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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2017-2018 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=========================================================
*/
package org.onap.aai.queries;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import javax.annotation.PostConstruct;
import org.onap.aai.aaf.auth.FileWatcher;
import org.onap.aai.logging.LogFormatTools;
import org.onap.aai.util.AAIConstants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
public class GremlinServerSingleton {
private static Logger logger = LoggerFactory.getLogger(GremlinServerSingleton.class);
private boolean timerSet;
private Timer timer;
private GetCustomQueryConfig queryConfig;
@Value("${schema.queries.location}")
private String storedQueriesLocation;
/**
* 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
*
*/
@PostConstruct
public void init() {
try {
String filepath =
storedQueriesLocation + AAIConstants.AAI_FILESEP + "stored-queries.json";
Path path = Paths.get(filepath);
String customQueryConfigJson = new String(Files.readAllBytes(path));
queryConfig = new GetCustomQueryConfig(customQueryConfigJson);
} catch (IOException e) {
logger.error("Error occurred during the processing of query json file: "
+ LogFormatTools.getStackTop(e));
}
TimerTask task = new FileWatcher(new File(storedQueriesLocation)) {
@Override
protected void onChange(File file) {
try {
String filepath = storedQueriesLocation;
Path path = Paths.get(filepath);
String customQueryConfigJson = new String(Files.readAllBytes(path));
queryConfig = new GetCustomQueryConfig(customQueryConfigJson);
} catch (IOException e) {
logger.error("Error occurred during the processing of query json file: "
+ LogFormatTools.getStackTop(e));
}
}
};
if (!timerSet) {
timerSet = true;
timer = new Timer();
timer.schedule(task, new Date(), 10000);
}
}
/**
* Gets the query using CustomQueryConfig
*
* @param key
* @return
*/
public String getStoredQueryFromConfig(String key) {
CustomQueryConfig customQueryConfig = queryConfig.getStoredQuery(key);
if (customQueryConfig == null) {
return null;
}
return customQueryConfig.getQuery();
}
public CustomQueryConfig getCustomQueryConfig(String key) {
return queryConfig.getStoredQuery(key);
}
}
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