Introduction

The Sybase Event Stream Processor includes debugging features for locating and fixing problems in your projects.

These features are available through two interfaces: the Event Stream Processor Studio and the esp_client command-line utility. Use the debugging tools during project development, not while the Event Stream Processor is in production mode. The debugging tools are normally disabled since they place a substantial overhead on the Event Stream Processor.

To enable the debugging tools, run the Event Stream Processor in trace mode.

• Trace Mode
  In trace mode, the Event Stream Processor performs extra checks for possible debugging operations and breakpoints, and collects extra information about execution history.
• Step the Event Stream Processor
  Stepping the Event Stream Processor lets you to advance the state of the platform when the system is paused.
• Pause the Event Stream Processor
  While in trace mode, you can issue a pause command to pause the stream processing loop. Pausing the loop allows you to examine the stream in a static state.
• The Stream Processing Loop
  The internal logic of a stream in the Event Stream Processor can be represented as a loop with states that correspond to ways the Event Stream Processor handles data.
• Breakpoints and Exceptions
  The breakpoint function pauses Event Stream Processor if there is a problem with the data model. A breakpoint stops Event Stream Processor and allows the user to troubleshoot the problem.
• Notification of Debugger Events
  You can receive notifications as the Event Stream Processor changes between running and pausing, single-steps, and when the platform hits breakpoints and exceptions.