| /* |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.hadoop.hive.metastore; |
| |
| import org.apache.hadoop.conf.Configurable; |
| import org.apache.hadoop.conf.Configuration; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * Any task that will run as a separate thread in the metastore should implement this |
| * interface. |
| */ |
| public interface MetastoreTaskThread extends Configurable, Runnable { |
| |
| /** |
| * Get the frequency at which the thread should be scheduled in the thread pool. You must call |
| * {@link #setConf(Configuration)} before calling this method. |
| * @param unit TimeUnit to express the frequency in. |
| * @return frequency |
| */ |
| long runFrequency(TimeUnit unit); |
| |
| /** |
| * Gets the initial delay before the first execution. |
| * |
| * Defaults to {@link #runFrequency(TimeUnit)} |
| */ |
| default long initialDelay(TimeUnit unit) { |
| return runFrequency(unit); |
| } |
| } |