Source

yt.rife / main_engine.py

from functools import wraps
import pyro
import inspect

def requires_pf(func):
    @wraps(func)
    def wrap(self, *args, **kwargs):
        if self.pf is None: raise RuntimeError
        return func(self, *args, **kwargs)
    return wrap

def broadcasted_action(func):
    @wraps(func)
    def sender(self, *args, **kwargs):
        argspec = inspect.getcallargs(func, *args, **kwargs)
        msg = dict(type = func.func_name,
                   args = argspec)
        self.send(msg)
        func(self, *args, **kwargs)
    return sender

class LockstepProxy(object):
    name = None
    _run = True
    def __init__(self, name, comm = None):
        self.name = name
        if comm is None:
            raise RuntimeError
        self.comm = comm

    def send(self, msg):
        self.comm.mpi_bcast_pickled(msg)

    def receive(self, msg):
        func = getattr(self, msg['type'])
        func(**msg['args'])
        
    def runwait(self):
        while self._run:
            msg = self.comm.mpi_bcast_pickled(None)
            if msg is not None: self.receive(msg)

class VolumeRenderingHandler(LockstepProxy):
    pf = None
    name = None

    def load(self, fn, resolution = 1024):
        self.pf = load(fn)
        if self.pf is None: raise IOError(fn)
        c = (self.pf.domain_right_edge + self.pf.domain_left_edge)/2.0
        self.cam = self.pf.camera(c, [1.0, 1.0, 1.0],
                      1.0/pf['unitary'], resolution, None)

    @broadcasted_action
    @requires_pf
    def switch_view(self, normal_vector, width, center, north_vectors):
        self.cam.switch_view(normal_vector, width, center, north_vectors)

    @broadcasted_action
    @requires_pf
    def render(self):
        # In here is where we broadcast to all the other processors (if we have
        # them running!) what the view is, before we snapshot.
        # We can get this from cam.normal_vector, cam.width, cam.center cam.north_vector
        if self.cam.transfer_function is None:
            raise RuntimeError
        sn = self.cam.snapshot()
        return sn

    @broadcasted_action
    @requires_pf
    def isocontours(self, limits, nlayers, width):
        self.cam.transfer_function = ColorTransferFunction(limits)
        self.cam.transfer_function.add_layers(nlayers, w=width)

if __name__ == "__main__":
    pass
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