refactor device/parameter management, immediate parameter updates, start introducing results

artiq/__init__.py

@@ -1,5 +1,5 @@
 from artiq.language.core import *
-from artiq.language.context import *
+from artiq.language.db import *
 from artiq.language.units import check_unit
 from artiq.language.units import ps, ns, us, ms, s
 from artiq.language.units import Hz, kHz, MHz, GHz

artiq/coredevice/comm_dummy.py

@@ -1,6 +1,6 @@
 from operator import itemgetter
 
-from artiq.language.context import AutoContext
+from artiq.language.db import AutoDB
 from artiq.language.units import ms, ns
 from artiq.coredevice.runtime import LinkInterface
 
@@ -14,8 +14,9 @@ class _RuntimeEnvironment(LinkInterface):
         return str(self.llvm_module)
 
 
-class Comm(AutoContext):
+class Comm(AutoDB):
-    implicit_core = False
+    class DBKeys:
+        implicit_core = False
 
     def get_runtime_env(self):
         return _RuntimeEnvironment(1*ns)

artiq/coredevice/comm_serial.py

@@ -7,7 +7,7 @@ import logging
 
 from artiq.language import core as core_language
 from artiq.language import units
-from artiq.language.context import *
+from artiq.language.db import *
 from artiq.coredevice.runtime import Environment
 from artiq.coredevice import runtime_exceptions
 from artiq.coredevice.rpc_wrapper import RPCWrapper
@@ -60,10 +60,11 @@ def _read_exactly(f, n):
     return r
 
 
-class Comm(AutoContext):
+class Comm(AutoDB):
-    serial_dev = Parameter("/dev/ttyUSB1")
+    class DBKeys:
-    baud_rate = Parameter(115200)
+        serial_dev = Parameter("/dev/ttyUSB1")
-    implicit_core = False
+        baud_rate = Parameter(115200)
+        implicit_core = False
 
     def build(self):
         self.port = serial.Serial(self.serial_dev, baudrate=115200)

artiq/coredevice/core.py

@@ -1,7 +1,7 @@
 import os
 
 from artiq.language.core import *
-from artiq.language.context import *
+from artiq.language.db import *
 
 from artiq.transforms.inline import inline
 from artiq.transforms.lower_units import lower_units
@@ -44,10 +44,11 @@ def _no_debug_unparse(label, node):
     pass
 
 
-class Core(AutoContext):
+class Core(AutoDB):
-    comm = Device("comm")
+    class DBKeys:
-    external_clock = Parameter(None)
+        comm = Device()
-    implicit_core = False
+        external_clock = Parameter(None)
+        implicit_core = False
 
     def build(self):
         self.runtime_env = self.comm.get_runtime_env()

artiq/coredevice/dds.py

@@ -1,5 +1,5 @@
 from artiq.language.core import *
-from artiq.language.context import *
+from artiq.language.db import *
 from artiq.language.units import *
 from artiq.coredevice import rtio
 
@@ -10,7 +10,7 @@ PHASE_MODE_ABSOLUTE = 1
 PHASE_MODE_TRACKING = 2
 
 
-class DDS(AutoContext):
+class DDS(AutoDB):
     """Core device Direct Digital Synthesis (DDS) driver.
 
     Controls DDS devices managed directly by the core device's runtime. It also
@@ -24,15 +24,16 @@ class DDS(AutoContext):
         the DDS device.
 
     """
-    dds_sysclk = Parameter(1*GHz)
+    class DBKeys:
-    reg_channel = Parameter()
+        dds_sysclk = Parameter(1*GHz)
-    rtio_switch = Parameter()
+        reg_channel = Argument()
+        rtio_switch = Argument()
 
     def build(self):
         self.previous_on = False
         self.previous_frequency = 0*MHz
         self.set_phase_mode(PHASE_MODE_CONTINUOUS)
-        self.sw = rtio.RTIOOut(self, channel=self.rtio_switch)
+        self.sw = rtio.RTIOOut(core=self.core, channel=self.rtio_switch)
 
     @portable
     def frequency_to_ftw(self, frequency):

artiq/coredevice/gpio.py

@@ -1,9 +1,10 @@
 from artiq.language.core import *
-from artiq.language.context import *
+from artiq.language.db import *
 
 
-class GPIOOut(AutoContext):
+class GPIOOut(AutoDB):
-    channel = Parameter()
+    class DBKeys:
+        channel = Argument()
 
     @kernel
     def on(self):

artiq/coredevice/rtio.py

@@ -1,8 +1,8 @@
 from artiq.language.core import *
-from artiq.language.context import *
+from artiq.language.db import *
 
 
-class LLRTIOOut(AutoContext):
+class LLRTIOOut(AutoDB):
     """Low-level RTIO output driver.
 
     Allows setting RTIO outputs at arbitrary times, without time unit
@@ -12,7 +12,8 @@ class LLRTIOOut(AutoContext):
     ``RTIOOut`` instead.
 
     """
-    channel = Parameter()
+    class DBKeys:
+        channel = Argument()
 
     def build(self):
         self._set_oe()
@@ -50,8 +51,9 @@ class LLRTIOOut(AutoContext):
         self.set_value(t, 0)
 
 
-class _RTIOBase(AutoContext):
+class _RTIOBase(AutoDB):
-    channel = Parameter()
+    class DBKeys:
+        channel = Argument()
 
     def build(self):
         self.previous_timestamp = int64(0)  # in RTIO cycles

artiq/devices/pdq2/__init__.py

@@ -1,5 +1,5 @@
 from artiq.language.core import *
-from artiq.language.context import *
+from artiq.language.db import *
 from artiq.language.units import *
 from artiq.coredevice import rtio
 
@@ -111,16 +111,17 @@ class _Frame:
         del self.fn
 
 
-class CompoundPDQ2(AutoContext):
+class CompoundPDQ2(AutoDB):
-    ids = Parameter()
+    class DBKeys:
-    rtio_trigger = Parameter()
+        ids = Argument()
-    rtio_frame = Parameter()
+        rtio_trigger = Argument()
+        rtio_frame = Argument()
 
     def build(self):
-        self.trigger = rtio.LLRTIOOut(self, channel=self.rtio_trigger)
+        self.trigger = rtio.LLRTIOOut(core=self.core, channel=self.rtio_trigger)
-        self.frame0 = rtio.LLRTIOOut(self, channel=self.rtio_frame[0])
+        self.frame0 = rtio.LLRTIOOut(core=self.core, channel=self.rtio_frame[0])
-        self.frame1 = rtio.LLRTIOOut(self, channel=self.rtio_frame[1])
+        self.frame1 = rtio.LLRTIOOut(core=self.core, channel=self.rtio_frame[1])
-        self.frame2 = rtio.LLRTIOOut(self, channel=self.rtio_frame[2])
+        self.frame2 = rtio.LLRTIOOut(core=self.core, channel=self.rtio_frame[2])
 
         self.frames = []
         self.current_frame = -1

artiq/language/context.py

@@ -1,179 +0,0 @@
-"""
-Device and parameter attributes.
-
-"""
-
-class _AttributeKind:
-    pass
-
-
-class Device(_AttributeKind):
-    """Represents a device for ``AutoContext`` to process.
-
-    :param type_hint: An optional string giving a hint about the type of the
-        device.
-
-    """
-    def __init__(self, type_hint=None):
-        self.type_hint = type_hint
-
-
-class NoDefault:
-    """Represents the absence of a default value for ``Parameter``.
-
-    """
-    pass
-
-
-class Parameter(_AttributeKind):
-    """Represents a parameter (from the database) for ``AutoContext``
-    to process.
-
-    :param default: Default value of the parameter to be used if not found
-        in the database.
-    :param write_db: Writes any modification of the parameter back to the
-        database.
-
-    """
-    def __init__(self, default=NoDefault, write_db=False):
-        self.default = default
-        self.write_db = write_db
-
-
-class Argument(_AttributeKind):
-    """Represents an argument (specifiable at instance creation) for
-    ``AutoContext`` to process.
-
-    :param default: Default value of the argument to be used if not specified
-        at instance creation.
-
-    """
-    def __init__(self, default=NoDefault):
-        self.default = default
-
-
-class AutoContext:
-    """Base class to automate device and parameter discovery.
-
-    Drivers and experiments should in most cases overload this class to
-    obtain the parameters and devices (including the core device) that they
-    need.
-
-    This class sets all its ``__init__`` keyword arguments as attributes. It
-    then iterates over each element in the attribute dictionary of the class,
-    and when they are abtract attributes (e.g. ``Device``, ``Parameter``),
-    requests them from the ``mvs`` (Missing Value Supplier) object.
-
-    A ``AutoContext`` instance can be used as MVS. If the requested parameter
-    is within its attributes, the value of that attribute is returned.
-    Otherwise, the request is forwarded to the parent MVS.
-
-    All keyword arguments are set as object attributes. This enables setting
-    parameters of a lower-level ``AutoContext`` object using keyword arguments
-    without having those explicitly listed in the upper-level ``AutoContext``
-    parameter list.
-
-    At the top-level, it is possible to have a MVS that issues requests to a
-    database and hardware management system.
-
-    :var implicit_core: Automatically adds a ``core`` device to the attributes.
-        Default: True.
-
-    Example:
-
-    >>> class SubExperiment(AutoContext):
-    ...     foo = Parameter()
-    ...     bar = Parameter()
-    ...
-    ...     def run(self):
-    ...         do_something(self.foo, self.bar)
-    ...
-    >>> class MainExperiment(AutoContext):
-    ...     bar1 = Parameter()
-    ...     bar2 = Parameter()
-    ...     offset = Parameter()
-    ...
-    ...     def build(self):
-    ...         self.exp1 = SubExperiment(self, bar=self.bar1)
-    ...         self.exp2 = SubExperiment(self, bar=self.bar2)
-    ...         self.exp3 = SubExperiment(self, bar=self.bar2 + self.offset)
-    ...
-    ...     def run(self):
-    ...         self.exp1.run()
-    ...         self.exp2.run()
-    ...         self.exp3.run()
-    ...
-    >>> # does not require a database.
-    >>> a = MainExperiment(foo=1, bar1=2, bar2=3, offset=0)
-    >>> # "foo" and "offset" are automatically retrieved from the database.
-    >>> b = MainExperiment(db_mvs, bar1=2, bar2=3)
-
-    """
-    implicit_core = True
-
-    def __init__(self, mvs=None, **kwargs):
-        if self.implicit_core:
-            if hasattr(self, "core"):
-                raise ValueError(
-                    "Set implicit_core to False when"
-                    " core is explicitly specified")
-            self.core = Device("core")
-
-        self.mvs = mvs
-        for k, v in kwargs.items():
-            if hasattr(self, k):
-                p = getattr(self, k)
-                if isinstance(p, Parameter) and p.write_db:
-                    self.mvs.register_parameter_wb(self, k)
-            if (not hasattr(self, k)
-                    or not isinstance(getattr(self, k), _AttributeKind)):
-                raise ValueError(
-                    "Got unexpected keyword argument: '{}'".format(k))
-            setattr(self, k, v)
-
-        for k in dir(self):
-            v = getattr(self, k)
-            if isinstance(v, _AttributeKind):
-                if isinstance(v, Argument):
-                    # never goes through MVS
-                    if v.default is NoDefault:
-                        raise AttributeError(
-                            "No value specified for argument '{}'".format(k))
-                    value = v.default
-                else:
-                    if self.mvs is None:
-                        if (isinstance(v, Parameter)
-                                and v.default is not NoDefault):
-                            value = v.default
-                        else:
-                            raise AttributeError("Attribute '{}' not specified"
-                                                 " and no MVS present".format(k))
-                    else:
-                        value = self.mvs.get_missing_value(k, v, self)
-                        if isinstance(v, Parameter) and v.write_db:
-                            self.mvs.register_parameter_wb(self, k)
-                setattr(self, k, value)
-
-        self.build()
-
-    def get_missing_value(self, name, kind, requester):
-        """Attempts to retrieve ``name`` from the object's attributes.
-        If not present, forwards the request to the parent MVS.
-
-        The presence of this method makes ``AutoContext`` act as a MVS.
-
-        """
-        try:
-            return getattr(self, name)
-        except AttributeError:
-            return self.mvs.get_missing_value(name, kind, requester)
-
-    def build(self):
-        """This is called by ``__init__`` after the parameter initialization
-        is done.
-
-        The user may overload this method to complete the object's
-        initialization with all parameters available.
-
-        """
-        pass

artiq/language/db.py

@@ -0,0 +1,145 @@
+"""
+Connection to device, parameter and result database.
+
+"""
+
+class _AttributeKind:
+    pass
+
+
+class Device(_AttributeKind):
+    """Represents a device for ``AutoDB`` to process.
+
+    """
+    pass
+
+
+class NoDefault:
+    """Represents the absence of a default value for ``Parameter``
+    and ``Argument``.
+
+    """
+    pass
+
+
+class Parameter(_AttributeKind):
+    """Represents a parameter (from the database) for ``AutoDB``
+    to process.
+
+    :param default: Default value of the parameter to be used if not found
+        in the database.
+
+    """
+    def __init__(self, default=NoDefault):
+        self.default = default
+
+
+class Argument(_AttributeKind):
+    """Represents an argument (specifiable at instance creation) for
+    ``AutoDB`` to process.
+
+    :param default: Default value of the argument to be used if not specified
+        at instance creation.
+
+    """
+    def __init__(self, default=NoDefault):
+        self.default = default
+
+
+class Result(_AttributeKind):
+    """Represents a result for ``AutoDB`` to process.
+
+    """
+    pass
+
+
+class AutoDB:
+    """Base class to automate device, parameter and result database access.
+
+    Drivers and experiments should in most cases overload this class to
+    obtain the parameters and devices (including the core device) that they
+    need, report results, and modify parameters.
+
+    :param dbh: database hub to use. If ``None``, all devices and parameters
+        must be supplied as keyword arguments, and reporting results and
+        modifying parameters is not supported.
+
+    """
+    class DBKeys:
+        pass
+
+    def __init__(self, dbh=None, **kwargs):
+        self.dbh = dbh
+
+        dbkeys = self.DBKeys()
+        if getattr(dbkeys, "implicit_core", True):
+            if hasattr(dbkeys, "core"):
+                raise ValueError(
+                    "Set implicit_core to False when"
+                    " core is explicitly specified")
+            dbkeys.core = Device()
+
+        for k, v in kwargs.items():
+            object.__setattr__(self, k, v)
+
+        for k in dir(dbkeys):
+            if k not in self.__dict__:
+                ak = getattr(dbkeys, k)
+                if isinstance(ak, Argument):
+                    if ak.default is NoDefault:
+                        raise AttributeError(
+                            "No value specified for argument '{}'".format(k))
+                    object.__setattr__(self, k, ak.default)
+                elif isinstance(ak, Device):
+                    try:
+                        dev = self.dbh.get_device(k)
+                    except KeyError:
+                        raise KeyError("Device '{}' not found".format(k))
+                    object.__setattr__(self, k, dev)
+
+        self.build()
+
+    def __getattr__(self, name):
+        ak = getattr(self.DBKeys, name)
+        if isinstance(ak, Parameter):
+            try:
+                if self.dbh is None:
+                    raise KeyError
+                return self.dbh.get_parameter(name)
+            except KeyError:
+                if ak.default is not NoDefault:
+                    return ak.default
+                else:
+                    raise AttributeError("Parameter '{}' not in database"
+                                         " and without default value"
+                                         .format(name))
+        elif isinstance(ak, Result):
+            try:
+                return self.dbh.get_result(name)
+            except KeyError:
+                raise AttributeError("Result '{}' not found".format(name))
+        else:
+            raise ValueError
+
+    def __setattr__(self, name, value):
+        try:
+            ak = getattr(self.DBKeys, name)
+        except AttributeError:
+            object.__setattr__(self, name, value)
+        else:
+            if isinstance(ak, Parameter):
+                self.dbh.set_parameter(name, value)
+            elif isinstance(ak, Result):
+                self.dbh.set_result(name, value)
+            else:
+                raise ValueError
+
+    def build(self):
+        """This is called by ``__init__`` after the parameter initialization
+        is done.
+
+        The user may overload this method to complete the object's
+        initialization with all parameters available.
+
+        """
+        pass

artiq/management/db.py

@@ -0,0 +1,106 @@
+from collections import OrderedDict, defaultdict
+import importlib
+from time import time
+
+from artiq.language.db import *
+from artiq.management import pyon
+from artiq.management.sync_struct import Notifier
+
+
+class FlatFileDB:
+    def __init__(self, filename):
+        self.filename = filename
+        self.data = Notifier(pyon.load_file(self.filename))
+        self.hooks = []
+
+    def save(self):
+        pyon.store_file(self.filename, self.data.backing_struct)
+
+    def request(self, name):
+        return self.data.backing_struct[name]
+
+    def set(self, name, value):
+        self.data[name] = value
+        self.save()
+        timestamp = time()
+        for hook in self.hooks:
+            hook.set(timestamp, name, value)
+
+    def delete(self, name):
+        del self.data[name]
+        self.save()
+        timestamp = time()
+        for hook in self.hooks:
+            hook.delete(timestamp, name)
+
+
+class SimpleHistory:
+    def __init__(self, depth):
+        self.depth = depth
+        self.history = Notifier([])
+
+    def set(self, timestamp, name, value):
+        if len(self.history.backing_struct) >= self.depth:
+            del self.history[0]
+        self.history.append((timestamp, name, value))
+
+    def delete(self, timestamp, name):
+        if len(self.history.backing_struct) >= self.depth:
+            del self.history[0]
+        self.history.append((timestamp, name))
+
+
+class ResultDB:
+    def __init__(self):
+        self.data = defaultdict(list)
+
+    def request(self, name):
+        return self.data[name]
+
+    def set(self, name, value):
+        self.data[name] = value
+
+
+def _create_device(desc, dbh):
+    module = importlib.import_module(desc["module"])
+    device_class = getattr(module, desc["class"])
+    return device_class(dbh, **desc["arguments"])
+
+
+class DBHub:
+    """Connects device, parameter and result databases to experiment.
+    Handle device driver creation and destruction.
+
+    """
+    def __init__(self, ddb, pdb, rdb):
+        self.ddb = ddb
+        self.active_devices = OrderedDict()
+
+        self.get_parameter = pdb.request
+        self.set_parameter = pdb.set
+        self.get_result = rdb.request
+        self.set_result = rdb.set
+
+    def get_device(self, name):
+        if name in self.active_devices:
+            return self.active_devices[name]
+        else:
+            desc = self.ddb.request(name)
+            while isinstance(desc, str):
+                # alias
+                desc = self.ddb.request(desc)
+            dev = _create_device(desc, self)
+            self.active_devices[name] = dev
+            return dev
+
+    def close(self):
+        """Closes all active devices, in the opposite order as they were
+        requested.
+
+        Do not use the same ``DBHub`` again after calling
+        this function.
+
+        """
+        for dev in reversed(list(self.active_devices.values())):
+            if hasattr(dev, "close"):
+                dev.close()

artiq/management/dpdb.py

@@ -1,133 +0,0 @@
-from collections import OrderedDict
-import importlib
-from time import time
-
-from artiq.language.context import *
-from artiq.management import pyon
-from artiq.management.sync_struct import Notifier
-
-
-def create_device(desc, mvs):
-    module = importlib.import_module(desc["module"])
-    device_class = getattr(module, desc["class"])
-    return device_class(mvs, **desc["parameters"])
-
-
-class DeviceParamSupplier:
-    """Supplies devices and parameters to AutoContext objects.
-
-    """
-    def __init__(self, req_device, req_parameter):
-        self.req_device = req_device
-        self.req_parameter = req_parameter
-        self.active_devices = OrderedDict()
-        # list of (requester, name)
-        self.parameter_wb = []
-
-    def get_missing_value(self, name, kind, requester):
-        if isinstance(kind, Device):
-            if name in self.active_devices:
-                return self.active_devices[name]
-            else:
-                try:
-                    desc = self.req_device(name)
-                except KeyError:
-                    raise KeyError(
-                        "Unknown device '{}' of type '{}' requested by {}"
-                        .format(name, kind.type_hint, requester))
-                try:
-                    while isinstance(desc, str):
-                        # alias
-                        desc = self.req_device(desc)
-                except KeyError:
-                    raise KeyError(
-                        "Unknown alias '{}' for device '{}' of type '{}'"
-                        " requested by {}"
-                        .format(desc, name, kind.type_hint, requester))
-                dev = create_device(desc, self)
-                self.active_devices[name] = dev
-                return dev
-        elif isinstance(kind, Parameter):
-            try:
-                return self.req_parameter(name)
-            except KeyError:
-                if kind.default is not NoDefault:
-                    return kind.default
-                else:
-                    raise KeyError("Unknown parameter: " + name)
-        else:
-            raise NotImplementedError
-
-    def register_parameter_wb(self, requester, name):
-        self.parameter_wb.append((requester, name))
-
-    def close(self):
-        """Closes all active devices, in the opposite order as they were
-        requested.
-
-        Do not use the same ``DeviceParamSupplier`` again after calling
-        this function.
-
-        """
-        for dev in reversed(list(self.active_devices.values())):
-            if hasattr(dev, "close"):
-                dev.close()
-
-
-class DeviceParamDB:
-    def __init__(self, ddb_file, pdb_file):
-        self.ddb_file = ddb_file
-        self.pdb_file = pdb_file
-        self.ddb = Notifier(pyon.load_file(self.ddb_file))
-        self.pdb = Notifier(pyon.load_file(self.pdb_file))
-        self.parameter_hooks = []
-
-    def save_ddb(self):
-        pyon.store_file(self.ddb_file, self.ddb.backing_struct)
-
-    def save_pdb(self):
-        pyon.store_file(self.pdb_file, self.pdb.backing_struct)
-
-    def req_device(self, name):
-        return self.ddb.backing_struct[name]
-
-    def set_device(self, name, description):
-        self.ddb[name] = description
-        self.save_ddb()
-
-    def del_device(self, name):
-        del self.ddb[name]
-        self.save_ddb()
-
-    def req_parameter(self, name):
-        return self.pdb.backing_struct[name]
-
-    def set_parameter(self, name, value):
-        self.pdb[name] = value
-        self.save_pdb()
-        timestamp = time()
-        for hook in self.parameter_hooks:
-            hook.set_parameter(timestamp, name, value)
-
-    def del_parameter(self, name):
-        del self.pdb[name]
-        self.save_pdb()
-        timestamp = time()
-        for hook in self.parameter_hooks:
-            hook.del_parameter(timestamp, name)
-
-
-class SimpleParameterHistory:
-    def __init__(self, depth):
-        self.depth = depth
-        self.history = Notifier([])
-
-    def set_parameter(self, timestamp, name, value):
-        if len(self.history.backing_struct) >= self.depth:
-            del self.history[0]
-        self.history.append((timestamp, name, value))
-
-    def del_parameter(self, timestamp, name):
-        if len(self.history.backing_struct) >= self.depth:
-            del self.history[0]
-        self.history.append((timestamp, name))

artiq/management/worker_impl.py

@@ -4,24 +4,24 @@ import traceback
 
 from artiq.management import pyon
 from artiq.management.file_import import file_import
-from artiq.language.context import AutoContext
+from artiq.language.db import AutoDB
-from artiq.management.dpdb import DeviceParamSupplier
+from artiq.management.db import DBHub, ResultDB
 
 
-def run(dps, file, unit, arguments):
+def run(dbh, file, unit, arguments):
     module = file_import(file)
     if unit is None:
         units = [v for k, v in module.__dict__.items()
                  if k[0] != "_"
                     and isclass(v)
-                    and issubclass(v, AutoContext)
+                    and issubclass(v, AutoDB)
-                    and v is not AutoContext]
+                    and v is not AutoDB]
         if len(units) != 1:
             raise ValueError("Found {} units in module".format(len(units)))
         unit = units[0]
     else:
         unit = getattr(module, unit)
-    unit_inst = unit(dps, **arguments)
+    unit_inst = unit(dbh, **arguments)
     unit_inst.run()
 
 
@@ -56,9 +56,13 @@ def make_parent_action(action, argnames, exception=ParentActionError):
     return parent_action
 
 
-req_device = make_parent_action("req_device", "name", KeyError)
+class ParentDDB:
-req_parameter = make_parent_action("req_parameter", "name", KeyError)
+    request = make_parent_action("req_device", "name", KeyError)
-set_parameter = make_parent_action("set_parameter", "name value")
+
+
+class ParentPDB:
+    request = make_parent_action("req_parameter", "name", KeyError)
+    set = make_parent_action("set_parameter", "name value")
 
 
 def main():
@@ -68,12 +72,11 @@ def main():
         obj = get_object()
         put_object("ack")
 
-        dps = DeviceParamSupplier(req_device, req_parameter)
+        rdb = ResultDB()
+        dbh = DBHub(ParentDDB, ParentPDB, rdb)
         try:
             try:
-                run(dps, **obj)
+                run(dbh, **obj)
-                for requester, name in dps.parameter_wb:
-                    set_parameter(name, getattr(requester, name))
             except Exception:
                 put_object({"action": "report_completed",
                             "status": "failed",
@@ -82,7 +85,7 @@ def main():
                 put_object({"action": "report_completed",
                             "status": "ok"})
         finally:
-            dps.close()
+            dbh.close()
 
 if __name__ == "__main__":
     main()

artiq/sim/devices.py

@@ -1,13 +1,14 @@
 from random import Random
 
 from artiq.language.core import delay, kernel
-from artiq.language.context import AutoContext, Parameter
+from artiq.language.db import AutoDB, Argument
 from artiq.language import units
 from artiq.sim import time
 
 
-class Core(AutoContext):
+class Core(AutoDB):
-    implicit_core = False
+    class DBKeys:
+        implicit_core = False
 
     _level = 0
 
@@ -20,8 +21,9 @@ class Core(AutoContext):
         return r
 
 
-class Input(AutoContext):
+class Input(AutoDB):
-    name = Parameter()
+    class DBKeys:
+        name = Argument()
 
     def build(self):
         self.prng = Random()
@@ -40,8 +42,9 @@ class Input(AutoContext):
         return result
 
 
-class WaveOutput(AutoContext):
+class WaveOutput(AutoDB):
-    name = Parameter()
+    class DBKeys:
+        name = Argument()
 
     @kernel
     def pulse(self, frequency, duration):
@@ -49,8 +52,9 @@ class WaveOutput(AutoContext):
         delay(duration)
 
 
-class VoltageOutput(AutoContext):
+class VoltageOutput(AutoDB):
-    name = Parameter()
+    class DBKeys:
+        name = Argument()
 
     @kernel
     def set(self, value):

artiq/test/full_stack.py

@@ -28,9 +28,10 @@ def _run_on_host(k_class, **parameters):
     k_inst.run()
 
 
-class _Primes(AutoContext):
+class _Primes(AutoDB):
-    output_list = Parameter()
+    class DBKeys:
-    maximum = Parameter()
+        output_list = Argument()
+        maximum = Argument()
 
     @kernel
     def run(self):
@@ -46,7 +47,7 @@ class _Primes(AutoContext):
                 self.output_list.append(x)
 
 
-class _Misc(AutoContext):
+class _Misc(AutoDB):
     def build(self):
         self.input = 84
         self.inhomogeneous_units = []
@@ -82,9 +83,10 @@ class _Misc(AutoContext):
         delay(10*Hz)
 
 
-class _PulseLogger(AutoContext):
+class _PulseLogger(AutoDB):
-    output_list = Parameter()
+    class DBKeys:
-    name = Parameter()
+        output_list = Argument()
+        name = Argument()
 
     def _append(self, t, l, f):
         if not hasattr(self, "first_timestamp"):
@@ -104,12 +106,15 @@ class _PulseLogger(AutoContext):
         self.off(int(now().amount*1000000000))
 
 
-class _Pulses(AutoContext):
+class _Pulses(AutoDB):
-    output_list = Parameter()
+    class DBKeys:
+        output_list = Argument()
 
     def build(self):
         for name in "a", "b", "c", "d":
-            pl = _PulseLogger(self, name=name)
+            pl = _PulseLogger(core=self.core,
+                              output_list=self.output_list,
+                              name=name)
             setattr(self, name, pl)
 
     @kernel
@@ -128,8 +133,9 @@ class _MyException(Exception):
     pass
 
 
-class _Exceptions(AutoContext):
+class _Exceptions(AutoDB):
-    trace = Parameter()
+    class DBKeys:
+        trace = Argument()
 
     @kernel
     def run(self):
@@ -170,7 +176,7 @@ class _Exceptions(AutoContext):
                 self.trace.append(104)
 
 
-class _RPCExceptions(AutoContext):
+class _RPCExceptions(AutoDB):
     def build(self):
         self.success = False
 
@@ -250,10 +256,11 @@ class ExecutionCase(unittest.TestCase):
             comm.close()
 
 
-class _RTIOLoopback(AutoContext):
+class _RTIOLoopback(AutoDB):
-    i = Device("ttl_in")
+    class DBKeys:
-    o = Device("ttl_out")
+        i = Device()
-    npulses = Parameter()
+        o = Device()
+        npulses = Argument()
 
     def report(self, n):
         self.result = n
@@ -269,8 +276,9 @@ class _RTIOLoopback(AutoContext):
         self.report(self.i.count())
 
 
-class _RTIOUnderflow(AutoContext):
+class _RTIOUnderflow(AutoDB):
-    o = Device("ttl_out")
+    class DBKeys:
+        o = Device()
 
     @kernel
     def run(self):
@@ -279,8 +287,9 @@ class _RTIOUnderflow(AutoContext):
             self.o.pulse(25*ns)
 
 
-class _RTIOSequenceError(AutoContext):
+class _RTIOSequenceError(AutoDB):
-    o = Device("ttl_out")
+    class DBKeys:
+        o = Device()
 
     @kernel
     def run(self):

doc/manual/getting_started.rst

@@ -9,15 +9,16 @@ As a very first step, we will turn on a LED on the core device. Create a file ``
     from artiq import *
 
 
-    class LED(AutoContext):
+    class LED(AutoDB):
-        led = Device("gpio_out")
+        class DBKeys:
+            led = Device()
 
         @kernel
         def run(self):
             self.led.on()
 
 
-The central part of our code is our ``LED`` class, that derives from :class:`artiq.language.core.AutoContext`. ``AutoContext`` is part of the mechanism that attaches device drivers and retrieves parameters according to a database. Abstract attributes such as ``Device("gpio_out")`` list the devices (and parameters) that our class needs in order to operate, and the names of the attributes (e.g. ``led``) are used to search the database. ``AutoContext`` replaces them with the actual device drivers (and parameter values). Finally, the ``@kernel`` decorator tells the system that the ``run`` method must be executed on the core device (instead of the host).
+The central part of our code is our ``LED`` class, that derives from :class:`artiq.language.db.AutoDB`. ``AutoDB`` is part of the mechanism that attaches device drivers and retrieves parameters according to a database. Our ``DBKeys`` class lists the devices (and parameters) that ``LED`` needs in order to operate, and the names of the attributes (e.g. ``led``) are used to search the database. ``AutoDB`` replaces them with the actual device drivers (and parameter values). Finally, the ``@kernel`` decorator tells the system that the ``run`` method must be executed on the core device (instead of the host).
 
 Copy the files ``ddb.pyon`` and ``pdb.pyon`` (containing the device and parameter databases) from the ``examples`` folder of ARTIQ into the same directory as ``led.py`` (alternatively, you can use the ``-d`` and ``-p`` options of ``artiq_run.py``). You can open the database files using a text editor - their contents are in a human-readable format.
 
@@ -37,8 +38,9 @@ Modify the code as follows: ::
     def input_led_state():
         return int(input("Enter desired LED state: "))
 
-    class LED(AutoContext):
+    class LED(AutoDB):
-        led = Device("gpio_out")
+        class DBKeys:
+            led = Device()
 
         @kernel
         def run(self):
@@ -79,8 +81,9 @@ Create a new file ``rtio.py`` containing the following: ::
 
     from artiq import *
 
-    class Tutorial(AutoContext):
+    class Tutorial(AutoDB):
-        ttl0 = Device("ttl_out")
+        class DBKeys:
+            ttl0 = Device()
 
         @kernel
         def run(self):
@@ -100,9 +103,10 @@ Try reducing the period of the generated waveform until the CPU cannot keep up w
     def print_underflow():
         print("RTIO underflow occured")
 
-    class Tutorial(AutoContext):
+    class Tutorial(AutoDB):
-        led = Device("gpio_out")
+        class DBKeys:
-        ttl0 = Device("ttl_out")
+            led = Device()
+            ttl0 = Device()
 
         @kernel
         def run(self):

doc/manual/writing_a_driver.rst

@@ -81,7 +81,7 @@ Run it as before, while the controller is running. You should see the message ap
     $ ./hello_controller.py
     message: Hello World!
 
-When using the driver in an experiment, for simple cases the ``Client`` instance can be returned by the :class:`artiq.language.core.AutoContext` mechanism and used normally as a device.
+When using the driver in an experiment, for simple cases the ``Client`` instance can be returned by the :class:`artiq.language.db.AutoDB` mechanism and used normally as a device.
 
 :warning: RPC servers operate on copies of objects provided by the client, and modifications to mutable types are not written back. For example, if the client passes a list as a parameter of an RPC method, and that method ``append()s`` an element to the list, the element is not appended to the client's list.
 

doc/slides/artiq_overview.tex

@@ -86,7 +86,7 @@ with parallel:
 \begin{frame}[fragile]
 \frametitle{\fontseries{l}\selectfont Object orientation and code reuse}
 \begin{verbatimtab}
-class Main(AutoContext):
+class Main(AutoDB):
     def build(self):
         self.ion1 = Ion(...)
         self.ion2 = Ion(...)
@@ -130,9 +130,9 @@ class Main(AutoContext):
 \begin{frame}[fragile]
 \frametitle{\fontseries{l}\selectfont Channels and parameters}
 \begin{itemize}
-\item A kernel is a method of a class that derives from the \verb!AutoContext! class
+\item A kernel is a method of a class
 \item The entry point for an experiment is called \verb!run! --- may or may not be a kernel
-\item The \verb!AutoContext! class manages channels and parameters, and sets them as attributes
+\item The \verb!AutoDB! class manages channels and parameters
 \item If channels/parameters are passed as constructor arguments, those are used
 \item Otherwise, they are looked up in the device and parameter databases
 \end{itemize}

examples/al_spectroscopy.py

@@ -1,16 +1,17 @@
 from artiq import *
 
 
-class AluminumSpectroscopy(AutoContext):
+class AluminumSpectroscopy(AutoDB):
-    mains_sync = Device("ttl_in")
+    class DBKeys:
-    laser_cooling = Device("dds")
+        mains_sync = Device()
-    spectroscopy = Device("dds")
+        laser_cooling = Device()
-    spectroscopy_b = Device("dac")
+        spectroscopy = Device()
-    state_detection = Device("dds")
+        spectroscopy_b = Device()
-    pmt = Device("ttl_in")
+        state_detection = Device()
-    spectroscopy_freq = Parameter(432*MHz)
+        pmt = Device()
-    photon_limit_low = Parameter(10)
+        spectroscopy_freq = Parameter(432*MHz)
-    photon_limit_high = Parameter(15)
+        photon_limit_low = Argument(10)
+        photon_limit_high = Argument(15)
 
     @kernel
     def run(self):

examples/ddb.pyon

@@ -2,67 +2,67 @@
     "comm": {
         "module": "artiq.coredevice.comm_serial",
         "class": "Comm",
-        "parameters": {}
+        "arguments": {}
     },
     "core": {
         "module": "artiq.coredevice.core",
         "class": "Core",
-        "parameters": {}
+        "arguments": {}
     },
 
     "led": {
         "module": "artiq.coredevice.gpio",
         "class": "GPIOOut",
-        "parameters": {"channel": 0}
+        "arguments": {"channel": 0}
     },
 
     "pmt0": {
         "module": "artiq.coredevice.rtio",
         "class": "RTIOIn",
-        "parameters": {"channel": 0}
+        "arguments": {"channel": 0}
     },
     "pmt1": {
         "module": "artiq.coredevice.rtio",
         "class": "RTIOIn",
-        "parameters": {"channel": 1}
+        "arguments": {"channel": 1}
     },
 
     "ttl0": {
         "module": "artiq.coredevice.rtio",
         "class": "RTIOOut",
-        "parameters": {"channel": 2}
+        "arguments": {"channel": 2}
     },
     "ttl1": {
         "module": "artiq.coredevice.rtio",
         "class": "RTIOOut",
-        "parameters": {"channel": 3}
+        "arguments": {"channel": 3}
     },
     "ttl2": {
         "module": "artiq.coredevice.rtio",
         "class": "RTIOOut",
-        "parameters": {"channel": 4}
+        "arguments": {"channel": 4}
     },
 
     "dds0": {
         "module": "artiq.coredevice.dds",
         "class": "DDS",
-        "parameters": {"reg_channel": 0, "rtio_switch": 5}
+        "arguments": {"reg_channel": 0, "rtio_switch": 5}
     },
     "dds1": {
         "module": "artiq.coredevice.dds",
         "class": "DDS",
-        "parameters": {"reg_channel": 1, "rtio_switch": 6}
+        "arguments": {"reg_channel": 1, "rtio_switch": 6}
     },
     "dds2": {
         "module": "artiq.coredevice.dds",
         "class": "DDS",
-        "parameters": {"reg_channel": 2, "rtio_switch": 7}
+        "arguments": {"reg_channel": 2, "rtio_switch": 7}
     },
 
     "electrodes": {
         "module": "artiq.devices.pdq2",
         "class": "CompoundPDQ2",
-        "parameters": {
+        "arguments": {
             "ids": ["qc_q1_0", "qc_q1_1", "qc_q1_2", "qc_q1_3"],
             "rtio_trigger": 7,
             "rtio_frame": (2, 3, 4)

examples/ddb_sim.pyon

@@ -2,36 +2,36 @@
     "core": {
         "module": "artiq.sim.devices",
         "class": "Core",
-        "parameters": {}
+        "arguments": {}
     },
     "mains_sync": {
         "module": "artiq.sim.devices",
         "class": "Input",
-        "parameters": {"name": "mains_sync"}
+        "arguments": {"name": "mains_sync"}
     },
     "pmt": {
         "module": "artiq.sim.devices",
         "class": "Input",
-        "parameters": {"name": "pmt"}
+        "arguments": {"name": "pmt"}
     },
     "laser_cooling": {
         "module": "artiq.sim.devices",
         "class": "WaveOutput",
-        "parameters": {"name": "laser_cooling"}
+        "arguments": {"name": "laser_cooling"}
     },
     "spectroscopy": {
         "module": "artiq.sim.devices",
         "class": "WaveOutput",
-        "parameters": {"name": "spectroscopy"}
+        "arguments": {"name": "spectroscopy"}
     },
     "spectroscopy_b": {
         "module": "artiq.sim.devices",
         "class": "VoltageOutput",
-        "parameters": {"name": "spectroscopy_b"}
+        "arguments": {"name": "spectroscopy_b"}
     },
     "state_detection": {
         "module": "artiq.sim.devices",
         "class": "WaveOutput",
-        "parameters": {"name": "state_detection"}
+        "arguments": {"name": "state_detection"}
     },
 }

examples/dds_test.py

@@ -1,11 +1,12 @@
 from artiq import *
 
 
-class DDSTest(AutoContext):
+class DDSTest(AutoDB):
-    dds0 = Device("dds")
+    class DBKeys:
-    dds1 = Device("dds")
+        dds0 = Device()
-    dds2 = Device("dds")
+        dds1 = Device()
-    led = Device("gpio_out")
+        dds2 = Device()
+        led = Device()
 
     @kernel
     def run(self):

examples/mandelbrot.py

@@ -3,7 +3,7 @@ import sys
 from artiq import *
 
 
-class Mandelbrot(AutoContext):
+class Mandelbrot(AutoDB):
     def col(self, i):
         sys.stdout.write(" .,-:;i+hHM$*#@ "[i])
 

examples/photon_histogram.py

@@ -1,13 +1,14 @@
 from artiq import *
 
 
-class PhotonHistogram(AutoContext):
+class PhotonHistogram(AutoDB):
-    bd = Device("dds")
+    class DBKeys:
-    bdd = Device("dds")
+        bd = Device()
-    pmt = Device("ttl_in")
+        bdd = Device()
+        pmt = Device()
 
-    nbins = Argument(100)
+        nbins = Argument(100)
-    repeats = Argument(100)
+        repeats = Argument(100)
 
     @kernel
     def cool_detect(self):

examples/pulse_performance.py

@@ -6,8 +6,9 @@ def print_min_period(p):
     print("Minimum square wave output period: {} ns".format(p))
 
 
-class PulsePerformance(AutoContext):
+class PulsePerformance(AutoDB):
-    ttl0 = Device("ttl_out")
+    class DBKeys:
+        ttl0 = Device()
 
     @kernel
     def run(self):

examples/rtio_skew.py

@@ -9,9 +9,10 @@ def print_failed():
     print("Pulse was not received back")
 
 
-class RTIOSkew(AutoContext):
+class RTIOSkew(AutoDB):
-    pmt0 = Device("ttl_in")
+    class DBKeys:
-    ttl0 = Device("ttl_out")
+        pmt0 = Device()
+        ttl0 = Device()
 
     @kernel
     def run(self):

examples/simple_simulation.py

@@ -1,11 +1,12 @@
 from artiq import *
 
 
-class SimpleSimulation(AutoContext):
+class SimpleSimulation(AutoDB):
-    a = Device("dds")
+    class DBKeys:
-    b = Device("dds")
+        a = Device()
-    c = Device("dds")
+        b = Device()
-    d = Device("dds")
+        c = Device()
+        d = Device()
 
     @kernel
     def run(self):
@@ -20,17 +21,16 @@ class SimpleSimulation(AutoContext):
 
 def main():
     from artiq.sim import devices as sd
-    from artiq.sim import time
 
+    core = sd.Core()
     exp = SimpleSimulation(
-        core=sd.Core(),
+        core=core,
-        a=sd.WaveOutput(name="a"),
+        a=sd.WaveOutput(core=core, name="a"),
-        b=sd.WaveOutput(name="b"),
+        b=sd.WaveOutput(core=core, name="b"),
-        c=sd.WaveOutput(name="c"),
+        c=sd.WaveOutput(core=core, name="c"),
-        d=sd.WaveOutput(name="d"),
+        d=sd.WaveOutput(core=core, name="d"),
     )
     exp.run()
-    print(time.manager.format_timeline())
 
 if __name__ == "__main__":
     main()

examples/transport.py

@@ -10,17 +10,18 @@ transport_data = dict(
     # 4 devices, 3 board each, 3 dacs each
 )
 
-class Transport(AutoContext):
+class Transport(AutoDB):
-    bd = Device("dds")
+    class DBKeys:
-    bdd = Device("dds")
+        bd = Device()
-    pmt = Device("ttl_in")
+        bdd = Device()
-    electrodes = Device("pdq")
+        pmt = Device()
+        electrodes = Device()
 
-    wait_at_stop = Parameter(100*us)
+        wait_at_stop = Parameter(100*us)
-    speed = Parameter(1.5)
+        speed = Parameter(1.5)
 
-    repeats = Argument(100)
+        repeats = Argument(100)
-    nbins = Argument(100)
+        nbins = Argument(100)
 
     def prepare(self, stop):
         t = transport_data["t"][:stop]*self.speed

frontend/artiq_client.py

@@ -113,19 +113,19 @@ def _action_cancel(remote, args):
 
 
 def _action_set_device(remote, args):
-    remote.set_device(args.name, pyon.decode(args.description))
+    remote.set(args.name, pyon.decode(args.description))
 
 
 def _action_del_device(remote, args):
-    remote.del_device(args.name)
+    remote.delete(args.name)
 
 
 def _action_set_parameter(remote, args):
-    remote.set_parameter(args.name, pyon.decode(args.value))
+    remote.set(args.name, pyon.decode(args.value))
 
 
 def _action_del_parameter(remote, args):
-    remote.del_parameter(args.name)
+    remote.delete(args.name)
 
 
 def _show_queue(queue):
@@ -233,10 +233,14 @@ def main():
             sys.exit(1)
     else:
         port = 8888 if args.port is None else args.port
-        if action in ("submit", "cancel"):
+        target_name = {
-            target_name = "master_schedule"
+            "submit": "master_schedule",
-        else:
+            "cancel": "master_schedule",
-            target_name = "master_dpdb"
+            "set_device": "master_ddb",
+            "del_device": "master_ddb",
+            "set_parameter": "master_pdb",
+            "del_parameter": "master_pdb",
+        }[action]
         remote = Client(args.server, port, target_name)
         try:
             globals()["_action_" + action](remote, args)

frontend/artiq_master.py

@@ -6,7 +6,7 @@ import atexit
 
 from artiq.management.pc_rpc import Server
 from artiq.management.sync_struct import Publisher
-from artiq.management.dpdb import DeviceParamDB, SimpleParameterHistory
+from artiq.management.db import FlatFileDB, SimpleHistory
 from artiq.management.scheduler import Scheduler
 
 
@@ -27,24 +27,26 @@ def _get_args():
 def main():
     args = _get_args()
 
-    dpdb = DeviceParamDB("ddb.pyon", "pdb.pyon")
+    ddb = FlatFileDB("ddb.pyon")
-    simplephist = SimpleParameterHistory(30)
+    pdb = FlatFileDB("pdb.pyon")
-    dpdb.parameter_hooks.append(simplephist)
+    simplephist = SimpleHistory(30)
+    pdb.hooks.append(simplephist)
 
     loop = asyncio.get_event_loop()
     atexit.register(lambda: loop.close())
 
     scheduler = Scheduler({
-        "req_device": dpdb.req_device,
+        "req_device": ddb.request,
-        "req_parameter": dpdb.req_parameter,
+        "req_parameter": pdb.request,
-        "set_parameter": dpdb.set_parameter
+        "set_parameter": pdb.set
     })
     loop.run_until_complete(scheduler.start())
     atexit.register(lambda: loop.run_until_complete(scheduler.stop()))
 
     server_control = Server({
         "master_schedule": scheduler,
-        "master_dpdb": dpdb
+        "master_ddb": ddb,
+        "master_pdb": pdb
     })
     loop.run_until_complete(server_control.start(
         args.bind, args.port_control))
@@ -53,8 +55,8 @@ def main():
     server_notify = Publisher({
         "queue": scheduler.queue,
         "periodic": scheduler.periodic,
-        "devices": dpdb.ddb,
+        "devices": ddb.data,
-        "parameters": dpdb.pdb,
+        "parameters": pdb.data,
         "parameters_simplehist": simplephist.history
     })
     loop.run_until_complete(server_notify.start(

frontend/artiq_run.py

@@ -6,14 +6,15 @@ from inspect import isclass
 from operator import itemgetter
 
 from artiq.management.file_import import file_import
-from artiq.language.context import *
+from artiq.language.db import *
 from artiq.management import pyon
-from artiq.management.dpdb import DeviceParamDB, DeviceParamSupplier
+from artiq.management.db import *
 
 
-class ELFRunner(AutoContext):
+class ELFRunner(AutoDB):
-    comm = Device("comm")
+    class DBKeys:
-    implicit_core = False
+        comm = Device()
+        implicit_core = False
 
     def run(self, filename):
         with open(filename, "rb") as f:
@@ -23,8 +24,14 @@ class ELFRunner(AutoContext):
         comm.serve(dict(), dict())
 
 
+class SimpleParamLogger:
+    def set(self, timestamp, name, value):
+        print("Parameter change: {} -> {}".format(name, value))
+
+
 def _get_args():
-    parser = argparse.ArgumentParser(description="Local running tool")
+    parser = argparse.ArgumentParser(
+        description="Local experiment running tool")
 
     parser.add_argument("-d", "--ddb", default="ddb.pyon",
                         help="device database file")
@@ -54,8 +61,11 @@ def _parse_arguments(arguments):
 def main():
     args = _get_args()
 
-    dpdb = DeviceParamDB(args.ddb, args.pdb)
+    ddb = FlatFileDB(args.ddb)
-    dps = DeviceParamSupplier(dpdb.req_device, dpdb.req_parameter)
+    pdb = FlatFileDB(args.pdb)
+    pdb.hooks.append(SimpleParamLogger())
+    rdb = ResultDB()
+    dbh = DBHub(ddb, pdb, rdb)
     try:
         if args.elf:
             if args.arguments:
@@ -69,8 +79,8 @@ def main():
                 units = [(k, v) for k, v in module.__dict__.items()
                          if k[0] != "_"
                             and isclass(v)
-                            and issubclass(v, AutoContext)
+                            and issubclass(v, AutoDB)
-                            and v is not AutoContext]
+                            and v is not AutoDB]
                 l = len(units)
                 if l == 0:
                     print("No units found in module")
@@ -92,15 +102,15 @@ def main():
                 print("Failed to parse run arguments")
                 sys.exit(1)
 
-            unit_inst = unit(dps, **arguments)
+            unit_inst = unit(dbh, **arguments)
             unit_inst.run()
 
-            if dps.parameter_wb:
+            if rdb.data:
-                print("Modified parameters:")
+                print("Results:")
-                for requester, name in dps.parameter_wb:
+                for k, v in rdb.data.items():
-                    print("{}: {}".format(name, getattr(requester, name)))
+                    print("{}: {}".format(k, v))
     finally:
-        dps.close()
+        dbh.close()
 
 if __name__ == "__main__":
     main()