champ-lib/champ-core/src/main/java/org/onap/aai/champcore/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.champcore.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.champcore.ChampAPI;
  29 import org.onap.aai.champcore.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 String type;
  39         private final ConcurrentHashMap<String, ChampGraph> graphs;
  40
  41         public ChampAPIImpl(String 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()) {
  54                         throw new IllegalStateException("Cannot call getGraph() after shutdown() has been initiated");
  55                 }
  56
  57                 if (getGraphs().containsKey(graphName)) {
  58                         return getGraphs().get(graphName);
  59                 }
  60
  61                 // At this point, we know a graph with this name doesn't exist. Create and return it.
  62                 final ChampGraph graph = new InMemoryChampGraphImpl.Builder().build();
  63                 graphs.put(graphName, graph);
  64                 return graph;
  65         }
  66
  67         @Override
  68         public void shutdown() {
  69                 if (shutdown.compareAndSet(false, true)) {
  70                         for (Entry<String, ChampGraph> graphEntry : graphs.entrySet()) {
  71                                 LOGGER.info("Shutting down graph {}", graphEntry.getKey());
  72
  73                                 try {
  74                                         graphEntry.getValue().shutdown();
  75                                         LOGGER.info("Graph {} shutdown successfully", graphEntry.getKey());
  76                                 } catch (Throwable t) {
  77                                         LOGGER.warn("Caught exception while shutting down graph " + graphEntry.getKey(), t);
  78                                 }
  79                         }
  80                 }
  81         }
  82
  83         @Override
  84         public String getType() {
  85                 return type;
  86         }
  87
  88 }