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From: Susan Cline <home4slc@pacbell.net>
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Subject: StreamScope and the console
Message-Id: <7348B667-F432-4005-AA98-0247626CA9A5@pacbell.net>
Date: Tue, 27 Sep 2016 13:50:49 -0700
To: dev@edgent.apache.org
archived-at: Tue, 27 Sep 2016 20:51:01 -0000

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Hi,

I=E2=80=99m trying to do the following:

If a user creates an application using a DevelopmentProvider display the =
tuples in a hover that are flowing through a StreamScope oplet.

I=E2=80=99ve created a servlet that accepts requests when a user hovers =
over a StreamScope oplet and I can get an instance of a =
StreamScopeMXBean.
But even though I call setEnabled(true) on the StreamScopeMXBean I never =
get any =E2=80=98samples=E2=80=99 when I call =
StreamScopeMXBean.getSamples().

Here is the simple code in the servlet:

			StreamScopeMXBean sScopeBean =3D =
StreamScopeUtil.getStreamScope(jobId, opletId, =
Integer.parseInt(outputPort));
			if (sScopeBean !=3D null) {		=09
				sScopeBean.setEnabled(true);
				System.out.println("is streamScopeMXBean =
enabled? " + sScopeBean.isEnabled());
=09
				String sampleScope =3D =
sScopeBean.getSamples();
				System.out.println("sampleScope: " + =
sampleScope);
				Gson gson =3D new Gson();
		    		=
response.setContentType("application/json");
		    		response.setCharacterEncoding("UTF-8");
		    		=
response.getWriter().write(gson.toJson(sampleScope));
			}

The output to the command line is:

is streamScopeMXBean enabled? true
sampleScope: []

What am I missing?  I think that if a DevelopmentProvider is used =
StreamScope oplets are inserted into the graph, and I should not have to =
do anything else to get the sample?

Thanks,

Susan


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