org.flowable.engine.delegate.variable

Interface VariableAggregator

All Known Implementing Classes:

JsonVariableAggregator

public interface VariableAggregator

An interface that can be used to aggregate multiple variables into a single one based on an aggregation definition.

Author:

Filip Hrisafov

Method Summary

Modifier and Type	Method and Description
Object	aggregateMultiVariables(DelegateExecution execution, List<? extends VariableInstance> instances, VariableAggregatorContext context) Aggregated the provided variable instances into one variable value.
Object	aggregateSingleVariable(DelegateExecution execution, VariableAggregatorContext context) Create a single variable value based on the provided aggregation definition.

Method Detail

aggregateSingleVariable

Object aggregateSingleVariable(DelegateExecution execution,
                               VariableAggregatorContext context)

Create a single variable value based on the provided aggregation definition. This is called after a single child multi instance execution is completed, or an overview for a child multi instance execution is needed.

Parameters:

execution - the delegate execution from where we need to get data from

context - the aggregation context

Returns:

the value for the aggregated variable

aggregateMultiVariables

Object aggregateMultiVariables(DelegateExecution execution,
                               List<? extends VariableInstance> instances,
                               VariableAggregatorContext context)

Aggregated the provided variable instances into one variable value. This is called when a multi instance execution and all its children is complete, or an overview for a multi instance execution is needed.

Parameters:

execution - the delegated execution for which we need to do the aggregation

instances - the variable values that should be aggregated (these variables are created based on the value from aggregateSingleVariable(DelegateExecution, VariableAggregatorContext))

context - the aggregation context

Returns:

the aggregated value