View Javadoc

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.client;
19  
20  import org.apache.hadoop.conf.Configuration;
21  import org.apache.hadoop.hbase.HConstants;
22  import org.apache.hadoop.hbase.util.ReflectionUtils;
23  
24  /**
25   * Factory to create an {@link RpcRetryingCaller}
26   */
27  public class RpcRetryingCallerFactory {
28  
29    /** Configuration key for a custom {@link RpcRetryingCaller} */
30    public static final String CUSTOM_CALLER_CONF_KEY = "hbase.rpc.callerfactory.class";
31    protected final Configuration conf;
32    private final long pause;
33    private final int retries;
34    private final int startLogErrorsCnt;
35  
36    public RpcRetryingCallerFactory(Configuration conf) {
37      this.conf = conf;
38      pause = conf.getLong(HConstants.HBASE_CLIENT_PAUSE,
39          HConstants.DEFAULT_HBASE_CLIENT_PAUSE);
40      retries = conf.getInt(HConstants.HBASE_CLIENT_RETRIES_NUMBER,
41          HConstants.DEFAULT_HBASE_CLIENT_RETRIES_NUMBER);
42      startLogErrorsCnt = conf.getInt(AsyncProcess.START_LOG_ERRORS_AFTER_COUNT_KEY,
43          AsyncProcess.DEFAULT_START_LOG_ERRORS_AFTER_COUNT);
44    }
45  
46    public <T> RpcRetryingCaller<T> newCaller() {
47      // We store the values in the factory instance. This way, constructing new objects
48      //  is cheap as it does not require parsing a complex structure.
49      return new RpcRetryingCaller<T>(pause, retries, startLogErrorsCnt);
50    }
51  
52    public static RpcRetryingCallerFactory instantiate(Configuration configuration) {
53      String clazzName = RpcRetryingCallerFactory.class.getName();
54      String rpcCallerFactoryClazz =
55          configuration.get(RpcRetryingCallerFactory.CUSTOM_CALLER_CONF_KEY, clazzName);
56      if (rpcCallerFactoryClazz.equals(clazzName)) {
57        return new RpcRetryingCallerFactory(configuration);
58      }
59      return ReflectionUtils.instantiateWithCustomCtor(rpcCallerFactoryClazz,
60        new Class[] { Configuration.class }, new Object[] { configuration });
61    }
62  }