OpenSync Interview – syncing on the free desktop

Friday, May 19, 2006

This interview intends to provide some insight into OpenSync, an upcoming free unified data synchronization solution for free software desktops such as KDE, commonly used as part of the GNU/Linux operating system.

Hi Cornelius, Armin and Tobias. As you are now getting close to version 1.0 of OpenSync, which is expected to become the new synchronisation framework for KDE and other free desktops, we are quite interested in the merits it can provide for KDE users and for developers, as well as for the Open Source Community as a whole. So there’s one key-question before I move deeper into the details of OpenSync:

What does OpenSync accomplish, that no one did before?

Cornelius:

First of all it does its job of synchronizing data like addressbooks and calendars between desktop applications and mobile devices like PDAs and cell phones.

But the new thing about OpenSync is that it isn’t tied to a particular device or a specific platform. It provides an extensible and modular framework that is easy to adopt for application developers and people implementing support for syncing with mobile devices.

OpenSync is also independent of the desktop platform. It will be the common syncing backend for at least KDE and GNOME and other projects are likely to join. That means that the free desktop will have one common syncing solution. This is something really new.

How do the end-users profit from using synching solutions that interface with OpenSync as framework?

Cornelius:

First, the users will be able to actually synchronize all their data. By using one common framework there won’t be any “missing links”, where one application can sync one set of devices and another application a different one. With OpenSync all applications can sync all devices.

Second, the users will get a consistent and common user interface for syncing across all applications and devices. This will be much simpler to use than the current incoherent collection of syncing programs you need if you have more than the very basic needs.

How does OpenSync help developers with coding?

Cornelius:

It’s a very flexible and well-designed framework that makes it quite easy for developers to add support for new devices and new types of data. It’s also very easy to add support for OpenSync to applications.

The big achievement of OpenSync is that it hides all the gory details of syncing from the developers who work on applications and device support. That makes it possible for the developers to concentrate on their area of expertise without having to care what’s going on behind the scenes.

I have written quite a lot of synchronization code in the past. Trust me, it’s much better, if someone just takes care of it for you, and that’s what OpenSync does.

Tobias:

Another point to mention is the python wrapper for opensync, so you are not bound to C or C++, but can develop plugins in a high level scripting language.

Why should producers of portable devices get involved with your team?

Cornelius:

OpenSync will be the one common syncing solution for the free desktop. That means there is a single point of contact for device manufacturers who want to add support for their devices. That’s much more feasible than addressing all the different applications and solutions we had before. With OpenSync it hopefully will become interesting for manufacturers to officially support Linux for their devices.

Do you also plan to support applications of OpenSync in proprietary systems like OSX and Windows?

Cornelius:

OpenSync is designed to be cross-platform, so it is able to run on other systems like Windows. How well this works is always a question of people actually using and developing for this system. As far as I know there isn’t a real Windows community around OpenSync yet. But the technical foundation is there, so if there is somebody interested in working on a unified syncing solution on Windows, everybody is welcome to join the project.

What does your synchronisation framework do for KDE and for KitchenSync in particular?

Cornelius:

OpenSync replaces the KDE-specific synchronization frameworks we had before. Even in KDE we had several separate syncing implementations and with OpenSync we can get replace them with a common framework. We had a more generic syncing solution in KDE under development. This was quite similar from a design point of view to OpenSync, but it never got to the level of maturity we would have needed, because of lack of resources. As OpenSync fills this gap we are happy to be able to remove our old code and now concentrate on our core business.

What was your personal reason for getting involved with OpenSync?

Cornelius:

I wrote a lot of synchronization code in the past, which mainly came from the time where I was maintaining KOrganizer and working on KAddressBook. But this always was driven by necessity and not passion. I wanted to have all my calendar and contact data in one place, but my main objective was to work on the applications and user interfaces handling the data and not on the underlying code synchronizing the data.

So when the OpenSync project was created I was very interested. At GUADEC in Stuttgart I met with Armin, the maintainer of OpenSync, and we talked about integrating OpenSync with KDE. Everything seemed to fit together quite well, so at Linuxtag the same year we had another meeting with some more KDE people. In the end we agreed to go with OpenSync and a couple of weeks later we met again in Nuernberg for three days of hacking and created the KDE frontend for OpenSync. In retrospect it was a very pleasant and straightforward process to get where we are now.

Armin:

My reason to get involved (or better to start) OpenSync was my involvement with its predecessor Multisync. I am working as a system administrator for a small consulting company and so I saw some problems when trying to find a synchronization solution for Linux.

At that point I joined the Multisync project to implement some plugins that I thought would be nice to have. After some time I became the maintainer of the project. But I was unhappy with some technical aspects of the project, especially the tight coupling between the syncing logic and the GUI, its dependencies on GNOME libraries and its lack of flexibility.

Tobias:

Well, I have been a KDE PIM developer for several years now, so there was no way around getting in touch with synchronization and KitchenSync. Although I liked the idea of KitchenSync, I hated the code and the user interface […]. So when we discussed to switch to OpenSync and reimplementing the user interface, I volunteered immediately.

Can you tell us a bit about your further plans and ideas?

Cornelius:

The next thing will be the 1.0 release of OpenSync. We will release KitchenSync as frontend in parallel.

Armin:

There are of course a lot of things on my todo and my wishlist for opensync. For the near future the most important step is the 1.0 release, of course, where we still have some missing features in OpenSync as well as in the plugins.

One thing I would really like to see is a thunderbird plugin for OpenSync. I use thunderbird personally and would really like to keep my contacts up to date with my cellular, but I was not yet able to find the time to implement it.

Tobias:

One thing that would really rock in future versions of OpenSync is an automatic hardware detection mechanism, so when you plugin your Palm or switch on your bluetooth device, OpenSync will create a synchronization group automatically and ask the user to start syncing. To bring OpenSync to the level of _The Syncing Solution [tm]_ we must reduce the necessary configuration to a minimum.

What was the most dire problem you had to face when creating OpenSync and how did you face it?

Cornelius:

Fortunately the problems which I personally would consider to be dire are solved by the implementation of OpenSync which is well hidden from the outside world and [they are] an area I didn’t work on 😉

Armin:

I guess that I am the right person to answer this question then 🙂

The most complicated part of OpenSync is definitely the format conversion, which is responsible for converting the format of one device to the format that another device understands.

There are a lot of subsystems in this format conversion that make it so complex, like conversion path searching, comparing items, detection of mime types and last but not least the conversion itself. So this was a hard piece of work.

What was the greatest moment for you?

Cornelius:

I think the greatest moment was when, after three days of concentrated hacking, we had a first working version of the KDE frontend for OpenSync. This was at meeting at the SUSE offices in Nuernberg and we were able to successfully do a small presentation and demo to a group of interested SUSE people.

Armin:

I don’t remember a distinct “greatest moment”. But what is a really great feeling is to see that a project catches on, that other people get involved, use the code you have written and improve it in ways that you haven’t thought of initially.

Tobias:

Hmm, also hacking on OpenSync/KitcheSync is much fun in general, the greatest moment was when the new KitchenSync frontend synced two directories via OpenSync the first time. But it was also cool when we managed to get the IrMC plugin working again after porting it to OpenSync.

As we now know the worst problem you faced and your greatest moment, the only one missing is: What was your weirdest experience while working on OpenSync?

Cornelius:

Not directly related to OpenSync, but pretty weird was meeting a co-worker at the Amsterdam airport when returning from the last OpenSync meeting. I don’t know how high the chance is to meet somebody you know on a big random airport not related at all to the places where you or the other person live, but it was quite surprising.

Tobias:

Since my favorite language is C++, I was always confused how people can use plain C for such a project, half the time your are busy with writing code for allocating/freeing memory areas. Nevertheless Armin did a great job and he is always a help for solving strange C problems 🙂

Now I’d like to move on to some more specific questions about current and planned abilities of OpenSync. As first, I’ve got a personal one:

I have an old iPod sitting around here. Can I or will I be able to use a program utilizing OpenSync to synchronize my calendars, contacts and music to it?

Cornelius:

I’m not aware of any iPod support for OpenSync up to now, but if it doesn’t exist yet, why not write it? OpenSync makes this easy. This is a chance for everybody with the personal desire to sync one device or another to get involved.

Armin:

I dont think that there is iPod support yet for OpenSync. But it would definitely be possible to use OpenSync for this task. So if someone would like to implement an iPod plugin, I would be glad to help 🙂

Which other devices do you already support?

Cornelius:

At this time, OpenSync supports Palms, SyncML and IrMC capable devices.

Which programs already implement OpenSync and where can we check back to find new additions?

Cornelius:

On the application side there is support for Evolution [GNOME] and Kontact with KitchenSync [KDE] on the frontend side and the backend side and some more. I expect that further applications will adopt OpenSync once the 1.0 version is released.

Armin:

Besides kitchensync there already are a command line tool and a port of the multisync GUI. Aside from the GUIs, I would really like to see OpenSync being used in other applications as well. One possibility for example would to be integrate OpenSync into Evolution to give users the possibility to synchronize their devices directly from this application. News can generally be found on the OpenSync web site www.opensync.org.

It is time to give the developers something to devour, too. I’ll keep this as a short twice-fold technical dive before coming to the takeoff question, even though I’m sure there’s information for a double-volume book on technical subleties.

As first dive: How did you integrate OpenSync in KitchenSync, viewed from the coding side?

Cornelius:

OpenSync provides a C interface. We wrapped this with a small C++ library and put KitchenSync on top. Due to the object oriented nature of the OpenSync interfaces this was quite easy.

Recently I also started to write a D-Bus frontend for OpenSync. This also is a nice way to integrate OpenSync which provides a wide variety of options regarding programming languages and system configurations.

And for the second, deeper dive:

Can you give us a quick outline of those inner workings of OpenSync, from the developers view, which make OpenSync especially viable for application in several different desktop environments?

Cornelius:

That’s really a question for Armin. For those who are interested I would recommend to have a look at the OpenSync website. There is a nice white paper about the internal structure and functionality of OpenSync.

Armin:

OpenSync consists of several parts:

First there is the plugin API which defines what functions a plugin has to implement so that OpenSync can dlopen() it. There are 2 types of plugins:

A sync plugin which can synchronize a certain device or application and which provides functions for the initialization, handling the connection to a device and reading and writing items. Then there is a format plugin which defines a format and how to convert, compare and detect it.

The next part is a set of helper functions which are provided to ease to programming of synchronization plugins. These helper functions include things like handling plugin config files, HashTables which can be used to detect changes in sets of items, functions to detect when a resync of devices is necessary etc.

The syncing logic itself resides in the sync engine, which is a separate part. The sync engine is responsible for deciding when to call the connect function of a plugin, when to read or write from it. The engine also takes care of invoking the format conversion functions so that each plugin gets the items in its required format.

If you want more information and details about the inner workings of OpenSync, you should really visit the opensync.org website or ask its developers.

To add some more spice for those of our readers, whose interest you just managed to spawn (or to skyrocket), please tell us where they can get more information on the OpenSync Framework, how they can best meet and help you and how they can help improving sync-support for KDE by helping OpenSync.

Cornelius:

Again, the OpenSync web site is the right source for information. Regarding the KDE side, the kde-pim@kde.org mailing list is probably the right address. At the moment the most important help would be everything which gets the OpenSync 1.0 release done.

[And even though] I already said it, it can’t be repeated too often: OpenSync will be the one unified syncing solution for the free desktop. Cross-device, cross-platform, cross-desktop.

It’s the first time I feel well when thinking about syncing 😉.

Armin:

Regarding OpenSync, the best places to ask would be the opensync mailing lists at sourceforge or the #opensync irc channel on the freenode.net servers.

There are always a lot of things where we could need a helping hand and where we would be really glad to get some help. So everyone who is interested in OpenSync is welcome to join.

Many thanks for your time!

Cornelius:

Thanks for doing the interview. It’s always fun to talk about OpenSync, because it’s really the right thing.

Armin:

Thank you for taking your time and doing this interview. I really appreciate your help!

Tobias:

Thanks for your work. Publication and marketing is something that is really missing in the open source community. We have nice software but nobody knows 😉

Further Information on OpenSync can be found on the OpenSync Website: www.opensync.org

This Interview was done by Arne Babenhauserheide in April 2006 via e-mail and KOffice on behalf of himself, the OpenSource Community, SpreadKDE.org and the Dot (dot.kde.org).It was first published on the Dot and is licensed under the cc-attribution-sharealike-license.A pdf-version with pictures can be found at opensync-interview.pdf (OpenDocument version: opensync-interview.odt)

Friday, April 13, 2007

Google has announced its intention of taking over the Internet advertising agency DoubleClick in a deal worth $3.1 billion. DoubleClick has also confirmed the deal and hopes it will be completed before the end of 2007.

Rumours of a takeover offer for DoubleClick had been circulating, with Microsoft, Time Warner and Yahoo! all reportedly interested in making an offer for the company.

Six months ago, Google bought YouTube for $1.65 billion. The current takeover is the largest in Google’s history. In a press release, Google says the acquisition “will enable Google to extend our ad network and develop deeper relationships with our partners. This new partnership represents a tremendous opportunity for us at Google to broaden and deepen our inventory of available ads and to better serve both our publishers and users.”

DoubleClick provides software for Internet advertising and brings together advertisers, advertisement agencies and website developers. DoubleClick is currently owned by the majority share-holders Hellman & Friedman, a private equity firm, with JMI Management also having a large stake in the company.

Monday, September 23, 2013

Over the past week, diplomatic actions have averted — or, at least delayed — military strikes on Syria by the United States. Wikinews sought input from a range of international experts on the situation; and, the tensions caused by Russia’s support for the al-Assad regime despite its apparent use of chemical weapons.

File:Ghouta chemical attack map.svg

Tensions in the country increased dramatically, late August when it was reported between 100 and 1,300 people were killed in an alleged chemical attack. Many of those killed appeared to be children, with some of the pictures and video coming out of the country showing — according to witnesses — those who died from apparent suffocation; some foaming at the mouth, others having convulsions.

Amongst Syria’s few remaining allies, Iran, China, and Russia continue to oppose calls for military intervention. In an effort to provide a better-understanding of the reasoning behind their ongoing support, the following people were posed a range of questions.

Thursday, February 9, 2017

On Monday, scientists from the Stanford University School of Medicine announced the invention of a new diagnostic tool that can sort cells by type: a tiny printable chip that can be manufactured using standard inkjet printers for possibly about one U.S. cent each. Lead researchers say this may bring early detection of cancer, tuberculosis, HIV and malaria to patients in low-income countries, where the survival rates for illnesses such as breast cancer can be half those of richer countries.

Existing methods tend to identify cell types using fluorescent or magnetic labels, which take time to attach, but this platform uses the phenomenon of dielectrophoresis: because different kinds of cells have different levels of receptivity to electrical fields, a trait called polarizability, when an electric potential gradient is activated around the chip, different cells are pulled in different directions at different speeds. This allows doctors to diagnose cancer by determining the number of tumor cells in a patient’s blood sample. Different chips can be printed to diagnose different diseases.

Physically, the scientists say, the system has two parts. Cells are held in a clear microfluidic chamber made of silicone. The chip itself is an electronic strip that can be printed onto flexible polyester. Most lab-on-a-chip devices must be manufactured by professional staff in specialized facilities called clean rooms and can take weeks, but the chip component of this system can be made almost anywhere in as little as twenty minutes. The chips cost approximately one U.S. cent to produce (US$0.01) and can be reused. For comparison, a standard flow cytometry machine can cost US$100,000 to purchase.

“Enabling early detection of diseases is one of the greatest opportunities we have for developing effective treatments,” said lead author and electrical engineer Dr. Rahim Esfandyarpour. “Maybe $1 in the U.S. doesn’t count that much, but somewhere in the developing world, it’s a lot of money.”

Senior author Dr. Ron Davis of the Stanford University Genome Technology Center compared this invention to that of low-cost genome sequencing, which helped lead to personalized medicine.

The findings appeared in the Proceedings of the National Academy of Sciences on Monday.

Tuesday, June 14, 2005File:JacobZuma.jpg

Today at about 1600 UTC/GMT, South African President Thabo Mbeki announced in a special session of parliament that he has taken action he feels is necessary, that is to “release [his deputy president], Jacob Zuma, from his responsibilities as deputy president of the republic and member of the cabinet”.

Zuma was implicated in corruption arising from his relationship with his former financial adviser, Schabir Shaik, who was convicted of corruption and fraud earlier this month. Shaik was found guilty by Durban High Court of two counts of corruption and one of fraud and was sentenced to 15 years imprisonment.

The President has called this one of his toughest decisions. Opposition leader of the Democratic Alliance immediately praised the president for holding “principle over politics”, and, while deeply saddened, former president Nelson Mandela supported Mbeki’s decision. Jacob Zuma was the favourite of the ruling African National Congress party to succeed Thabo Mbeki as president.

Following this ordeal, the government of South Africa has reaffirmed its dedication to the reduction and eventual elimination of corruption in all areas of politics.

UPDATE (July 7)

The African National Congress held a meeting of it’s National General Council over the weekend of 2-3 July. Zuma attracted a lot of favourable attention, mostly from people who wished to defeat policy initiatives that included relaxing some of the legal constraints on employers. He was reinstated as ANC deputy president and, in a first for the party, granted a salary (details not revealed). It now appears that Jacob Zuma’s political future is closely tied to that of the “left wing” of the ANC.

Thursday, January 17, 2008

The third Test between Australia and India commenced on Wednesday at the WACA in Perth.

India won the toss, and Indian captain Anil Kumble elected to bat. India quickly made a half century in nine overs. Shortly after, the first wicket fell with Virender Sehwag caught behind by Adam Gilchrist for 29 runs. About half an hour before lunch with three more overs, the next wicket fell when Gilchrist also caught Wasim Jaffer.

India were 2/74 at lunch, and played well during the afternoon, losing no wickets. Rahul Dravid was dropped on 11 runs by Michael Clarke, and went on to share a partnership of 139 runs with Sachin Tendulkar as India reached 2/177 at tea.

In the last session India put on 120 runs, losing four wickets, including two just before stumps. Brett Lee trapped lbw Tendulkar (71), while Sourav Ganguly fell for just nine runs soon afterwards. Dravid reached 93 runs before being caught by Ricky Ponting, and V. V. S. Laxman was dismissed for 27 runs shortly before the close of play. India finished the day on 6/297.

Brett Lee was the leading wicket taker, tallying 3 wickets.

Australia lead the four match Test series 2-0, after a controversial second Test prompting India to threaten to pull out of the tour.

Sunday, November 20, 2005

One of the most important arguments in the run-up to the Iraq war made by Colin Powell in his United Nations speech and President Bush in his State of the Union address was that Iraq had an active biological weapons program and possessed mobile biological weapons labs. According to an investigation by the Senate Intelligence Committee, the main source for this information was an Iraqi defector codenamed Curveball who was a source for the German central intelligence agency BND.

Several German intelligence officials responsible for Curveball have now told the LA Times that the Bush administration and the CIA have repeatedly exaggerated his claims and ignored warnings of the BND that the source was unreliable. Recounting his reaction after seeing Powell’s United Nations speech one German intelligence officer said: “We were shocked. Mein Gott! We had always told them it was not proven…. It was not hard intelligence.” This corroborates reporting by the German weekly newspaper Die Zeit from 2003 and 2004 based on statements of unnamed senior German intelligence officials.

Nine months earlier, in May 2002, a fabricator warning was posted in Curveball’s file in U.S. intelligence databases. Powell was never warned that his United Nations speech contained material that both the DIA and CIA had determined was false, even though several people present at Powell’s CIA meetings were fully aware of this.

At this time German intelligence officers would not let the CIA meet directly with Curveball, but allowed a CIA doctor to draw blood samples. Questioning the validity of Curveball’s information in front of his CIA supervisor, the doctor was advised to “Keep in mind that this war is going to happen regardless of what Curveball said or didn’t say and the Powers That Be probably aren’t terribly interested in whether Curveball knows what he’s talking about.”

Shortly after Powell’s UN speech and several days before the invasion, United Nations weapons inspectors attempted to directly verify several key claims made by Curveball, but concluded that they were unsustainable. The White House insisted on its WMD claims based on Curveball’s information.

Even after the invasion, when more and more of Curveball’s accounts were shown to be pure fabrication, the CIA and the Bush administration relied on Curveball’s information. When U.S. forces discovered trucks with lab equipment and Curveball claimed that these were identical to the ones he has been reporting about, the CIA rushed to publish a White Paper claiming that these trucks were part of Saddam Hussein’s secret biological weapons program and Bush claimed publicly that “We found the weapons of mass destruction.” Several days later, twelve of the thirteen WMD experts who analyzed the trucks agreed that the equipment was not suited for biological weapons production, with the only dissenting voice coming from the author of the original White Paper.

The White Paper remains posted on the CIA website to this date, and President Bush has not yet retracted his statement that Iraq produced “germ warfare agents” made in his State of the Union address or his postwar assertions that “we found the weapons of mass destruction.”