protopeer-general Mailing List for ProtoPeer

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Hey Jinfu,

It should be up again.

Cheers,
Wojtek

On 7/14/11 3:37 AM, Wang Jinfu wrote:
> Hi Everyone,
>
> It seems the protopeer project website below is not accessible now. Does
> anyone know how to fix the problem?
> *
> *
> *
> http://protopeer.epfl.ch*
> *http://protopeer.ent*
> *
> *
> *Best,*
> *Jinfu*
>
>
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Najwieksza baza samochodow nowych i uzywanych
Sprawdz >> http://linkint.pl/f29e3

Hi Everyone,

It seems the protopeer project website below is not accessible now. Does
anyone know how to fix the problem?
*

http://protopeer.epfl.ch*
*http://protopeer.ent*
*
*
*Best,*
*Jinfu*

Hello all,

I tried to turn my application in Protopeer to a multi-threaded version. I created two new threads in every peer to deal with the concurrency of my application. However I have the following exception:

Exception in thread "Thread-548" java.lang.NullPointerException
        at java.util.TreeMap.rotateRight(TreeMap.java:2057)
        at java.util.TreeMap.fixAfterInsertion(TreeMap.java:2089)
        at java.util.TreeMap.put(TreeMap.java:559)
        at java.util.TreeSet.add(TreeSet.java:238)
        at protopeer.time.EventScheduler.enqueueEvent(EventScheduler.java:88)
        at protopeer.time.EventScheduler.enqueueEventArbitrary(EventScheduler.java:63)
        at protopeer.network.delayloss.DelayLossNetworkInterfaceFactory.sendMessage(DelayLossNetworkInterfaceFactory.java:100)
        at protopeer.network.delayloss.DelayLossNetworkInterface.sendMessage(DelayLossNetworkInterface.java:80)
        at protopeer.network.delayloss.DelayLossNetworkInterface.sendMessage(DelayLossNetworkInterface.java:103)
        at protopeer.Peer.sendMessage(Peer.java:283)

I tried to activate the multi-threading option from the configuration file but doesn't seem to help and I also do not see more threads in the process manager created for every Timer. The number of the threads are the same.

Do I miss something during in this effort?

Thank you,

Evangelos

Evangelos Pournaras BSc MSc 
	Ph.D. Candidate on Autonomic & Distributed Systems
	Section of Systems Engineering, Dept. of Multi-actor System,
   	Delft University of Technology
	e.p...@tu...
	http://www.tudelft.nl/epournaras

Hey Juan,

Here is an example you could use:
http://dl.dropbox.com/u/516265/liverun_example.tgz

It's the Commander example from the tutorial:
http://protopeer.epfl.ch/wiki/IntroTutorial
but implemented as a live run.

To compile it, run
%ant clean
%ant

and then
%./launch_all.sh

It will spawn 11 peers, each binding to some port on 127.0.0.1 that will 
run a flood of CommandMessages just like in the original tutorial. Each 
peer will tell you on the stdout what messages it receives and sends. 
You can see the TTL in  the messages gradually decrease.

Hope this will be enough to get you started.

Unfortunately, everyone writes their highly customized scripts for live 
deployment of the apps, there is no silver bullet solution that would 
work for everyone. The parshell tool helps a lot, though, especially 
with large scale deployments like on the PlanetLab:
http://protopeer.epfl.ch/wiki/ParShell

Cheers,
W.

On 13/12/2010 20:33, Juan López wrote:
> Hello!
>
> Does anyone have a LiveExperiment example that I can use as an initial
> template? I have looked around the repo but I have only found tests
> using the Mina layer but not the LiveExperiment and Peer classes.
>
> Kind regards,
>
>      Juan
>
>
>
> ------------------------------------------------------------------------------
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Hello!

Does anyone have a LiveExperiment example that I can use as an initial
template? I have looked around the repo but I have only found tests using
the Mina layer but not the LiveExperiment and Peer classes.

Kind regards,

    Juan

fil...@gm...
thanks

-- 
FilipeAlvesFerreira#4(1942)

Hello everyone,

I just want to announce that I uploaded a protopeer library for the 
simulation of BitTorrent-based file-sharing and video-on-demand networks 
to the apps-folder of the protopeer repository. The library is based on 
v0.93 of protopeer. It was developed and is used in the EU FP7 project 
SmoothIt (http://www.smoothit.org).

An overview and a short documentation of the library can be found in the 
wiki (http://protopeer.epfl.ch/wiki/BitTorrent).

Please feel free to send comments to the protopeer mailing list and/or 
provide improvements for the code.

Best regards,
Frank

-- 
Dipl.-Inform. Frank Lehrieder
University of Wuerzburg,
Institute of Computer Science,
Chair of Distributed Systems (Informatik III),
Am Hubland, 97074 Wuerzburg, Germany

Tel: +49 931 31-86651
Fax: +49 931 31-86632
leh...@in...
http://www3.informatik.uni-wuerzburg.de/staff/lehrieder/

The Clock, Time and the NetworkInterface were dependent on the Peer. 
This made it tricky to write alternative implementations of the Peer or 
building anything on top of the bare Time and Net APIs.

To fix that, the Clock, Time and the NetworkInterface now use the empty 
interface ExecutionContext in place of the Peer.

Commited to 0.92.

Change log:

- hostPeer, tlsPeer in Clock, Timer, NetworkInterface now replaced with 
the ExecutionContext
- Peer implements ExecutionContext
- VerbosePatternLayout now uses the ExecutionContext.toString() in the logs
- Peer.toString() now prints the basic Peer properties

Cheers,
W.

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Hello Wojciech,

Wojciech Galuba pisze:
> Hi,
> 
> The Peer class was never intended to have multiple interfaces. The Peer 
> exposes only a single network interface to the applications (peerlets) 
> running on the peer.
> The "network interface" name might be a bit misleading since it's not 
> like a eth0 or wlan0 ;) It's a message passing interface.
> 
> I'm not sure what exactly is the goal here, but as Frank mentioned in 
> one of his posts, modeling routing sounds like something that should be 
> done at the lower layer in the ProtoPeer architecture, i.e. at the 
> network model layer (NetworkInterface, NetworkInterfaceFactory, 
> Topology) instead of at the application layer (Peer, Peerlets).
> 

In my project Topology is handling the physical topology, while routers 
are handling the routing. That is because every router has to take a 
decision on where to send a packet. Putting all routing tables to 
customize routing into one class doesn't sound like a good idea to me.

> The flow-based network model is probably the right place to implement 
> this type of stuff, more specifically, you could try to subclass the 
> Topology class to have more control over routing.
> 

Already done :)

> Another way to do that would be to implement a simple NetworkInterface 
> which would internally be using multiple NetworkInterfaces and do the 
> "routing". In a sense, it would emulate a multi-home node, but to the 
> application it would still appear as a single interface.
> 
> The advantage of doing all this at a lower layer is that you can then 
> simply take a BitTorrent implementation (in ProtoPeer) and run it on top 
> of your network model, to see what ASes the data crosses. If you go for 
> the multi-interface Peer it might break the current applications which 
> are designed to work with the single-interface Peer. We would need to 
> considerably rework the class hierarchy to avoid that, which sounds like 
> effort ;)
> 

This doesn't have to be much effort. Adding a superclass of Peer, lets 
call it "NetworkingElement" would not change existing applications. 
Methods like NetworkInterface.setHostPeer(Peer hostPeer) whould just 
change to NetworkInterface.setHostPeer(NetworkingElement element).
This would allow introduction of other types of elements that use 
ProtoPeer framework like Peers do, but are not Peers.

Krzysiek

Hi,

The Peer class was never intended to have multiple interfaces. The Peer 
exposes only a single network interface to the applications (peerlets) 
running on the peer.
The "network interface" name might be a bit misleading since it's not 
like a eth0 or wlan0 ;) It's a message passing interface.

I'm not sure what exactly is the goal here, but as Frank mentioned in 
one of his posts, modeling routing sounds like something that should be 
done at the lower layer in the ProtoPeer architecture, i.e. at the 
network model layer (NetworkInterface, NetworkInterfaceFactory, 
Topology) instead of at the application layer (Peer, Peerlets).

The flow-based network model is probably the right place to implement 
this type of stuff, more specifically, you could try to subclass the 
Topology class to have more control over routing.

Another way to do that would be to implement a simple NetworkInterface 
which would internally be using multiple NetworkInterfaces and do the 
"routing". In a sense, it would emulate a multi-home node, but to the 
application it would still appear as a single interface.

The advantage of doing all this at a lower layer is that you can then 
simply take a BitTorrent implementation (in ProtoPeer) and run it on top 
of your network model, to see what ASes the data crosses. If you go for 
the multi-interface Peer it might break the current applications which 
are designed to work with the single-interface Peer. We would need to 
considerably rework the class hierarchy to avoid that, which sounds like 
effort ;)

Cheers,
Wojtek

> Hello,
> 
> I'm working on intra-AS simulation in ProtoPeer. I've been creating some 
> new classes and working with already existing ones.
> My major suggestion it that it would be nice to have a superclass of 
> Peer to use it in functions like 
> protopeer.network.NetworkInterface.setHostPeer(Peer hostPeer). Now It 
> takes a Peer as a parameter which means that I cannot pass my object 
> called Router (which cannot extend Peer because it has different 
> functionality, but has multiple interfaces).
> 
> I would also like to ask if anyone has come accross a simple (single 
> area) OSPF implementation in Java that I could use for ProtoPeer (or 
> maybe other, simple routing protocol).
> 
> Best regards,
> Krzysztof
> 
> ------------------------------------------------------------------------------
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----------------------------------------------------------------------
Afera Hazardowa- O co tu chodzi?
Sprawdz >>> http://link.interia.pl/f238e

Hello,

I'm working on intra-AS simulation in ProtoPeer. I've been creating some 
new classes and working with already existing ones.
My major suggestion it that it would be nice to have a superclass of 
Peer to use it in functions like 
protopeer.network.NetworkInterface.setHostPeer(Peer hostPeer). Now It 
takes a Peer as a parameter which means that I cannot pass my object 
called Router (which cannot extend Peer because it has different 
functionality, but has multiple interfaces).

I would also like to ask if anyone has come accross a simple (single 
area) OSPF implementation in Java that I could use for ProtoPeer (or 
maybe other, simple routing protocol).

Best regards,
Krzysztof

Dear Krzysztof,

I'd implement that without multi-interface peers because routing (on a 
"physical level", i.e., which links to use) is part of the network model 
and not part of the application layer. It is the intention of the 
Topology class to do that. Therefore, you are right, the topology will 
control that. I'd subclass this Topology class so that it knows which 
links are used from a given source to destination in your specific 
scenario. The flow-based network model allocates the required capacity 
then automatically.

Kind regards,
Frank

Krzysztof Frukacz schrieb:
> Hallo,
>
> I would like to create a model in ProtoPeer that will also take internal 
> AS links into consideration. I don't want to consider core network 
> overdimensioned like the existing models. I was thinking about creating 
> a new class that would act as a router and work similar to 
> "multi-interface Peer".
> As far as I see it Topology class will still have to control all the 
> routing.
> Do you have any suggestions on how to make it work right?
>
> Best regards,
> Krzysztof
>
> ------------------------------------------------------------------------------
> Come build with us! The BlackBerry&reg; Developer Conference in SF, CA
> is the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay 
> ahead of the curve. Join us from November 9&#45;12, 2009. Register now&#33;
> http://p.sf.net/sfu/devconf
> _______________________________________________
> ProtoPeer-general mailing list
> Pro...@li...
> https://lists.sourceforge.net/lists/listinfo/protopeer-general
>   

-- 
Dipl.-Inform. Frank Lehrieder
University of Wuerzburg,
Institute of Computer Science,
Chair of Distributed Systems (Informatik III),
Am Hubland, 97074 Wuerzburg, Germany

Tel: +49 931 31-86651
Fax: +49 931 888-6632
leh...@in...
http://www3.informatik.uni-wuerzburg.de/staff/lehrieder/

Hallo,

I would like to create a model in ProtoPeer that will also take internal 
AS links into consideration. I don't want to consider core network 
overdimensioned like the existing models. I was thinking about creating 
a new class that would act as a router and work similar to 
"multi-interface Peer".
As far as I see it Topology class will still have to control all the 
routing.
Do you have any suggestions on how to make it work right?

Best regards,
Krzysztof

Dear Krzysztof,
> Do you have any examples on the flow-based model application 
> implementation?
A tutorial-like introduction to the flow-based network model is provided 
at http://protopeer.epfl.ch/wiki/FlowBasedNetworkModel
It contains some small example code fragments and gives recommendations 
on how to use and adjust it to your needs.
> As far as I can see I need at least to create my own implementation of 
> Topology class. Is this where all the routing (choosing the path by 
> getLinks function) should take place?
Yes, exactly. You can, for example, create a multi-network topology and 
connect the different networks via links (class 
protopeer.network.flowbased.Link). As you mentioned, this is the task of 
the "Topology" which you have to extend for this purpose. Then, you can 
attach the TransmittedDataMeter (same package) to the links to measure 
the amount of data transmitted over them. For the evaluation, you need 
to call the method "evaluatePeriod()" which returns the amount of data 
transmitted since the last call of this method.
> Is there any problem with applying the flow-based model for intra-AS 
> traffic?
No, this should work "out-of-the-box".

Kind regards,
Frank
>
> Best regards,
> Krzysztof

-- 
Dipl.-Inform. Frank Lehrieder
University of Wuerzburg,
Institute of Computer Science,
Chair of Distributed Systems (Informatik III),
Am Hubland, 97074 Wuerzburg, Germany

Tel: +49 931 31-86651
Fax: +49 931 888-6632
leh...@in...
http://www3.informatik.uni-wuerzburg.de/staff/lehrieder/

Wojciech Galuba pisze:
> To simulate inter-AS networking you need to use the flow-based model:
> http://protopeer.epfl.ch/wiki/FlowBasedNetworkModel
> 
> Frank Lehrieder (CCed) was modeling inter-AS connectivity and various 
> topologies in this paper:
> http://phobos.informatik.uni-wuerzburg.de/TR/tr459.pdf
> 
> He might be able to answer your questions better.
> 
> Cheers,
> Wojtek
> 
> 

Hello,

Thank you for your help.
Do you have any examples on the flow-based model application implementation?
As far as I can see I need at least to create my own implementation of 
Topology class. Is this where all the routing (choosing the path by 
getLinks function) should take place?
Is there any problem with applying the flow-based model for intra-AS 
traffic?

Best regards,
Krzysztof

To simulate inter-AS networking you need to use the flow-based model:
http://protopeer.epfl.ch/wiki/FlowBasedNetworkModel

Frank Lehrieder (CCed) was modeling inter-AS connectivity and various 
topologies in this paper:
http://phobos.informatik.uni-wuerzburg.de/TR/tr459.pdf

He might be able to answer your questions better.

Cheers,
Wojtek

> Hello,
> 
> I would like to use Protopeer to measure network traffic inside and 
> between aoutonomouns systems regarding where peers are located.
> 
> I am looking through the protopeer code and I need to ask this question:
> Can I set that one peer is in one Autonomouns System/Network and another 
> one is in another?
> Can I specify what peers are connected to what networks and test 
> throughputs between those networks/autonomouns systems?
> In other words:
> Do I have any control on the network topology and Autonomous Systems 
> connections?
> 
> Thanks for all help,
> Krzysztof
> 
> 
> 
> ------------------------------------------------------------------------------
> Come build with us! The BlackBerry&reg; Developer Conference in SF, CA
> is the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay 
> ahead of the curve. Join us from November 9&#45;12, 2009. Register now&#33;
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> 

----------------------------------------------------------------------
Kawalerka za 79 000 zl!
Sprawdz >>> http://link.interia.pl/f2348

Hello,

I would like to use Protopeer to measure network traffic inside and 
between aoutonomouns systems regarding where peers are located.

I am looking through the protopeer code and I need to ask this question:
Can I set that one peer is in one Autonomouns System/Network and another 
one is in another?
Can I specify what peers are connected to what networks and test 
throughputs between those networks/autonomouns systems?
In other words:
Do I have any control on the network topology and Autonomous Systems 
connections?

Thanks for all help,
Krzysztof

Hi,

Thanks for giving ProtoPeer a try :)

 > First is a bug which appears when you just change the logging level 
in log4j configuration to debug. In class protopeer.util.quantities.Time 
line 121 throws NPE, because object 'time' is null. It is never 
initialized in class protopeer.time.Event.
Looks serious enough, good catch.
Can you please post the full stack trace?
(or better yet, a patch ;)

Re: the debug mode - usually running the whole protopeer in debug under 
log4j generates a *lot* of output so typically you only enable debug for 
the classes you are interested in.

 > Second problem is that I can't find a description that would describe 
how the peer neighors are chosen in the commander example. Nor I can 
find a description on how should I define my own peers' neighbors.
That's not documented, but this is done via the 
protopeer.servers.bootstrap.RingTopologyGenerator
class which is used by the BootstrapServer.

RingTopologyGenerator implements 
protopeer.servers.bootstrap.TopologyGenerator, you can provide your own 
implementation of that interface. The BootstrapServer will use it to 
wire the peers into whatever graph you like.

This needs documentation, I'll try to do that next week (traveling right 
now).

Also, it would be great to hear what were your experiences going through 
the tutorial and getting started with ProtoPeer so that we can improve 
the docs.

Thanks a lot,
Wojtek

----------------------------------------------------------------------
Kawalerka za 79 000 zl!
Sprawdz >>> http://link.interia.pl/f2348

Hello,

My first mail here, so here it goes...
I've started using Protopeer to create a network traffic testing 
project. I have run into two problems:

First is a bug which appears when you just change the logging level in 
log4j configuration to debug. In class protopeer.util.quantities.Time 
line 121 throws NPE, because object 'time' is null. It is never 
initialized in class protopeer.time.Event.

Second problem is that I can't find a description that would describe 
how the peer neighors are chosen in the commander example. Nor I can 
find a description on how should I define my own peers' neighbors.

Best ragards,
Krzysztof

Hello everyone,

I have a question. I would like to keep track of the neighbors,  
examine the global topology and maybe visualize it with a  
visualization tool. What is the best practice? I have thought of 2  
solutions:

1) Pass a "global tracking object" in the constructor of the peerlets  
in the defined experiments. I believe that this solution is not the  
best as it may work only in the single machine scenario.

2) Use the measurement infrastructure. The question is the following:  
How can i track the neighbors? Measurement infrastructure only defines  
numerical values. i could use network address as a tag but i do not  
know what happens with the fingers that are the neighbors of a  
specific tag (network address).

Could you provide a solution for the above problems or propose  
something alternative?

Thank you.

Evangelos Pournaras

Hi Ervis,

If you are using the BootstrapClient, the peer identifier is initialized 
when the BootstrapClient is initialized from the current network address 
of the peer. But you can also change the peer identifier yourself either 
by supplying your own PeerIdentifierGenerator  in the BoostrapClient 
constructor or by calling getPeer().setIdentifier() from your peerlets.

Cheers,
Wojtek

> Hello all
>  
> I don´t know if you have dealed with this before but i found (i could be 
> wrong) that the Ring position of all peers is 0. for example in the 
> booststrapserver when the core peers are initialized i tried to print 
> the ring position of the peers and is 0.
>  
> I would like to set my own ring identifiers to the peers for the chord 
> protocol. Any idea how to do this ?
>  
> Thanks a lot
>  
> Ervis.
>  
> 
> 
> 
> ------------------------------------------------------------------------
> 
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Hi Ervis,

If you are using the BootstrapClient, the peer identifier is initialized 
when the BootstrapClient is initialized from the current network address 
of the peer. But you can also change the peer identifier yourself either 
by supplying your own PeerIdentifierGenerator  in the BoostrapClient 
constructor or by calling getPeer().setIdentifier() from your peerlets.

Cheers,
Wojtek

> Hello all
>  
> I don´t know if you have dealed with this before but i found (i could be 
> wrong) that the Ring position of all peers is 0. for example in the 
> booststrapserver when the core peers are initialized i tried to print 
> the ring position of the peers and is 0.
>  
> I would like to set my own ring identifiers to the peers for the chord 
> protocol. Any idea how to do this ?
>  
> Thanks a lot
>  
> Ervis.
>  
> 
> 
> 
> ------------------------------------------------------------------------
> 
> ------------------------------------------------------------------------------
> Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT 
> is a gathering of tech-side developers & brand creativity professionals. Meet
> the minds behind Google Creative Lab, Visual Complexity, Processing, & 
> iPhoneDevCamp as they present alongside digital heavyweights like Barbarian 
> Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com 
> 
> 
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Hello all

I don´t know if you have dealed with this before but i found (i could be wrong) that the Ring position of all peers is 0. for example in the booststrapserver when the core peers are initialized i tried to print the ring position of the peers and is 0. 

I would like to set my own ring identifiers to the peers for the chord protocol. Any idea how to do this ?

Thanks a lot

Ervis.

Hi,

Two timers would be the way to go (esp. if the events are independent).

Cheers,
Wojtek

> Hello all,
> 
> I have a question of scheduling some events inside a peerlet. Actually  
> i have 2 independent events that must be triggered continuously every  
> amount of time. How can i implement this in Protopeer? Should i use  
> two timers and call the timeExpired as in the Commander Example or use  
> a single one with more listeners?
> 
> Thank you in advance.
> 
> Evangelos Pournaras 
> 
> ------------------------------------------------------------------------------
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