'An expert is a man who has made all the mistakes which can be made, in a narrow field'
Lately we started to discuss JogAmp‘s Project Management a little bit and touched things like efficient Java JNI binding to native foreign functions.
Allow me to elaborate on this issue a little bit (forum copy), perhaps even go this far to debate down on the metal C++ vs virtual Java performance.
Keep in mind, I am an old dog and always focus on performance and such thing even on the Java side 😉 Continue reading “Some late C++/Java Project Experience”
Earlier this year, we required a true distraction from the chaos of this world and a sad tragedy in our closer circle. What would have been more rewarding for a little recovery than indulging oneself with game theory, paying homage to Toru Iwatani‘s classic Puckman? Both my sons loved the idea and we added this work to our little cs-class. My older one was eager to learn how the math behind the ghosts works. Euclidian geometry, Pythagoras, points and vectors .. plus the strategy of choosing targets WoW! 😉 We completed the little fun endeavor using C++17 and the SDL2 library, resulting in a working nostalgic re-implementation.
At the bottom of this article I have placed a little video recording, partially demonstrating the results. Continue reading “Chase, Scatter and Phantoms – Sisyphus alike Ghost Fate”
Natural numbers are defined as the sequence of numbers fully defined by their initial value, its successor and the successor of its successor and so forth. Despite the beauty of their intrinsic Dedekind–Peano axioms, they are also fully proven by induction.
Continue reading “Rational Expressions with frictionless Fractions and implemented Time”
Earlier I started elaborating on Direct-BT C++ implementation details, covering communication channels and data structures suitable for concurrency.
This part shall cover Jaulib’s jau::function<R(A…)>, used to manage callback lists e.g. in BTManager or simply utilizing them to delegate functionality like in jau::service_runner. Continue reading “Identifiable C++ Function Pointer of any kind in Direct-BT (Part 2)”
This is the first article covering Direct-BT‘s implementation details including jaulib.
See Direct-BT, Bluetooth Server and Client Programming in C++ and Java (Part 1) for a little introduction to Direct-BT.
As described, we were required to utilize the host Bluetooth implementation in the GNU/Linux kernel, i.e. BlueZ/Kernel directly without D-Bus to achieve best performance and access the native HCI, L2CAP/GATT and SMP communication channels directly. Continue reading “Direct-BT C++ Implementation Details (Part 1)”
This is the first article covering Direct-BT using version 2.7.1 and may give you a little introduction into this project.
See Direct-BT C++ Implementation Details (Part 1) for some insight view.
Direct-BT provides direct Bluetooth LE and BREDR programming, offering robust high-performance support for embedded & desktop with zero overhead via C++ and Java.
It supports a fully event driven workflow from adapter management, device discovery to GATT programming, using its platform agnostic HCI, L2CAP, SMP and GATT protocol implementation.
Multiple Bluetooth adapter are handled, as well as multiple concurrent connections per adapter.
Peripheral server device programming is supported as well as the central client, which is also used for Java and C++ self unit testing across two or more Bluetooth adapter. Continue reading “Direct-BT, Bluetooth Server and Client Programming in C++ and Java (Part 1)”
I happily joined Xerxes’s call to enhance the
Bluetooth experience on embedded GNU/Linux for Zafena.
This ended up in a new Bluetooth LE (almost done) and BREDR (in progress)
C++-11 implementation named Direct-BT.
It exposes a modern Java binding to the refactored original TinyB. Continue reading “What is Direct-BT? Where is JogAmp 2.4.0?”
Debian General Resolution: Init systems and systemd
Just in case they vote on Choice 1: F: Focus on systemd,
i.e. completely disabling another init script, I have to pick up a new distribution.
Today, I mostly run Debian on desktop and server.
Most server use a non-systemd init system for sanity.
Easing systemd dependencies via systemd-shim, libsystemd0
and using sysvinit. Continue reading “Debian General Resolution: Init systems and systemd on 12/7 – 12/27”
While I was doing the admin work for the next JogAmp release 2.4.0 I added some old video teaser supporting the point of enabling high performance hardware accelerated features to anything Java™’ish for any platforms.
It rang some belts that all these demos were easily and interactive launched used Applets within the browser.
Sadly today, browser don’t support such plugin’s anymore, which enabled simplified launching of Java™ Applet’s and its seamless integration into the web page.
I well remember the debates back then, about bloated browsers and security issues. But what do we have today? Bigger (or bloated) browsers containing the VM implementation itself, only that this time it is not Java™ but a JavaScript VM. Not a big qualitative change, but a restriction to choice, IMHO. This move only disabled third parties enabling their content via the browser interface. Almost sounds like the old Microsoft and Firefox browser wars, only that this time all browser vendor are aligned and believe to be the good guys now 😉
Most notable for me is that the security issues has not changed here at all. Continue reading “Resurrecting a dying Species? Bring back Java™ to the Browser?”
Note that all branches have been merged back into master.
See wiki entry.
See wiki entry. Continue reading “JogAmp 2.4.0 Release Feature Freeze & Complete”
