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From "Michael Fitzner (JIRA)" <>
Subject [jira] [Commented] (ETCH-157) UDP implementation for Java, C# and C binding
Date Fri, 27 May 2011 17:01:48 GMT


Michael Fitzner commented on ETCH-157:

Hi Armin,

We added already some patches for the UDP multisession (Java and C# for Windows) patches into
the trunk. The migration of the C# patch to a Linux mono system makes however a lot of trouble
at the moment. The main issues are that current Linux distributions like ubuntu 10.10, 11.04
have no support for the newest mono version with .Net 4.0 at moment. Also the mono page
shows that the entire .Net 4.0 framework is not completely finished with the mono 2.8 release.
Because of this; the .Net etch binding could not be used on a default desktop system without
a special installation of the mono environment. In terms of these limitations I think we should
avoid the migrating to .Net 4.0 only because of some classes like BlockingCollection. I would
suggest just using thread synchronizations like “synchronized” statement and WaitHandles
for the UDP implementation (e.g. for the UdpConnection). If we do so, the etch .Net runtime
will stay compatible to the .Net framework 2.0.


> UDP implementation for Java, C# and C binding
> ---------------------------------------------
>                 Key: ETCH-157
>                 URL:
>             Project: Etch
>          Issue Type: New Feature
>          Components: build, c-binding, compiler, csharp-binding, examples, java-binding,
>    Affects Versions: 1.2
>            Reporter: Armin Müller
>              Labels: patch
>         Attachments: 0001-build-add-skip.examples-property.patch, 0002-binding-csharp-bump-dependencies-to-.NET-4.0-and-NUn.patch,
0003-binding-csharp-add-mono-support.patch, 0004-binding-csharp-add-udp-transport-support.patch,
0005-binding-java-add-udp-transport-support.patch, 0006-binding-csharp-add-udp-single-session-support.patch,
0007-binding-java-add-udp-single-session-support.patch, 0008-binding-c-add-inet_who-object.patch,
0009-binding-c-add-udp-single-session-transport.patch, 0010-compiler-add-Signal-annotation-support.patch,
0011-binding-csharp-add-Signal-support.patch, 0012-binding-java-add-Signal-support.patch,
0013-binding-c-extend-send-sendex-for-etch_who.patch, 0014-binding-c-add-Signal-support.patch,
0015-examples-add-signals-example-for-csharp-java-and-c.patch, Etch_UDP_Multi_Session.png,
Etch_UDP_Single_Session.png, Leightweight_Etch_UDP_Server.txt
> Hi,
> attached are a series of patches, which add UDP support to Etch for the Java, C# and
C bindings. It can be used in place of TCP by replacing the url scheme with UDP. The UDP transport
support has been extended with a configurable single session mode, which can be used to run
leightweight servers. Please see the attached file "Leightweight_Etch_Server.txt" for a more
detailed description of this mode. It has been written in the confluence wiki style syntax
and together with the attached images it's suitable for creating a new etch documentation
page. The single session mode has been extended further with a support for one-way method
calls from the server to multiple clients. For more information, please look at the "Signals"
section and the attached patch files.
> The UDP implementation for the C binding is limited to single session mode. It limits
the ability of etch servers to call methods of more than one remote client. The signal extension
can be used to avoid this limitation.
> Below a short description of the attached patches is listed. They can be applied using
the following GIT command: "git am -k --keep-cr --whitespace=nowarn <path>/*.patch"
or can be applied to a clean SVN checkout:  "patch -p1 -i <path>/*.patch".
> * Add property to skip building of the examples:
> 0001-build-add-skip.examples-property.patch
> * Bump dependency to .NET 4.0 and NUnit 2.5.9. The C# UDP implementation is based on
features available in .NET 4.0.
> 0002-binding-csharp-bump-dependencies-to-.NET-4.0-and-NUn.patch
> * Add runtime and build support for the Mono framework (Mono >= 2.10.1, C#).
> 0003-binding-csharp-add-mono-support.patch
> * Make UDP and TCP protocols seamlessly interchangable in Etch (UDP support for C# and
> 0004-binding-csharp-add-udp-transport-support.patch
> 0005-binding-java-add-udp-transport-support.patch
> * Add configurable server single session mode. URL parameter: UdpConnection.singleSession=true
> 0006-binding-csharp-add-udp-single-session-support.patch
> 0007-binding-java-add-udp-single-session-support.patch
> * Add inet_who object to track remote etch clients. Required by the C UDP implementation.
> 0008-binding-c-add-inet_who-object.patch
> * Add UDP transport support to the C binding (single session only). The "UdpConnection.singleSession"
url parameter is not supported and ignored. A patched version of APR (test with version 1.4.2)
is required to send broadcast messages under Linux. The patch has been submitted, but is currently
not integrated (see
> 0009-binding-c-add-UDP-single-session-transport.patch
> * Add signal support for single session mode. See the attached "Leightweight_Etch_Server.txt"
> 0010-compiler-add-Signal-annotation-support.patch
> 0011-binding-csharp-add-Signal-support.patch
> 0012-binding-java-add-Signal-support.patch
> 0013-binding-c-extend-send-sendex-for-etch_who.patch
> 0014-binding-c-add-Signal-support.patch
> * Add signal examples for the C#, Java and C binding.
> 0015-examples-add-signals-example-for-csharp-java-and-c.patch
> Authors:
> Armin Müller <> (itestra GmbH by order of BMW Group Research
and Technology)
> Aleksandar Kanchev <> (itestra GmbH by order of BMW Group Research
and Technology)

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