| // 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.skyframe; |
| |
| import com.google.common.base.Function; |
| import com.google.common.base.Predicates; |
| import com.google.common.collect.Maps; |
| import com.google.devtools.build.lib.util.Preconditions; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| |
| import javax.annotation.Nullable; |
| |
| /** |
| * {@link WalkableGraph} that looks nodes up in a {@link QueryableGraph}. |
| */ |
| public class DelegatingWalkableGraph implements WalkableGraph { |
| |
| private final QueryableGraph fullGraph; |
| private final QueryableGraph thinGraph; |
| |
| public DelegatingWalkableGraph(QueryableGraph graph) { |
| this(graph, graph); |
| } |
| |
| /** |
| * Use this constructor when you want to differentiate reads that require the node value vs reads |
| * that only traverse dependencies. |
| */ |
| public DelegatingWalkableGraph(QueryableGraph fullGraph, QueryableGraph thinGraph) { |
| this.fullGraph = fullGraph; |
| this.thinGraph = thinGraph; |
| } |
| |
| private NodeEntry getEntry(SkyKey key) { |
| NodeEntry entry = Preconditions.checkNotNull(fullGraph.get(key), key); |
| Preconditions.checkState(entry.isDone(), "%s %s", key, entry); |
| return entry; |
| } |
| |
| /** |
| * Returns a map giving the {@link NodeEntry} corresponding to the given {@code keys}. If there is |
| * no node in the graph corresponding to a {@link SkyKey} in {@code keys}, it is silently ignored |
| * and will not be present in the returned map. This tolerance allows callers to avoid |
| * pre-filtering their keys by checking for existence, which can be expensive. |
| */ |
| private static Map<SkyKey, NodeEntry> getEntries(Iterable<SkyKey> keys, QueryableGraph graph) { |
| Map<SkyKey, NodeEntry> result = graph.getBatch(keys); |
| for (Map.Entry<SkyKey, NodeEntry> entry : result.entrySet()) { |
| Preconditions.checkState(entry.getValue().isDone(), entry); |
| } |
| return result; |
| } |
| |
| @Override |
| public boolean exists(SkyKey key) { |
| NodeEntry entry = thinGraph.get(key); |
| return entry != null && entry.isDone(); |
| } |
| |
| @Nullable |
| @Override |
| public SkyValue getValue(SkyKey key) { |
| return getEntry(key).getValue(); |
| } |
| |
| private static final Function<NodeEntry, SkyValue> GET_SKY_VALUE_FUNCTION = |
| new Function<NodeEntry, SkyValue>() { |
| @Nullable |
| @Override |
| public SkyValue apply(NodeEntry entry) { |
| return entry.isDone() ? entry.getValue() : null; |
| } |
| }; |
| |
| @Override |
| public Map<SkyKey, SkyValue> getSuccessfulValues(Iterable<SkyKey> keys) { |
| return Maps.filterValues(Maps.transformValues(fullGraph.getBatch(keys), GET_SKY_VALUE_FUNCTION), |
| Predicates.notNull()); |
| } |
| |
| @Override |
| public Map<SkyKey, Exception> getMissingAndExceptions(Iterable<SkyKey> keys) { |
| Map<SkyKey, Exception> result = new HashMap<>(); |
| Map<SkyKey, NodeEntry> graphResult = fullGraph.getBatch(keys); |
| for (SkyKey key : keys) { |
| NodeEntry nodeEntry = graphResult.get(key); |
| if (nodeEntry == null || !nodeEntry.isDone()) { |
| result.put(key, null); |
| } else { |
| ErrorInfo errorInfo = nodeEntry.getErrorInfo(); |
| if (errorInfo != null) { |
| result.put(key, errorInfo.getException()); |
| } |
| } |
| } |
| return result; |
| } |
| |
| @Nullable |
| @Override |
| public Exception getException(SkyKey key) { |
| ErrorInfo errorInfo = getEntry(key).getErrorInfo(); |
| return errorInfo == null ? null : errorInfo.getException(); |
| } |
| |
| @Override |
| public Map<SkyKey, Iterable<SkyKey>> getDirectDeps(Iterable<SkyKey> keys) { |
| Map<SkyKey, NodeEntry> entries = getEntries(keys, thinGraph); |
| Map<SkyKey, Iterable<SkyKey>> result = new HashMap<>(entries.size()); |
| for (Entry<SkyKey, NodeEntry> entry : entries.entrySet()) { |
| result.put(entry.getKey(), entry.getValue().getDirectDeps()); |
| } |
| return result; |
| } |
| |
| @Override |
| public Map<SkyKey, Iterable<SkyKey>> getReverseDeps(Iterable<SkyKey> keys) { |
| Map<SkyKey, NodeEntry> entries = getEntries(keys, thinGraph); |
| Map<SkyKey, Iterable<SkyKey>> result = new HashMap<>(entries.size()); |
| for (Entry<SkyKey, NodeEntry> entry : entries.entrySet()) { |
| result.put(entry.getKey(), entry.getValue().getReverseDeps()); |
| } |
| return result; |
| } |
| |
| } |