1 /** 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 package org.apache.hadoop.hbase; 19 20 import java.io.IOException; 21 import java.util.Map; 22 23 import org.apache.hadoop.classification.InterfaceAudience; 24 import org.apache.hadoop.classification.InterfaceStability; 25 26 /** 27 * Get, remove and modify table descriptors. 28 * Used by servers to host descriptors. 29 */ 30 @InterfaceAudience.Public 31 @InterfaceStability.Evolving 32 public interface TableDescriptors { 33 /** 34 * @param tablename 35 * @return HTableDescriptor for tablename 36 * @throws IOException 37 */ 38 public HTableDescriptor get(final String tablename) 39 throws IOException; 40 41 /** 42 * @param tablename 43 * @return HTableDescriptor for tablename 44 * @throws IOException 45 */ 46 public HTableDescriptor get(final byte[] tablename) 47 throws IOException; 48 49 /** 50 * Get Map of all HTableDescriptors. Populates the descriptor cache as a 51 * side effect. 52 * @return Map of all descriptors. 53 * @throws IOException 54 */ 55 public Map<String, HTableDescriptor> getAll() 56 throws IOException; 57 58 /** 59 * Add or update descriptor 60 * @param htd Descriptor to set into TableDescriptors 61 * @throws IOException 62 */ 63 public void add(final HTableDescriptor htd) 64 throws IOException; 65 66 /** 67 * @param tablename 68 * @return Instance of table descriptor or null if none found. 69 * @throws IOException 70 */ 71 public HTableDescriptor remove(final String tablename) 72 throws IOException; 73 }