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What is it? A pad is an online collaborative text editor. The expiry date is defined according to the date of last modification of the pad. To participate in the development of the software, suggest improvements or simply download it, go to the. EtherCalc is Free Software; it runs on GNU/Linux, FreeBSD, Mac OS X and To ensure the recalculations are up-to-date, WikiCalc adopted a thin-client each tailored to one of our server flavors (intranet, internet, and multi-tenant hosting). Create dating website fast & easy with an open source dating software. A WordPress based platform that gives freedom to start your own online dating business.
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The optional audit part contains the history of commands executed in the previous editing session. The serialized save format for the spreadsheet looks like this: This makes it possible for Drupal's Sheetnode plugin to use PHP to convert between this format and other popular spreadsheet formats, such as Excel. Now that we have a good idea about how the pieces in SocialCalc fit together, let's look at two real-world examples of extending SocialCalc. Rich-text Editing The first example we'll look at is enhancing SocialCalc's text cells with wiki markup to display its rich-text rendering right in the table editor: We added this feature to SocialCalc right after its 1.
Since Socialtext already has an open-source wiki platform, it was natural to re-use the syntax for SocialCalc as well. To implement this, we need a custom renderer for the textvalueformat of text-wiki, and to change the default format for text cells to use it. What is this textvalueformat, you ask? Types and Formats In SocialCalc, each cell has a datatype and a valuetype.
It does so by inspecting each cell's valuetype: If it begins with t, then the cell's textvalueformat attribute determines how generation is done.
If it begins with n, then the nontextvalueformat attribute is used instead. However, if the cell's textvalueformat or nontextvalueformat attribute is not defined explicitly, then a default format is looked up from its valuetype, as shown below: Support for the text-wiki value format is coded in SocialCalc.
This is the recommended style throughout the SocialCalc codebase; it improves modularity by making it possible to plug in different ways of expanding wikitext, as well as keeping compatibility with embedders that do not desire this feature.
InitializeSpreadsheetControl "tableeditor", 0, 0, 0 ; spreadsheet. ExecuteCommand 'set sheet defaulttextvalueformat text-wiki' ; Taken together, the Render step now works like this: The enhanced SocialCalc now supports a rich set of wiki markup syntax: Real-time Collaboration The next example we'll explore is multi-user, real-time editing on a shared spreadsheet.
This may seem complicated at first, but thanks to SocialCalc's modular design all it takes is for each on-line user to broadcast their commands to other participants. To distinguish between locally-issued commands and remote commands, we add an isRemote parameter to the ScheduleSheetCommands method: Once it's in place, the same commands will be executed on all users connected to the same spreadsheet.
That worked reasonably well, enabling XO instances in the same Sugar network to collaborate on a common SocialCalc spreadsheet. Cross-browser Transport To make this work across browsers and operating systems, we use the Web:: The operation flow is shown below: Conflict Resolution The first one is a race-condition in the order of commands executed: If users A and B simultaneously perform an operation affecting the same cells, then receive and execute commands broadcast from the other user, they will end up in different states: The process used to resolve the conflict is as follows: When a client broadcasts a command, it adds the command to a Pending queue.
When a client receives a command, it checks the remote command against the Pending queue: If the Pending queue is empty, then the command is simply executed as a remote action. If the command matches a command in the Pending queue, then the local command is removed from the queue. Otherwise, check if there are any queued commands that conflict with the received command: If there are conflicting commands, first perform an Undo on those commands, and marks them for later Redo.
After undoing all conflicting commands, execute the remote command as usual. When a marked-for-redo command is received from the server, execute it again, then remove it from the queue. Remote Cursors Even with race conditions resolved, it is still suboptimal to accidentally overwrite the cell another user is currently editing. A simple improvement is for each client to broadcast its cursor position to other users, so everyone can see which cells are being worked on.
To implement this idea, we add another broadcast handler to the MoveECellCallback event: However, a cell may already define its own border property, and since border is mono-colored, it can only represent one cursor on the same cell.
Therefore, on browsers with support for CSS3, we use the box-shadow property to represent multiple peer cursors in the same cell: Lessons Learned We delivered SocialCalc 1. The experience of collaborating with my colleagues at Socialtext under Dan Bricklin's guidance was very valuable to me, and I'd like to share some lessons I learned during that time. Chief Designer with a Clear Vision In his book The Design of Design, Fred Brooks argues that when building complex systems, the conversation is much more direct if we focus on a coherent design concept, rather than derivative representations.
According to Brooks, the formulation of such a coherent design concept is best kept in a single person's mind: Since conceptual integrity is the most important attribute of a great design, and since that comes from one or a few minds working uno animo, the wise manager boldly entrusts each design task to a gifted chief designer.
In the case of SocialCalc, having Tracy Ruggles as our chief user-experience designer was the key for the project to converge toward a shared vision. Since the underlying SocialCalc engine was so malleable, the temptation of feature creep was very real.
Tracy's ability to communicate using design sketches really helped us present features in a way that feels intuitive to users. Wikis for Project Continuity Before I joined the SocialCalc project, there was already over two years' worth of ongoing design and development, but I was able to catch up and start contributing in less than a week, simply due to the fact that everything is in the wiki.
From the earliest design notes to the most up-to-date browser support matrix, the entire process was chronicled in wiki pages and SocialCalc spreadsheets. Reading through the project's workspace brought me quickly to the same page as others, without the usual hand-holding overhead typically associated with orienting a new team member. This would not be possible in traditional open source projects, where most conversation takes place on IRC and mailing lists and the wiki if present is only used for documentations and links to development resources.
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For a newcomer, it's much more difficult to reconstruct context from unstructured IRC logs and mail archives. Embrace Time Zone Differences David Heinemeier Hansson, creator of Ruby on Rails, once remarked on the benefit of distributed teams when he first joined 37signals: The seven time zones between Copenhagen and Chicago actually meant that we got a lot done with few interruptions.
With nine time zones between Taipei and Palo Alto, that was true for us during SocialCalc's development as well. We often completed an entire Design-Development-QA feedback cycle within a hour day, with each aspect taking one person's 8-hour work day in their local daytime. This asynchronous style of collaboration compelled us to produce self-descriptive artifacts design sketch, code and testswhich in turn greatly improved our trust in each other.
Optimizing for FunI summarized my experience leading a distributed team implementing the Perl 6 language into a few observations. When developing SocialCalc, we took great care in distributing knowledge among team members with collaborative code ownership, so nobody would become a critical bottleneck. Furthermore, we pre-emptively resolved disputes by actually coding up alternatives to explore the design space, and were not afraid of replacing fully-working prototypes when a better design arrived.
These cultural traits helped us foster a sense of anticipation and camaraderie despite the absence of face-to-face interaction, kept politics to a minimum, and made working on SocialCalc a lot of fun.
Drive Development with Story Tests Prior to joining Socialtext, I've advocated the "interleave tests with the specification" approach, as can be seen in the Perl 6 specificationwhere we annotate the language specification with the official test suite. However, it was Ken Pier and Matt Heusser, the QA team for SocialCalc, who really opened my eyes to how this can be taken to the next level, bringing tests to the place of executable specification.
In Chapter 16 ofMatt explained our story-test driven development process as follows: The basic unit of work is a "story," which is an extremely lightweight requirements document.
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A story contains a brief description of a feature along with examples of what needs to happen to consider the story completed; we call these examples "acceptance tests" and describe them in plain English.
During the initial cut of the story, the product owner makes a good-faith first attempt to create acceptance tests, which are augmented by developers and testers before any developer writes a line of code. It's hard to overstate the benefit of having story tests as a common language to express and validate requirements.
It was instrumental in reducing misunderstanding, and has all but eliminated regressions from our monthly releases. Based on the Mozilla Public License, CPAL is designed to allow the original author to require an attribution to be displayed on the software's user interface, and has a network-use clause that triggers share-alike provisions when derived work is hosted by a service over the network. After its approval by both the Open Source Initiative and the Free Software Foundationwe've seen prominent sites such as Facebook and Reddit opting to release their platform's source code under the CPAL, which is very encouraging.
Because CPAL is a "weak copyleft" license, developers can freely combine it with either free or proprietary software, and only need to release modifications to SocialCalc itself. This enabled various communities to adopt SocialCalc and made it more awesome. Examples from this chapter, including rich-text and collaborative editing, can be found on http: A historical archive of WikiCalc 1.
There are many interesting possibilities with this open-source spreadsheet engine, and if you can find a way to embed SocialCalc into your favorite project, we'd definitely love to hear about it. SocialCalc performs all of its computations in the browser; it uses the server only for loading and saving spreadsheets.
This chapter will discuss the revamped architecture we made for EtherCalca successor to SocialCalc optimized toward simultaneous editing. We'll see how we arrived at that architecture, how we used profiling tools, and how we made new tools to overcome performance problems.
Design Constraints The Socialtext platform has both behind-the-firewall and in-the-cloud deployment options, imposing unique constraints on EtherCalc's resource and performance requirements. Deploying on intranets means that we can't simply throw hardware at the problem in the same way multi-tenant, hosted-only systems did e.
Compared to intranet deployments, cloud-hosted instances offer better capacity and on-demand extension, but network connections from browsers are usually slower and fraught with frequent disconnections and reconnections.
To recap, constraints on these resources shaped EtherCalc's architecture directions: An event-based server allows us to scale to thousands of concurrent connections with a small amount of RAM.
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By sending spreadsheet operations, instead of spreadsheet content, we reduce bandwidth use and allow recovering over unreliable network connections. Initial Prototype We started with a WebSocket server implemented in Perl 5, backed by Feersuma libev -based non-blocking web server developed at Socialtext.
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