| // Copyright 2020 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.collect.nestedset; |
| |
| import com.google.common.collect.ImmutableList; |
| import java.util.concurrent.TimeoutException; |
| |
| /** |
| * Helper class to expand {@link NestedSet} instances. |
| * |
| * <p>Implementations besides {@link #DEFAULT} may wish to implement callbacks or timeouts for |
| * dealing with expansions of sets from storage. |
| */ |
| public interface NestedSetExpander { |
| |
| <T> ImmutableList<? extends T> toListInterruptibly(NestedSet<? extends T> nestedSet) |
| throws InterruptedException, TimeoutException; |
| |
| /** Simply delegates to {@link NestedSet#toListInterruptibly} without doing anything special. */ |
| NestedSetExpander DEFAULT = NestedSet::toListInterruptibly; |
| } |