https://wiki.mementodatabase.com/index.php?title=About:MementoStructure&feed=atom&action=historyAbout:MementoStructure - Revision history2024-03-29T08:55:30ZRevision history for this page on the wikiMediaWiki 1.39.2https://wiki.mementodatabase.com/index.php?title=About:MementoStructure&diff=4158&oldid=prevUnConnoisseur at 17:24, 21 February 20222022-02-21T17:24:04Z<p></p>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Like almost all modern apps, Memento is structured inside into 3 layers or tiers.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Like almost all modern apps, Memento is structured inside into 3 layers or tiers.</div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To read further about Memento's structure read [[About:MementoStructure|here]].</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>To read further about Memento's structure read [[About:MementoStructure|here]].</div></td></tr>
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</table>UnConnoisseurhttps://wiki.mementodatabase.com/index.php?title=About:MementoStructure&diff=4136&oldid=prevUnConnoisseur at 02:00, 18 February 20222022-02-18T02:00:10Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 19:00, 17 February 2022</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The Memento ''Scripting'' layer runs on your device and may be call in articles the ''Application'' or ''Logic'' tier or layer.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The Memento ''Scripting'' layer runs on your device and may be call in articles the ''Application'' or ''Logic'' tier or layer.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The Memento ''Database'' layer runs on your device & on Memento servers when you're using the cloud and may be called in articles the ''Data'' tier or layer.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The Memento ''Database'' layer runs on your device & on Memento servers when you're using the cloud and may be called in articles the ''Data'' tier or layer.</div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">=== The Memento application structure ===</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">You generally don't have to concern yourself about Memento's structure. It takes care of everything for you. However, it is important that you know where in the wiki, in Help, or in online or other computer literature to read about the various layers & parts of Memento. So. we'll start with the bottom line, the ''simplified summary'', because if you choose to read about this, we'll have you in ''tiers'' (ha) &mdash; as in the ''tiers'' of a ''3-tier application architecture''. Seriously, the subject is large, but it nevertheless boils down to what's in the following paragraph.</ins></div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">;Simplified summary: The Memento application has a 3-''layer'' structure (effectively the same as a 3-''tier'' architecture, which matters because it is how you'll read about it in literature on the subject) that almost entirely runs on your device. In the Memento wiki, we call them...</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*The ''user interface'' layer, which is what you see on the screen & interact with using your fingers or a keyboard & mouse</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*The ''scripting'' layer, running on your device and providing the programming logic to handle the data as you want</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*The ''database'' layer, running mostly on your device & handled without bothering you when your data in the cloud needs to be accessed</ins></div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">To read further about Memento's structure read [[About:MementoStructure|here]].</ins></div></td></tr>
</table>UnConnoisseurhttps://wiki.mementodatabase.com/index.php?title=About:MementoStructure&diff=4131&oldid=prevUnConnoisseur at 14:35, 17 February 20222022-02-17T14:35:33Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 07:35, 17 February 2022</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Like almost all modern apps, Memento is structured inside into 3 layers or tiers.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Like almost all modern apps, Memento is structured inside into 3 layers or tiers.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The '''''<u>User Interface</u> <del style="font-weight: bold; text-decoration: none;">tier</del>''''' (the '''<u>UI</u>''') <del style="font-weight: bold; text-decoration: none;">&mdash; more properly called the '''''Presentation tier'''''. The UI </del>consists of &mdash; on the Mobile edition screens & on the Desktop edition windows &mdash; in either edition with cards (forms), menus, toolbars, buttons, and so on &mdash; to handle interaction with the user.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The '''''<u>User Interface</u> <ins style="font-weight: bold; text-decoration: none;">layer</ins>''''' (the '''<u>UI</u> <ins style="font-weight: bold; text-decoration: none;">layer</ins>''') consists of &mdash; on the Mobile edition screens & on the Desktop edition windows &mdash; in either edition with cards (forms), menus, toolbars, buttons, and so on &mdash; to handle interaction with the user.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The '''''<u>Scripting</u> <del style="font-weight: bold; text-decoration: none;">tier</del>''''' <del style="font-weight: bold; text-decoration: none;">&mdash; though more properly called the '''''Application tier''''', </del>takes action upon user input or other such events, like the opening of a library, the pushing of a button, or the saving of an entry. These events may be handled to some degree by Memento & to another degree by the use of user-written '''''scripts'''''<del style="font-weight: bold; text-decoration: none;">, </del>generally JavaScript scripts.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The '''''<u>Scripting</u> <ins style="font-weight: bold; text-decoration: none;">layer</ins>''''' takes action upon user input or other such events, like the opening of a library, the pushing of a button, or the saving of an entry. These events may be handled to some degree by Memento & to another degree by the use of user-written '''''scripts'''''<ins style="font-weight: bold; text-decoration: none;">(</ins>generally JavaScript scripts<ins style="font-weight: bold; text-decoration: none;">)</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The '''''<u>Database</u> <del style="font-weight: bold; text-decoration: none;">tier</del>''''' <del style="font-weight: bold; text-decoration: none;">&mdash; most commonly called the '''''Data tier''''' &mdash; </del>manages the ''storage of & access to data''.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The '''''<u>Database</u> <ins style="font-weight: bold; text-decoration: none;">layer</ins>''''' manages the ''storage of & access to data'' <ins style="font-weight: bold; text-decoration: none;">(or database)</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>:This <del style="font-weight: bold; text-decoration: none;">tier </del>includes the definitions of all libraries, fields (with any aggregations or autofills), entries, links among or relationships between libraries, templates, & filters; it also includes synchronization of local data with data in the Memento cloud &mdash; the <u>partial</u> synchronization of each library with Google Sheets &mdash; which can then be saved to Microsoft Excel files.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>:This <ins style="font-weight: bold; text-decoration: none;">layer </ins>includes the definitions of all libraries, fields (with any aggregations or autofills), entries, links among or relationships between libraries, templates, & filters; it also includes synchronization of local data with data in the Memento cloud &mdash; the <u>partial</u> synchronization of each library with Google Sheets &mdash; which can then be saved to Microsoft Excel files.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>:<u>'''This'''</u> synchronization with spreadsheets in Google Drive &mdash; as opposed to that with libraries in the ''Memento cloud'' &mdash; <u>does not include</u> library links, tag names in Tags fields, item names in Single-Choice List, Radio Buttons, Multiple-Choice List, Checkboxes, nor List fields.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>:<u>'''This'''</u> synchronization with spreadsheets in Google Drive &mdash; as opposed to that with libraries in the ''Memento cloud'' &mdash; <u>does not include</u> library links, tag names in Tags fields, item names in Single-Choice List, Radio Buttons, Multiple-Choice List, Checkboxes, nor List fields.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Read about [[About:LayersVsTiers|the relationship between ''layers'' and ''tiers'']].</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">{{BeginNote|Layers & Tiers}}</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Move the text below into [[About:MementoStructure]], revising along the way for user comprehensibility.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">We may also put some of this into [[Doc:TermConfusion]], probably just a tiny summary of it.</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>----------</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>----------</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The architecture of most modern applications is made up of 3 execution ''tiers'': The Presentation tier, the Application tier, and the Data tier.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The architecture of most modern applications is made up of 3 execution ''tiers'': The Presentation tier, the Application tier, and the Data tier.</div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==== Memento terminology in 3-tier application architecture ====</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==== Memento terminology in 3-tier application architecture ====</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>;Tiers & layers: Most articles & other literature on application architecture reference 3-''tier'' architecture. These articles have been written for very large systems, like Google or Amazon. Each of the 3 ''layers'' will run on its own separate platform on such large-scale systems, so they call it a 3-tier architecture. Very small systems that run, say, on your cellphone will have all 3 layers running on your cellphone. So, don't worry about the difference between application layers & tiers. In our case, the only time a layer gets spread across tiers is with the Memento Cloud. There is still a part of the data layer running on your phone, but it communications with the Memento server software in the cloud for the remainder of the data layer. So other than that, they are equivalent, and when you hear about one, it applies also to the other unless the subject has to do with what device or computer it runs on. Since we're small, '''we'll use the term ''layer'''''.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>;Tiers & layers: Most articles & other literature on application architecture reference 3-''tier'' architecture.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>These articles have been written for very large systems, like Google or Amazon.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Each of the 3 ''layers'' will run on its own separate platform on such large-scale systems, so they call it a 3-tier architecture. </div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Very small systems that run, say, on your cellphone will have all 3 layers running on your cellphone.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>So, don't worry about the difference between application layers & tiers.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>In our case, the only time a layer gets spread across tiers is with the Memento Cloud.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>There is still a part of the data layer running on your phone, but it communications with the Memento server software in the cloud for the remainder of the data layer.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>So other than that, they are equivalent, and when you hear about one, it applies also to the other unless the subject has to do with what device or computer it runs on.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Since we're small, '''we'll use the term ''layer'''''.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>;Memento's names for the tiers/layers: The Memento ''user interface'' layer runs on your device and may be called in articles the ''Preseentation'' tier or layer. The Memento ''Scripting'' layer runs on your device and may be call in articles the ''Application'' or ''Logic'' tier or layer. The Memento ''Database'' layer runs on your device & on Memento servers when you're using the cloud and may be called in articles the ''Data'' tier or layer.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>;Memento's names for the tiers/layers:</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The Memento ''user interface'' layer runs on your device and may be called in articles the ''Preseentation'' tier or layer.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The Memento ''Scripting'' layer runs on your device and may be call in articles the ''Application'' or ''Logic'' tier or layer.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The Memento ''Database'' layer runs on your device & on Memento servers when you're using the cloud and may be called in articles the ''Data'' tier or layer.</div></td></tr>
</table>UnConnoisseurhttps://wiki.mementodatabase.com/index.php?title=About:MementoStructure&diff=4116&oldid=prevUnConnoisseur: Created page with "= Memento application structure = Like almost all modern apps, Memento is structured inside into 3 layers or tiers. The '''''<u>User Interface</u> tier''''' (the '''<u>UI</u>..."2022-02-15T13:11:34Z<p>Created page with "= Memento application structure = Like almost all modern apps, Memento is structured inside into 3 layers or tiers. The '''''<u>User Interface</u> tier''''' (the '''<u>UI</u>..."</p>
<p><b>New page</b></p><div>= Memento application structure =<br />
Like almost all modern apps, Memento is structured inside into 3 layers or tiers.<br />
<br />
The '''''<u>User Interface</u> tier''''' (the '''<u>UI</u>''') &mdash; more properly called the '''''Presentation tier'''''. The UI consists of &mdash; on the Mobile edition screens & on the Desktop edition windows &mdash; in either edition with cards (forms), menus, toolbars, buttons, and so on &mdash; to handle interaction with the user.<br />
<br />
The '''''<u>Scripting</u> tier''''' &mdash; though more properly called the '''''Application tier''''', takes action upon user input or other such events, like the opening of a library, the pushing of a button, or the saving of an entry. These events may be handled to some degree by Memento & to another degree by the use of user-written '''''scripts''''', generally JavaScript scripts.<br />
<br />
The '''''<u>Database</u> tier''''' &mdash; most commonly called the '''''Data tier''''' &mdash; manages the ''storage of & access to data''.<br />
<br />
:This tier includes the definitions of all libraries, fields (with any aggregations or autofills), entries, links among or relationships between libraries, templates, & filters; it also includes synchronization of local data with data in the Memento cloud &mdash; the <u>partial</u> synchronization of each library with Google Sheets &mdash; which can then be saved to Microsoft Excel files.<br />
<br />
:<u>'''This'''</u> synchronization with spreadsheets in Google Drive &mdash; as opposed to that with libraries in the ''Memento cloud'' &mdash; <u>does not include</u> library links, tag names in Tags fields, item names in Single-Choice List, Radio Buttons, Multiple-Choice List, Checkboxes, nor List fields.<br />
----------<br />
The architecture of most modern applications is made up of 3 execution ''tiers'': The Presentation tier, the Application tier, and the Data tier.<br />
<br/>See IBM's definitive article: [https://www.ibm.com/cloud/learn/three-tier-architecture '''Three-Tier Architecture'''].<br />
<br/>See a BMC Software (a vendor of several sets of applications & services for large-scale computer database systems) blog article called [https://www.bmc.com/blogs/n-tier-architecture-tier-2-tier-3-and-multi-tier-explained/'''N-Tier Architecture: Tier 2, Tier 3, and Multi-Tier Explained'''] blog article on database application architecture.<br />
<br />
==== Memento terminology in 3-tier application architecture ====<br />
;Tiers & layers: Most articles & other literature on application architecture reference 3-''tier'' architecture. These articles have been written for very large systems, like Google or Amazon. Each of the 3 ''layers'' will run on its own separate platform on such large-scale systems, so they call it a 3-tier architecture. Very small systems that run, say, on your cellphone will have all 3 layers running on your cellphone. So, don't worry about the difference between application layers & tiers. In our case, the only time a layer gets spread across tiers is with the Memento Cloud. There is still a part of the data layer running on your phone, but it communications with the Memento server software in the cloud for the remainder of the data layer. So other than that, they are equivalent, and when you hear about one, it applies also to the other unless the subject has to do with what device or computer it runs on. Since we're small, '''we'll use the term ''layer'''''.<br />
<br />
;Memento's names for the tiers/layers: The Memento ''user interface'' layer runs on your device and may be called in articles the ''Preseentation'' tier or layer. The Memento ''Scripting'' layer runs on your device and may be call in articles the ''Application'' or ''Logic'' tier or layer. The Memento ''Database'' layer runs on your device & on Memento servers when you're using the cloud and may be called in articles the ''Data'' tier or layer.</div>UnConnoisseur