Full acccess to an object with byteman

[ziuziu]

Is it possible to have full access to an object using byteman so that the instance members values can be change at runtime to enforce certain behaviour.

I've been playing a bit with it, has someone used byteman to mofify objects at runtime?

[adinn]

Hi Albert

Albert Tresens wrote:

Is it possible to have full access to an object using byteman so that the instance members values can be change at runtime to enforce certain behaviour.

I've been playing a bit with it, has someone used byteman to mofify objects at runtime?

Yes, you can update objects at runtime. You can call a setter if it exists or you can even assign a field directly

e.g a rule could reset a boolean field belonging to a trigger class instance as follows

. . .

DO $0.isValid = false;

ENDRULE

Note that Byteman rules are able to update fields even if they are private (this is true assuming you are using the default JDK security policy -- if you set up a more restrcitive policy then it may not work).

regards,

Andrew Dinn

[ziuziu]

Hi Andrew thanks a lot!!

I mange to change the field.

I am now trying to change a field belonging to a trigger class that has a specific ID value.

That is a class ResponseStatus that has a field ID and a field isValid change isValid only for ID=1234

[adinn]

Hi Albert

Albert Tresens wrote:

I am now trying to change a field belonging to a trigger class that has a specific ID value.

That is a class ResponseStatus that has a field ID and a field isValid change isValid only for ID=1234

Well, that ought to be easy. Just place the test 1234 in your rule's IF clause.

RULE example

CLASS ResponseStatus

METHOD myInstanceMethodName

AT ENTRY

IF $0.ID == 1234

DO $0.isValid = false

ENDRULE

regards,

Andrew Dinn