| # 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 nifiapi.flowfiletransform import FlowFileTransform, FlowFileTransformResult |
| |
| |
| class RotatingForwarder(FlowFileTransform): |
| """ |
| Forwards flow files to a different relationship each time it is called in a round robin manner. |
| """ |
| def __init__(self, **kwargs): |
| self.relationship_index = 0 |
| self.relationships = ["first", "second", "third", "fourth"] |
| |
| def transform(self, context, flowFile): |
| content = flowFile.getContentsAsBytes().decode() |
| |
| relationship = self.relationships[self.relationship_index % len(self.relationships)] |
| self.relationship_index += 1 |
| self.relationship_index %= len(self.relationships) |
| return FlowFileTransformResult(relationship, contents=content) |
