How do I determine an active server connection in a StreamBase Client?

How do I determine an active server connection in a StreamBase Client?

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Article ID: KB0076361

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Updated On:

Products Versions
TIBCO Streaming -

Description

How do I determine an active server connection in a StreamBase Client?

When a custom-written StreamBase client is not dequeueing tuples, is there a non-blocking way I can query my StreamBaseClient instance to determine if the node is down?

Issue/Introduction

Use StreamBaseClient.status() to check on connection status.

Resolution

Call StreamBaseClient.status().
  • If it returns, the Streaming server is up.
  • If you get a StreamBaseException, it is likely that the Streaming server is not up or accessible at the requested URL.
Note that the status() call makes a synchronous XML-RPC call to the server, so do not use it often, but only when a problem is suspected. Also do not have 1000 clients all calling for status in a short period of time. Calling status() every second from under 20 clients is not expected to be a performance problem for the server.

Additional information: The ServerClosedException is a subtype of StreamBaseNetworkException which is a subtype of StreamBaseException. A catch(StreamBaseException) expression is effective around an enqueue() call.
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