/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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 org.apache.giraph.metrics;
  
  import com.google.common.collect.Maps;
  import com.yammer.metrics.core.Counter;
  import com.yammer.metrics.core.NoOpCounter;
  import com.yammer.metrics.core.NoOpGuage;
  import com.yammer.metrics.core.NoOpHistogram;
  import com.yammer.metrics.core.NoOpMeter;
  import com.yammer.metrics.core.NoOpTimer;
  import com.yammer.metrics.core.Gauge;
  import com.yammer.metrics.core.Histogram;
  import com.yammer.metrics.core.Meter;
  import com.yammer.metrics.core.Metric;
  import com.yammer.metrics.core.MetricName;
  import com.yammer.metrics.core.MetricPredicate;
  import com.yammer.metrics.core.MetricsRegistry;
  import com.yammer.metrics.core.MetricsRegistryListener;
  import com.yammer.metrics.core.Timer;
  
  import java.util.Map;
  import java.util.SortedMap;
  import java.util.concurrent.ConcurrentMap;
  import java.util.concurrent.ScheduledExecutorService;
  import java.util.concurrent.TimeUnit;
  
  /**
   * An empty MetricsRegistry, used to easily turn off all metrics without
   * affecting client code.
   */
  public class NoOpMetricsRegistry extends MetricsRegistry {
    @Override
    public <T> Gauge<T> newGauge(Class<?> klass, String name, Gauge<T> metric) {
      return NoOpGuage.INSTANCE;
    }
  
    @Override
    public <T> Gauge<T> newGauge(Class<?> klass, String name, String scope,
                                 Gauge<T> metric) {
      return NoOpGuage.INSTANCE;
    }
  
    @Override
    public <T> Gauge<T> newGauge(MetricName metricName, Gauge<T> metric) {
      return NoOpGuage.INSTANCE;
    }
  
    @Override
    public Counter newCounter(Class<?> klass, String name) {
      return NoOpCounter.INSTANCE;
    }
  
    @Override
    public Counter newCounter(Class<?> klass, String name, String scope) {
      return NoOpCounter.INSTANCE;
    }
  
    @Override
    public Counter newCounter(MetricName metricName) {
      return NoOpCounter.INSTANCE;
    }
  
    @Override
    public Histogram newHistogram(Class<?> klass, String name, boolean biased) {
      return NoOpHistogram.INSTANCE;
    }
  
    @Override
    public Histogram newHistogram(Class<?> klass, String name, String scope,
                                  boolean biased) {
      return NoOpHistogram.INSTANCE;
    }
  
    @Override
    public Histogram newHistogram(Class<?> klass, String name) {
      return NoOpHistogram.INSTANCE;
    }
  
    @Override
    public Histogram newHistogram(Class<?> klass, String name, String scope) {
      return NoOpHistogram.INSTANCE;
    }
 
   @Override
   public Histogram newHistogram(MetricName metricName, boolean biased) {
     return NoOpHistogram.INSTANCE;
   }
 
   @Override
   public Meter newMeter(Class<?> klass, String name, String eventType,
                         TimeUnit unit) {
     return NoOpMeter.INSTANCE;
   }
 
   @Override
   public Meter newMeter(
     Class<?> klass, String name, String scope, String eventType, TimeUnit unit
   ) {
     return NoOpMeter.INSTANCE;
   }
 
   @Override
   public Meter newMeter(MetricName metricName, String eventType,
                         TimeUnit unit) {
     return NoOpMeter.INSTANCE;
   }
 
   @Override
   public Timer newTimer(Class<?> klass, String name) {
     return NoOpTimer.INSTANCE;
   }
 
   @Override
   public Timer newTimer(Class<?> klass, String name, TimeUnit durationUnit,
                         TimeUnit rateUnit) {
     return NoOpTimer.INSTANCE;
   }
 
   @Override
   public Timer newTimer(Class<?> klass, String name, String scope) {
     return NoOpTimer.INSTANCE;
   }
 
   @Override
   public Timer newTimer(Class<?> klass, String name, String scope,
                         TimeUnit durationUnit, TimeUnit rateUnit
   ) {
     return NoOpTimer.INSTANCE;
   }
 
   @Override
   public Timer newTimer(MetricName metricName, TimeUnit durationUnit,
                         TimeUnit rateUnit) {
     return NoOpTimer.INSTANCE;
   }
 
   @Override
   public Map<MetricName, Metric> allMetrics() {
     return Maps.newHashMap();
   }
 
   @Override
   public SortedMap<String, SortedMap<MetricName, Metric>> groupedMetrics() {
     return Maps.newTreeMap();
   }
 
   @Override
   public SortedMap<String, SortedMap<MetricName, Metric>>
   groupedMetrics(MetricPredicate predicate) {
     return Maps.newTreeMap();
   }
 
   @Override
   public void shutdown() { }
 
   @Override
   public ScheduledExecutorService newScheduledThreadPool(int poolSize,
                                                          String name) {
     return null;
   }
 
   @Override
   public void removeMetric(Class<?> klass, String name) { }
 
   @Override
   public void removeMetric(Class<?> klass, String name, String scope) { }
 
   @Override
   public void removeMetric(MetricName name) { }
 
   @Override
   public void addListener(MetricsRegistryListener listener) { }
 
   @Override
   public void removeListener(MetricsRegistryListener listener) { }
 
   @Override
   protected ConcurrentMap<MetricName, Metric> newMetricsMap() {
     return Maps.newConcurrentMap();
   }
 }