001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.regionserver.throttle;
019
020import org.apache.hadoop.conf.Configuration;
021import org.apache.hadoop.hbase.HBaseInterfaceAudience;
022import org.apache.yetus.audience.InterfaceAudience;
023import org.slf4j.Logger;
024import org.slf4j.LoggerFactory;
025import org.apache.hadoop.hbase.regionserver.RegionServerServices;
026import org.apache.hadoop.util.ReflectionUtils;
027
028@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
029public final class FlushThroughputControllerFactory {
030
031  private static final Logger LOG = LoggerFactory.getLogger(FlushThroughputControllerFactory.class);
032
033  public static final String HBASE_FLUSH_THROUGHPUT_CONTROLLER_KEY =
034      "hbase.regionserver.flush.throughput.controller";
035
036  private static final Class<? extends ThroughputController>
037      DEFAULT_FLUSH_THROUGHPUT_CONTROLLER_CLASS = NoLimitThroughputController.class;
038
039  private FlushThroughputControllerFactory() {
040  }
041
042  public static ThroughputController create(RegionServerServices server,
043      Configuration conf) {
044    Class<? extends ThroughputController> clazz = getThroughputControllerClass(conf);
045    ThroughputController controller = ReflectionUtils.newInstance(clazz, conf);
046    controller.setup(server);
047    return controller;
048  }
049
050  public static Class<? extends ThroughputController> getThroughputControllerClass(
051      Configuration conf) {
052    String className =
053        conf.get(HBASE_FLUSH_THROUGHPUT_CONTROLLER_KEY,
054          DEFAULT_FLUSH_THROUGHPUT_CONTROLLER_CLASS.getName());
055    try {
056      return Class.forName(className).asSubclass(ThroughputController.class);
057    } catch (Exception e) {
058      LOG.warn(
059        "Unable to load configured flush throughput controller '" + className
060            + "', load default throughput controller "
061            + DEFAULT_FLUSH_THROUGHPUT_CONTROLLER_CLASS.getName() + " instead", e);
062      return DEFAULT_FLUSH_THROUGHPUT_CONTROLLER_CLASS;
063    }
064  }
065}