// 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.common.collect.ImmutableSet;
import com.google.common.collect.Sets;

import java.util.Set;

/** Encapsulates a thread-safe set of SkyKeys. */
public class DirtyKeyTrackerImpl implements DirtyKeyTracker {

  private final Set<SkyKey> dirtyKeys = Sets.newConcurrentHashSet();

  @Override
  public void dirty(SkyKey skyKey) {
    dirtyKeys.add(skyKey);
  }

  @Override
  public void notDirty(SkyKey skyKey) {
    dirtyKeys.remove(skyKey);
  }

  @Override
  public Set<SkyKey> getDirtyKeys() {
    return ImmutableSet.copyOf(dirtyKeys);
  }
}