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// Copyright 2018 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 javax.annotation.Nullable;
/**
* A receiver that can be informed of inconsistencies detected in Skyframe. Such inconsistencies are
* usually the result of external data loss (such as nodes in the graph, or the results of external
* computations stored in a remote execution service).
*
* <p>The receiver can tolerate such inconsistencies, or throw hard if they are unexpected.
*/
public interface GraphInconsistencyReceiver {
void noteInconsistencyAndMaybeThrow(
SkyKey key, @Nullable SkyKey otherKey, Inconsistency inconsistency);
/** The type of inconsistency detected. */
enum Inconsistency {
RESET_REQUESTED,
CHILD_MISSING_FOR_DIRTY_NODE,
CHILD_FORCED_REEVALUATION_BY_PARENT,
CHILD_UNDONE_FOR_BUILDING_NODE
}
/** A {@link GraphInconsistencyReceiver} that crashes on any inconsistency. */
GraphInconsistencyReceiver THROWING =
(key, otherKey, inconsistency) -> {
throw new IllegalStateException(
"Unexpected inconsistency: " + key + ", " + otherKey + ", " + inconsistency);
};
}
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