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TiddlyWiki5/editions/dev/tiddlers/from Heigele and Jurke/Extended Persistence.tid

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chapter.of: TiddlyWiki Core Application
created: 20140715184132652
modified: 20140717181151719
sub.num: 3
tags: doc
title: Extended Persistence
The microkernel only contains a bare store and some deserializers to load tiddlers from JSON files or from the DOM of the current HTML file.
The core plug-in adds some more deserializers and a new mechanism for persisting and synchronising tiddlers.
This mechanism is provided as a global module in [[$:/core/modules/syncer.js]].
The saver module has three responsibilities:
# Save the whole wiki.
# Provide the ability to download single tiddlers as files.
# Synchronise the local wiki store with a remote wiki store, i.e. running in Node.js
The syncer module is connected mainly to two other modules.
For one it registers to changes at the wiki store ([[Event Mechanism]]) and if any changes occur they are synced to the remote store.
Then it provides a function ``saveWiki(options)``. This function can be used by other modules. For example the [[RootWidget|RootWidget and Rendering Startup]] uses this function to save the whole wiki or start downloading single tiddlers.
The syncer itself does not provide a concrete implementation of saving, downloading or syncing the tiddlers.
Instead it loads modules of type ``saver`` and ``syncadaptor`` and manages the saving/syncing process.
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