| /* |
| * 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.wayang.core.optimizer.costs; |
| |
| /** |
| * Converts a {@link LoadEstimate} into a time estimate. |
| */ |
| public abstract class LoadToTimeConverter { |
| |
| public abstract TimeEstimate convert(LoadEstimate loadEstimate); |
| |
| /** |
| * Create linear converter. |
| * |
| * @param millisPerUnit coefficient: number of milliseconds per resource usage unit |
| * @return the new instance |
| */ |
| public static LoadToTimeConverter createLinearCoverter(final double millisPerUnit) { |
| return new LoadToTimeConverter() { |
| @Override |
| public TimeEstimate convert(LoadEstimate loadEstimate) { |
| return new TimeEstimate( |
| (long) Math.ceil(millisPerUnit * loadEstimate.getLowerEstimate()), |
| (long) Math.ceil(millisPerUnit * loadEstimate.getUpperEstimate()), |
| loadEstimate.getCorrectnessProbability() |
| ); |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("LoadToTimeConverter[%,.2f units/ms]", 1d / millisPerUnit); |
| } |
| }; |
| } |
| |
| } |