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// Copyright 2015 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 static com.google.devtools.build.lib.skyframe.SkyFunctions.DIRECTORY_LISTING_STATE;
import static com.google.devtools.build.lib.skyframe.SkyFunctions.FILE_STATE;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.util.io.TimestampGranularityMonitor;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.RootedPath;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.io.IOException;
import java.util.Set;
import javax.annotation.Nullable;
/** Utilities for checking dirtiness of keys (mainly filesystem keys) in the graph. */
class DirtinessCheckerUtils {
private DirtinessCheckerUtils() {}
static class FileDirtinessChecker extends SkyValueDirtinessChecker {
private boolean applies(SkyKey skyKey) {
return skyKey.functionName().equals(FILE_STATE);
}
@Override
@Nullable
public Optional<SkyValue> maybeCreateNewValue(SkyKey key, TimestampGranularityMonitor tsgm) {
if (!applies(key)) {
return null;
}
RootedPath rootedPath = (RootedPath) key.argument();
try {
return Optional.<SkyValue>of(FileStateValue.create(rootedPath, tsgm));
} catch (InconsistentFilesystemException | IOException e) {
// TODO(bazel-team): An IOException indicates a failure to get a file digest or a symlink
// target, not a missing file. Such a failure really shouldn't happen, so failing early
// may be better here.
return Optional.<SkyValue>absent();
}
}
}
static class DirectoryDirtinessChecker extends SkyValueDirtinessChecker {
private boolean applies(SkyKey skyKey) {
return skyKey.functionName().equals(DIRECTORY_LISTING_STATE);
}
@Override
@Nullable
public Optional<SkyValue> maybeCreateNewValue(SkyKey key, TimestampGranularityMonitor tsgm) {
if (!applies(key)) {
return null;
}
RootedPath rootedPath = (RootedPath) key.argument();
try {
return Optional.<SkyValue>of(DirectoryListingStateValue.create(rootedPath));
} catch (IOException e) {
return Optional.<SkyValue>absent();
}
}
}
static class BasicFilesystemDirtinessChecker extends SkyValueDirtinessChecker {
private final FileDirtinessChecker fdc = new FileDirtinessChecker();
private final DirectoryDirtinessChecker ddc = new DirectoryDirtinessChecker();
private final UnionDirtinessChecker checker =
new UnionDirtinessChecker(ImmutableList.of(fdc, ddc));
protected boolean applies(SkyKey skyKey) {
return fdc.applies(skyKey) || ddc.applies(skyKey);
}
@Override
@Nullable
public Optional<SkyValue> maybeCreateNewValue(SkyKey key, TimestampGranularityMonitor tsgm) {
return checker.maybeCreateNewValue(key, tsgm);
}
}
static final class MissingDiffDirtinessChecker extends BasicFilesystemDirtinessChecker {
private final Set<Path> missingDiffPaths;
MissingDiffDirtinessChecker(final Set<Path> missingDiffPaths) {
this.missingDiffPaths = missingDiffPaths;
}
@Override
@Nullable
public DirtyResult maybeCheck(SkyKey key, @Nullable SkyValue oldValue,
TimestampGranularityMonitor tsgm) {
return applies(key) && missingDiffPaths.contains(((RootedPath) key.argument()).getRoot())
? super.maybeCheck(key, oldValue, tsgm)
: null;
}
}
/** {@link SkyValueDirtinessChecker} that encompasses a union of other dirtiness checkers. */
static final class UnionDirtinessChecker extends SkyValueDirtinessChecker {
private final Iterable<SkyValueDirtinessChecker> dirtinessCheckers;
UnionDirtinessChecker(Iterable<SkyValueDirtinessChecker> dirtinessCheckers) {
this.dirtinessCheckers = dirtinessCheckers;
}
@Override
@Nullable
public Optional<SkyValue> maybeCreateNewValue(SkyKey key, TimestampGranularityMonitor tsgm) {
for (SkyValueDirtinessChecker dirtinessChecker : dirtinessCheckers) {
Optional<SkyValue> newValueMaybe = dirtinessChecker.maybeCreateNewValue(key, tsgm);
if (newValueMaybe != null) {
return newValueMaybe;
}
}
return null;
}
@Override
@Nullable
public DirtyResult maybeCheck(SkyKey key, @Nullable SkyValue oldValue,
TimestampGranularityMonitor tsgm) {
for (SkyValueDirtinessChecker dirtinessChecker : dirtinessCheckers) {
DirtyResult dirtyResult = dirtinessChecker.maybeCheck(key, oldValue, tsgm);
if (dirtyResult != null) {
return dirtyResult;
}
}
return null;
}
}
}
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