blob: babf90208c7e16ef69bb3c4b84b593126f562c1f [file] [log] [blame]
// 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.skyframe;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
/**
* A value that represents "error transience", i.e. anything which may have caused an unexpected
* failure. Is not equal to anything, including itself, in order to force re-evaluation.
*/
public final class ErrorTransienceValue implements SkyValue {
public static final SkyFunctionName FUNCTION_NAME = SkyFunctionName.create("ERROR_TRANSIENCE");
@AutoCodec public static final SkyKey KEY = () -> FUNCTION_NAME;
@AutoCodec public static final ErrorTransienceValue INSTANCE = new ErrorTransienceValue();
private ErrorTransienceValue() {}
@Override
public int hashCode() {
// Not the prettiest, but since we always return false for equals throw exception here to
// catch any errors related to hash-based collections quickly.
throw new UnsupportedOperationException();
}
@Override
public boolean equals(Object other) {
return false;
}
@Override
public String toString() {
return "ErrorTransienceValue";
}
@SuppressWarnings("unused")
private void writeObject(ObjectOutputStream unused) {
throw new UnsupportedOperationException("Java serialization not supported");
}
@SuppressWarnings("unused")
private void readObject(ObjectInputStream unused) {
throw new UnsupportedOperationException("Java serialization not supported");
}
}