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// 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.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.collect.nestedset.Order;
import com.google.devtools.build.skyframe.SkyFunctionException.ReifiedSkyFunctionException;
import java.io.IOException;
import java.io.Serializable;
import java.util.Collection;
import javax.annotation.Nullable;
/**
* Information about why a {@link SkyValue} failed to evaluate successfully.
*
* <p>This is intended only for use in alternative {@code MemoizingEvaluator} implementations.
*/
public class ErrorInfo implements Serializable {
/** The set of descendants of this value that failed to build. */
// Non-final only to allow for serialization.
private transient NestedSet<SkyKey> rootCauses;
/**
* An exception thrown upon a value's failure to build. The exception is used for reporting, and
* thus may ultimately be rethrown by the caller. As well, during a --nokeep_going evaluation, if
* an error value is encountered from an earlier --keep_going build, the exception to be thrown is
* taken from here.
*/
@Nullable private final Exception exception;
private final SkyKey rootCauseOfException;
private final Iterable<CycleInfo> cycles;
private final boolean isTransient;
private final boolean isCatastrophic;
public ErrorInfo(ReifiedSkyFunctionException builderException) {
this.rootCauseOfException = builderException.getRootCauseSkyKey();
this.rootCauses = NestedSetBuilder.create(Order.STABLE_ORDER, rootCauseOfException);
this.exception = Preconditions.checkNotNull(builderException.getCause(), builderException);
this.cycles = ImmutableList.of();
this.isTransient = builderException.isTransient();
this.isCatastrophic = builderException.isCatastrophic();
}
ErrorInfo(CycleInfo cycleInfo) {
this.rootCauses = NestedSetBuilder.emptySet(Order.STABLE_ORDER);
this.exception = null;
this.rootCauseOfException = null;
this.cycles = ImmutableList.of(cycleInfo);
this.isTransient = false;
this.isCatastrophic = false;
}
public ErrorInfo(SkyKey currentValue, Collection<ErrorInfo> childErrors) {
Preconditions.checkNotNull(currentValue);
Preconditions.checkState(!childErrors.isEmpty(),
"Error value %s with no exception must depend on another error value", currentValue);
NestedSetBuilder<SkyKey> builder = NestedSetBuilder.stableOrder();
ImmutableList.Builder<CycleInfo> cycleBuilder = ImmutableList.builder();
Exception firstException = null;
SkyKey firstChildKey = null;
boolean isCatastrophic = false;
// Arbitrarily pick the first error.
for (ErrorInfo child : childErrors) {
if (firstException == null) {
firstException = child.getException();
firstChildKey = child.getRootCauseOfException();
}
builder.addTransitive(child.rootCauses);
cycleBuilder.addAll(CycleInfo.prepareCycles(currentValue, child.cycles));
isCatastrophic |= child.isCatastrophic();
}
this.rootCauses = builder.build();
this.exception = firstException;
this.rootCauseOfException = firstChildKey;
this.cycles = cycleBuilder.build();
// Parent errors should not be transient -- we depend on the child's transience, if any, to
// force re-evaluation if necessary.
this.isTransient = false;
this.isCatastrophic = isCatastrophic;
}
@Override
public String toString() {
return String.format("<ErrorInfo exception=%s rootCauses=%s cycles=%s>",
exception, rootCauses, cycles);
}
/**
* The root causes of a value that failed to build are its descendant values that failed to build.
* If a value's descendants all built successfully, but it failed to, its root cause will be
* itself. If a value depends on a cycle, but has no other errors, this method will return
* the empty set.
*/
public Iterable<SkyKey> getRootCauses() {
return rootCauses;
}
/**
* The exception thrown when building a value. May be null if value's only error is depending
* on a cycle.
*/
@Nullable public Exception getException() {
return exception;
}
public SkyKey getRootCauseOfException() {
return rootCauseOfException;
}
/**
* Any cycles found when building this value.
*
* <p>If there are a large number of cycles, only a limited number are returned here.
*
* <p>If this value has a child through which there are multiple paths to the same cycle, only one
* path is returned here. However, if there are multiple paths to the same cycle, each of which
* goes through a different child, each of them is returned here.
*/
public Iterable<CycleInfo> getCycleInfo() {
return cycles;
}
/**
* Returns true iff the error is transient, i.e. if retrying the same computation could lead to a
* different result.
*/
public boolean isTransient() {
return isTransient;
}
/**
* Returns true iff the error is catastrophic, i.e. it should halt even for a keepGoing update()
* call.
*/
public boolean isCatastrophic() {
return isCatastrophic;
}
private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException {
in.defaultReadObject();
rootCauses = NestedSetBuilder.emptySet(Order.STABLE_ORDER);
}
}
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