| #!/usr/bin/env python3 |
| # -*- encoding: utf-8 -*- |
| |
| # 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. |
| |
| """Word count bolt""" |
| |
| from ...core import BatchBolt |
| |
| class WordCountBolt(BatchBolt): |
| """Word Count Bolt counts the number of different words received and emits that number""" |
| outputs = ['count'] |
| |
| # pylint: disable=unused-argument |
| def initialize(self, config, context): |
| self.cache = {} |
| |
| def process(self, tup): |
| word = tup.values[0] |
| |
| if word in self.cache: |
| self.cache[word] += 1 |
| else: |
| self.cache[word] = 1 |
| |
| self.logger.info("Counter: %s" % str(self.cache)) |
| |
| def finish_batch(self): |
| self.logger.info("In finish batch, emitting: %d" % len(self.cache)) |
| self.emit([len(self.cache)]) |