| /** |
| * 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. |
| */ |
| |
| package org.apache.ambari.metrics.core.timeline.aggregators; |
| |
| import java.util.List; |
| |
| /** |
| * Interface to add a custom downsampler. |
| * Each configured downsampler will be executed during an aggregation cycle. |
| */ |
| public interface CustomDownSampler { |
| |
| /** |
| * Gatekeeper to check the configs. If this fails, the downsampling is not done. |
| * @return |
| */ |
| public boolean validateConfigs(); |
| |
| /** |
| * Return the set of statements that needs to be executed for the downsampling. |
| * @param startTime |
| * @param endTime |
| * @param tableName |
| * @return |
| */ |
| public List<String> prepareDownSamplingStatement(Long startTime, Long endTime, String tableName); |
| |
| } |
