/*
* 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 ${package};
import org.apache.tinkerpop.gremlin.driver.Cluster;
import org.apache.tinkerpop.gremlin.driver.Client;
import org.apache.tinkerpop.gremlin.driver.Result;
import java.util.Map;
import java.util.HashMap;
import java.util.List;
import java.util.stream.Collectors;
public class Service implements AutoCloseable {
/**
* There typically needs to be only one Cluster instance in an application.
*/
private final Cluster cluster = Cluster.build().port(45940).create();
/**
* Use the Cluster instance to construct different Client instances (e.g. one for sessionless communication
* and one or more sessions). A sessionless Client should be thread-safe and typically no more than one is
* needed unless there is some need to divide connection pools across multiple Client instances. In this case
* there is just a single sessionless Client instance used for the entire App.
*/
private final Client client = cluster.connect();
/**
* Create Service as a singleton given the simplicity of App.
*/
private static final Service INSTANCE = new Service();
private Service() {}
public static Service instance() {
return INSTANCE;
}
public List<String> findCreatorsOfSoftware(String softwareName) throws Exception {
// it is very important from a performance perspective to parameterize queries
Map params = new HashMap();
params.put("n", softwareName);
return client.submit("g.V().hasLabel('software').has('name',n).in('created').values('name')", params)
.all().get().stream().map(r -> r.getString()).collect(Collectors.toList());
}
@Override
public void close() throws Exception {
client.close();
cluster.close();
}
}