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Chapter 28. Connecting objects


28.1. Connecting Objects

Connecting object connect two elements. There are two main types of Connecting object:

  • Sequence Flow, which connect Flow elements of a Process and define the flow of the execution (transport the token from one element to another)
  • Association Flow, which connect any Process elements but have no execution semantics

28.2. Connecting Objects types

28.2.1. Sequence Flow

A sequence flow represents the transition between two flow elements. It establishes an oriented relationship between activities, events, and gateways, and defines their execution order.

Condition Expression

When this condition evaluates to true, the workflow takes the sequence flow.

If a sequence flow has a gateway element as its source, you need to define a conditional expression that is evaluated before the sequence flow is taken. If evaluated to false, the workflow attempts to switch to another sequence flow. If evaluated to true, the sequence flow is taken.

When defining the condition in Java, make sure to return a boolean value:

return <expression resolving to boolean>;
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Condition Expression Language
You can use either Java, Javascript, MVEL, or Drools to define the condition expression.
Available Variables

When defining a Condition Expression, make sure to call process and global variables. You can also call the kcontext variable, which holds the process instance information.

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