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
19 package org.apache.hadoop.hbase.client;
20
21 import java.io.Closeable;
22 import java.io.IOException;
23
24 /**
25 * A RetryingCallable for master operations.
26 * @param <V> return type
27 */
28 abstract class MasterCallable<V> implements RetryingCallable<V>, Closeable {
29 protected HConnection connection;
30 protected MasterKeepAliveConnection master;
31
32 public MasterCallable(final HConnection connection) {
33 this.connection = connection;
34 }
35
36 @Override
37 public void prepare(boolean reload) throws IOException {
38 this.master = this.connection.getKeepAliveMasterService();
39 }
40
41 @Override
42 public void close() throws IOException {
43 // The above prepare could fail but this would still be called though masterAdmin is null
44 if (this.master != null) this.master.close();
45 }
46
47 @Override
48 public void throwable(Throwable t, boolean retrying) {
49 }
50
51 @Override
52 public String getExceptionMessageAdditionalDetail() {
53 return "";
54 }
55
56 @Override
57 public long sleep(long pause, int tries) {
58 return ConnectionUtils.getPauseTime(pause, tries);
59 }
60 }