| # |
| # 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. |
| # |
| |
| import pickle |
| import cloudpickle |
| from config.config_reader import get_source_types |
| from config.config_reader import get_sink_types |
| from config.config_reader import get_boundary_types |
| import logging |
| |
| pickle_protocol = pickle.HIGHEST_PROTOCOL |
| |
| |
| # Describes an Operation over an intermediate result |
| # Each operation could be processed by Python or Java platforms |
| class Operator: |
| |
| def __init__( |
| self, operator_type=None, udf=None, previous=None, |
| iterator=None, python_exec=False |
| ): |
| |
| # Operator ID |
| self.id = id(self) |
| |
| # Operator Type |
| self.operator_type = operator_type |
| |
| # Set Boundaries |
| if self.operator_type in get_boundary_types(): |
| self.boundary = True |
| else: |
| self.boundary = False |
| |
| # UDF Function |
| self.udf = udf |
| |
| # Source types must come with an Iterator |
| self.iterator = iterator |
| if operator_type in get_source_types(): |
| if iterator is None: |
| print("Source Operator Type without an Iterator") |
| raise |
| else: |
| self.source = True |
| else: |
| self.source = False |
| |
| # Sink Operators |
| if operator_type in get_sink_types(): |
| self.sink = True |
| else: |
| self.sink = False |
| |
| # TODO Why managing previous and predecessors per separate? |
| self.previous = previous |
| |
| self.successor = [] |
| self.predecessor = [] |
| |
| self.parameters = {} |
| |
| # Set predecessors and successors from previous |
| if self.previous: |
| for prev in self.previous: |
| if prev is not None: |
| prev.set_successor(self) |
| self.set_predecessor(prev) |
| |
| self.python_exec = python_exec |
| |
| logging.info("Operator:" + str(self.getID()) + ", type:" + self.operator_type + ", PythonExecutable: " + |
| str(self.python_exec) + |
| ", is boundary: " + str(self.is_boundary()) + ", is source: " + |
| str(self.source) + ", is sink: " + str(self.sink)) |
| |
| def getID(self): |
| return self.id |
| |
| def is_source(self): |
| return self.source |
| |
| def is_sink(self): |
| return self.sink |
| |
| def is_boundary(self): |
| return self.boundary |
| |
| def serialize_udf(self): |
| self.udf = cloudpickle.dumps(self.udf) |
| |
| def getIterator(self): |
| if self.is_source(): |
| return self.iterator |
| # TODO this should iterate through previous REDESIGN |
| return self.udf(self.previous[0].getIterator()) |
| |
| def set_parameter(self, key, value): |
| self.parameters[key] = value |
| |
| def set_successor(self, suc): |
| if (not self.is_sink()) and self.successor.count(suc) == 0: |
| self.successor.append(suc) |
| |
| def set_predecessor(self, suc): |
| if self.predecessor.count(suc) == 0: |
| self.predecessor.append(suc) |