blob: be14b84e39b05d6a5406117a88d861d3a85479e4 [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.common.collect.Iterables;
import com.google.common.collect.Maps;
import com.google.devtools.build.lib.collect.compacthashmap.CompactHashMap;
import com.google.errorprone.annotations.ForOverride;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import javax.annotation.Nullable;
/**
* An in-memory graph implementation. All operations are thread-safe with ConcurrentMap semantics.
* Also see {@link NodeEntry}.
*
* <p>This class is public only for use in alternative graph implementations.
*/
public class InMemoryGraphImpl implements InMemoryGraph {
protected final ConcurrentHashMap<SkyKey, InMemoryNodeEntry> nodeMap;
InMemoryGraphImpl() {
this(/*initialCapacity=*/ 1 << 10);
}
protected InMemoryGraphImpl(int initialCapacity) {
this.nodeMap = new ConcurrentHashMap<>(initialCapacity);
}
@Override
public void remove(SkyKey skyKey) {
nodeMap.remove(skyKey);
}
@Override
public NodeEntry get(@Nullable SkyKey requestor, Reason reason, SkyKey skyKey) {
return nodeMap.get(skyKey);
}
@Override
public Map<SkyKey, NodeEntry> getBatch(
SkyKey requestor, Reason reason, Iterable<? extends SkyKey> keys) {
// Use a HashMap, not an ImmutableMap.Builder, because we have not yet deduplicated these keys
// and ImmutableMap.Builder does not tolerate duplicates. The map will be thrown away shortly.
HashMap<SkyKey, NodeEntry> result = new HashMap<>();
for (SkyKey key : keys) {
NodeEntry entry = get(null, Reason.OTHER, key);
if (entry != null) {
result.put(key, entry);
}
}
return result;
}
@ForOverride
protected InMemoryNodeEntry newNodeEntry(SkyKey key) {
return new InMemoryNodeEntry();
}
/**
* This is used to call newNodeEntry() from within computeIfAbsent. Instantiated here to avoid
* lambda instantiation overhead.
*/
@SuppressWarnings("UnnecessaryLambda")
private final Function<SkyKey, InMemoryNodeEntry> newNodeEntryFunction = this::newNodeEntry;
@Override
public Map<SkyKey, NodeEntry> createIfAbsentBatch(
@Nullable SkyKey requestor, Reason reason, Iterable<SkyKey> keys) {
Map<SkyKey, NodeEntry> result = CompactHashMap.createWithExpectedSize(Iterables.size(keys));
for (SkyKey key : keys) {
result.put(key, nodeMap.computeIfAbsent(key, newNodeEntryFunction));
}
return result;
}
@Override
public DepsReport analyzeDepsDoneness(SkyKey parent, Collection<SkyKey> deps) {
return DepsReport.NO_INFORMATION;
}
@Override
public Map<SkyKey, SkyValue> getValues() {
return Collections.unmodifiableMap(Maps.transformValues(nodeMap, InMemoryNodeEntry::toValue));
}
@Override
public Map<SkyKey, InMemoryNodeEntry> getAllValues() {
return Collections.unmodifiableMap(nodeMap);
}
@Override
public ConcurrentHashMap<SkyKey, InMemoryNodeEntry> getAllValuesMutable() {
return nodeMap;
}
static final class EdgelessInMemoryGraphImpl extends InMemoryGraphImpl {
@Override
protected InMemoryNodeEntry newNodeEntry(SkyKey key) {
return new EdgelessInMemoryNodeEntry();
}
@Override
public boolean storesReverseDeps() {
return false;
}
}
}