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
21 package org.apache.hadoop.hbase.client;
22
23 import org.apache.hadoop.hbase.HRegionLocation;
24 import org.apache.hadoop.hbase.ipc.HRegionInterface;
25
26 import java.io.IOException;
27 import java.util.concurrent.Callable;
28
29 /**
30 * Abstract class that implements Callable, used by retryable actions.
31 * @param <T> the class that the ServerCallable handles
32 */
33 public abstract class ServerCallable<T> implements Callable<T> {
34 protected final HConnection connection;
35 protected final byte [] tableName;
36 protected final byte [] row;
37 protected HRegionLocation location;
38 protected HRegionInterface server;
39
40 /**
41 * @param connection connection callable is on
42 * @param tableName table name callable is on
43 * @param row row we are querying
44 */
45 public ServerCallable(HConnection connection, byte [] tableName, byte [] row) {
46 this.connection = connection;
47 this.tableName = tableName;
48 this.row = row;
49 }
50
51 /**
52 *
53 * @param reload set this to true if connection should re-find the region
54 * @throws IOException e
55 */
56 public void instantiateServer(boolean reload) throws IOException {
57 this.location = connection.getRegionLocation(tableName, row, reload);
58 this.server = connection.getHRegionConnection(location.getServerAddress());
59 }
60
61 /** @return the server name */
62 public String getServerName() {
63 if (location == null) {
64 return null;
65 }
66 return location.getServerAddress().toString();
67 }
68
69 /** @return the region name */
70 public byte[] getRegionName() {
71 if (location == null) {
72 return null;
73 }
74 return location.getRegionInfo().getRegionName();
75 }
76
77 /** @return the row */
78 public byte [] getRow() {
79 return row;
80 }
81 }