| // Copyright 2014 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.skyframe; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.devtools.build.lib.actions.ActionInput; |
| import com.google.devtools.build.lib.actions.ActionInputFileCache; |
| import com.google.devtools.build.lib.actions.Artifact; |
| import com.google.devtools.build.lib.actions.cache.Metadata; |
| import javax.annotation.Nullable; |
| |
| /** |
| * Cache provided by an {@link ActionExecutionFunction}, allowing Blaze to obtain artifact metadata |
| * from the graph. |
| * |
| * <p>Data for the action's inputs is injected into this cache on construction, using the graph as |
| * the source of truth. |
| */ |
| class PerActionFileCache implements ActionInputFileCache { |
| private final InputArtifactData inputArtifactData; |
| private final boolean missingArtifactsAllowed; |
| |
| /** |
| * @param inputArtifactData Map from artifact to metadata, used to return metadata upon request. |
| * @param missingArtifactsAllowed whether to tolerate missing artifacts: can happen during input |
| * discovery. |
| */ |
| PerActionFileCache(InputArtifactData inputArtifactData, boolean missingArtifactsAllowed) { |
| this.inputArtifactData = Preconditions.checkNotNull(inputArtifactData); |
| this.missingArtifactsAllowed = missingArtifactsAllowed; |
| } |
| |
| @Nullable |
| @Override |
| public Metadata getMetadata(ActionInput input) { |
| if (!(input instanceof Artifact)) { |
| return null; |
| } |
| Metadata result = inputArtifactData.get(input); |
| Preconditions.checkState(missingArtifactsAllowed || result != null, "null for %s", input); |
| return result; |
| } |
| } |