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On this page
  • Parameters
  • Defining the subflow to be deployed at each iteration
  • Interrupting a loop
  • Handling errors in the loop
  • Usage scenarios of the Do While connector with errors handling
  • "Interrupt loop on error" property enabled and no subflow defined in onException
  • "Interrupt loop on error" property enabled and a subflow defined in onException
  • "Interrupt loop on error" property disabled and no subflow defined in onException
  • "Interrupt loop on error" property disabled and a subflow defined in onException
  • Error during the onException subflow

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  1. Reference guides
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Do While

Discover more about the Do While component and how to use it on the Digibee Integration Platform.

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Last updated 2 months ago

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Do While allows the construction of blocks in loop inside a pipeline. It's part of a set of connectors that work with subflows to execute their functions.

Parameters

Take a look at the configuration parameters for the connector. Parameters supported by are marked with (DB).

Parameter
Description
Default value
Data type

Iteration

Defines the maximum number of times a loop is executed (it's possible to stop the loop before this number is reached).

10

Integer

Timeout

Maximum time the loop must execute.

300000

Integer

Loop Index

If the option is activated, a “loopIndex” property will be inserted in the presented message at each loop iteration and will inform the current iteration index (1, 2, 3, …).

False

Boolean

Interrupt Loop On Error

If the option is activated, an error occurred inside an iteration will cause the loop interruption as a whole. Otherwise, the loop will continue from the next iteration.

True

Boolean

Defining the subflow to be deployed at each iteration

To work with this type of connector, it's important to keep in mind:

  • Subflow defined in the onProcess block: the pipeline defined in this block is deployed at each loop iteration. Therefore, if the loop has 10 iterations, the subflow is executed 10 times.

  • Subflow defined in the onException block: the pipeline defined in this block is deployed whenever a loop iteration results in error.

To define the subflow to be deployed at each iteration, just click on the onProcess icon of the Do While connector:

When clicking on this icon, a subflow will be created (or shown, if it already exists). Then all you have to do is build the desired flow according to the execution needs of each iteration.

The input of this pipeline will be fed with the message that comes before Do While. This will happen in the #1 loop execution. For the other iterations, the presented message will be the final message of the previous iteration and so on. If Loop Index is activated, a loopIndex property will be inserted in the message informing the current iteration.

Interrupting a loop

To interrupt a loop before the maximum number of defined iterations, just inform a "loopBreak: true" property at the end of the iteration. If the property is found, the loop will be broken.

When the loopBreak: true property is used, the connector's output will be empty. To make it easier to locate this property in your flow, we recommend naming the connector "loopBreak". This way, you can quickly identify where the loop was interrupted when analyzing the execution.

Handling errors in the loop

The standard behavior of Do While is to interrupt the loop if an error is found. Errors are atypical situations in the deployment of a pipeline that end up generating a stop. For example, the use of an Assert connector causes an error in the pipeline when the assertion condition isn't met. Other error situations happen when connectors are used with the enabled Fail On Error configuration.

As previously explained, it's possible to define a subflow to handle errors. The definition of this subflow is made through the onException icon of the Do While connector:

The input of this subflow will be fed with an error message, which will inform what happened to the iteration and the index of the iteration (loopIndex) that caused the failure.

{
    "timestamp": <error's timestamp>
    "error": <error message>
    "code": 500
    "loopIndex": <iteration index where the error occurred>
}

Usage scenarios of the Do While connector with errors handling

"Interrupt loop on error" property enabled and no subflow defined in onException

  • The subflow will be immediately interrupted;

  • An error will be thrown from the Do While connector;

  • No other connector will be invoked after Do While.

"Interrupt loop on error" property enabled and a subflow defined in onException

  • The subflow will be immediately interrupted;

  • The subflow defined in onException will be executed and its output will feed the connector that follows Do While;

  • The connector that follows Do While will be invoked.

"Interrupt loop on error" property disabled and no subflow defined in onException

  • The iteration where the error occurred will be interrupted;

  • A standard error message will be informed in the input of the following iteration and the loop will keep being normally executed.

"Interrupt loop on error" property disabled and a subflow defined in onException

  • The iteration where the error occurred will be interrupted;

  • The subflow defined in onException will be executed and its output will feed the following iteration;

  • The loop will keep being normally executed.

Error during the onException subflow

  • The loop will be interrupted;

  • The error will be thrown for the following connector which the Do While connector is associated to;

  • If Do While is in the pipeline main flow, then the pipeline will be interrupted;

  • If Do While is inside a connector that has a subflow, then the onException subflow will be invoked and the error will be informed in this pipeline input.

A way to inform this property is by using the connector, which allows the definition of arbitrary JSONs in the pipeline flow.

JSON Generator
Double Braces expressions