| # |
| # Licensed to the Apache Software Foundation (ASF) under one or more |
| # contributor license agreements. See the NOTICE file distributed with |
| # this work for additional information regarding copyright ownership. |
| # The ASF licenses this file to You under the Apache License, Version 2.0 |
| # (the "License"); you may not use this file except in compliance with |
| # the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| # |
| |
| from typing import Set, List, cast |
| |
| from pywy.core import Translator |
| from pywy.operators.base import PO_T |
| from pywy.types import (GenericTco, Predicate, Function, FlatmapFunction, IterableOut, T, In, Out) |
| from pywy.operators import * |
| from pywy.core import PywyPlan |
| from pywy.core import Plugin |
| |
| |
| class WayangContext: |
| """ |
| This is the entry point for users to work with Wayang. |
| """ |
| plugins: Set[Plugin] |
| |
| def __init__(self): |
| self.plugins = set() |
| |
| """ |
| add a :class:`Plugin` to the :class:`Context` |
| """ |
| |
| def register(self, *plugins: Plugin): |
| for p in plugins: |
| self.plugins.add(p) |
| return self |
| |
| """ |
| remove a :class:`Plugin` from the :class:`Context` |
| """ |
| |
| def unregister(self, *plugins: Plugin): |
| for p in plugins: |
| self.plugins.remove(p) |
| return self |
| |
| def textfile(self, file_path: str) -> 'DataQuanta[str]': |
| return DataQuanta(self, TextFileSource(file_path)) |
| |
| def __str__(self): |
| return "Plugins: {}".format(str(self.plugins)) |
| |
| def __repr__(self): |
| return self.__str__() |
| |
| |
| class DataQuanta(GenericTco): |
| """ |
| Represents an intermediate result/data flow edge in a [[WayangPlan]]. |
| """ |
| context: WayangContext |
| |
| def __init__(self, context: WayangContext, operator: PywyOperator): |
| self.operator = operator |
| self.context = context |
| |
| def filter(self: "DataQuanta[T]", p: Predicate) -> "DataQuanta[T]": |
| return DataQuanta(self.context, self._connect(FilterOperator(p))) |
| |
| def map(self: "DataQuanta[In]", f: Function) -> "DataQuanta[Out]": |
| return DataQuanta(self.context, self._connect(MapOperator(f))) |
| |
| def flatmap(self: "DataQuanta[In]", f: FlatmapFunction) -> "DataQuanta[IterableOut]": |
| return DataQuanta(self.context, self._connect(FlatmapOperator(f))) |
| |
| def store_textfile(self: "DataQuanta[In]", path: str, end_line: str = None): |
| last: List[SinkOperator] = [ |
| cast( |
| SinkOperator, |
| self._connect( |
| TextFileSink( |
| path, |
| self.operator.outputSlot[0], |
| end_line |
| ) |
| ) |
| ) |
| ] |
| plan = PywyPlan(self.context.plugins, last) |
| |
| plug = self.context.plugins.pop() |
| trs: Translator = Translator(plug, plan) |
| new_plan = trs.translate() |
| plug.get_executor().execute(new_plan) |
| # TODO add the logic to execute the plan |
| |
| def _connect(self, op: PO_T, port_op: int = 0) -> PywyOperator: |
| self.operator.connect(0, op, port_op) |
| return op |
| |
| def __str__(self): |
| return str(self.operator) |
| |
| def __repr__(self): |
| return self.__str__() |