| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
| Throughput |
|
| 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 | } |