1 /** 2 * Copyright 2010 The Apache Software Foundation 3 * 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 package org.apache.hadoop.hbase.regionserver; 21 22 /** 23 * Interface to Map of online regions. In the Map, the key is the region's 24 * encoded name and the value is an {@link HRegion} instance. 25 */ 26 interface OnlineRegions { 27 /** 28 * Add to online regions. 29 * @param r 30 */ 31 public void addToOnlineRegions(final HRegion r); 32 33 /** 34 * This method removes HRegion corresponding to hri from the Map of onlineRegions. 35 * 36 * @param encodedRegionName 37 * @return True if we removed a region from online list. 38 */ 39 public boolean removeFromOnlineRegions(String encodedRegionName); 40 41 /** 42 * Return {@link HRegion} instance. 43 * Only works if caller is in same context, in same JVM. HRegion is not 44 * serializable. 45 * @param encodedRegionName 46 * @return HRegion for the passed encoded <code>encodedRegionName</code> or 47 * null if named region is not member of the online regions. 48 */ 49 public HRegion getFromOnlineRegions(String encodedRegionName); 50 }