File Writer Output Adapter Samples

About The Samples

There are two EventFlow modules in this sample, one basic, the other advanced.

The basic adapter sample illustrates the use of the file writer output adapter by taking in a tuple and writing one of its fields contents to a file.

The advanced adapter sample illustrates reading from a sample input file multiple times and writing that data back out in various compression formats.

Running The Basic Sample in StreamBase Studio

  1. In the Package Explorer, double-click to open the FileWriterBasic.sbapp application. Make sure the application is the currently active tab in the EventFlow Editor.

  2. Click the Run button. This opens the SB Test/Debug perspective and starts the application.

  3. In the Manual Output view, switch the Stream to Data, then enter a string value such as 'test', and then click Send Data to send a data tuple to be written to the file. Repeat for as many lines as you wish.

  4. In the Application Output view, observe tuples emitted on the Status output streams indicating actions performed to the file.

  5. In the Manual Output view, switch the Stream to Control, then enter 'Close' into the Command field, and then click Send Data to send a control tuple which will close the current file for writing.

  6. Press F9 or click the Stop Running Application button.

  7. This demo will have now created a file in your project called SampleOut.txt containing the lines of data you submitted.

Running The Advanced Sample in StreamBase Studio

  1. In the Package Explorer, double-click to open the FileWriterAdvanced.sbapp application. Make sure the application is the currently active tab in the EventFlow Editor.

  2. Click the Run button. This opens the SB Test/Debug perspective and starts the application.

  3. In the Application Output view, observe tuples emitted on the Status output streams indicating actions performed to the files.

  4. Press F9 or click the Stop Running Application button.

  5. This demo will have now created multiple files in your project:

    1. Sample.gz - This file is a GZip compressed file created from the SampleIn.txt file.

    2. Sample.gz2 - This file is a BZip2 compressed file created from the SampleIn.txt file.

    3. Sample.zip - This file is a Zip compressed file created from the SampleIn.txt file.

    4. SampleOut.txt - This file is a un-compressed file created from the SampleIn.txt file.

Importing This Sample into StreamBase Studio

In StreamBase Studio, import this sample with the following steps:

  • From the top menu, select FileLoad StreamBase Sample.

  • Select File Writer output adapter from the StreamBase Standard Adapters category.

  • Click OK.

StreamBase Studio creates a single project containing the sample files.

Sample Location

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_adapter_embedded_filewriter

See Default Installation Directories for the 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/adapter/embedded/filewriter

See Default Installation Directories for the default location of studio-workspace on your system.