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 © 2017-2018 AT&T Intellectual Property. All rights reserved.
   6  * Copyright © 2017-2018 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  */
  21 package org.onap.aai.champcore.graph.impl;
  22
  23 import java.util.Map.Entry;
  24 import java.util.concurrent.ConcurrentHashMap;
  25 import java.util.concurrent.atomic.AtomicBoolean;
  26
  27 import org.onap.aai.champcore.ChampAPI;
  28 import org.onap.aai.champcore.ChampCoreMsgs;
  29 import org.onap.aai.champcore.ChampGraph;
  30 import org.onap.aai.cl.api.Logger;
  31 import org.onap.aai.cl.eelf.LoggerFactory;
  32
  33
  34 public class ChampAPIImpl implements ChampAPI {
  35
  36         private static final Logger LOGGER = LoggerFactory.getInstance().getLogger(ChampAPIImpl.class);
  37
  38         private final AtomicBoolean shutdown;
  39         private final String type;
  40         private final ConcurrentHashMap<String, ChampGraph> graphs;
  41
  42         public ChampAPIImpl(String type) {
  43                 this.type = type;
  44                 this.graphs = new ConcurrentHashMap<String, ChampGraph> ();
  45                 this.shutdown = new AtomicBoolean(false);
  46         }
  47
  48         private ConcurrentHashMap<String, ChampGraph> getGraphs() {
  49           return graphs;
  50         }
  51
  52         @Override
  53         public ChampGraph getGraph(String graphName) {
  54                 if (shutdown.get()) {
  55                         throw new IllegalStateException("Cannot call getGraph() after shutdown() has been initiated");
  56                 }
  57
  58                 if (getGraphs().containsKey(graphName)) {
  59                         return getGraphs().get(graphName);
  60                 }
  61
  62                 // At this point, we know a graph with this name doesn't exist. Create and return it.
  63                 final ChampGraph graph = new InMemoryChampGraphImpl.Builder().build();
  64                 graphs.put(graphName, graph);
  65                 return graph;
  66         }
  67
  68         @Override
  69         public void shutdown() {
  70                 if (shutdown.compareAndSet(false, true)) {
  71                         for (Entry<String, ChampGraph> graphEntry : graphs.entrySet()) {
  72                                 LOGGER.info(ChampCoreMsgs.CHAMPCORE_CHAMP_API_IMPL_INFO,
  73                                     String.format("Shutting down graph %s", graphEntry.getKey()));
  74
  75                                 try {
  76                                         graphEntry.getValue().shutdown();
  77                                         LOGGER.info(ChampCoreMsgs.CHAMPCORE_CHAMP_API_IMPL_INFO,
  78                                             String.format("Graph %s shutdown successfully", graphEntry.getKey()));
  79                                 } catch (Throwable t) {
  80                                         LOGGER.warn(ChampCoreMsgs.CHAMPCORE_CHAMP_API_IMPL_WARN,
  81                                             String.format("Caught exception while shutting down graph %s: %s", graphEntry.getKey(), t.getMessage()));
  82                                 }
  83                         }
  84                 }
  85         }
  86
  87         @Override
  88         public String getType() {
  89                 return type;
  90         }
  91
  92 }