Mercurial > hg > Papers > 2014 > nobuyasu-master

annotate paper/chapter2.tex @ 5:a6aa6af4b80f

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added some figures
author Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date Sun, 12 Jan 2014 01:33:05 +0900
parents d42d2acf5d1d
children f47f11ea0e28
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4
d42d2acf5d1d Added some tex files
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
1 \chapter{木構造データベースJungleの分散設計}
d42d2acf5d1d Added some tex files
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
2 \section{木構造データベースJungle}
5
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
3 Jungle はスケーラビリティのある CMS の開発を目指して当研究室で開発されている非破壊的木構造データベースである.
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
4 一般的なコンテンツマネジメントシステムではブログツールや Wiki・SNS が多く, これらの
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
5 ウェブサイトの構造は大体が木構造であるため, データ構造として木構造を採用している.
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
6
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
7 ここではまず破壊的木構造と, 非破壊的木構造の説明をし, Jungle におけるデータ編集の実装について述べる.
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
8 \section{破壊的木構造}
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
9 破壊的木構造の編集は, 木構造で保持しているデータを直接書き換えることで行う.
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
10 図\ref{fig:destractive}は破壊的木構造の編集を表している.
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
11
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
12 \begin{figure}[htpb]
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
13 \begin{center}
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
14 \includegraphics[scale=0.8]{figures/destructive_tree.pdf}
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
15 \caption{破壊的木構造の編集}
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
16 \label{fig:destractive}
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
17 \end{center}
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
18 \end{figure}
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
19
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
20 破壊的木構造は, 編集を行う際に木のロックを掛ける必要がある.
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
21 この時, データを受け取ろうと木を走査するスレッドは書き換えの終了を待つ必要があり, 閲覧者が
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
22 いる場合は木の走査が終わるまで書き換えをまたなければならない.
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
23 これではロックによりスケーラビリティが損なわれてしまう.
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
24
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
25 \section{非破壊的木構造}
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
26 非破壊的木構造は破壊的木構造とは違い, 一度作成した木を破壊することはない.
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
27 非破壊的木構造においてデータの編集は, ルートから編集を行うノードまでコピーを
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
28 行い新しく木構造を作成することで行われる.
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
29 編集がない部分に対しては参照を持たせる.
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
30
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
31 \begin{figure}[htpb]
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
32 \begin{center}
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
33 \includegraphics[scale=0.8]{figures/non_destructive_tree.pdf}
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
34 \caption{非破壊的木構造の編集}
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
35 \label{fig:nondestractive}
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
36 \end{center}
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
37 \end{figure}
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
38
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
39 非破壊的木構造により, 木構造を編集しながら走査することが可能となる.
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
40
4
d42d2acf5d1d Added some tex files
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
41 \section{Jungleの分散データベース設計}
5
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
42
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
43
a6aa6af4b80f Added some figures
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents: 4
diff changeset
44
4
d42d2acf5d1d Added some tex files
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
45 \section{Jungleの永続性の設計}
d42d2acf5d1d Added some tex files
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
46