java/dagger/internal/codegen/DaggerStatistics.java

/*
 * Copyright (C) 2018 The Dagger Authors.
 *
 * 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 dagger.internal.codegen;

import com.google.common.base.Preconditions;
import com.google.common.base.Stopwatch;
import com.google.common.base.Ticker;
import javax.inject.Inject;
import javax.inject.Singleton;

@Singleton // for state sharing
final class DaggerStatistics {

  private final Stopwatch totalRuntimeStopwatch;

  @Inject
  DaggerStatistics(
      Ticker ticker) {
    totalRuntimeStopwatch = Stopwatch.createUnstarted(ticker);
  }

  void processingStarted() {
    Preconditions.checkState(!totalRuntimeStopwatch.isRunning());
    totalRuntimeStopwatch.start();
  }

  void processingStopped() {
    Preconditions.checkState(totalRuntimeStopwatch.isRunning());
    totalRuntimeStopwatch.stop();

  }
}