hugegraph-server/hugegraph-example/src/main/java/org/apache/hugegraph/example/ExampleUtil.java

/*
 * 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.hugegraph.example;

import java.io.File;
import java.util.Iterator;
import java.util.concurrent.TimeoutException;
import org.slf4j.Logger;

import org.apache.hugegraph.HugeException;
import org.apache.hugegraph.HugeFactory;
import org.apache.hugegraph.HugeGraph;
import org.apache.hugegraph.backend.id.IdGenerator;
import org.apache.hugegraph.dist.RegisterUtil;
import org.apache.hugegraph.perf.PerfUtil;
import org.apache.hugegraph.task.HugeTask;
import org.apache.hugegraph.task.TaskScheduler;
import org.apache.hugegraph.type.define.NodeRole;
import org.apache.hugegraph.util.Log;

public class ExampleUtil {
    private static final Logger LOG = Log.logger(ExampleUtil.class);

    private static boolean registered = false;

    public static void registerPlugins() {
        if (registered) {
            return;
        }
        registered = true;

        RegisterUtil.registerCassandra();
        RegisterUtil.registerScyllaDB();
        RegisterUtil.registerHBase();
        RegisterUtil.registerRocksDB();
        RegisterUtil.registerMysql();
        RegisterUtil.registerPalo();
    }

    public static HugeGraph loadGraph() {
        return loadGraph(true, false);
    }

    public static HugeGraph loadGraph(boolean needClear, boolean needProfile) {
        if (needProfile) {
            profile();
        }

        registerPlugins();

        String conf = "hugegraph.properties";
        try {
            String path = ExampleUtil.class.getClassLoader()
                                     .getResource(conf).getPath();
            File file = new File(path);
            if (file.exists() && file.isFile()) {
                conf = path;
            }
        } catch (Exception ignored) {
            LOG.warn("loadGraph warn {} ",ignored);
        }

        HugeGraph graph = HugeFactory.open(conf);

        if (needClear) {
            graph.clearBackend();
        }
        graph.initBackend();
        graph.serverStarted(IdGenerator.of("server1"), NodeRole.MASTER);

        return graph;
    }

    public static void profile() {
        try {
            PerfUtil.instance().profilePackage("org.apache.hugegraph");
        } catch (Throwable e) {
            throw new RuntimeException(e);
        }
    }

    public static void waitAllTaskDone(HugeGraph graph) {
        TaskScheduler scheduler = graph.taskScheduler();
        Iterator<HugeTask<Object>> tasks = scheduler.tasks(null, -1L, null);
        while (tasks.hasNext()) {
            try {
                scheduler.waitUntilTaskCompleted(tasks.next().id(), 20L);
            } catch (TimeoutException e) {
                throw new HugeException("Failed to wait task done", e);
            }
        }
    }
}