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 /** 24 * Get, remove and modify table descriptors. 25 * Used by servers to host descriptors. 26 */ 27 public interface TableDescriptors { 28 /** 29 * @param tablename 30 * @return HTableDescriptor for tablename 31 * @throws IOException 32 */ 33 public HTableDescriptor get(final String tablename) 34 throws IOException; 35 36 /** 37 * @param tablename 38 * @return HTableDescriptor for tablename 39 * @throws IOException 40 */ 41 public HTableDescriptor get(final byte[] tablename) 42 throws IOException; 43 44 /** 45 * Get Map of all HTableDescriptors. Populates the descriptor cache as a 46 * side effect. 47 * @return Map of all descriptors. 48 * @throws IOException 49 */ 50 public Map<String, HTableDescriptor> getAll() 51 throws IOException; 52 53 /** 54 * Add or update descriptor 55 * @param htd Descriptor to set into TableDescriptors 56 * @throws IOException 57 */ 58 public void add(final HTableDescriptor htd) 59 throws IOException; 60 61 /** 62 * @param tablename 63 * @return Instance of table descriptor or null if none found. 64 * @throws IOException 65 */ 66 public HTableDescriptor remove(final String tablename) 67 throws IOException; 68 }