| // Copyright 2015 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.skyframe; |
| |
| import com.google.common.collect.ImmutableSet; |
| |
| import java.util.Collection; |
| |
| /** |
| * A utility interface for dealing with reverse deps in NodeEntry and BuildingState implementations. |
| * |
| * <p>The reason for this interface is to abstract out dealing with reverse deps, which is subject |
| * to various non-trivial and fairly ugly memory/performance optimizations. |
| * |
| * <p>This interface is public only for the benefit of alternative graph implementations outside of |
| * the package. |
| */ |
| public interface ReverseDepsUtil<T> { |
| void addReverseDeps(T container, Collection<SkyKey> reverseDeps); |
| /** |
| * Checks that the reverse dependency is not already present. Implementations may choose not to |
| * perform this check, or only to do it if reverseDeps is small, so that it does not impact |
| * performance. |
| */ |
| void maybeCheckReverseDepNotPresent(T container, SkyKey reverseDep); |
| |
| void checkReverseDep(T container, SkyKey reverseDep); |
| |
| void removeReverseDep(T container, SkyKey reverseDep); |
| |
| void consolidateReverseDeps(T container); |
| |
| ImmutableSet<SkyKey> getReverseDeps(T container); |
| |
| String toString(T container); |
| } |