| // Copyright 2021 The Bazel Authors. All rights reserved. |
| // |
| // Licensed 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 com.google.devtools.build.lib.packages; |
| |
| import java.util.OptionalLong; |
| |
| /** |
| * Estimates "package overhead", which is a rough approximation of the memory and general accounting |
| * costs associated with a loaded package. |
| * |
| * <p>Estimates are not intended to be perfect but should be reproducible. Some things may be |
| * over-accounted, some things under, with the expectation that it all comes out roughly even in the |
| * end. |
| */ |
| public interface PackageOverheadEstimator { |
| |
| PackageOverheadEstimator NOOP_ESTIMATOR = pkg -> OptionalLong.empty(); |
| |
| /** Returns the estimated package overhead, or empty if not calculated. */ |
| OptionalLong estimatePackageOverhead(Package pkg); |
| } |