src/main/java/org/onap/aai/champ/graph/impl/ChampAPIImpl.java

   1 /**
   2  * ============LICENSE_START==========================================
   3  * org.onap.aai
   4  * ===================================================================
   5  * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
   6  * Copyright © 2017 Amdocs
   7  * ===================================================================
   8  * Licensed under the Apache License, Version 2.0 (the "License");
   9  * you may not use this file except in compliance with the License.
  10  * You may obtain a copy of the License at
  11  *
  12  *        http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  * ============LICENSE_END============================================
  20  * ECOMP is a trademark and service mark of AT&T Intellectual Property.
  21  */
  22 package org.onap.aai.champ.graph.impl;
  23
  24 import java.util.Map.Entry;
  25 import java.util.concurrent.ConcurrentHashMap;
  26 import java.util.concurrent.atomic.AtomicBoolean;
  27
  28 import org.onap.aai.champ.ChampAPI;
  29 import org.onap.aai.champ.ChampGraph;
  30 import org.slf4j.Logger;
  31 import org.slf4j.LoggerFactory;
  32
  33 public class ChampAPIImpl implements ChampAPI {
  34
  35         private static final Logger LOGGER = LoggerFactory.getLogger(ChampAPIImpl.class);
  36
  37         private final AtomicBoolean shutdown;
  38         private final ChampGraph.Type type;
  39         private final ConcurrentHashMap<String, ChampGraph> graphs;
  40
  41         public ChampAPIImpl(ChampGraph.Type type) {
  42                 this.type = type;
  43                 this.graphs = new ConcurrentHashMap<String, ChampGraph> ();
  44                 this.shutdown = new AtomicBoolean(false);
  45         }
  46
  47         private ConcurrentHashMap<String, ChampGraph> getGraphs() {
  48                 return graphs;
  49         }
  50
  51         @Override
  52         public ChampGraph getGraph(String graphName) {
  53                 if (shutdown.get()) throw new IllegalStateException("Cannot call getGraph() after shutdown() has been initiated");
  54
  55                 if (getGraphs().containsKey(graphName)) return getGraphs().get(graphName);
  56
  57                 final ChampGraph graph = ChampGraph.Factory.newInstance(type, graphName);
  58
  59                 final ChampGraph existingGraph = getGraphs().putIfAbsent(graphName, graph);
  60
  61                 if (existingGraph == null) return graph;
  62
  63                 return existingGraph;
  64         }
  65
  66         @Override
  67         public void shutdown() {
  68                 if (shutdown.compareAndSet(false, true)) {
  69                         for (Entry<String, ChampGraph> graphEntry : graphs.entrySet()) {
  70                                 LOGGER.info("Shutting down graph {}", graphEntry.getKey());
  71
  72                                 try {
  73                                         graphEntry.getValue().shutdown();
  74                                         LOGGER.info("Graph {} shutdown successfully", graphEntry.getKey());
  75                                 } catch (Throwable t) {
  76                                         LOGGER.warn("Caught exception while shutting down graph " + graphEntry.getKey(), t);
  77                                 }
  78                         }
  79                 }
  80         }
  81
  82         @Override
  83         public ChampGraph.Type getType() {
  84                 return type;
  85         }
  86
  87 }