a library.

  • The platform manager is gone.

  • Mosaik no longer includes a database.

  • Mosaik no longer includes a web UI.

• Mosaik now consists of four core components with the following feature sets:

  • mosaik API

    • The API has bean cleaned up and simplified.

    • Simulators and control strategies share the same API.

    • There are only four calls from mosaik to a simulator: init, create, step and get_data.

    • Simulators / processes can make asynchronous requests to mosaik during a step: get_progress, get_related_entities, get_data.

    • ZeroMQ with JSON is replaced by plain network sockets with JSON.

  • Scenarios:

    • Pure Python is now used to describe scenarios. This offers you more flexibility to create complex scenarios.

    • Scenario creation simplified: Start a simulator to get a model factory. Use the factory to create model instances (entities). Connect entities. Run simulation.

    • Connection rules are are no based on a primitive connect function that only connects two entities with each other. On top of that, any connection strategy can be implemented.

  • Simulation Manager:

    • Simulators written in Python 3 can be executed in process.

    • Simulators can be started as external processes.

    • Mosaik can connect to an already running instance of a simulator. This can be used as a replacement for the now gone platform manager.

  • Simulation execution:

    • The simulation is now event-based. No schedule and no synchronization points need to be computed.

    • Simulators can have different and varying step sizes.

• Mosaik ecosystem:

  • A high-level implementation of the mosaik 2 API currently only exists for Python. See https://bitbucket.org/mosaik/mosaik-api-python.

  • mosaik-web is a simple visualization for mosaik simulations. See https://bitbucket.org/mosaik/mosaik-web.

  • mosaik-pypower is an adapter for the PYPOWER load flow analysis library. See https://bitbucket.org/mosaik/mosaik-pypower and https://github.com/rwl/PYPOWER.

  • mosaik-csv and mosaik-householdsim are simple demo simulators that you can use to “simulate” CSV data sets and load-profile based households. See https://bitbucket.org/mosaik/mosaik-csv and https://bitbucket.org/mosaik/mosaik-householdsim.

  • There is a repository containing a simple demo scenario for mosaik. See https://bitbucket.org/mosaik/mosaik-demo.

You can find information about older versions on the history page