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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.lib.skyframe;
import static java.util.concurrent.TimeUnit.MINUTES;
import com.google.common.base.Preconditions;
import com.google.common.base.Predicate;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import com.google.common.flogger.GoogleLogger;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.Artifact.TreeFileArtifact;
import com.google.devtools.build.lib.actions.FileArtifactValue;
import com.google.devtools.build.lib.actions.FileStateType;
import com.google.devtools.build.lib.concurrent.ExecutorUtil;
import com.google.devtools.build.lib.concurrent.Sharder;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
import com.google.devtools.build.lib.profiler.AutoProfiler;
import com.google.devtools.build.lib.profiler.AutoProfiler.ElapsedTimeReceiver;
import com.google.devtools.build.lib.profiler.Profiler;
import com.google.devtools.build.lib.profiler.SilentCloseable;
import com.google.devtools.build.lib.skyframe.SkyValueDirtinessChecker.DirtyResult;
import com.google.devtools.build.lib.skyframe.TreeArtifactValue.ArchivedRepresentation;
import com.google.devtools.build.lib.util.Pair;
import com.google.devtools.build.lib.util.io.TimestampGranularityMonitor;
import com.google.devtools.build.lib.vfs.BatchStat;
import com.google.devtools.build.lib.vfs.Dirent;
import com.google.devtools.build.lib.vfs.FileStatusWithDigest;
import com.google.devtools.build.lib.vfs.ModifiedFileSet;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.Symlinks;
import com.google.devtools.build.lib.vfs.SyscallCache;
import com.google.devtools.build.skyframe.Differencer;
import com.google.devtools.build.skyframe.Differencer.DiffWithDelta.Delta;
import com.google.devtools.build.skyframe.FunctionHermeticity;
import com.google.devtools.build.skyframe.SkyFunctionName;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import com.google.devtools.build.skyframe.WalkableGraph;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.NavigableSet;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicInteger;
import javax.annotation.Nullable;
/**
* A helper class to find dirty values by accessing the filesystem directly (contrast with
* {@link DiffAwareness}).
*/
public class FilesystemValueChecker {
private static final GoogleLogger logger = GoogleLogger.forEnclosingClass();
private static final Predicate<SkyKey> ACTION_FILTER =
SkyFunctionName.functionIs(SkyFunctions.ACTION_EXECUTION);
@Nullable private final TimestampGranularityMonitor tsgm;
private final SyscallCache syscallCache;
private final int numThreads;
public FilesystemValueChecker(
@Nullable TimestampGranularityMonitor tsgm,
SyscallCache syscallCache,
int numThreads) {
this.tsgm = tsgm;
this.syscallCache = syscallCache;
this.numThreads = numThreads;
}
/**
* Returns a {@link Differencer.DiffWithDelta} containing keys from the give map that are dirty
* according to the passed-in {@code dirtinessChecker}.
*/
// TODO(bazel-team): Refactor these methods so that FilesystemValueChecker only operates on a
// WalkableGraph.
ImmutableBatchDirtyResult getDirtyKeys(
Map<SkyKey, SkyValue> valuesMap, SkyValueDirtinessChecker dirtinessChecker)
throws InterruptedException {
return getDirtyValues(new MapBackedValueFetcher(valuesMap), valuesMap.keySet(),
dirtinessChecker, /*checkMissingValues=*/false);
}
/**
* Returns a {@link Differencer.DiffWithDelta} containing keys that are dirty according to the
* passed-in {@code dirtinessChecker}.
*/
public Differencer.DiffWithDelta getNewAndOldValues(
WalkableGraph walkableGraph,
Collection<SkyKey> keys,
SkyValueDirtinessChecker dirtinessChecker)
throws InterruptedException {
return getDirtyValues(new WalkableGraphBackedValueFetcher(walkableGraph), keys,
dirtinessChecker, /*checkMissingValues=*/true);
}
private interface ValueFetcher {
@Nullable
SkyValue get(SkyKey key) throws InterruptedException;
}
private static class WalkableGraphBackedValueFetcher implements ValueFetcher {
private final WalkableGraph walkableGraph;
private WalkableGraphBackedValueFetcher(WalkableGraph walkableGraph) {
this.walkableGraph = walkableGraph;
}
@Override
@Nullable
public SkyValue get(SkyKey key) throws InterruptedException {
return walkableGraph.getValue(key);
}
}
private static class MapBackedValueFetcher implements ValueFetcher {
private final Map<SkyKey, SkyValue> valuesMap;
private MapBackedValueFetcher(Map<SkyKey, SkyValue> valuesMap) {
this.valuesMap = valuesMap;
}
@Override
@Nullable
public SkyValue get(SkyKey key) {
return valuesMap.get(key);
}
}
/** Callback for modified output files for logging/metrics. */
@FunctionalInterface
@ThreadSafe
interface ModifiedOutputsReceiver {
/**
* Called on every modified artifact detected by {@link #getDirtyActionValues}.
*
* @param maybeModifiedTime Best effort modified time, -1 when not available/missing.
* @param artifact Modified output artifact.
*/
void reportModifiedOutputFile(long maybeModifiedTime, Artifact artifact);
}
/**
* Return a collection of action values which have output files that are not in-sync with the
* on-disk file value (were modified externally).
*/
Collection<SkyKey> getDirtyActionValues(
Map<SkyKey, SkyValue> valuesMap,
@Nullable final BatchStat batchStatter,
ModifiedFileSet modifiedOutputFiles,
boolean trustRemoteArtifacts,
ModifiedOutputsReceiver modifiedOutputsReceiver)
throws InterruptedException {
if (modifiedOutputFiles == ModifiedFileSet.NOTHING_MODIFIED) {
logger.atInfo().log("Not checking for dirty actions since nothing was modified");
return ImmutableList.of();
}
logger.atInfo().log("Accumulating dirty actions");
final int numOutputJobs = Runtime.getRuntime().availableProcessors() * 4;
final Set<SkyKey> actionSkyKeys = new HashSet<>();
try (SilentCloseable c = Profiler.instance().profile("getDirtyActionValues.filter_actions")) {
for (SkyKey key : valuesMap.keySet()) {
if (ACTION_FILTER.apply(key)) {
actionSkyKeys.add(key);
}
}
}
final Sharder<Pair<SkyKey, ActionExecutionValue>> outputShards =
new Sharder<>(numOutputJobs, actionSkyKeys.size());
for (SkyKey key : actionSkyKeys) {
outputShards.add(Pair.of(key, (ActionExecutionValue) valuesMap.get(key)));
}
logger.atInfo().log("Sharded action values for batching");
ExecutorService executor = Executors.newFixedThreadPool(
numOutputJobs,
new ThreadFactoryBuilder().setNameFormat("FileSystem Output File Invalidator %d").build());
Collection<SkyKey> dirtyKeys = Sets.newConcurrentHashSet();
final ImmutableSet<PathFragment> knownModifiedOutputFiles =
modifiedOutputFiles.treatEverythingAsModified()
? null
: modifiedOutputFiles.modifiedSourceFiles();
// Initialized lazily through a supplier because it is only used to check modified
// TreeArtifacts, which are not frequently used in builds.
Supplier<NavigableSet<PathFragment>> sortedKnownModifiedOutputFiles =
Suppliers.memoize(
new Supplier<NavigableSet<PathFragment>>() {
@Nullable
@Override
public NavigableSet<PathFragment> get() {
if (knownModifiedOutputFiles == null) {
return null;
} else {
return ImmutableSortedSet.copyOf(knownModifiedOutputFiles);
}
}
});
boolean interrupted;
try (SilentCloseable c = Profiler.instance().profile("getDirtyActionValues.stat_files")) {
for (List<Pair<SkyKey, ActionExecutionValue>> shard : outputShards) {
Runnable job =
(batchStatter == null)
? outputStatJob(
dirtyKeys,
shard,
knownModifiedOutputFiles,
sortedKnownModifiedOutputFiles,
trustRemoteArtifacts,
modifiedOutputsReceiver)
: batchStatJob(
dirtyKeys,
shard,
batchStatter,
knownModifiedOutputFiles,
sortedKnownModifiedOutputFiles,
trustRemoteArtifacts,
modifiedOutputsReceiver);
executor.execute(job);
}
interrupted = ExecutorUtil.interruptibleShutdown(executor);
}
if (dirtyKeys.isEmpty()) {
logger.atInfo().log("Completed output file stat checks, no modified outputs found");
} else {
logger.atInfo().log(
"Completed output file stat checks, %d actions' outputs changed, first few: %s",
dirtyKeys.size(), Iterables.limit(dirtyKeys, 10));
}
if (interrupted) {
throw new InterruptedException();
}
return dirtyKeys;
}
private Runnable batchStatJob(
Collection<SkyKey> dirtyKeys,
List<Pair<SkyKey, ActionExecutionValue>> shard,
BatchStat batchStatter,
ImmutableSet<PathFragment> knownModifiedOutputFiles,
Supplier<NavigableSet<PathFragment>> sortedKnownModifiedOutputFiles,
boolean trustRemoteArtifacts,
ModifiedOutputsReceiver modifiedOutputsReceiver) {
return () -> {
Map<Artifact, Pair<SkyKey, ActionExecutionValue>> fileToKeyAndValue = new HashMap<>();
Map<Artifact, Pair<SkyKey, ActionExecutionValue>> treeArtifactsToKeyAndValue =
new HashMap<>();
for (Pair<SkyKey, ActionExecutionValue> keyAndValue : shard) {
ActionExecutionValue actionValue = keyAndValue.getSecond();
if (actionValue == null) {
dirtyKeys.add(keyAndValue.getFirst());
} else {
for (Artifact artifact : actionValue.getAllFileValues().keySet()) {
if (!artifact.isMiddlemanArtifact()
&& shouldCheckFile(knownModifiedOutputFiles, artifact)) {
fileToKeyAndValue.put(artifact, keyAndValue);
}
}
for (Map.Entry<Artifact, TreeArtifactValue> entry :
actionValue.getAllTreeArtifactValues().entrySet()) {
Artifact treeArtifact = entry.getKey();
TreeArtifactValue tree = entry.getValue();
for (TreeFileArtifact child : tree.getChildren()) {
if (shouldCheckFile(knownModifiedOutputFiles, child)) {
fileToKeyAndValue.put(child, keyAndValue);
}
}
tree.getArchivedRepresentation()
.map(ArchivedRepresentation::archivedTreeFileArtifact)
.filter(
archivedTreeArtifact ->
shouldCheckFile(knownModifiedOutputFiles, archivedTreeArtifact))
.ifPresent(
archivedTreeArtifact ->
fileToKeyAndValue.put(archivedTreeArtifact, keyAndValue));
if (shouldCheckTreeArtifact(sortedKnownModifiedOutputFiles.get(), treeArtifact)) {
treeArtifactsToKeyAndValue.put(treeArtifact, keyAndValue);
}
}
}
}
List<Artifact> artifacts = ImmutableList.copyOf(fileToKeyAndValue.keySet());
List<FileStatusWithDigest> stats;
try {
stats =
batchStatter.batchStat(
/*includeDigest=*/ true,
/*includeLinks=*/ true,
Artifact.asPathFragments(artifacts));
} catch (IOException e) {
logger.atWarning().withCause(e).log(
"Unable to process batch stat, falling back to individual stats");
outputStatJob(
dirtyKeys,
shard,
knownModifiedOutputFiles,
sortedKnownModifiedOutputFiles,
trustRemoteArtifacts,
modifiedOutputsReceiver)
.run();
return;
} catch (InterruptedException e) {
logger.atInfo().log("Interrupted doing batch stat");
// We handle interrupt in the main thread.
return;
}
Preconditions.checkState(
artifacts.size() == stats.size(),
"artifacts.size() == %s stats.size() == %s",
artifacts.size(),
stats.size());
for (int i = 0; i < artifacts.size(); i++) {
Artifact artifact = artifacts.get(i);
FileStatusWithDigest stat = stats.get(i);
Pair<SkyKey, ActionExecutionValue> keyAndValue = fileToKeyAndValue.get(artifact);
ActionExecutionValue actionValue = keyAndValue.getSecond();
SkyKey key = keyAndValue.getFirst();
FileArtifactValue lastKnownData = actionValue.getExistingFileArtifactValue(artifact);
try {
FileArtifactValue newData =
ActionMetadataHandler.fileArtifactValueFromArtifact(
artifact, stat, syscallCache, tsgm);
if (newData.couldBeModifiedSince(lastKnownData)) {
modifiedOutputsReceiver.reportModifiedOutputFile(
stat != null ? stat.getLastChangeTime() : -1, artifact);
dirtyKeys.add(key);
}
} catch (IOException e) {
logger.atWarning().withCause(e).log(
"Error for %s (%s %s %s)", artifact, stat, keyAndValue, lastKnownData);
// This is an unexpected failure getting a digest or symlink target.
modifiedOutputsReceiver.reportModifiedOutputFile(-1, artifact);
dirtyKeys.add(key);
}
}
// Unfortunately, there exists no facility to batch list directories.
// We must use direct filesystem calls.
for (Map.Entry<Artifact, Pair<SkyKey, ActionExecutionValue>> entry :
treeArtifactsToKeyAndValue.entrySet()) {
Artifact artifact = entry.getKey();
if (treeArtifactIsDirty(
entry.getKey(), entry.getValue().getSecond().getTreeArtifactValue(artifact))) {
// Count the changed directory as one "file".
// TODO(bazel-team): There are no tests for this codepath.
modifiedOutputsReceiver.reportModifiedOutputFile(
getBestEffortModifiedTime(artifact.getPath()), artifact);
dirtyKeys.add(entry.getValue().getFirst());
}
}
};
}
private Runnable outputStatJob(
Collection<SkyKey> dirtyKeys,
List<Pair<SkyKey, ActionExecutionValue>> shard,
ImmutableSet<PathFragment> knownModifiedOutputFiles,
Supplier<NavigableSet<PathFragment>> sortedKnownModifiedOutputFiles,
boolean trustRemoteArtifacts,
ModifiedOutputsReceiver modifiedOutputsReceiver) {
return new Runnable() {
@Override
public void run() {
for (Pair<SkyKey, ActionExecutionValue> keyAndValue : shard) {
ActionExecutionValue value = keyAndValue.getSecond();
if (value == null
|| actionValueIsDirtyWithDirectSystemCalls(
value,
knownModifiedOutputFiles,
sortedKnownModifiedOutputFiles,
trustRemoteArtifacts,
modifiedOutputsReceiver)) {
dirtyKeys.add(keyAndValue.getFirst());
}
}
}
};
}
private boolean treeArtifactIsDirty(Artifact artifact, TreeArtifactValue value) {
Path path = artifact.getPath();
if (path.isSymbolicLink()) {
return true; // TreeArtifacts may not be symbolic links.
}
// This could be improved by short-circuiting as soon as we see a child that is not present in
// the TreeArtifactValue, but it doesn't seem to be a major source of overhead.
Set<PathFragment> currentChildren = new HashSet<>();
try {
TreeArtifactValue.visitTree(
path,
(child, type) -> {
if (type != Dirent.Type.DIRECTORY) {
currentChildren.add(child);
}
});
} catch (IOException e) {
return true;
}
return !(currentChildren.isEmpty() && value.isEntirelyRemote())
&& !currentChildren.equals(value.getChildPaths());
}
private boolean artifactIsDirtyWithDirectSystemCalls(
ImmutableSet<PathFragment> knownModifiedOutputFiles,
boolean trustRemoteArtifacts,
Map.Entry<? extends Artifact, FileArtifactValue> entry,
ModifiedOutputsReceiver modifiedOutputsReceiver) {
Artifact file = entry.getKey();
FileArtifactValue lastKnownData = entry.getValue();
if (file.isMiddlemanArtifact() || !shouldCheckFile(knownModifiedOutputFiles, file)) {
return false;
}
try {
FileArtifactValue fileMetadata =
ActionMetadataHandler.fileArtifactValueFromArtifact(file, null, syscallCache, tsgm);
boolean trustRemoteValue =
fileMetadata.getType() == FileStateType.NONEXISTENT
&& lastKnownData.isRemote()
&& trustRemoteArtifacts;
if (!trustRemoteValue && fileMetadata.couldBeModifiedSince(lastKnownData)) {
modifiedOutputsReceiver.reportModifiedOutputFile(
fileMetadata.getType() != FileStateType.NONEXISTENT
? file.getPath().getLastModifiedTime(Symlinks.FOLLOW)
: -1,
file);
return true;
}
return false;
} catch (IOException e) {
// This is an unexpected failure getting a digest or symlink target.
modifiedOutputsReceiver.reportModifiedOutputFile(/*maybeModifiedTime=*/ -1, file);
return true;
}
}
private boolean actionValueIsDirtyWithDirectSystemCalls(
ActionExecutionValue actionValue,
ImmutableSet<PathFragment> knownModifiedOutputFiles,
Supplier<NavigableSet<PathFragment>> sortedKnownModifiedOutputFiles,
boolean trustRemoteArtifacts,
ModifiedOutputsReceiver modifiedOutputsReceiver) {
boolean isDirty = false;
for (Map.Entry<Artifact, FileArtifactValue> entry : actionValue.getAllFileValues().entrySet()) {
if (artifactIsDirtyWithDirectSystemCalls(
knownModifiedOutputFiles, trustRemoteArtifacts, entry, modifiedOutputsReceiver)) {
isDirty = true;
}
}
for (Map.Entry<Artifact, TreeArtifactValue> entry :
actionValue.getAllTreeArtifactValues().entrySet()) {
TreeArtifactValue tree = entry.getValue();
if (!tree.isEntirelyRemote()) {
for (Map.Entry<TreeFileArtifact, FileArtifactValue> childEntry :
tree.getChildValues().entrySet()) {
if (artifactIsDirtyWithDirectSystemCalls(
knownModifiedOutputFiles,
trustRemoteArtifacts,
childEntry,
modifiedOutputsReceiver)) {
isDirty = true;
}
}
isDirty =
isDirty
|| tree.getArchivedRepresentation()
.map(
archivedRepresentation ->
artifactIsDirtyWithDirectSystemCalls(
knownModifiedOutputFiles,
trustRemoteArtifacts,
Maps.immutableEntry(
archivedRepresentation.archivedTreeFileArtifact(),
archivedRepresentation.archivedFileValue()),
modifiedOutputsReceiver))
.orElse(false);
}
Artifact treeArtifact = entry.getKey();
if (shouldCheckTreeArtifact(sortedKnownModifiedOutputFiles.get(), treeArtifact)
&& treeArtifactIsDirty(treeArtifact, entry.getValue())) {
// Count the changed directory as one "file".
modifiedOutputsReceiver.reportModifiedOutputFile(
getBestEffortModifiedTime(treeArtifact.getPath()), treeArtifact);
isDirty = true;
}
}
return isDirty;
}
private static long getBestEffortModifiedTime(Path path) {
try {
return path.exists() ? path.getLastModifiedTime() : -1;
} catch (IOException e) {
logger.atWarning().atMostEvery(1, MINUTES).withCause(e).log(
"Failed to get modified time for output at: %s", path);
return -1;
}
}
private static boolean shouldCheckFile(ImmutableSet<PathFragment> knownModifiedOutputFiles,
Artifact artifact) {
return knownModifiedOutputFiles == null
|| knownModifiedOutputFiles.contains(artifact.getExecPath());
}
private static boolean shouldCheckTreeArtifact(
@Nullable NavigableSet<PathFragment> knownModifiedOutputFiles, Artifact treeArtifact) {
// If null, everything needs to be checked.
if (knownModifiedOutputFiles == null) {
return true;
}
// Here we do the following to see whether a TreeArtifact is modified:
// 1. Sort the set of modified file paths in lexicographical order using TreeSet.
// 2. Get the first modified output file path that is greater than or equal to the exec path of
// the TreeArtifact to check.
// 3. Check whether the returned file path contains the exec path of the TreeArtifact as a
// prefix path.
PathFragment artifactExecPath = treeArtifact.getExecPath();
PathFragment headPath = knownModifiedOutputFiles.ceiling(artifactExecPath);
return headPath != null && headPath.startsWith(artifactExecPath);
}
private ImmutableBatchDirtyResult getDirtyValues(
ValueFetcher fetcher,
Collection<SkyKey> keys,
final SkyValueDirtinessChecker checker,
final boolean checkMissingValues)
throws InterruptedException {
ExecutorService executor =
Executors.newFixedThreadPool(
numThreads,
new ThreadFactoryBuilder().setNameFormat("FileSystem Value Invalidator %d").build());
final AtomicInteger numKeysChecked = new AtomicInteger(0);
MutableBatchDirtyResult batchResult = new MutableBatchDirtyResult(numKeysChecked);
ElapsedTimeReceiver elapsedTimeReceiver =
elapsedTimeNanos -> {
if (elapsedTimeNanos > 0) {
logger.atInfo().log(
"Spent %d nanoseconds checking %d filesystem nodes (%d scanned)",
elapsedTimeNanos, numKeysChecked.get(), keys.size());
}
};
try (AutoProfiler prof = AutoProfiler.create(elapsedTimeReceiver)) {
for (final SkyKey key : keys) {
if (!checker.applies(key)) {
continue;
}
Preconditions.checkState(
key.functionName().getHermeticity() == FunctionHermeticity.NONHERMETIC,
"Only non-hermetic keys can be dirty roots: %s",
key);
executor.execute(
() -> {
SkyValue value;
try {
value = fetcher.get(key);
} catch (InterruptedException e) {
// Exit fast. Interrupt is handled below on the main thread.
return;
}
if (!checkMissingValues && value == null) {
return;
}
numKeysChecked.incrementAndGet();
DirtyResult result = checker.check(key, value, syscallCache, tsgm);
if (result.isDirty()) {
batchResult.add(key, value, result.getNewValue());
}
});
}
// If a Runnable above crashes, this shutdown can still succeed but the whole server will come
// down shortly.
if (ExecutorUtil.interruptibleShutdown(executor)) {
throw new InterruptedException();
}
}
return batchResult.toImmutable();
}
static class ImmutableBatchDirtyResult implements Differencer.DiffWithDelta {
private final Collection<SkyKey> dirtyKeysWithoutNewValues;
private final Map<SkyKey, Delta> dirtyKeysWithNewAndOldValues;
private final int numKeysChecked;
private ImmutableBatchDirtyResult(
Collection<SkyKey> dirtyKeysWithoutNewValues,
Map<SkyKey, Delta> dirtyKeysWithNewAndOldValues,
int numKeysChecked) {
this.dirtyKeysWithoutNewValues = dirtyKeysWithoutNewValues;
this.dirtyKeysWithNewAndOldValues = dirtyKeysWithNewAndOldValues;
this.numKeysChecked = numKeysChecked;
}
@Override
public Collection<SkyKey> changedKeysWithoutNewValues() {
return dirtyKeysWithoutNewValues;
}
@Override
public Map<SkyKey, SkyValue> changedKeysWithNewValues() {
return Delta.newValues(dirtyKeysWithNewAndOldValues);
}
int getNumKeysChecked() {
return numKeysChecked;
}
}
/**
* Result of a batch call to {@link SkyValueDirtinessChecker#check}. Partitions the dirty values
* based on whether we have a new value available for them or not.
*/
private static class MutableBatchDirtyResult {
private final Set<SkyKey> concurrentDirtyKeysWithoutNewValues =
Collections.newSetFromMap(new ConcurrentHashMap<SkyKey, Boolean>());
private final ConcurrentHashMap<SkyKey, Delta> concurrentDirtyKeysWithNewAndOldValues =
new ConcurrentHashMap<>();
private final AtomicInteger numChecked;
private MutableBatchDirtyResult(AtomicInteger numChecked) {
this.numChecked = numChecked;
}
private void add(SkyKey key, @Nullable SkyValue oldValue, @Nullable SkyValue newValue) {
if (newValue == null) {
concurrentDirtyKeysWithoutNewValues.add(key);
} else {
if (oldValue == null) {
concurrentDirtyKeysWithNewAndOldValues.put(key, Delta.create(newValue));
} else {
concurrentDirtyKeysWithNewAndOldValues.put(key, Delta.create(oldValue, newValue));
}
}
}
private ImmutableBatchDirtyResult toImmutable() {
return new ImmutableBatchDirtyResult(
concurrentDirtyKeysWithoutNewValues,
concurrentDirtyKeysWithNewAndOldValues,
numChecked.get());
}
}
}