The TIBCO StreamBase® Output Adapter for TIBCO Rendezvous® allows a StreamBase application to publish Tibrv messages to one or more Rendezvous subjects. The adapter is embedded in the StreamBase application and has an input port that receives tuples to be published as Tibrv messages and an output port that emits status tuples. Each tuple enqueued to the adapter's input port causes a single Tibrv message to be published.
The adapter supports all StreamBase data types, including tuples and lists, though lists may not contain elements of type list. Tuple fields of type tuple can be used to send nested Tibrv messages. The schema of adapter's input port is determined by the output port of the upstream operator.
The adapter is configured through several properties set in the adapter's Properties view in StreamBase Studio. The properties include parameters used to connect to the Rendezvous daemon, the input port field containing the subject to publish to, and the default subject value to use if the subject field is null.
This adapter requires access to the JAR file that implements the TIBCO Rendezvous Java API on your system, and any files referenced
by that JAR file. The StreamBase installation kit includes version 8.1.2 of the
tibrvj.jar JAR file. If your site's Rendezvous implementation requires a newer version of that file, copy the file from
tibrvj.jar file, in turn, relies on the
tibrv.dll files for Windows, and for UNIX, on several
.so files in
/usr/tibco/tibrv/lib. These DLL or
.so files are supplied as part of your TIBCO Rendezvous installation, and are not shipped with StreamBase. Make sure these files
are locatable by the TIBCO JAR file on the PATH or by means of the
TIBRV_HOME environment variable.
If you get an error message whose text refers to
Library not found: tibrvj, audit your system for multiple versions of the TIBCO JAR and DLL (or
.so) files. For example, on Windows, you might have an older TIBCO release's DLL files in
C:\Windows\System32, and a newer set in
$TIBRV_HOME\lib. Make sure the StreamBase TIBCO adapter sees a consistent TIBCO implementation, including
tibrv.dll files all from the same TIBCO release.
|Service||The Rendezvous service name. Leave blank to use the default value of 7500.|
|Network||The network interface. Leave blank to use the primary network interface for the host computer.|
|Daemon||The Rendezvous daemon. Leave blank to use the daemon on the local computer listening on the default port.|
|Batch Mode||If enabled, outgoing messages are sent in batches, increasing throughput at the expense of increased latency.|
|Subject Field Name||The name of the input stream field containing the subject value under which to publish the Tibrv message. This field is optional if a Default Subject value is specified, which is used if no subject field exists, or its value is null in a specific input tuple.|
|Default Subject||Contains the subject value under which to publish a Tibrv message if no subject field exists, or its value is null in a specific input tuple.|
|Publish By Field ID||If enabled, the adapter publishes Tibrv fields by field ID. The field ID is derived from the StreamBase field name; StreamBase field _123 would be published with an ID of 123. StreamBase fields not of the form _nnn, where nnn is a decimal number, are published by name.|
|Include Field Name And ID||If enabled, the adapter includes both the field name and ID when publishing a field by ID. The field name is the StreamBase field name with the leading underscore removed.|
|Publish Type Overrides File||The name of a file that can be used to override the default Tibrv type in publishing various StreamBase fields. A template
file is delivered with the adapter's
See the Publish Type Overrides Table below for the correspondence between StreamBase types, default Tibrv types, and valid overrides.
|Generate Unique Tibrv Field Names||When publishing multiple Tibrv fields per StreamBase list field, generate unique Tibrv field names <listfieldname>_0, <listfieldname>_1,
etc. Normally, StreamBase list fields are published using the corresponding Tibrv
|Log Level||Controls the level of verbosity the adapter uses to send notifications to the console. This setting can be higher than the containing application's log level. If set lower, the system log level is used. Available values, in increasing order of verbosity, are: OFF, ERROR, WARN, INFO, DEBUG, TRACE.|
The following table shows, for each StreamBase type, the default Tibrv type, and the valid override values that can be used to publish the StreamBase field using a non-default Tibrv type.
Publish Type Overrides Table
|StreamBase Type||Default Tibrv Type||Valid Overrides|
|blob||OPAQUE||I8ARRAY, U8ARRAY, XML|
|bool||BOOL||I8, U8, I16, U16, I32, U32, I64, U64|
|int||I32||I8, U8, I16, U16, U32, I64, U64|
|long||I64||I8, U8, I16, U16, I32, U32, U64|
|list<bool>||I8ARRAY||BOOL, I8, U8, I16, U16, I32, U32, I64, U64, U8ARRAY, I16ARRAY, U16ARRAY, I32ARRAY, U32ARRAY, I64ARRAY, U64ARRAY|
|list<double>||F64ARRAY||F32, F64, F32ARRAY|
|list<int>||I32ARRAY||I8, U8, I16, U16, I32, U32, I64, U64, I8ARRAY, U8ARRAY, I16ARRAY, U16ARRAY, U32ARRAY, I64ARRAY, U64ARRAY|
|list<long>||I64ARRAY||I8, U8, I16, U16, I32, U32, I64, U64, I8ARRAY, U8ARRAY, I16ARRAY, U16ARRAY, I32ARRAY, U32ARRAY, U64ARRAY|
This section discusses how to use the TIBCO Rendezvous Publishing Output Adapter in a StreamBase application. As shown in the diagram below depicting one of the adapter's sample applications, the publishing adapter has one input and one output port to communicate with the surrounding application.
The TIBCO Rendezvous Publishing Output Adapter's ports are used as follows:
Tibrv Messages: Tuples enqueued on this input port cause the adapter to publish Tibrv messages, one per tuple. The port's schema is derived from the output port of the upstream operator and can contain all StreamBase data types, including lists and (nested) tuples to provide hierarchy in Tibrv messages. Tuple fields are mapped to Tibrv message fields by name. List fields may contain only bool, int, long, and double elements. Fields containing null in the tuple are discarded; no corresponding field is placed in the Tibrv message.
Status: This output port emits status, information, and error tuples. The Status port has the following schema:
type, string: Contains one of the following values describing the type of event that occurred:
object, string: the name of the object associated with the event, such as the Rendezvous transport parameters (service, network, and daemon), the contents of the tuple that wasn't processed successfully, or the name of the adapter that was suspended/resumed.
action, string: the action associated with the event, such as transport created or adapter suspended/resumed.
message, string: A human-readable message string
Add an instance of the adapter to a new StreamBase application as follows:
In StreamBase Studio, create a project, and create an EventFlow application file to host the adapter.
Drag an instance of the TIBCO Rendezvous Publishing Output Adapter from the Operators and Adapter drawer in the Palette view to the canvas.
Connect an input and output stream to the adapter's input and output ports, respectively. Configure the schema of input stream with the fields required in the Tibrv messages to be published.
Select or double-click the adapter icon, and in the Properties view, click Adapter Settings and fill in any desired properties. Either a Subject Field Name or Default Subject must be specified.
The TIBCO Rendezvous Publishing Output adapter uses typecheck messages to help you configure the adapter in your StreamBase application. In particular, the adapter generates typecheck messages when nether a Subject Field Name nor a Default Subject is specified, when a list field in the Tibrv message input port uses an unsupported element type, or the Subject Field is not of type string.
The adapter generates messages on the status port during runtime under various conditions, including:
The adapter creates or fails to create a transport to the Rendezvous daemon during startup.
An error occurs in creating or sending a Tibrv message.
The adapter is suspended or resumed.
When suspended, the TIBCO Rendezvous Subscribing Input Adapter stops processing input tuples.
When resumed, the adapter begins processing input tuples once again.