001/** 002 * Copyright 2015 DuraSpace, Inc. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016package org.fcrepo.metrics; 017 018import static com.codahale.metrics.SharedMetricRegistries.getOrCreate; 019 020import com.codahale.metrics.MetricRegistry; 021 022/** 023 * Provide helpers for working with the Metrics registry 024 * 025 * @author cbeer 026 * @since Mar 22, 2013 027 */ 028public final class RegistryService { 029 030 private static final MetricRegistry METRICS = getOrCreate("fcrepo-metrics"); 031 032 private static volatile RegistryService instance = null; 033 034 private RegistryService() { 035 // New instances should come from the singleton 036 } 037 038 /** 039 * Create the instance 040 * @return the local object 041 */ 042 public synchronized static RegistryService getInstance() { 043 RegistryService local = instance; 044 if (null == local) { 045 instance = local = new RegistryService(); 046 } 047 return local; 048 } 049 050 /** 051 * Get the current registry service 052 * 053 * TODO the new upstream SharedMetricRegistries may make this obsolete 054 * @return the current registry service 055 */ 056 public MetricRegistry getMetrics() { 057 return METRICS; 058 } 059 060}