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1   /**
2    * Copyright (c) 2014, stateful.co
3    * All rights reserved.
4    *
5    * Redistribution and use in source and binary forms, with or without
6    * modification, are permitted provided that the following conditions
7    * are met: 1) Redistributions of source code must retain the above
8    * copyright notice, this list of conditions and the following
9    * disclaimer. 2) Redistributions in binary form must reproduce the above
10   * copyright notice, this list of conditions and the following
11   * disclaimer in the documentation and/or other materials provided
12   * with the distribution. 3) Neither the name of the stateful.co nor
13   * the names of its contributors may be used to endorse or promote
14   * products derived from this software without specific prior written
15   * permission.
16   *
17   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
19   * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20   * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21   * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
22   * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
28   * OF THE POSSIBILITY OF SUCH DAMAGE.
29   */
30  package co.stateful.spi;
31  
32  import com.jcabi.aspects.Immutable;
33  import java.io.IOException;
34  
35  /**
36   * Counters.
37   *
38   * @author Yegor Bugayenko (yegor@tpc2.com)
39   * @version $Id$
40   */
41  @Immutable
42  public interface Counters {
43  
44      /**
45       * Maximum allowed per account.
46       */
47      int MAX = 64;
48  
49      /**
50       * Get list of them all.
51       * @return List of counter names
52       * @throws IOException If fails
53       */
54      Iterable<String> names() throws IOException;
55  
56      /**
57       * Create a counter.
58       * @param name Name of it
59       * @throws IOException If fails due to IO problem
60       */
61      void create(String name) throws IOException;
62  
63      /**
64       * Delete a counter.
65       * @param name Name of it
66       * @throws IOException If fails
67       */
68      void delete(String name) throws IOException;
69  
70      /**
71       * Get one counter by name.
72       * @param name Name of it
73       * @return Counter
74       */
75      Counter get(String name);
76  
77  }