The JDO project does signature checking using reflection on a jar
file. The expected values of reflection are stored in a file that
looks a lot like the signature of the class itself.
Here's a snippet of the signature definition file:
public interface javax.jdo.datastore.JDOConnection {
public Object getNativeConnection();
public void close();
}
public interface javax.jdo.datastore.Sequence {
public String getName();
public Object next();
public void allocate(int additional);
public Object current();
public long nextValue();
public long currentValue();
}
The code is pretty simple and can just be taken as is in source.
http://svn.apache.org/viewcvs.cgi/db/jdo/trunk/tck/src/java/org/apache/jdo/tck/api/SignatureTest.java
The real work is in the file org/apache/jdo/tck/util/signature/
SignatureVerifier.java
Craig
On Dec 5, 2010, at 3:24 AM, Sim IJskes - QCG wrote:
On 05-12-10 02:24, Peter Firmstone wrote:
Sim IJskes - QCG wrote:
Is there a tool that we can use to verify API compatibility? So we
can
make sure we do not call methods that do not exist?
I've been pondering bytecode analysis.
I think thats the only way to do it. Compile to jars and verify
against API specs.
We have just such a tool, have a look at in
com.sun.jini.tool.classdepend
It needs to be extended to include method signatures, currently it
just
One minor detail. It only needs to be extended.
If we don't go for a complete tool, we need to make profiles. The
profile should contain class version range (who knows where these
are documented? jvms only lists until 1.2) method signatures and
access modifiers. Whe can read the signatures from the (runtime)
class files, the class version we specify manually.
To verify we would scan all the bytecode, look for method calls and
verify existance and access.
We would basically recreate the bytecode verifier. I haven't
reserarched how accessible it is in the tools.jar and how easy it
would be to feed it profiles. I also haven't looked at harmony,
which also should have a verifier.
I prefer a tool ready build. :-) Don't mind debugging it.
Gr. Sim
--
QCG, Software voor het MKB, 071-5890970, http://www.qcg.nl
Quality Consultancy Group b.v., Leiderdorp, Kvk Den Haag: 28088397
Craig L Russell
Architect, Oracle
http://db.apache.org/jdo
408 276-5638 mailto:[email protected]
P.S. A good JDO? O, Gasp!
