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// Copyright 2014 Google Inc. 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.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
import java.util.Map;
import java.util.Set;
import javax.annotation.Nullable;
/**
* A graph that exposes its entries and structure, for use by classes that must traverse it.
*/
@ThreadSafe
public interface QueryableGraph {
/**
* Returns the node with the given name, or {@code null} if the node does not exist.
*/
@Nullable
NodeEntry get(SkyKey key);
/**
* Fetches all the given nodes. Returns a map {@code m} such that {@code m.get(k).equals(e)} for
* all {@code k} such that {@code get(k) == e} and {@code e != null}.
*/
Map<SkyKey, NodeEntry> getBatch(Set<SkyKey> keys);
}