Free
A free-path vehicle's body: a MovableResource that also carries a manifest.
The second binding of VehicleBodyIfc, and what it demonstrates is that the fleet layer really was substrate-independent rather than merely arranged to look it: this file is the whole of what a fleet needs to run on a free path, and nothing above it changed to accept it.
What a free path does not have, it reports as not having. There is no interference between vehicles, so fracTimeBlocked and numTimesBlocked are registered and stay at zero, and zonesEntered is zero. Those are not missing rows: a free-path model asserts that vehicles do not obstruct one another, and a zero is that assertion showing up in the output where a reader can see it and compare it with a guide path's.
The manifest is here rather than on MovableResource. A movable resource carries whoever seized it, which is the passive protocol's answer and is exactly one entity; carrying several is a fleet's idea, so the fleet's binding is where it belongs. The capacity statistics come with it, with the same names and the same meanings the guide path's have, so the two are comparable.
A ModelElement, and that is not decoration. A body holds state that must be forgotten between replications -- what is aboard it -- and a guide path's body gets that for free by being a model element already. A body written any other way does not, and a manifest that survives a replication starts the next one with a vehicle that has no room and no explanation. Found by the first study to run three replications with loads still aboard when the horizon fell.
Parameters
what actually moves, and what a vehicle seizes to record its commitment
Properties
How much of the room was used, time-weighted, or null for a single-load vehicle.
How long in total it has been unable to proceed. Zero where nothing can block.
How fast it is going now.
How much of the time it was full, or null for a single-load vehicle.
The fraction of time it could not proceed because something was in the way.
True while somebody is moving it rather than it moving itself.
How many loads it can carry at once.
How many loads a loaded move carried, or null for a single-load vehicle.
What is aboard, in the order it came aboard.
Where a waiter suspends while this body is under way.
The mean number aboard, or null for a single-load vehicle.
How fast it is being towed, or null when it is not.
Functions
Installs a veto asked at every decision point of a journey: may it go on past this one?
Sends the vehicle to destination and reports where to wait for it.
This method should be overridden by subclasses that need actions performed to initialize prior to a replication. It is called once before each replication occurs if the model element wants initialization. It is called after beforeReplication() is called