com.spotify.apollo.metrics.semantic.MetricsConfig Maven / Gradle / Ivy

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/*
 * -\-\-
 * Spotify Apollo Metrics Module
 * --
 * Copyright (C) 2013 - 2016 Spotify AB
 * --
 * 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.spotify.apollo.metrics.semantic;

import com.typesafe.config.Config;

import java.util.Collections;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.inject.Inject;

import static com.spotify.apollo.metrics.semantic.What.DROPPED_REQUEST_RATE;
import static com.spotify.apollo.metrics.semantic.What.ENDPOINT_REQUEST_DURATION;
import static com.spotify.apollo.metrics.semantic.What.ENDPOINT_REQUEST_RATE;
import static com.spotify.apollo.metrics.semantic.What.ERROR_RATIO;

public class MetricsConfig {

  // visible for testing
  @SuppressWarnings("WeakerAccess")
  static final Set DEFAULT_ENABLED_METRICS =
      EnumSet.of(
          ENDPOINT_REQUEST_RATE,
          ENDPOINT_REQUEST_DURATION,
          DROPPED_REQUEST_RATE,
          ERROR_RATIO);

  private final Set enabledMetrics;
  private final Set precreateCodes;

  @Inject
  MetricsConfig(Config config) {
    if (config.hasPath("metrics.server")) {
      enabledMetrics = parseConfig(config.getStringList("metrics.server"));
    } else {
      enabledMetrics = DEFAULT_ENABLED_METRICS;
    }

    if (config.hasPath("metrics.precreate-codes")) {
      precreateCodes = new HashSet<>(config.getIntList("metrics.precreate-codes"));
    } else {
      precreateCodes = Collections.emptySet();
    }
  }

  private Set parseConfig(List metrics) {
    EnumSet result = EnumSet.noneOf(What.class);

    for (String metricName : metrics) {
      result.add(What.valueOf(metricName));
    }

    return result;
  }

  public Set serverMetrics() {
    return enabledMetrics;
  }

  public Set precreateCodes() {
    return precreateCodes;
  }
}