diff options
Diffstat (limited to 'aai-traversal/src/main/java/org/onap/aai/rest/search/GremlinServerSingleton.java')
-rw-r--r-- | aai-traversal/src/main/java/org/onap/aai/rest/search/GremlinServerSingleton.java | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/aai-traversal/src/main/java/org/onap/aai/rest/search/GremlinServerSingleton.java b/aai-traversal/src/main/java/org/onap/aai/rest/search/GremlinServerSingleton.java new file mode 100644 index 0000000..e4ac815 --- /dev/null +++ b/aai-traversal/src/main/java/org/onap/aai/rest/search/GremlinServerSingleton.java @@ -0,0 +1,131 @@ +/** + * ============LICENSE_START======================================================= + * org.onap.aai + * ================================================================================ + * Copyright © 2017 AT&T Intellectual Property. All rights reserved. + * ================================================================================ + * Licensed 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. + * ============LICENSE_END========================================================= + * + * ECOMP is a trademark and service mark of AT&T Intellectual Property. + */ +package org.onap.aai.rest.search; + +import org.onap.aai.util.AAIConstants; +import org.onap.aai.util.FileWatcher; +import com.att.eelf.configuration.EELFLogger; +import com.att.eelf.configuration.EELFManager; +import org.apache.tinkerpop.gremlin.driver.Cluster; + +import java.io.File; +import java.io.FileInputStream; +import java.io.FileNotFoundException; +import java.io.IOException; +import java.util.Date; +import java.util.Properties; +import java.util.Timer; +import java.util.TimerTask; + +public class GremlinServerSingleton { + + private static EELFLogger logger = EELFManager.getInstance().getLogger(GremlinServerSingleton.class); + + private Cluster cluster; + private boolean timerSet; + private Timer timer; + private Properties properties; + + private static class Helper { + private static final GremlinServerSingleton INSTANCE = new GremlinServerSingleton(); + } + + public static GremlinServerSingleton getInstance() { + return Helper.INSTANCE; + } + + private GremlinServerSingleton(){ + init(); + } + + /** + * Initializes the gremlin server singleton + * Loads the configuration of the gremlin server and creates a cluster + * Loads the gremlin query file into the properties object + * Then creates a file watcher to watch the file every ten seconds + * and if there is a change in the file, then reloads the file into + * the properties object + * + */ + private void init() { + + properties = new Properties(); + + try { + cluster = Cluster.build(new File(AAIConstants.AAI_HOME_ETC_APP_PROPERTIES + "gremlin-server-config.yaml")) + .maxContentLength(6537920) + .create(); + } catch (FileNotFoundException e) { + logger.error("Unable to find the file: " + e); + } + + File queryFile = new File(AAIConstants.AAI_HOME_ETC_QUERY); + + try (FileInputStream fis = new FileInputStream(queryFile)){ + properties.load(fis); + } catch (IOException e) { + logger.error("Error occurred during the processing of query file: " + e); + } + + + TimerTask task = new FileWatcher(new File(AAIConstants.AAI_HOME_ETC_QUERY)) { + @Override + protected void onChange(File file) { + File queryFile = new File(AAIConstants.AAI_HOME_ETC_QUERY); + try (FileInputStream fis = new FileInputStream(queryFile)){ + properties.load(fis); + logger.debug("File: " + file + " was changed so the cluster is rebuild for gremlin server"); + } catch (FileNotFoundException e) { + logger.error("Unable to find the file: " + e); + } catch (IOException e) { + logger.error("Error occurred during the processing of query file: " + e); + } + } + }; + + if (!timerSet) { + timerSet = true; + timer = new Timer(); + timer.schedule( task , new Date(), 10000 ); + } + + } + + public Cluster getCluster(){ + return cluster; + } + + /** + * Gets the key if the properties contains that key + * + * Purposely not checking if the property exists due + * to if you check for the property and then get the property + * Then you are going to have to synchronize the method + * + * @param key the query to check if it exists in the file + * @return string if the key exists or null if it doesn't + */ + public String getStoredQuery(String key){ + return (String) properties.get(key); + } + +} |