opendaylight: what is the purpose of InstructionKey?

Question

I am programming an SDN application using opendaylight. I see that an InstructionKey is required to create an instruction but I don't know where it is used. Any idea what it's use is?

I am always setting it to new InstructionKey(0) but I am not sure if this is correct. Thanks.

score 0 · Accepted Answer · answered Sep 27 '17 at 05:57

0

The InstructionKey is not necessary. This is part of code I have created :

Instruction applyActionsInstruction = new InstructionBuilder()
        .setOrder(0).setInstruction(new ApplyActionsCaseBuilder()
                .setApplyActions(applyActions)
                .build())
        .build();

instructions.add(applyActionsInstruction);

Instructions allInstructions = new InstructionsBuilder()
        .setInstruction(instructions)
        .build();

and it works fine, the Instruction is created even without the key specified.

answered Sep 27 '17 at 05:57

Marievi

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I am not sure why InstructionKey exists in the first place. – LostInTheFrequencyDomain Sep 27 '17 at 15:50
@LostInTheFrequencyDomain it is used as an identifier of the Instruction. – Marievi Sep 28 '17 at 06:09
I figured, but which API uses this key? – LostInTheFrequencyDomain Sep 29 '17 at 21:38
@LostInTheFrequencyDomain what do you mean? – Marievi Oct 01 '17 at 13:42
It is used for identifying the instruction but under what circumstances does one need to identify the instruction uniquely? After I create the instruction with an instruction key, is there some other API that USES the Instruction key? – LostInTheFrequencyDomain Oct 02 '17 at 14:36
I guess there could be a case when you need to associate an Instruction with a switch let's say, e.g. a HashMap of switch and Instruction... or any case where you want to know where you put an Instruction... – Marievi Oct 03 '17 at 06:09

opendaylight: what is the purpose of InstructionKey?

1 Answers1