| /* |
| * 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; |
| |
| import java.util.Collection; |
| import java.util.LinkedList; |
| import java.util.function.Function; |
| |
| /** |
| * {@link LoadProfileEstimator} that estimates a predefined {@link LoadProfile}. |
| */ |
| public class ConstantLoadProfileEstimator implements LoadProfileEstimator { |
| |
| /** |
| * The constant {@link LoadProfile} to estimate. |
| */ |
| private final LoadProfile loadProfile; |
| |
| /** |
| * Nested {@link LoadProfileEstimator}s together with a {@link Function} to extract the estimated |
| * {@code Artifact} from the {@code Artifact}s subject to this instance. |
| */ |
| private Collection<LoadProfileEstimator> nestedEstimators = new LinkedList<>(); |
| |
| public ConstantLoadProfileEstimator(LoadProfile loadProfile) { |
| this.loadProfile = loadProfile; |
| } |
| |
| @Override |
| public void nest(LoadProfileEstimator nestedEstimator) { |
| this.nestedEstimators.add(nestedEstimator); |
| } |
| |
| @Override |
| public LoadProfile estimate(EstimationContext context) { |
| return this.loadProfile; |
| } |
| |
| @Override |
| public Collection<LoadProfileEstimator> getNestedEstimators() { |
| return this.nestedEstimators; |
| } |
| |
| @Override |
| public String getConfigurationKey() { |
| return null; |
| } |
| |
| @Override |
| public LoadProfileEstimator copy() { |
| // No copying required. |
| return this; |
| } |
| } |