com.google.devtools.build.skyframe.DelegatingWalkableGraph.java Source code

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Here is the source code for com.google.devtools.build.skyframe.DelegatingWalkableGraph.java

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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.skyframe;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.collect.Maps;
import com.google.devtools.build.lib.util.Preconditions;
import com.google.devtools.build.skyframe.QueryableGraph.Reason;
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 graph;

    public DelegatingWalkableGraph(QueryableGraph graph) {
        this.graph = graph;
    }

    @Nullable
    private NodeEntry getEntryForValue(SkyKey key) throws InterruptedException {
        NodeEntry entry = graph.getBatch(null, Reason.WALKABLE_GRAPH_VALUE, ImmutableList.of(key)).get(key);
        return entry != null && entry.isDone() ? entry : null;
    }

    @Nullable
    @Override
    public SkyValue getValue(SkyKey key) throws InterruptedException {
        NodeEntry entry = getEntryForValue(key);
        return entry == null ? null : entry.getValue();
    }

    private static SkyValue getValue(NodeEntry entry) throws InterruptedException {
        return entry.isDone() ? entry.getValue() : null;
    }

    @Override
    public Map<SkyKey, SkyValue> getSuccessfulValues(Iterable<SkyKey> keys) throws InterruptedException {
        Map<SkyKey, ? extends NodeEntry> batchGet = graph.getBatch(null, Reason.WALKABLE_GRAPH_VALUE, keys);
        Map<SkyKey, SkyValue> result = Maps.newHashMapWithExpectedSize(batchGet.size());
        for (Entry<SkyKey, ? extends NodeEntry> entryPair : batchGet.entrySet()) {
            SkyValue value = getValue(entryPair.getValue());
            if (value != null) {
                result.put(entryPair.getKey(), value);
            }
        }
        return result;
    }

    @Override
    public Map<SkyKey, Exception> getMissingAndExceptions(Iterable<SkyKey> keys) throws InterruptedException {
        Map<SkyKey, Exception> result = new HashMap<>();
        Map<SkyKey, ? extends NodeEntry> graphResult = graph.getBatch(null, Reason.WALKABLE_GRAPH_VALUE, 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;
    }

    @Override
    public boolean isCycle(SkyKey key) throws InterruptedException {
        NodeEntry entry = getEntryForValue(key);
        if (entry == null) {
            return false;
        }
        ErrorInfo errorInfo = entry.getErrorInfo();
        return errorInfo != null && !Iterables.isEmpty(errorInfo.getCycleInfo());
    }

    @Nullable
    @Override
    public Exception getException(SkyKey key) throws InterruptedException {
        NodeEntry entry = getEntryForValue(key);
        if (entry == null) {
            return null;
        }
        ErrorInfo errorInfo = entry.getErrorInfo();
        return errorInfo == null ? null : errorInfo.getException();
    }

    @Override
    public Map<SkyKey, Iterable<SkyKey>> getDirectDeps(Iterable<SkyKey> keys) throws InterruptedException {
        Map<SkyKey, ? extends NodeEntry> entries = graph.getBatch(null, Reason.WALKABLE_GRAPH_DEPS, keys);
        Map<SkyKey, Iterable<SkyKey>> result = new HashMap<>(entries.size());
        for (Entry<SkyKey, ? extends NodeEntry> entry : entries.entrySet()) {
            Preconditions.checkState(entry.getValue().isDone(), entry);
            result.put(entry.getKey(), entry.getValue().getDirectDeps());
        }
        return result;
    }

    @Override
    public Map<SkyKey, Iterable<SkyKey>> getReverseDeps(Iterable<SkyKey> keys) throws InterruptedException {
        Map<SkyKey, ? extends NodeEntry> entries = graph.getBatch(null, Reason.WALKABLE_GRAPH_RDEPS, keys);
        Map<SkyKey, Iterable<SkyKey>> result = new HashMap<>(entries.size());
        for (Entry<SkyKey, ? extends NodeEntry> entry : entries.entrySet()) {
            Preconditions.checkState(entry.getValue().isDone(), entry);
            result.put(entry.getKey(), entry.getValue().getReverseDeps());
        }
        return result;
    }

    @Override
    public Iterable<SkyKey> getCurrentlyAvailableNodes(Iterable<SkyKey> keys, Reason reason) {
        return graph.getCurrentlyAvailableNodes(keys, reason);
    }

}