PlantUML class and activity diagram for Custom Magento 2 Export Model

export_model_example.puml

@startuml

'***********
'play around with this via https://www.planttext.com/
'***********

!theme reddress-darkgreen
skinparam pageMargin 0

package CustomModule {
    class CustomExportModel {
    -attributeCollectionProvider
    +getAttributeCollection()
    +export()
    }
    object KeyClasses #Grey {
        AttributeCollectionProvider
        --
        EntityCollectionFactory
    }
    package Filters {}
    package etc {
        class di_xml {
            FilterProcessorAggregator_Arguments
            Optional Preference to modify the core export model
        }
        class export_xml {
            Declare entity model
            Declare fileFormats
        }
    }
}

package Exporter_Module {
    class CoreExportModel_Override {
    +export()
    }
    note bottom of CoreExportModel_Override
        To drive our logic for custom 'FileFormats'
        Such as json being sent to a restClient
    end note

    package Service {
        Class RestService
    }
    package Model\Export {
        Class CronExport
            package Adapter {
                class json {
                    #_jsonData
                    +writeRow()
                    +getContentType()
                    +getFileExtension()
                    +setHeaderCols()
                    +getContents()
                }
            }
            json <--> CustomExportModel #text:blue : FileFormat $_writer \n aka adapter
        }
        CronExport -> CoreExportModel_Override
        RestService <--> CoreExportModel_Override
}

package Magento_framework_Filesystem {
    namespace Driver {
        Class Driver.File{}
        Class Http{}
        Class Https{}
        Class Zlib{}
    }
    namespace Io {
        Class File{}
        Class Ftp{}
        Class Sftp{}
    }
}
package Magento_ImportExport {
    namespace Controllers {
        class GetFilter {

        }
        class Export {
            #publish()
        }
    }
    package Models {
        class Consumer {
            #writeFile()
        }
        class ExportManagement {

        }
        class CoreExportModel {
            +export()
        }
    }
    package Adminhtml {
        class export_form_before_phtml {
            +JSajax()
        }
        class ExportGui {
            +AttributeGrid
            +Continue_Submit_Button
        }
    }
}
package Magento_ScheduledImportExport {
    class ExportModel {
        +runSchedule()
    }
}
Package RabbitMQ <<Database>> {
    class async_all
}

'Directives
'-------------------
hide empty members

' Activities
'---------------------------------------------------------------------------------

ExportModel::runSchedule --> CoreExportModel_Override::export

export_form_before_phtml::JSajax <--> Controllers.GetFilter
Controllers.GetFilter <--> CustomExportModel::getAttributeCollection

ExportGui::Continue_Submit_Button -> Controllers.Export : <($attributeCollection, $_params)
export_form_before_phtml -> ExportGui::AttributeGrid
note top of export_form_before_phtml
Custom attribute collection fetched
creates the attributeGrid and thus
the filters form for export
end note

Controllers.Export --> RabbitMQ

RabbitMQ -> Consumer
note on link
queue consumer name is
<b>exportProcessor</b>
end note

Consumer <-> ExportManagement
ExportManagement <-> CoreExportModel_Override

CoreExportModel_Override <-> CustomExportModel::export
Consumer::writeFile -> Io
Io -- Driver
@enduml