Prefer Interface Segregation (Small, Focused Interfaces)

WarningClean ABAP & Modern Syntax#EC PREF_INTF_SEGREGRemote Enabled

Overview

Prefer interface segregation (small interfaces).

ATC Finding Message: Interface has too many methods; prefer interface segregation

Rationale

Fat interfaces force implementers to depend on methods they do not need and make test mock creation cumbersome. Break large interfaces into small, cohesive, role-based contracts adhering to the Interface Segregation Principle (ISP).

Non-Compliant

INTERFACE lif_everything.
  METHODS: read, write, print, send_email, archive, validate.
ENDINTERFACE.

Compliant

INTERFACE lif_reader.
  METHODS read.
ENDINTERFACE.
INTERFACE lif_writer.
  METHODS write.
ENDINTERFACE.

Configuration & Thresholds

This check can be fine-tuned directly in the ATC Check Variant Editor (CHKV) in Eclipse ADT:

Parameter Name	Data Type	Default Value	Description & Guidance
MAX_METHODS	Integer	5	Maximum number of methods allowed in a single interface (Interface Segregation Principle, default: 5)

Suppression

To suppress findings for this rule, append the pseudo-comment to the statement:

" Standard pseudo-comment:
... "#EC PREF_INTF_SEGREG

" SAP CI_ prefix format:
... "#EC CI_PREF_INTF_SEGREG

Related Rules

• Avoid Exposed Mutable Data in Classes and Interfaces — #EC PUBLIC_ATTR
• Prefer NEW #( ) over CREATE OBJECT — #EC PREF_NEW_OPERATOR
• Declare Constructor in PUBLIC SECTION — #EC PREF_PUB_CTOR

Technical Details

• Native ATC Class: ZCL_SKYLINT_PREF_INTF_SEGREG
• Implementation File: zcl_skylint_pref_intf_segreg.clas.abap