Open topic with navigation

TIBCO BusinessEvents® Enterprise Edition 6.3.1

# Starts With Clause

A pattern describes a sequence of events, beginning with the `starts with` event, followed by each `then` event, in the order specified. The `starts with` clause is where the actual event sequence or pattern is described. For the pattern to succeed, all the events must be received according to the specified order (and any additional time constraints).

Only events listed in the `using` clause can be used. You specify the event sequence or pattern using the event aliases, to indicate the absence or occurrence of events in the sequence. Use `then` as the conjunction, for example:

    starts with a then b then c

In the simplest case, the order in which the events must occur is signified by the order in which they are specified in the clause. However you can specify the ordering in a variety of ways. You can create sub-clauses and sub-patterns to describe constraints such as the number of event occurrences and the interval between them. To indicate a sub-pattern, wrap the event sequence in parentheses: `(``sub-pattern``)`.

Bind variables begin with the dollar sign (`$`). The value is provided at deploy time. See Create the Pattern String.

## Items Syntax

## Then Syntax

## Alias List Syntax

## Sub-pattern Syntax

## Starts With Sub-clause Examples

    starts with a
    starts with a then b
    starts with a then any one (a, b) then all (a, b)
    starts with a then ( (a then b) )
    starts with a then within 10 milliseconds | seconds | minutes | hours | days b
    starts with a then repeat 10 to 20 times a
    starts with a then repeat $intParam2 to $intParam3 times b
    starts with a then after $longParam minutes
    starts with a then all ( (a then b), b )

## Then Sub-clause Examples

    then any one (a, b)
    then all (a, b)
    then within 10 milliseconds
    then repeat 10 to 20 times a
    then repeat $intParam2 to $intParam3 times b
    then after $longParam minutes
    then all ( (a then b), b )

As shown in the example, a nested sub-pattern is surrounded by parentheses.

Did you find this helpful?

YesNo
Great!
Thanks for taking the time to give us some feedback.
Sorry about that

Why wasn't this helpful? (check all that apply)

Could not find what I was looking for
Instructions confusing or unclear
Instructions did not work

Want to tell us more?

Please select at least one option or provide details about the issue!!

Error occurred while submitting feedback.

Error2 occurred while submitting feedback.

TIBCO BusinessEvents® Enterprise Edition

Copyright © 2004-2024. Cloud Software Group, Inc. All Rights Reserved.