Contents
This sample application takes input from a provided feed simulation. It splits incoming trades into smaller trades of qty = split_size and, if necessary, adds an additional trade for the remainder of qty/split_size. The filter operator is a required part of creating a conditional loop.
Arcs usually take their schemas from upstream operators. But the arc that creates the loop in loop.sbapp requires an explicit schema. As a best practice, when possible, re-use the named schema from the incoming stream (in this
case, InputStream) for the looping arc's schema.
This section describes how to run the sample in UNIX terminal windows or Windows command prompt windows. On Windows, be sure to use the StreamBase Command Prompt from the Start menu as described in the Test/Debug Guide, not the default command prompt.
-
Open three terminal windows on UNIX, or three StreamBase Command Prompts on Windows. In each window, navigate to your Studio workspace copy of the sample.
-
In window 1, launch StreamBase Server on
loop.sbapp:sbd loop.sbapp -
In window 2, dequeue from the running application's output port:
sbc dequeue -
In window 3, start the feed simulation:
sbfeedsim loop-feedsim.sbfs -
Observe the tuples emitted from the
LittleTradesOutstream. -
When done, type the following commands in window 3 to terminate the feed simulation, server, and dequeuer:
Ctrl+C (to terminate the feed simulation)
sbadmin shutdown
In StreamBase Studio, import this sample with the following steps:
-
From the top menu, select → .
-
Type
loopin the search field to narrow the list of choices. -
From the Applications category, select
loop. -
Click OK.
StreamBase Studio creates a project for the sample.
When you load the sample into StreamBase Studio, Studio copies the sample project's files to your Studio workspace, which is normally part of your home directory, with full access rights.
Important
Load this sample in StreamBase Studio, and thereafter use the Studio workspace copy of the sample to run and test it, even when running from the command prompt.
Using the workspace copy of the sample avoids permission problems. The default workspace location for this sample is:
studio-workspace/sample_loopSee Default Installation Directories for the default location of studio-workspace on your system.
In the default TIBCO StreamBase installation, this sample's files are initially installed in:
streambase-install-dir/sample/loopSee Default Installation Directories for the default location of studio-workspace on your system.