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/*
 * Copyright 2014 Ben Manes. 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.github.benmanes.caffeine.cache.stats;

import static java.util.Objects.requireNonNull;

import org.checkerframework.checker.index.qual.NonNegative;

import com.github.benmanes.caffeine.cache.RemovalCause;

/**
 * A {@link StatsCounter} implementation that does not record any cache events.
 *
 * @author [email protected] (Ben Manes)
 */
enum DisabledStatsCounter implements StatsCounter {
  INSTANCE;

  @Override
  public void recordHits(int count) {}

  @Override
  public void recordMisses(int count) {}

  @Override
  public void recordLoadSuccess(long loadTime) {}

  @Override
  public void recordLoadFailure(long loadTime) {}

  @Override
  public void recordEviction(@NonNegative int weight, RemovalCause cause) {
    requireNonNull(cause);
  }

  @Override
  public CacheStats snapshot() {
    return CacheStats.empty();
  }

  @Override
  public String toString() {
    return snapshot().toString();
  }
}