| /* |
| * 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.hadoop.hbase.quotas; |
| |
| import java.util.Iterator; |
| import java.util.Map.Entry; |
| |
| import org.apache.hadoop.hbase.client.RegionInfo; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| /** |
| * A {@link RegionSizeStore} implementation that stores nothing. |
| */ |
| @InterfaceAudience.Private |
| public final class NoOpRegionSizeStore implements RegionSizeStore { |
| private static final NoOpRegionSizeStore INSTANCE = new NoOpRegionSizeStore(); |
| |
| private NoOpRegionSizeStore() {} |
| |
| public static NoOpRegionSizeStore getInstance() { |
| return INSTANCE; |
| } |
| |
| @Override |
| public Iterator<Entry<RegionInfo,RegionSize>> iterator() { |
| return null; |
| } |
| |
| @Override |
| public long heapSize() { |
| return 0; |
| } |
| |
| @Override |
| public RegionSize getRegionSize(RegionInfo regionInfo) { |
| return null; |
| } |
| |
| @Override |
| public void put(RegionInfo regionInfo, long size) {} |
| |
| @Override |
| public void incrementRegionSize(RegionInfo regionInfo, long delta) {} |
| |
| @Override |
| public RegionSize remove(RegionInfo regionInfo) { |
| return null; |
| } |
| |
| @Override |
| public int size() { |
| return 0; |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| return true; |
| } |
| |
| @Override |
| public void clear() {} |
| } |