Github user randomstatistic commented on a diff in the pull request:

    https://github.com/apache/lucene-solr/pull/120#discussion_r90144072
  
    --- Diff: solr/core/src/java/org/apache/solr/metrics/SolrMetricManager.java 
---
    @@ -0,0 +1,216 @@
    +/*
    + * 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.solr.metrics;
    +
    +import java.util.Set;
    +
    +import com.codahale.metrics.Counter;
    +import com.codahale.metrics.Histogram;
    +import com.codahale.metrics.Meter;
    +import com.codahale.metrics.MetricFilter;
    +import com.codahale.metrics.MetricRegistry;
    +import com.codahale.metrics.SharedMetricRegistries;
    +import com.codahale.metrics.Snapshot;
    +import com.codahale.metrics.Timer;
    +import org.apache.solr.common.util.NamedList;
    +
    +/**
    + *
    + */
    +public class SolrMetricManager {
    +
    +  public static final String REGISTRY_NAME_PREFIX = "solr";
    +  public static final String DEFAULT_REGISTRY = 
MetricRegistry.name(REGISTRY_NAME_PREFIX, "default");
    +
    +  // don't create instances of this class
    +  private SolrMetricManager() { }
    +
    +
    +  /**
    +   * Return a set of existing registry names.
    +   */
    +  public static Set<String> registryNames() {
    +    return SharedMetricRegistries.names();
    +  }
    +
    +  /**
    +   * Get (or create if not present) a named registry
    +   * @param registry name of the registry
    +   * @return existing or newly created registry
    +   */
    +  public static MetricRegistry registryFor(String registry) {
    +    return 
SharedMetricRegistries.getOrCreate(overridableRegistryName(registry));
    +  }
    +
    +  /**
    +   * Remove all metrics from a specified registry.
    +   * @param registry registry name
    +   */
    +  public static void clearRegistryFor(String registry) {
    +    
SharedMetricRegistries.getOrCreate(overridableRegistryName(registry)).removeMatching(MetricFilter.ALL);
    --- End diff --
    
    This, and several other places below could delegate to 
`registryFor(registry)`


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