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// Copyright (C) 2015 The Android Open Source Project
//
// 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.gerrit.metrics;

import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableSet;
import com.google.gerrit.extensions.registration.RegistrationHandle;
import java.util.Set;

/** Factory to create metrics for monitoring. */
public abstract class MetricMaker {
  /**
   * Metric whose value increments during the life of the process.
   *
   * @param name field name
   * @param desc field description
   * @return counter
   */
  public abstract Counter0 newCounter(String name, Description desc);

  public abstract  Counter1 newCounter(String name, Description desc, Field field1);

  public abstract  Counter2 newCounter(
      String name, Description desc, Field field1, Field field2);

  public abstract  Counter3 newCounter(
      String name, Description desc, Field field1, Field field2, Field field3);

  /**
   * Metric recording time spent on an operation.
   *
   * @param name field name
   * @param desc field description
   * @return timer
   */
  public abstract Timer0 newTimer(String name, Description desc);

  public abstract  Timer1 newTimer(String name, Description desc, Field field1);

  public abstract  Timer2 newTimer(
      String name, Description desc, Field field1, Field field2);

  public abstract  Timer3 newTimer(
      String name, Description desc, Field field1, Field field2, Field field3);

  /**
   * Metric recording statistical distribution of values.
   *
   * @param name field name
   * @param desc field description
   * @return histogram
   */
  public abstract Histogram0 newHistogram(String name, Description desc);

  public abstract  Histogram1 newHistogram(String name, Description desc, Field field1);

  public abstract  Histogram2 newHistogram(
      String name, Description desc, Field field1, Field field2);

  public abstract  Histogram3 newHistogram(
      String name, Description desc, Field field1, Field field2, Field field3);

  /**
   * Constant value that does not change.
   *
   * @param name unique name of the metric.
   * @param value only value of the metric.
   * @param desc description of the metric.
   */
  public  void newConstantMetric(String name, final V value, Description desc) {
    desc.setConstant();

    @SuppressWarnings("unchecked")
    Class type = (Class) value.getClass();
    final CallbackMetric0 metric = newCallbackMetric(name, type, desc);
    newTrigger(
        metric,
        new Runnable() {
          @Override
          public void run() {
            metric.set(value);
          }
        });
  }

  /**
   * Instantaneous reading of a value.
   *
   *    * metricMaker.newCallbackMetric("memory",
   *     new Description("Total bytes of memory used")
   *        .setGauge()
   *        .setUnit(Units.BYTES),
   *     new Supplier<Long>() {
   *       public Long get() {
   *         return Runtime.getRuntime().totalMemory();
   *       }
   *     });
   * 
   *
   * @param name unique name of the metric.
   * @param valueClass type of value recorded by the metric.
   * @param desc description of the metric.
   * @param trigger function to compute the value of the metric.
   */
  public  void newCallbackMetric(
      String name, Class valueClass, Description desc, final Supplier trigger) {
    final CallbackMetric0 metric = newCallbackMetric(name, valueClass, desc);
    newTrigger(
        metric,
        new Runnable() {
          @Override
          public void run() {
            metric.set(trigger.get());
          }
        });
  }

  /**
   * Instantaneous reading of a single value.
   *
   * @param name field name
   * @param valueClass field type
   * @param desc field description
   * @return callback
   */
  public abstract  CallbackMetric0 newCallbackMetric(
      String name, Class valueClass, Description desc);

  public abstract  CallbackMetric1 newCallbackMetric(
      String name, Class valueClass, Description desc, Field field1);

  /**
   * Connect logic to populate a previously created {@link CallbackMetric}.
   *
   * @param metric1 previously created callback
   * @param trigger trigger to connect
   * @return registration handle
   */
  public RegistrationHandle newTrigger(CallbackMetric metric1, Runnable trigger) {
    return newTrigger(ImmutableSet.>of(metric1), trigger);
  }

  public RegistrationHandle newTrigger(
      CallbackMetric metric1, CallbackMetric metric2, Runnable trigger) {
    return newTrigger(ImmutableSet.of(metric1, metric2), trigger);
  }

  public RegistrationHandle newTrigger(
      CallbackMetric metric1,
      CallbackMetric metric2,
      CallbackMetric metric3,
      Runnable trigger) {
    return newTrigger(ImmutableSet.of(metric1, metric2, metric3), trigger);
  }

  public abstract RegistrationHandle newTrigger(Set> metrics, Runnable trigger);

  /**
   * Sanitize the given metric name.
   *
   * @param name the name to sanitize.
   * @return sanitized version of the name.
   */
  public String sanitizeMetricName(String name) {
    return name;
  }
}