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.ipc;
19  
20  import java.lang.annotation.Retention;
21  import java.lang.annotation.RetentionPolicy;
22  
23  import org.apache.hadoop.hbase.HConstants;
24  
25  /**
26   * Annotation which decorates RPC methods to denote the relative priority among other RPCs in the
27   * same server. Provides a basic notion of quality of service (QOS).
28   */
29  @Retention(RetentionPolicy.RUNTIME)
30  public @interface QosPriority {
31    int priority() default HConstants.NORMAL_QOS;
32  }