| # |
| # 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 codecs |
| import time |
| |
| |
| class ReadCallback: |
| def process(self, input_stream): |
| self.content = codecs.getreader('utf-8')(input_stream).read() |
| return len(self.content) |
| |
| |
| class WriteReverseStringCallback: |
| def __init__(self, content): |
| self.content = content |
| |
| def process(self, output_stream): |
| reversed_content = self.content[::-1] |
| output_stream.write(reversed_content.encode('utf-8')) |
| return len(reversed_content) |
| |
| |
| def onTrigger(context, session): |
| flow_file = session.get() |
| if flow_file is not None: |
| read_callback = ReadCallback() |
| session.read(flow_file, read_callback) |
| session.write(flow_file, WriteReverseStringCallback(read_callback.content)) |
| flow_file.addAttribute('python_timestamp', str(int(time.time()))) |
| session.transfer(flow_file, REL_SUCCESS) |