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Exceptions & Constants

Stable API

Classes on this page are marked @api and are guaranteed backward compatible in the 1.x release line. See the BC Policy for details.

Exception classes for error handling and constant classes for well-known string values used across the FlowDrop system.

Overview

Class Type Description
FlowDropException class Base exception for all FlowDrop errors.
NodeProcessingException class Thrown when a node processor encounters a runtime error during execution.
EntityProcessingException class Thrown when entity operations fail during node processing.
InvalidNodeConfigurationException class Thrown when a node processor receives invalid configuration or parameters.
PortDirection final class Constants for port direction identifiers.
EdgeKeys final class Constants for workflow edge metadata keys.

FlowDropException

Namespace: Drupal\flowdrop\Exception
Type: class
Extends: RuntimeException
Source: src/Exception/FlowDropException.php

Base exception for all FlowDrop errors.

All domain-specific FlowDrop exceptions should extend this class so consumers can catch FlowDropException to handle any FlowDrop error.

NodeProcessingException

Namespace: Drupal\flowdrop\Exception
Type: class
Extends: FlowDropException
Source: src/Exception/NodeProcessingException.php

Thrown when a node processor encounters a runtime error during execution.

Examples: HTTP request failure, external service error, or any unrecoverable error during the process() method of a node processor.

EntityProcessingException

Namespace: Drupal\flowdrop\Exception
Type: class
Extends: FlowDropException
Source: src/Exception/EntityProcessingException.php

Thrown when entity operations fail during node processing.

Examples: entity not found, bundle mismatch, entity save failure, or invalid entity type.

InvalidNodeConfigurationException

Namespace: Drupal\flowdrop\Exception
Type: class
Extends: FlowDropException
Source: src/Exception/InvalidNodeConfigurationException.php

Thrown when a node processor receives invalid configuration or parameters.

Examples: missing required parameters, invalid URL, unknown operator, unsupported entity type, or any parameter validation failure during node processing.

PortDirection

Namespace: Drupal\flowdrop\Constants
Type: final class
Source: src/Constants/PortDirection.php

Constants for port direction identifiers.

Used in workflow edge DTOs, node type managers, and job generation to identify input/output port directions.

Constants

Constant Value Description
INPUT "input"
OUTPUT "output"
INPUTS "inputs"
OUTPUTS "outputs"

EdgeKeys

Namespace: Drupal\flowdrop\Constants
Type: final class
Source: src/Constants/EdgeKeys.php

Constants for workflow edge metadata keys.

Used across workflow DTOs, job generation, and pipeline services for edge connection data.

Constants

Constant Value Description
SOURCE_HANDLE "sourceHandle"
TARGET_HANDLE "targetHandle"
IS_TRIGGER "is_trigger"
IS_LOOPBACK "is_loopback"
BRANCH_NAME "branch_name"
SOURCE "source"
TARGET "target"
EDGE_ID "edge_id"

See Also

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