| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.atlas.repository.graph; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import org.apache.atlas.ApplicationProperties; |
| import org.apache.atlas.AtlasException; |
| import org.apache.atlas.repository.RepositoryException; |
| import org.apache.atlas.repository.graphdb.AtlasGraph; |
| import org.apache.atlas.repository.graphdb.GraphDatabase; |
| import org.apache.atlas.util.AtlasRepositoryConfiguration; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.springframework.context.annotation.Bean; |
| import org.springframework.context.annotation.Configuration; |
| |
| /** |
| * Provides access to the AtlasGraph |
| * |
| */ |
| @Configuration |
| public class AtlasGraphProvider implements IAtlasGraphProvider { |
| |
| private static volatile GraphDatabase<?,?> graphDb_; |
| |
| private static final Logger LOG = LoggerFactory.getLogger(AtlasGraphProvider.class); |
| private static final Integer MAX_RETRY_COUNT = getMaxRetryCount(); |
| private static final Long RETRY_SLEEP_TIME_MS = getRetrySleepTime(); |
| private static final String GRAPH_REPOSITORY_MAX_RETRIES = "atlas.graph.repository.max.retries"; |
| private static final String GRAPH_REPOSITORY_RETRY_SLEEPTIME = "atlas.graph.repository.retry.sleeptime.ms"; |
| |
| private static org.apache.commons.configuration.Configuration APPLICATION_PROPERTIES = null; |
| |
| public static <V, E> AtlasGraph<V, E> getGraphInstance() { |
| GraphDatabase<?,?> db = getGraphDatabase(); |
| AtlasGraph<?, ?> graph = db.getGraph(); |
| return (AtlasGraph<V, E>) graph; |
| |
| } |
| |
| private static <V, E> GraphDatabase<?,?> getGraphDatabase() { |
| |
| try { |
| if (graphDb_ == null) { |
| synchronized(AtlasGraphProvider.class) { |
| if(graphDb_ == null) { |
| Class implClass = AtlasRepositoryConfiguration.getGraphDatabaseImpl(); |
| graphDb_ = (GraphDatabase<V, E>) implClass.newInstance(); |
| } |
| } |
| } |
| return graphDb_; |
| } |
| catch (IllegalAccessException | InstantiationException e) { |
| throw new RuntimeException("Error initializing graph database", e); |
| } |
| } |
| |
| @VisibleForTesting |
| public static void cleanup() { |
| getGraphDatabase().cleanup(); |
| } |
| |
| @Override |
| @Bean(destroyMethod = "") |
| public AtlasGraph get() throws RepositoryException{ |
| try { |
| return getGraphInstance(); |
| } catch (Exception ex) { |
| LOG.info("Failed to obtain graph instance, retrying " + MAX_RETRY_COUNT + " times, error: " + ex); |
| |
| return retry(); |
| } |
| } |
| |
| private AtlasGraph retry() throws RepositoryException { |
| int retryCounter = 0; |
| |
| while (retryCounter < MAX_RETRY_COUNT) { |
| try { |
| // Retry after 30 sec to get graph instance |
| Thread.sleep(RETRY_SLEEP_TIME_MS); |
| |
| return getGraphInstance(); |
| } catch (Exception ex) { |
| retryCounter++; |
| |
| LOG.info("Failed to obtain graph instance on retry " + retryCounter + " of " + MAX_RETRY_COUNT + " error: " + ex); |
| |
| if (retryCounter >= MAX_RETRY_COUNT) { |
| LOG.info("Max retries exceeded."); |
| break; |
| } |
| } |
| } |
| |
| throw new RepositoryException("Max retries exceeded. Failed to obtain graph instance after " + MAX_RETRY_COUNT + " retries"); |
| } |
| |
| private static Integer getMaxRetryCount() { |
| initApplicationProperties(); |
| |
| return (APPLICATION_PROPERTIES == null) ? 3 : APPLICATION_PROPERTIES.getInt(GRAPH_REPOSITORY_MAX_RETRIES, 3); |
| } |
| |
| private static Long getRetrySleepTime() { |
| initApplicationProperties(); |
| |
| return (APPLICATION_PROPERTIES == null) ? 30000 : APPLICATION_PROPERTIES.getLong(GRAPH_REPOSITORY_RETRY_SLEEPTIME, 30000); |
| } |
| |
| private static void initApplicationProperties() { |
| if (APPLICATION_PROPERTIES == null) { |
| try { |
| APPLICATION_PROPERTIES = ApplicationProperties.get(); |
| } catch (AtlasException ex) { |
| // ignore |
| } |
| } |
| } |
| } |