Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
Throughput |
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| 1.0;1 |
1 | /** | |
2 | * Copyright (c) 2012-2016, jcabi.com | |
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 jcabi.com 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 com.jcabi.dynamo; | |
31 | ||
32 | import com.amazonaws.services.dynamodbv2.model.ProvisionedThroughput; | |
33 | import com.jcabi.aspects.Tv; | |
34 | ||
35 | /** | |
36 | * Throughput of a table. | |
37 | * @author Georgy Vlasov (wlasowegor@gmail.com) | |
38 | * @version $Id: 4cab6bdfd2bd16158773c093c767cc931023f554 $ | |
39 | * @since 0.18.4 | |
40 | */ | |
41 | public final class Throughput { | |
42 | /** | |
43 | * Table. | |
44 | */ | |
45 | private final transient Table table; | |
46 | ||
47 | /** | |
48 | * Public ctor. | |
49 | * @param tbl The table. | |
50 | */ | |
51 | 1 | public Throughput(final Table tbl) { |
52 | 1 | this.table = tbl; |
53 | 1 | } |
54 | ||
55 | /** | |
56 | * Adjusts throughput on the table. | |
57 | */ | |
58 | public void adjust() { | |
59 | 1 | this.table |
60 | .region() | |
61 | .aws() | |
62 | .updateTable( | |
63 | this.table.name(), | |
64 | Throughput.suitableThroughput() | |
65 | ); | |
66 | 1 | } |
67 | ||
68 | /** | |
69 | * Decides which throughput value is the most suitable according to | |
70 | * certain parameters of elasticity/scalability. | |
71 | * @return Throughput settings. | |
72 | * @todo #10 The exact algorithm for figuring out read and write | |
73 | * capacities should be based on a CloudWatch metric accessed with | |
74 | * credentials of this.table.region().aws(). | |
75 | */ | |
76 | private static ProvisionedThroughput suitableThroughput() { | |
77 | 1 | return new ProvisionedThroughput( |
78 | (long) Tv.HUNDRED, | |
79 | (long) Tv.HUNDRED | |
80 | ); | |
81 | } | |
82 | } |