yeah,
thanks alot : )
On 5/18/05, Cameron Skinner <cam@cs.auckland.ac.nz> wrote:
>
> Hi everyone.
>
> A new version of the simulator package is now available. This new
> version includes a large number of significant changes including:
>
> 1) Inclusion of the ResQ Freiburg fire simulator
>
> 2) Inclusion of the librescue development library
>
> 3) Modification of all simulator components to use librescue. The
> various simulators have been greatly simplified by doing this - most are
> only a few small files now.
>
> 4) TCP! All modules now use TCP by default. The kernel will also listen
> for UDP connections on the port specified by the kernel_udp_port
> parameter in config.txt, so you can run your old agents with the new
> kernel.
>
> 5) New port numbers. The default port 6000 was causing problems with
> X11, so the default ports have been changed to 7000, 7001 and 8000 for
> the kernel, gis and kernel UDP port respectively.
>
> 6) New score calculation. Because the new fire simulator allows
> buildings to reignite, a new scoring metric has been devised. It is the
> same as the old one, except that the calculation for unburnt building
> area has changed. Now buildings that are partially burnt contribute to
> the score - previously as soon as a building caught fire it was
> considered to be destroyed.
>
> There are several changes yet to come - they should be ready soon.
>
> 1) 3D viewer will be changed to TCP.
>
> 2) Ambulances will no longer be allowed to load rescue agents (fire
> brigades, police forces and other ambulances).
>
> 3) The position history bug will be fixed - position history will
> include the IDs of all objects traversed by the agent in the previous
> timestep.
>
> 4) Civilian IDs will not be sent at startup.
>
> 5) Probably something else that I've forgotten.
>
> I will send the latest release in another email. Unfortunately there are
> sometimes problems with the mail server here, so if you receive an email
> that says something like "an email for you has been blocked" from an
> address @auckland.ac.nz <http://auckland.ac.nz> then please let me know.
>
> I will also put the latest release on my web page
> (http://www.cs.auckland.ac.nz/~cam) and it will be put on the simulation
> league website.
>
> Please start using the new package and report any bugs you find to
> someone on the technical committee as soon as possible.
>
> Before I forget: The code has been tested using gcc 3.3 and java 1.4. It
> is possible that gcc3.4 will produce warnings or errors, but I don't
> have gcc3.4 on my machine so I can't tell you what the problem (or the
> solution) will be. Hopefully someone else can!
>
> The TCP protocol is much simpler than the UDP one - just send a 32-bit
> integer containing the length of the message, followed by the message
> itself. You don't need to worry about the LongUDP protocol's use of
> magic numbers, sequence numbers and fragmented messages.
>
> Sample TCP implementation in C:
>
> unsigned char* readMessage(int socket) {
> unsigned char buffer[4];
> int received, total;
> total = 0;
> while (total < 4) {
> received = recv(socket,&buffer[total],4-total,0);
> if (received<0) throw "Error";
> total += received;
> }
> int length = buffer[0]<<24 & buffer[1]<<16 & buffer[2]<<8 & buffer[3];
> total = 0;
> unsigned char* result = new unsigned char[length];
> while (total < length) {
> received = recv(socket,&result[total],length-total,0);
> if (received<0) throw "Error";
> total += received;
> }
> return result;
> }
>
> Please don't consider the above a reference implementation - I just
> typed it up now, so it probably won't even compile.
>
> I would recommend using the librescue library for communication rather
> than re-implementing the TCP code - it is likely that the protocol will
> change in future (for example, length fields for properties) and using
> librescue will save you the trouble of making those changes yourself.
>
> There is currently no java implementation of TCP, but if someone feels
> like modifying YabAPI and rescuecore then please do so.
>
> Thanks,
> Cameron.
>
> --
> Cameron Skinner
> Artificial Intelligence Group
> Department of Computer Science
> The University of Auckland
>
> email: cam@cs.auckland.ac.nz
> phone: +64 9 3737599 x82924
> fax: +64 9 3737453
>
> Post:
> Department of Computer Science
> The University of Auckland
> Private Bag 92019
> Auckland
> New Zealand
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>
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