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HiveMetaStoreCore.java
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/
HiveMetaStoreCore.java
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/**
* Copyright (C) 2015-2021 Expedia, Inc.
*
* 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.
*/
package com.hotels.beeju.core;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.HiveMetaStoreClient;
public class HiveMetaStoreCore {
private HiveMetaStoreClient client;
private final BeejuCore beejuCore;
public HiveMetaStoreCore(BeejuCore beejuCore) {
this.beejuCore = beejuCore;
}
public void initialise() throws InterruptedException, ExecutionException {
HiveConf hiveConf = new HiveConf(beejuCore.conf(), HiveMetaStoreClient.class);
ExecutorService singleThreadExecutor = Executors.newSingleThreadExecutor();
try {
client = singleThreadExecutor.submit(new CallableHiveClient(hiveConf)).get();
} finally {
singleThreadExecutor.shutdown();
}
}
public void shutdown() {
client.close();
}
/**
* @return the {@link HiveMetaStoreClient} backed by an HSQLDB in-memory database.
*/
public HiveMetaStoreClient client() {
return client;
}
public static class CallableHiveClient implements Callable<HiveMetaStoreClient> {
private final HiveConf hiveConf;
CallableHiveClient(HiveConf hiveConf) {
this.hiveConf = hiveConf;
}
@Override
public HiveMetaStoreClient call() throws Exception {
return new HiveMetaStoreClient(hiveConf);
}
}
}