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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.omid.metrics;
19  
20  public interface Counter extends Metric {
21  
22      /**
23       * Increment the counter by one.
24       */
25      void inc();
26  
27      /**
28       * Increment the counter by {@code n}.
29       *
30       * @param n the amount by which the counter will be increased
31       */
32      void inc(long n);
33  
34      /**
35       * Decrement the counter by one.
36       */
37      void dec();
38  
39      /**
40       * Decrement the counter by {@code n}.
41       *
42       * @param n the amount by which the counter will be decreased
43       */
44      void dec(long n);
45  
46  }