1 package org.apache.helix.alerts;
2
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,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 public abstract class Aggregator {
23
24 int _numArgs;
25
26 public Aggregator()
27 {
28
29 }
30
31 /*
32 * Take curr and new values. Update curr.
33 */
34 public abstract void merge(Tuple<String> currVal, Tuple<String> newVal,
35 Tuple<String> currTime, Tuple<String> newTime, String... args);
36
37 public int getRequiredNumArgs()
38 {
39 return _numArgs;
40 }
41
42 }