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(part of) documentation in sphinx format

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docs/sphinx/source/authors.rst 0 → 100644
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Authors
=======
* Francois Billioud
* Tristan Cavelier
* Sven Franck
docs/sphinx/source/available_storages.rst 0 → 100644
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.. role:: js(code)
:language: javascript
.. _list-of-available-storages:
List of Available Storages
==========================
JIO save his job queue in a workspace which is localStorage by default.
Provided storage descirption are also stored, and it can be dangerous if we
store passwords.
The best way to create a storage description is to use the (often) provided
tool given by the storage library. The returned description is secured to avoid
clear readable password. (enciphered password for instance)
When building storage trees, there is no limit on the number of storages you
can use. The only thing you have to be aware of is compatability of simple and
revision based storages.
Connectors
----------
LocalStorage
^^^^^^^^^^^^
Three methods are provided:
* :js:`createDescription(username, [application_name], [mode="localStorage"])`
* :js:`createLocalDescription(username, [application_name])`
* :js:`createMemoryDescription(username, [application_name])`
All parameters are strings.
Examples:
.. code-block:: javascript
// to work on browser localStorage
var jio = jIO.createJIO(local_storage.createDescription("me"));
// to work on browser memory
var jio = jIO.createJIO(local_storage.createMemoryDescription("me"));
DavStorage
^^^^^^^^^^
The tool dav_storage.createDescription generates a dav storage description for
*no*, *basic* or *digest* authentication (*digest* is not implemented yet).
.. code-block:: javascript
dav_storage.createDescription(url, auth_type, [realm], [username], [password]);
All parameters are strings.
Only ``url`` and ``auth_type`` are required. If ``auth_type`` is equal to "none",
then ``realm``, ``username`` and ``password`` are useless. ``username`` and ``password`` become
required if ``auth_type`` is equal to "basic". And ``realm`` also becomes required if
``auth_type`` is equal to "digest".
digest **is not implemented yet**
**Be careful**: The generated description never contains readable password, but
for basic authentication, the password will just be base64 encoded.
S3Storage
^^^^^^^^^
Updating to v2.0
XWikiStorage
^^^^^^^^^^^^
Updating to v2.0
Handlers
--------
IndexStorage
^^^^^^^^^^^^
This handler indexes documents metadata into a database (which is a simple
document) to increase the speed of allDocs requests. However, it is not able to
manage the ``include_docs`` option.
The sub storages have to manage ``query`` and ``include_docs`` options.
Here is the description:
.. code-block:: javascript
{
"type": "index",
"indices": [{
"id": "index_title_subject.json", // doc id where to store indices
"index": ["title", "subject"], // metadata to index
"attachment": "db.json", // default "body"
"metadata": { // additional metadata to add to database, default undefined
"type": "Dataset",
"format": "application/json",
"title": "My index database",
"creator": "Me"
},
"sub_storage": <sub storage where to store index>
// default equal to parent sub_storage field
}, {
"id": "index_year.json",
"index": "year"
...
}],
"sub_storage": <sub storage description>
}
GIDStorage
^^^^^^^^^^
`Full description here <http://www.j-io.org/P-JIO-GIDStorage>`_.
Updating to v2.0
SplitStorage
^^^^^^^^^^^^
Updating to v2.0
Replicate Storage
^^^^^^^^^^^^^^^^^
Comming soon
Revision Based Handlers
-----------------------
A revision based handler is a storage which is able to do some document
versionning using simple storages listed above.
On JIO command parameter, ``_id`` is still used to identify a document, but
another id ``_rev`` must be defined to use a specific revision of this document.
On command responses, you will find another field ``rev`` which will represent the
new revision produced by your action. All the document history is kept unless
you decide to delete older revisions.
Another fields ``conflicts``, ``revisions`` and ``revs_info`` can be returned if the
options **conflicts: true**, **revs: true** and **revs_info: true** are set.
Revision Storage
^^^^^^^^^^^^^^^^
Updating to v2.0
Replicate Revision Storage
^^^^^^^^^^^^^^^^^^^^^^^^^^
Updating to v2.0
docs/sphinx/source/complex_queries.rst 0 → 100644
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JIO Complex Queries
===================
What are Complex Queries?
-------------------------
In jIO, a complex query can tell a storage server to select, filter, sort, or
limit a document list before sending it back. If the server is not able to do
so, the complex query tool can act on the retreived list by itself. Only the
allDocs method can use complex queries.
A query can either be a string (using a specific language useful for writing
queries), or it can be a tree of objects (useful to browse queries). To handle
complex queries, jIO uses a parsed grammar file which is complied using `JSCC <http://jscc.phorward-software.com/>`_.
Why use Complex Queries?
------------------------
Complex queries can be used similar to database queries. So they are useful to:
* search a specific document
* sort a list of documents in a certain order
* avoid retreiving a list of ten thousand documents
* limit the list to show only xy documents by page
For some storages (like localStorage), complex queries can be a powerful tool
to query accessible documents. When querying documents on a distant storage,
some server-side logic should be run to avoid having to request large amount of
documents to run a query on the client. If distant storages are static, an
alternative would be to use an indexStorage with appropriate indices as complex
queries will always try to run the query on the index before querying documents
itself.
How to use Complex Queries with jIO?
------------------------------------
Complex queries can be triggered by including the option named query in the allDocs method call. An example would be:
.. code-block:: javascript
var options = {};
// search text query
options['query'] = '(creator:"John Doe") AND (format:"pdf")';
// OR query tree
options['query'] = {
type:'complex',
operator:'AND',
query_list: [{
"type": "simple",
"key": "creator",
"value": "John Doe"
}, {
"type": "simple",
"key": "format",
"value": "pdf"
}]
};
// FULL example using filtering criteria
options = {
query: '(creator:"% Doe") AND (format:"pdf")',
limit: [0, 100],
sort_on: [['last_modified', 'descending'], ['creation_date', 'descending']],
select_list: ['title'],
wildcard_character: '%'
};
// execution
jio_instance.allDocs(options, callback);
How to use Complex Queries outside jIO?
---------------------------------------
Complex Queries provides an API - which namespace is complex_queries. Please
also refer to the `Complex Queries sample page <http://git.erp5.org/gitweb/jio.git/blob/HEAD:/examples/complex_example.html?js=1>`_
on how to use these methods in- and outside jIO. The module provides:
.. code-block:: javascript
{
parseStringToObject: [Function: parseStringToObject],
stringEscapeRegexpCharacters: [Function: stringEscapeRegexpCharacters],
select: [Function: select],
sortOn: [Function: sortOn],
limit: [Function: limit],
convertStringToRegExp: [Function: convertStringToRegExp],
QueryFactory: { [Function: QueryFactory] create: [Function] },
Query: [Function: Query],
SimpleQuery: { [Function: SimpleQuery] super_: [Function: Query] },
ComplexQuery: { [Function: ComplexQuery] super_: [Function: Query] }
}
(Reference API coming soon.)
Basic example:
.. code-block:: javascript
// object list (generated from documents in storage or index)
var object_list = [
{"title": "Document number 1", "creator": "John Doe"},
{"title": "Document number 2", "creator": "James Bond"}
];
// the query to run
var query = 'title: "Document number 1"';
// running the query
var result = complex_queries.QueryFactory.create(query).exec(object_list);
// console.log(result);
// [ { "title": "Document number 1", "creator": "John Doe"} ]
Other example:
.. code-block:: javascript
var result = complex_queries.QueryFactory.create(query).exec(
object_list,
{
"select": ['title', 'year'],
"limit": [20, 20], // from 20th to 40th document
"sort_on": [['title', 'ascending'], ['year', 'descending']],
"other_keys_and_values": "are_ignored"
}
);
// this case is equal to:
var result = complex_queries.QueryFactory.create(query).exec(object_list);
complex_queries.sortOn([['title', 'ascending'], ['year', 'descending']], result);
complex_queries.limit([20, 20], result);
complex_queries.select(['title', 'year'], result);
Complex Queries in storage connectors
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The query exec method must only be used if the server is not able to pre-select
documents. As mentioned before, you could use an indexStorage to maintain
indices with key information on all documents in a storage. This index file
will then be used to run queries on if all fields, required in the query answer
are available in the index.
Matching properties
^^^^^^^^^^^^^^^^^^^
Complex Queries select items which exactly match with the value given in the
query. You can use wildcards ('%' is the default wildcard character), and you
can change the wildcard character in the query options object. If you don't
want to use a wildcard, just set the wildcard character to an empty string.
.. code-block:: javascript
var query = {
"query": 'creator:"* Doe"',
"wildcard_character": "*"
};
Should default search types be defined in jIO or in user interface components?
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Default search types should be defined in the application's user interface
components because criteria like filters will be changed frequently by the
component (change ``limit: [0, 10]`` to ``limit: [10, 10]`` or ``sort_on: [['title',
'ascending']]`` to ``sort_on: [['creator', 'ascending']]``) and each component must
have their own default properties to keep their own behavior.
Convert Complex Queries into another type
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Example, convert Query object into human readable string:
.. code-block:: javascript
var query = complex_queries.QueryFactory.create('year: < 2000 OR title: "*a"'),
option = {
"wildcard_character": "*",
"limit": [0, 10]
},
human_read = {
"<": "is lower than ",
"<=": "is lower or equal than ",
">": "is greater than ",
">=": "is greater or equal than ",
"=": "matches ",
"!=": "doesn't match "
};
query.onParseStart = function (object, option) {
object.start = "The wildcard character is '" +
(option.wildcard_character || "%") +
"' and we need only the " + option.limit[1] + " elements from the numero " +
option.limit[0] + ". ";
};
query.onParseSimpleQuery = function (object, option) {
object.parsed = object.parsed.key + " " + human_read[object.parsed.operator] +
object.parsed.value;
};
query.onParseComplexQuery = function (object, option) {
object.parsed = "I want all document where " +
object.parsed.query_list.join(" " + object.parsed.operator.toLowerCase() +
" ") + ". ";
};
query.onParseEnd = function (object, option) {
object.parsed = object.start + object.parsed + "Thank you!";
};
console.log(query.parse(option));
// logged: "The wildcard character is '*' and we need only the 10 elements
// from the numero 0. I want all document where year is lower than 2000 or title
// matches *a. Thank you!"
JSON Schemas and Grammar
------------------------
Below you can find schemas for constructing complex queries
* `Complex Queries JSON Schema <http://www.j-io.org/jio-Complex.Queries.JSON.Schema>`_
* `Simple Queries JSON Schema <http://www.j-io.org/jio-Simple.Queries.JSON.Schema>`_
* `Complex Queries Grammar <http://www.j-io.org/jio-Complex.Queries.Grammar>`_
docs/sphinx/source/conf.py 0 → 100644
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# -*- coding: utf-8 -*-
#
# JIO documentation build configuration file, created by
# sphinx-quickstart on Fri Nov 15 11:55:08 2013.
#
# This file is execfile()d with the current directory set to its containing dir.
#
# Note that not all possible configuration values are present in this
# autogenerated file.
#
# All configuration values have a default; values that are commented out
# serve to show the default.
import sys, os
#highlight_language = 'javascript'
# If extensions (or modules to document with autodoc) are in another directory,
# add these directories to sys.path here. If the directory is relative to the
# documentation root, use os.path.abspath to make it absolute, like shown here.
#sys.path.insert(0, os.path.abspath('.'))
# -- General configuration -----------------------------------------------------
# If your documentation needs a minimal Sphinx version, state it here.
#needs_sphinx = '1.0'
# Add any Sphinx extension module names here, as strings. They can be extensions
# coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
extensions = ['sphinx.ext.todo', 'sphinx.ext.ifconfig']
# Add any paths that contain templates here, relative to this directory.
templates_path = ['_templates']
# The suffix of source filenames.
source_suffix = '.rst'
# The encoding of source files.
#source_encoding = 'utf-8-sig'
# The master toctree document.
master_doc = 'index'
# General information about the project.
project = u'JIO'
copyright = u'2013, Nexedi'
# The version info for the project you're documenting, acts as replacement for
# |version| and |release|, also used in various other places throughout the
# built documents.
#
# The short X.Y version.
version = '2.0.0'
# The full version, including alpha/beta/rc tags.
release = '2.0.0'
# The language for content autogenerated by Sphinx. Refer to documentation
# for a list of supported languages.
#language = None
# There are two options for replacing |today|: either, you set today to some
# non-false value, then it is used:
#today = ''
# Else, today_fmt is used as the format for a strftime call.
#today_fmt = '%B %d, %Y'
# List of patterns, relative to source directory, that match files and
# directories to ignore when looking for source files.
exclude_patterns = []
# The reST default role (used for this markup: `text`) to use for all documents.
#default_role = None
# If true, '()' will be appended to :func: etc. cross-reference text.
#add_function_parentheses = True
# If true, the current module name will be prepended to all description
# unit titles (such as .. function::).
#add_module_names = True
# If true, sectionauthor and moduleauthor directives will be shown in the
# output. They are ignored by default.
#show_authors = False
# The name of the Pygments (syntax highlighting) style to use.
#pygments_style = 'sphinx'
pygments_style = 'manni'
# A list of ignored prefixes for module index sorting.
#modindex_common_prefix = []
# -- Options for HTML output ---------------------------------------------------
# The theme to use for HTML and HTML Help pages. See the documentation for
# a list of builtin themes.
html_theme = 'default'
# Theme options are theme-specific and customize the look and feel of a theme
# further. For a list of options available for each theme, see the
# documentation.
#html_theme_options = {}
# Add any paths that contain custom themes here, relative to this directory.
#html_theme_path = []
# The name for this set of Sphinx documents. If None, it defaults to
# "<project> v<release> documentation".
#html_title = None
# A shorter title for the navigation bar. Default is the same as html_title.
#html_short_title = None
# The name of an image file (relative to this directory) to place at the top
# of the sidebar.
html_logo = 'jio.png'
# The name of an image file (within the static path) to use as favicon of the
# docs. This file should be a Windows icon file (.ico) being 16x16 or 32x32
# pixels large.
#html_favicon = None
# Add any paths that contain custom static files (such as style sheets) here,
# relative to this directory. They are copied after the builtin static files,
# so a file named "default.css" will overwrite the builtin "default.css".
html_static_path = ['_static']
# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
# using the given strftime format.
#html_last_updated_fmt = '%b %d, %Y'
# If true, SmartyPants will be used to convert quotes and dashes to
# typographically correct entities.
#html_use_smartypants = True
# Custom sidebar templates, maps document names to template names.
#html_sidebars = {}
# Additional templates that should be rendered to pages, maps page names to
# template names.
#html_additional_pages = {}
# If false, no module index is generated.
#html_domain_indices = True
# If false, no index is generated.
#html_use_index = True
# If true, the index is split into individual pages for each letter.
#html_split_index = False
# If true, links to the reST sources are added to the pages.
#html_show_sourcelink = True
# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
#html_show_sphinx = True
# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
#html_show_copyright = True
# If true, an OpenSearch description file will be output, and all pages will
# contain a <link> tag referring to it. The value of this option must be the
# base URL from which the finished HTML is served.
#html_use_opensearch = ''
# This is the file name suffix for HTML files (e.g. ".xhtml").
#html_file_suffix = None
# Output file base name for HTML help builder.
htmlhelp_basename = 'JIOdoc'
# -- Options for LaTeX output --------------------------------------------------
latex_elements = {
# The paper size ('letterpaper' or 'a4paper').
#'papersize': 'letterpaper',
# The font size ('10pt', '11pt' or '12pt').
#'pointsize': '10pt',
# Additional stuff for the LaTeX preamble.
#'preamble': '',
}
# Grouping the document tree into LaTeX files. List of tuples
# (source start file, target name, title, author, documentclass [howto/manual]).
latex_documents = [
('index', 'JIO.tex', u'JIO Documentation',
u'Nexedi', 'manual'),
]
# The name of an image file (relative to this directory) to place at the top of
# the title page.
#latex_logo = None
# For "manual" documents, if this is true, then toplevel headings are parts,
# not chapters.
#latex_use_parts = False
# If true, show page references after internal links.
#latex_show_pagerefs = False
# If true, show URL addresses after external links.
#latex_show_urls = False
# Documents to append as an appendix to all manuals.
#latex_appendices = []
# If false, no module index is generated.
#latex_domain_indices = True
# -- Options for manual page output --------------------------------------------
# One entry per manual page. List of tuples
# (source start file, name, description, authors, manual section).
man_pages = [
('index', 'jio', u'JIO Documentation',
[u'Nexedi'], 1)
]
# If true, show URL addresses after external links.
#man_show_urls = False
# -- Options for Texinfo output ------------------------------------------------
# Grouping the document tree into Texinfo files. List of tuples
# (source start file, target name, title, author,
# dir menu entry, description, category)
texinfo_documents = [
('index', 'JIO', u'JIO Documentation',
u'Nexedi', 'JIO', 'One line description of project.',
'Miscellaneous'),
]
# Documents to append as an appendix to all manuals.
#texinfo_appendices = []
# If false, no module index is generated.
#texinfo_domain_indices = True
# How to display URL addresses: 'footnote', 'no', or 'inline'.
#texinfo_show_urls = 'footnote'
docs/sphinx/source/developers.rst 0 → 100644
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For developers
==============
Quick start
-----------
To get started with jIO, clone one of the repositories link in `Download & Fork <https://www.j-io.org/download-and-fork>`_ tab.
To build your library you have to:
* Install `NodeJS <http://nodejs.org/>`_ (including NPM)
* Install Grunt command line with npm. ``# npm -g install grunt-cli``
* Install dev dependencies. ``$ npm install``
* Compile JS/CC parser. ``$ make`` (until we found how to compile it with grunt)
* And run build. ``$ grunt``
The repository also includes the built ready-to-use files, so in case you do
not want to build jIO yourself, just use *jio.js* as well as *complex_queries.js*
plus the storages and dependencies you need and you will be good to go.
Naming Conventions
------------------
All the code follows this `Javascript Naming Conventions <http://www.j-io.org/Javascript-Naming_Conventions>`_.
How to design your own jIO Storage Library
------------------------------------------
Create a constructor:
.. code-block:: javascript
function MyStorage(storage_description) {
this._value = storage_description.value;
if (typeof this._value !== 'string') {
throw new TypeError("'value' description property is not a string");
}
}
Create 10 methods: ``post``, ``put``, ``putAttachment``, ``get``, ``getAttachment``,
``remove``, ``removeAttachment``, ``allDocs``, ``check`` and ``repair``.
.. code-block:: javascript
MyStorage.prototype.post = function (command, metadata, option) {
var document_id = metadata._id;
// [...]
};
MyStorage.prototype.get = function (command, param, option) {
var document_id = param._id;
// [...]
};
MyStorage.prototype.putAttachment = function (command, param, option) {
var document_id = param._id;
var attachment_id = param._attachment;
var attachment_data = param._blob;
// [...]
};
// [...]
(To help you to design your methods, some tools are provided by jIO.util.)
The first parameter command provides some methods to act on the JIO job:
* ``success``, to tell JIO that the job is successfully terminated
``command.success(status[Text], [{custom key to add to the response}]);``
* ``resolve``, is equal to success
* ``error``, to tell JIO that the job cannot be done
``command.error(status[Text], [reason], [message], [{custom key to add to the response}])``
* ``retry``, to tell JIO that the job cannot be done now, but can be retried later. (same API than error)
* ``reject``, to tell JIO that the job cannot be done, let JIO to decide to retry or not. (same API than error)
The second parameter ``metadata`` or ``param`` is the first parameter given by the JIO user.
The third parameter ``option`` is the option parameter given by the JIO user.
Detail of what should return a method:
* post --> success("created", {"id": new_generated_id})
* put, remove, putAttachment or removeAttachment --> success(204)
* get --> success("ok", {"data": document_metadata})
* getAttachment -->
success("ok", {"data": binary_string, "content_type": content_type})
// or
success("ok", {"data": new Blob([data], {"type": content_type})})
* allDocs --> success("ok", {"data": row_object})
* check -->
.. code-block:: javascript
// if metadata provides "_id" -> check document state
// if metadata doesn't promides "_id" -> check storage state
success("no_content")
// or
error("conflict", "corrupted", "incoherent document or storage")
repair -->
.. code-block:: javascript
// if metadata provides "_id" -> repair document state
// if metadata doesn't promides "_id" -> repair storage state
success("no_content")
// or
error("conflict", "corrupted", "impossible to repair document or storage")
// DON'T DESIGN STORAGES IF THEIR IS NO WAY TO REPAIR INCOHERENT STATES
After setting up all methods, your storage must be added to jIO. This is done
using the ``jIO.addStorage()`` method, which requires two parameters: the storage
type (string) add a constructor (function). It is called like this:
.. code-block:: javascript
// add custom storage to jIO
jIO.addStorage('mystoragetype', MyStorage);
Please refer to *localstorage.js* implementation for a good example on how to
setup a storage and what methods are required. Also keep in mind, that jIO is a
job-based library, so whenever you trigger a method, a job is created, which
after being processed returns a response.
Job rules
---------
jIO job manager will follow several rules set at the creation of a new jIO
instance. When you try to call a method, jIO will create a job and will make
sure the job is really necessary and will be executed. Thanks to these job
rules, jIO knows what to do with the new job before adding it to the queue. You
can add your own rules like this:
These are the jIO **default rules**:
.. code-block:: javascript
var jio_instance = jIO.createJIO(storage_description, {
"job_rules": [{
"code_name": "readers update",
"conditions": [
"sameStorageDescription",
"areReaders",
"sameMethod",
"sameParameters",
"sameOptions"
],
"action": "update"
}, {
"code_name": "metadata writers update",
"conditions": [
"sameStorageDescription",
"areWriters",
"useMetadataOnly",
"sameMethod",
"haveDocumentIds",
"sameParameters"
],
"action": "update"
}, {
"code_name": "writers wait",
"conditions": [
"sameStorageDescription",
"areWriters",
"haveDocumentIds",
"sameDocumentId"
],
"action": "wait"
}]
});
The following actions can be used:
* ``ok`` - accept the job
* ``wait`` - wait until the end of the selected job
* ``update`` - bind the selected job to this one
* ``deny`` - reject the job
The following condition function can be used:
* ``sameStorageDescription`` - check if the storage descriptions are different.
* ``areWriters`` - check if the commands are ``post``, ``put``, ``putAttachment``, ``remove``, ``removeAttachment``, or ``repair``.
* ``areReaders`` - check if the commands are ``get``, ``getAttachment``, ``allDocs`` or ``check``.
* ``useMetadataOnly`` - check if the commands are ``post``, ``put``, ``get``, ``remove`` or ``allDocs``.
* ``sameMethod`` - check if the commands are equal.
* ``sameDocumentId`` - check if the document ids are equal.
* ``sameParameters`` - check if the metadata or param are equal in deep.
* ``sameOptions`` - check if the command options are equal.
* ``haveDocumentIds`` - test if the two commands contain document ids
Create Job Condition
--------------------
You can create 2 types of function: job condition, and job comparison.
.. code-block:: javascript
// Job Condition
// Check if the job is a get command
jIO.addJobRuleCondition("isGetMethod", function (job) {
return job.method === 'get';
});
// Job Comparison
// Check if the jobs have the same 'title' property only if they are strings
jIO.addJobRuleCondition("sameTitleIfString", function (job, selected_job) {
if (typeof job.kwargs.title === 'string' &&
typeof selected_job.kwargs.title === 'string') {
return job.kwargs.title === selected_job.kwargs.title;
}
return false;
});
Add job rules
-------------
You just have to define job rules in the jIO options:
.. code-block:: javascript
// Do not accept to post or put a document which title is equal to another
// already running post or put document title
var jio_instance = jIO.createJIO(storage_description, {
"job_rules": [{
"code_name": "avoid similar title",
"conditions": [
"sameStorageDescription",
"areWriters",
"sameTitleIfString"
],
"action": "deny",
"before": "writers update" // optional
// "after": also exists
}]
});
Clear/Replace default job rules
-------------------------------
If a job which code_name is equal to readers update, then add this rule will replace it:
.. code-block:: javascript
var jio_instance = jIO.createJIO(storage_description, {
"job_rules": [{
"code_name": "readers update",
"conditions": [
"sameStorageDescription",
"areReaders",
"sameMethod",
"haveDocumentIds"
"sameParameters"
// sameOptions is removed
],
"action": "update"
}]
});
Or you can just clear all rules before adding other ones:
.. code-block:: javascript
var jio_instance = jIO.createJIO(storage_description, {
"clear_job_rules": true,
"job_rules": [{
// ...
}]
});
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.. JIO documentation master file, created by
sphinx-quickstart on Fri Nov 15 11:55:08 2013.
You can adapt this file completely to your liking, but it should at least
contain the root `toctree` directive.
Welcome to JIO's documentation!
===============================
Contents:
.. toctree::
:maxdepth: 2
introduction
manage_documents
revision_storages
available_storages
complex_queries
metadata
developers
authors
license
Indices and tables
==================
* :ref:`genindex`
* :ref:`modindex`
* :ref:`search`
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.. role:: js(code)
:language: javascript
Introduction
============
What is jIO?
------------
JIO is a JavaScript library that allows to manage JSON documents on local or
remote storages in asynchronous fashion. jIO is an abstracted API mapped after
CouchDB, that offers connectors to multiple storages, special handlers to
enhance functionality (replication, revisions, indexing) and a query module to
retrieve documents and specific information across storage trees.
How does it work?
-----------------
JIO is separated into three parts - jIO core and storage library(ies). The core
is using storage libraries (connectors) to interact with the accociated remote
storage servers. Some queries can be used on top of the jIO allDocs method to
query documents based on defined criteria.
JIO uses a job management system, so every method called adds a job into a
queue. The queue is copied in the browsers local storage (by default), so it
can be restored in case of a browser crash. Jobs are being invoked
asynchronously with ongoing jobs not being able to re-trigger to prevent
conflicts.
Getting started
---------------
This walkthrough is designed to get you started using a basic jIO instance.
#. Download jIO core, the storages you want to use as well as the
complex-queries scripts as well as the dependencies required for the storages
you intend to use. `[Download & Fork] <https://www.j-io.org/download-and-fork>`_
#. Add the scripts to your HTML page in the following order:
.. code-block:: html
<!-- jio core + dependency -->
<script src="sha256.amd.js"></script>
<script src="rsvp-custom.js"></script>
<script src="jio.js"></script>
<!-- storages + dependencies -->
<script src="complex_queries.js"></script>
<script src="localstorage.js"></script>
<script src="davstorage.js"></script>
<script ...>
With require js, the main.js will be like this:
.. code-block:: javascript
:linenos:
require.config({
"paths": {
// jio core + dependency
// the AMD compatible version of sha256.js -> see Download and Fork
"sha256": "sha256.amd",
"rsvp": "rsvp-custom",
"jio": "jio",
// storages + dependencies
"complex_queries": "complex_queries",
"localstorage": "localstorage",
"davstorage": "davstorage"
}
});
#. jIO connects to a number of storages and allows to add handlers (or
functions) to specifc storages.
You can use both handlers and available storages to build a storage
tree across which all documents will be maintained and managed by jIO.
See :ref:`List of Available Storages <list-of-available-storages>`.
.. code-block:: javascript
// create your jio instance
var my_jio = jIO.createJIO(storage_description);
#. The jIO API provides six main methods to manage documents across the storage(s) specified in your jIO storage tree.
================== ===================================================== ========================================
Method Sample Call Description
================== ===================================================== ========================================
`post` :js:`my_jio.post(document, [options]);` Creates a new document
`put` :js:`my_jio.put(document, [options]);` Creates/Updates a document
`putAttachment` :js:`my_jio.putAttachement(attachment, [options]);` Updates/Adds an attachment to a document
`get` :js:`my_jio.get(document, [options]);` Reads a document
`getAttachment` :js:`my_jio.getAttachment(attachment, [options]);` Reads a document attachment
`remove` :js:`my_jio.remove(document, [options]);` Deletes a document and its attachments
`removeAttachment` :js:`my_jio.removeAttachment(attachment, [options]);` Deletes a document attachment
`allDocs` :js:`my_jio.allDocs([options]);` Retrieves a list of existing documents
`check` :js:`my_jio.check(document, [options]);` Check the document state
`repair` :js:`my_jio.repair(document, [options]);` Repair the document
================== ===================================================== ========================================
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Copyright and license
=====================
jIO is an open-source library and is licensed under the LGPL license. More
information on LGPL can be found `here <http://en.wikipedia.org/wiki/GNU_Lesser_General_Public_License>`_
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Revision Storages: Conflicts and Resolution
===========================================
Why Conflicts can Occur
-----------------------
Using jIO you can store documents in multiple storage locations. With
increasing number of users working on a document and some storages not being
available or responding too slow, conflicts are more likely to occur. JIO
defines a conflict as multiple versions of a document existing in a storage
tree and a user trying to save on a version that does not match the latest
version of the document.
To keep track of document versions a revision storage must be used. When doing
so, jIO creates a document tree file for every document. This file contains all
existing versions and their status and is modified whenever a version is
added/updated/removed or when storages are being synchronized.
How to solve conflicts
----------------------
Using the document tree, jIO tries to make every version of a document
available on every storage. When multiple versions of a document exist, jIO
will select the **latest**, **left-most** version on the document tree, along with the
conflicting versions (when option **conflicts: true** is set in order for
developers to setup a routine to solve conflicts.
Technically a conflict is solved by deleting alternative versions of a document
("cutting leaves off from the document tree"). When a user decides to keep a
version of a document and manually deletes all conflicting versions, the
storage tree is updated accordingly and the document is available in a single
version on all storages.
Simple Conflict Example
-----------------------
You are keeping a namecard file on your PC updating from your smartphone. Your
smartphone ran out of battery and is offline when you update your namecard on
your PC with your new email adress. Someone else change this email from your PC
and once your smartphone is recharged, you go back online and the previous
update is executed.
#. Setting up the storage tree
.. code-block:: javascript
var jio_instance = jIO.newJio({
// replicate revision storage
"type":"replicaterevision",
"storagelist":[{
"type": "revision",
"sub_storage": {
"type": "dav",
...
}
}, {
"type": "revision",
"sub_storage": {
"type": "local",
...
}
}]
});
#. Create your namecard on your smartphone
.. code-block:: javascript
jio_instance.post({
"_id": "myNameCard",
"email": "me@web.com"
}).then(function (response) {
// response.id -> "myNameCard"
// response.rev -> "1-5782E71F1E4BF698FA3793D9D5A96393"
});
This will create the document on your webDav and local storage
#. Someone else updates your shared namecard on Webdav
.. code-block:: javascript
jio_instance.put({
"email": "my_new_me@web.com",
"_id": "myNameCard"
"_rev": "1-5782E71F1E4BF698FA3793D9D5A96393"
}).then(function (response) {
// response.id -> "myNameCard"
// response.rev -> "2-068E73F5B44FEC987B51354DFC772891"
});
Your smartphone is offline, so you will now have one version (1-578...) on
your smartphone and another version on webDav (2-068...) on your PC.
#. You modify your namecard while being offline
.. code-block:: javascript
jio_instance.get({"_id": "myNameCard"}).then(function (response) {
// response.id -> "myNameCard"
// response.rev -> "1-5782E71F1E4BF698FA3793D9D5A96393"
// response.data.email -> "me@web.com"
return jio_instance.put({
"_id": "myNameCard",
"email": "me_again@web.com"
});
}).then(function (response) {
// response.id -> "myNameCard"
// response.rev -> "2-3753476B70A49EA4D8C9039E7B04254C"
});
#. Later, your smartphone is online and you retrieve your namecard.
.. code-block:: javascript
jio_instance.get({"_id": "myNameCard"}).then(function (response) {
// response.id -> "myNameCard"
// response.rev -> "2-3753476B70A49EA4D8C9039E7B04254C"
// response.data.email -> "me_again@web.com"
});
When multiple versions of a document are available, jIO returns the lastest, left-most version on the document tree (2-375... and labels all other versions as conflicting 2-068...).
#. Retrieve conflicts by setting option
.. code-block:: javascript
jio_instance.get({"_id": "myNameCard"}, {
"conflicts": true
}).then(function (response) {
// response.id -> "myNameCard"
// response.rev -> "2-3753476B70A49EA4D8C9039E7B04254C",
// response.conflicts -> ["2-068E73F5B44FEC987B51354DFC772891"]
});
The conflicting version (*2-068E...*) is displayed, because **{conflicts: true}** was
specified in the GET call. Deleting either version will solve the conflict.
#. Delete conflicting version
.. code-block:: javascript
jio_instance.remove({
"_id": "myNameCard",
"_rev": "2-068E73F5B44FEC987B51354DFC772891"
}).then(function (response) {
// response.id -> "myNameCard"
// response.rev -> "3-28910A4937537B5168E772896B70EC98"
});
When deleting the conflicting version of your namecard, jIO removes this
version from all storages and sets the document tree leaf of this version to
deleted. All storages now contain just a single version of your namecard
(2-3753...). Note, that the on the document tree, removing a revison will
create a new revision with status set to *deleted*.
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