-
- /**
- * Performs all one-time configuration operations which are required when creating
- * a new instance of the DAO.
- */
- private void configure() {
-
- // Instantiate the Champ library API.
- try {
-
- // Determine which back end we are using.
- switch (getBackendTypeFromConfig()) {
-
- case IN_MEMORY:
-
- logger.info(CrudServiceMsgs.INSTANTIATE_GRAPH_DAO,
- "In Memory",
- daoConfig.getProperty(CONFIG_GRAPH_NAME, DEFAULT_GRAPH_NAME),
- "Not applicable");
-
- champApi = ChampGraph.Factory.newInstance(ChampGraph.Type.IN_MEMORY,
- daoConfig.getProperty(CONFIG_GRAPH_NAME, DEFAULT_GRAPH_NAME));
-
- break;
-
- case TITAN:
- try {
- String db = daoConfig.getProperty(CONFIG_STORAGE_BACKEND_DB);
- Short graphIdSuffix = (short) new Random().nextInt(Short.MAX_VALUE);
- logger.info(CrudServiceMsgs.TITAN_GRAPH_INFO, GRAPH_UNQ_INSTANCE_ID_SUFFIX
- + ": = " + graphIdSuffix);
- if (db.equalsIgnoreCase(STORAGE_CASSANDRA_DB)) {
- logger.info(CrudServiceMsgs.INSTANTIATE_GRAPH_DAO, "Titan with cassandra backend",
- daoConfig.getProperty(CONFIG_GRAPH_NAME, DEFAULT_GRAPH_NAME),
- daoConfig.getProperty(CONFIG_STORAGE_HOSTNAMES));
-
- TitanChampGraphImpl.Builder champApiBuilder =
- new TitanChampGraphImpl.Builder(daoConfig.getProperty(CONFIG_GRAPH_NAME,
- DEFAULT_GRAPH_NAME))
- .property("storage.backend", "cassandrathrift")
- .property(GRAPH_UNQ_INSTANCE_ID_SUFFIX, graphIdSuffix)
- .property("storage.hostname", daoConfig.get(CONFIG_STORAGE_HOSTNAMES));
-
- if (daoConfig.containsKey(CONFIG_EVENT_STREAM_PUBLISHER)) {
- champApiBuilder.property("champ.event.stream.publisher",
- daoConfig.get(CONFIG_EVENT_STREAM_PUBLISHER));
- }
-
- if (daoConfig.containsKey(CONFIG_EVENT_STREAM_NUM_PUBLISHERS)) {
- champApiBuilder.property("champ.event.stream.publisher-pool-size",
- daoConfig.get(CONFIG_EVENT_STREAM_NUM_PUBLISHERS));
- }
-
- champApi = champApiBuilder.build();
-
- } else if (db.equalsIgnoreCase(STORAGE_HBASE_DB)) {
-
- logger.info(CrudServiceMsgs.INSTANTIATE_GRAPH_DAO, "Titan with Hbase backend",
- daoConfig.getProperty(CONFIG_GRAPH_NAME, DEFAULT_GRAPH_NAME),
- daoConfig.getProperty(CONFIG_STORAGE_HOSTNAMES));
- TitanChampGraphImpl.Builder champApiBuilder =
- new TitanChampGraphImpl.Builder(daoConfig
- .getProperty(CONFIG_GRAPH_NAME, DEFAULT_GRAPH_NAME))
- .property("storage.backend", "hbase")
- .property("storage.hbase.ext.zookeeper.znode.parent",
- daoConfig.get(CONFIG_HBASE_ZNODE_PARENT))
- .property("storage.port", daoConfig.get(CONFIG_STORAGE_PORT))
- .property(GRAPH_UNQ_INSTANCE_ID_SUFFIX, graphIdSuffix)
- .property("storage.hostname", daoConfig.get(CONFIG_STORAGE_HOSTNAMES));
-
- if (daoConfig.containsKey(CONFIG_EVENT_STREAM_PUBLISHER)) {
- champApiBuilder.property("champ.event.stream.publisher",
- daoConfig.get(CONFIG_EVENT_STREAM_PUBLISHER));
- }
-
- if (daoConfig.containsKey(CONFIG_EVENT_STREAM_NUM_PUBLISHERS)) {
- champApiBuilder.property("champ.event.stream.publisher-pool-size",
- daoConfig.get(CONFIG_EVENT_STREAM_NUM_PUBLISHERS));
- }
- champApi = champApiBuilder.build();
- } else {
- logger.error(CrudServiceMsgs.INVALID_GRAPH_BACKEND,
- daoConfig.getProperty(CONFIG_STORAGE_BACKEND_DB));
- }
-
- } catch (com.thinkaurelius.titan.core.TitanException e) {
-
- logger.error(CrudServiceMsgs.INSTANTIATE_GRAPH_BACKEND_ERR, "Titan", e.getMessage());
- }
-
-
- break;
-
- default:
- logger.error(CrudServiceMsgs.INVALID_GRAPH_BACKEND,
- daoConfig.getProperty(CONFIG_STORAGE_BACKEND));
- break;
- }
-
- } catch (CrudException e) {
- logger.error(CrudServiceMsgs.INSTANTIATE_GRAPH_BACKEND_ERR,
- daoConfig.getProperty(CONFIG_STORAGE_BACKEND), e.getMessage());
- }
- }
-
-