[news.eclipse.technology.memory-analyzer] DTFJ queries

[andrew_johnson@xxxxxxxxxx (Andrew Johnson)]

It is possible to get access to the DTFJ Image and JavaRuntime handles 
when writing MAT queries for dumps from IBM virtual machines.

This is done using the ISnapshot.getSnapshotAddons() call. This API takes 
the class of the object required and returns an instance of that class. 
The DTFJ adapter can return com.ibm.dtfj.image.Image or 
com.ibm.dtfj.java.JavaRuntime objects.

You'll need to add the com.ibm.dtfj.api plug-in in the required plug-ins 
list for your query plug-in so you get access to Image or JavaRuntime.

I haven't done much with this yet, so this information could be subject to 
change if it doesn't work as we would like. Please let me know if this is 
useful.

       Image im = snapshot.getSnapshotAddons(Image.class);
       JavaRuntime jr = snapshot.getSnapshotAddons(JavaRuntime.class);


   /**
    * Get additional JVM information, if available.
    * <p>
    * 
    * @return SnapshotAddons - extended information, e.g. perm info, OoM 
stack
    *         trace info, JVM arguments, etc.
    * @throws SnapshotException
    */
   public <A> A getSnapshotAddons(Class<A> addon) throws 
SnapshotException;