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// Copyright 2016 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.Iterables;
import com.google.common.collect.Maps;
import com.google.devtools.build.lib.events.ExtendedEventHandler;
import com.google.devtools.build.lib.util.Preconditions;
import com.google.devtools.build.skyframe.QueryableGraph.Reason;
import java.util.Map;
/**
* A {@link SkyFunction.Environment} backed by a {@link QueryableGraph}. For use when a single
* SkyFunction needs recomputation, and its dependencies do not need to be evaluated. Any missing
* dependencies will be ignored.
*/
public class QueryableGraphBackedSkyFunctionEnvironment extends AbstractSkyFunctionEnvironment {
private final QueryableGraph queryableGraph;
private final ExtendedEventHandler eventHandler;
public QueryableGraphBackedSkyFunctionEnvironment(
QueryableGraph queryableGraph, ExtendedEventHandler eventHandler) {
this.queryableGraph = queryableGraph;
this.eventHandler = eventHandler;
}
private static ValueOrUntypedException toUntypedValue(NodeEntry nodeEntry)
throws InterruptedException {
if (nodeEntry == null || !nodeEntry.isDone()) {
return ValueOrExceptionUtils.ofNull();
}
SkyValue maybeWrappedValue = nodeEntry.getValueMaybeWithMetadata();
SkyValue justValue = ValueWithMetadata.justValue(maybeWrappedValue);
if (justValue != null) {
return ValueOrExceptionUtils.ofValueUntyped(justValue);
}
ErrorInfo errorInfo =
Preconditions.checkNotNull(ValueWithMetadata.getMaybeErrorInfo(maybeWrappedValue));
Exception exception = errorInfo.getException();
if (exception != null) {
// Give SkyFunction#compute a chance to handle this exception.
return ValueOrExceptionUtils.ofExn(exception);
}
// In a cycle.
Preconditions.checkState(
!Iterables.isEmpty(errorInfo.getCycleInfo()), "%s %s", errorInfo, maybeWrappedValue);
return ValueOrExceptionUtils.ofNull();
}
@Override
protected Map<SkyKey, ValueOrUntypedException> getValueOrUntypedExceptions(
Iterable<SkyKey> depKeys) throws InterruptedException {
Map<SkyKey, ? extends NodeEntry> resultMap =
queryableGraph.getBatch(null, Reason.DEP_REQUESTED, depKeys);
// resultMap will be smaller than what we actually return if some of depKeys were not found in
// the graph. Pad to a minimum of 16 to avoid excessive resizing.
Map<SkyKey, ValueOrUntypedException> result =
Maps.newHashMapWithExpectedSize(Math.max(16, resultMap.size()));
for (SkyKey dep : depKeys) {
result.put(dep, toUntypedValue(resultMap.get(dep)));
}
return result;
}
@Override
public ExtendedEventHandler getListener() {
return eventHandler;
}
@Override
public boolean inErrorBubblingForTesting() {
return false;
}
}
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