Contents
The Bi-Directional Socket Input/Output Adapter can be used to send and receive data over a socket connection in any format that is needed. The adapter allows the end user to provide code to transform incoming bytes into a tuple and the outgoing data into bytes to send on a socket. Two sample applications are provided.
The CustomDataTransformer sample shows how the adapters work together when linked and using a custom data transformer. When
you run it, data is exchanged between the client and the server, and is parsed and modified as it transits. The data transformer
uses a simple pipe delimited format with a hard coded non-printable separator character. The code in file CustomDataTransformer.java is called by the input and output adapters to perform the data transformations.
The OneServerOneClientNotLinked sample shows how the adapters can work independently. The reader is set up to be a server that only reads in data. The writer is set up to be the client and only sends data. When you run the sample, the writer connects to the reader and sends data. The reader reads in that data and sends that data over an arc to the writer, which in turn sends it back to the read (over the TCP socket). Client and server continue to handshake until a set number of exchanges is reached.
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In the Package Explorer, double-click to open the
CustomDataTransformer.sbappto open the example. Make sure the application is the currently active tab in the EventFlow Editor. -
Click the
Run button. This opens the SB Test/Debug perspective and starts the application.
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For the example, in the Manual Input view select the
ControlClientStream, then enterCONNECTinto the command field, then click to send the tuple. -
In the Application Output view, observe tuples emitted on the
ReadDataServerandReadDataClientoutput streams. -
Select any tuple emitted from either stream and inspect tuple data fields in the Variables view below the output streams to analyze and understand their structure.
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When done, press F9 or click the
Stop Running Application button.
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In the Package Explorer, double-click to open the
OneServerOneClientNotLinked.sbappto open the example. Make sure the application is the currently active tab in the EventFlow Editor. -
Click the
Run button. This opens the SB Test/Debug perspective and starts the application.
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Because the client is configured to connect on startup, the application immediately starts and runs until 250 tuples have been exchanged.
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In the Application Output view, select . Observe that the first tuple comes from the ReaderStatus stream and indicates that the reader is listening on port 50000.
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The second tuple is message from the server on the WriterStatus stream: Connected to localhost:50000
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The third tuple, coming from the ReaderStatus stream, acknowledges the connection. For example, it might say Received connection from 127.0.0.1:60876.
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The remaining 250 tuples are on the ReadData stream and show the client returning data tuples.
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When done, press F9 or click the
Stop Running Application button.
In StreamBase Studio, import this sample with the following steps:
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From the top menu, select → .
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Select
Bi-Directional Socket Input/Output Adapterfrom the StreamBase Standard Adapters category. -
Click OK.
StreamBase Studio creates a single project containing the sample files.
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 the permission problems that can occur when trying to work with the initially installed location of the sample. The default workspace location for this sample is:
studio-workspace/sample_adapter_embedded_bi-directional-socketSee 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/bi-directional-socketSee Default Installation Directories for the default location of studio-workspace on your system.