faq 293109761

Using shipments instead of services

by Carlos Olivos on 2018-06-21 13:39:18

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Hello,

I'm starting to use the freight contribution and I tried to run a simulation using shipments instead of services, but I encoutered that org.matsim.contrib.freight.jsprit.MatsimJspritFactory prompts an error stating "IllegalStateException if shipments are involved". Later I found out in the Java docs that shipments are not yet implemented.

So my question is: has anyone already implemented shipments? If so, where can I find the changements to the code.

Thanks,

Carlos

P.S: I imported MATSim's master to Eclipse via Github and later imported the contribs as Maven projects. So everything I have is version 0.11.

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Comments: 2

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Re: Using shipments instead of services

by Johan W. Joubert on 2018-06-21 14:36:07

Hi Carlos, I don't have an answer/solution, but some context. The freight contrib was fairly quiet for a few years. We are currently working on it (very) actively from TU Berlin, German Aerospace Centre (DLR) and University of Pretoria side. The most active repository is (unfortunately) currently private, but the latest public stuff you will find on the freight-dfg17-mainBranch Git branch of the repository you have.

That said, you're right, my understanding too is that CarrierShipment is not fully implemented/incorporated in the code.

We focus on the receiver side, while DLR is focussing on the shipper side (Carrier was always there). So on our side we just bully the code so that we create a CarrierService even though they represent actual goods/shipments.

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Re: Using shipments instead of services

by Kai Nagel on 2018-06-22 19:13:39

Jsprit (the underlying engine) actually seems to have the functionality at least since v1.7 (see here: https://github.com/graphhopper/jsprit/blob/master/jsprit-examples/src/main/java/com/graphhopper/jsprit/examples/MultipleProductsWithLoadConstraintExample.java) and click yourself through previous versions. The MATSim freight contrib (which is the adapter to MATSim) uses jsprit 1.7.2 both in 0.10.x and in the current release. So in principle, the functionality should be there.

This implies that someone (you?) should try out if it maybe already works. This would entail git-cloning the matsim project, importing it into the IDE, and commenting out the offending line 320 in MatsimJspritFactory.

(Evidently, you could also do it directly in jsprit as in the MultipleProducts... example. But then, possibly, the result would not get translated to the matsim side afterwards. But I don't really know.)