symbiote /
silverstripe-advancedworkflow
Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like WorkflowInstance often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use WorkflowInstance, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 49 | class WorkflowInstance extends DataObject |
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| 50 | { |
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| 51 | private static $db = array( |
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| 52 | 'Title' => 'Varchar(128)', |
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| 53 | 'WorkflowStatus' => "Enum('Active,Paused,Complete,Cancelled','Active')", |
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| 54 | 'TargetClass' => 'Varchar(255)', |
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| 55 | 'TargetID' => 'Int', |
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| 56 | ); |
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| 57 | |||
| 58 | private static $has_one = array( |
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| 59 | 'Definition' => WorkflowDefinition::class, |
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| 60 | 'CurrentAction' => WorkflowActionInstance::class, |
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| 61 | 'Initiator' => Member::class, |
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| 62 | ); |
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| 63 | |||
| 64 | private static $has_many = array( |
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| 65 | 'Actions' => WorkflowActionInstance::class, |
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| 66 | ); |
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| 67 | |||
| 68 | /** |
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| 69 | * The list of users who are responsible for performing the current WorkflowAction |
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| 70 | * |
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| 71 | * @var array |
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| 72 | */ |
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| 73 | private static $many_many = array( |
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| 74 | 'Users' => Member::class, |
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| 75 | 'Groups' => Group::class, |
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| 76 | ); |
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| 77 | |||
| 78 | private static $summary_fields = array( |
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| 79 | 'Title', |
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| 80 | 'WorkflowStatus', |
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| 81 | 'Created' |
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| 82 | ); |
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| 83 | |||
| 84 | private static $default_sort = array( |
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| 85 | '"Created"' => 'DESC' |
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| 86 | ); |
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| 87 | |||
| 88 | /** |
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| 89 | * If set to true, actions that cannot be executed by the user will not show |
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| 90 | * on the frontend (just like the backend). |
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| 91 | * |
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| 92 | * @var boolean |
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| 93 | */ |
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| 94 | private static $hide_disabled_actions_on_frontend = false; |
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| 95 | |||
| 96 | /** |
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| 97 | * Fields to ignore when generating a diff for data objects. |
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| 98 | */ |
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| 99 | private static $diff_ignore_fields = array( |
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| 100 | 'LastEdited', |
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| 101 | 'Created', |
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| 102 | 'workflowService', |
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| 103 | 'ParentID', |
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| 104 | 'Sort', |
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| 105 | 'PublishJobID', |
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| 106 | 'UnPublishJobID' |
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| 107 | ); |
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| 108 | |||
| 109 | private static $table_name = 'WorkflowInstance'; |
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| 110 | |||
| 111 | /** |
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| 112 | * Get the CMS view of the instance. This is used to display the log of |
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| 113 | * this workflow, and options to reassign if the workflow hasn't been |
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| 114 | * finished yet |
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| 115 | * |
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| 116 | * @return FieldList |
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| 117 | */ |
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| 118 | public function getCMSFields() |
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| 170 | |||
| 171 | public function fieldLabels($includerelations = true) |
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| 181 | |||
| 182 | /** |
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| 183 | * See if we've been saved in context of managing the workflow directly |
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| 184 | */ |
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| 185 | public function onBeforeWrite() |
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| 197 | |||
| 198 | /** |
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| 199 | * Update the current state of the workflow |
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| 200 | * |
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| 201 | * Typically, this is triggered by someone modifiying the workflow instance via the modeladmin form |
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| 202 | * side of things when administering things, such as re-assigning or manually approving a stuck workflow |
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| 203 | * |
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| 204 | * Note that this is VERY similar to AdvancedWorkflowExtension::updateworkflow |
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| 205 | * but without the formy bits. These two implementations should PROBABLY |
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| 206 | * be merged |
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| 207 | * |
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| 208 | * @todo refactor with AdvancedWorkflowExtension |
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| 209 | * |
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| 210 | * @param type $data |
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| 211 | * @return |
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| 212 | */ |
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| 213 | public function updateWorkflow($data) |
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| 238 | |||
| 239 | /** |
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| 240 | * Get the target-object that this WorkflowInstance "points" to. |
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| 241 | * |
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| 242 | * Workflows are not restricted to being active on SiteTree objects, |
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| 243 | * so we need to account for being attached to anything. |
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| 244 | * |
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| 245 | * Sets Versioned::set_reading_mode() to allow fetching of Draft _and_ Published |
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| 246 | * content. |
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| 247 | * |
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| 248 | * @param boolean $getLive |
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| 249 | * @return null|DataObject |
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| 250 | */ |
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| 251 | public function getTarget($getLive = false) |
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| 273 | |||
| 274 | /** |
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| 275 | * |
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| 276 | * @param boolean $getLive |
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| 277 | * @see {@link {$this->getTarget()} |
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| 278 | * @return null|DataObject |
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| 279 | */ |
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| 280 | public function Target($getLive = false) |
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| 284 | |||
| 285 | /** |
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| 286 | * Returns the field differences between the older version and current version of Target |
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| 287 | * |
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| 288 | * @return ArrayList |
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| 289 | */ |
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| 290 | public function getTargetDiff() |
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| 302 | |||
| 303 | /** |
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| 304 | * Start a workflow based on a particular definition for a particular object. |
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| 305 | * |
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| 306 | * The object is optional; if not specified, it is assumed that this workflow |
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| 307 | * is simply a task based checklist type of workflow. |
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| 308 | * |
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| 309 | * @param WorkflowDefinition $definition |
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| 310 | * @param DataObject $for |
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| 311 | */ |
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| 312 | public function beginWorkflow(WorkflowDefinition $definition, DataObject $for = null) |
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| 344 | |||
| 345 | /** |
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| 346 | * Execute this workflow. In rare cases this will actually execute all actions, |
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| 347 | * but typically, it will stop and wait for the user to input something |
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| 348 | * |
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| 349 | * The basic process is to get the current action, and see whether it has been finished |
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| 350 | * by some process, if not it attempts to execute it. |
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| 351 | * |
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| 352 | * If it has been finished, we check to see if there's some transitions to follow. If there's |
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| 353 | * only one transition, then we execute that immediately. |
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| 354 | * |
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| 355 | * If there's multiple transitions, we just stop and wait for the user to manually |
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| 356 | * trigger a transition. |
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| 357 | * |
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| 358 | * If there's no transitions, we make the assumption that we've finished the workflow and |
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| 359 | * mark it as such. |
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| 360 | * |
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| 361 | * |
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| 362 | */ |
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| 363 | public function execute() |
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| 411 | |||
| 412 | /** |
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| 413 | * Evaluate all the transitions of an action and determine whether we should |
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| 414 | * follow any of them yet. |
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| 415 | * |
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| 416 | * @param WorkflowActionInstance $action |
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| 417 | * @return WorkflowTransition |
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| 418 | */ |
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| 419 | protected function checkTransitions(WorkflowActionInstance $action) |
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| 428 | |||
| 429 | /** |
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| 430 | * Transitions a workflow to the next step defined by the given transition. |
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| 431 | * |
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| 432 | * After transitioning, the action is 'executed', and next steps |
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| 433 | * determined. |
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| 434 | * |
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| 435 | * @param WorkflowTransition $transition |
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| 436 | */ |
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| 437 | public function performTransition(WorkflowTransition $transition) |
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| 469 | |||
| 470 | /** |
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| 471 | * Returns a list of all Members that are assigned to this instance, either directly or via a group. |
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| 472 | * |
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| 473 | * @todo This could be made more efficient. |
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| 474 | * @return ArrayList |
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| 475 | */ |
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| 476 | View Code Duplication | public function getAssignedMembers() |
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| 490 | |||
| 491 | /** |
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| 492 | * |
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| 493 | * @param Member $member |
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| 494 | * @return boolean |
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| 495 | */ |
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| 496 | public function canView($member = null) |
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| 517 | |||
| 518 | /** |
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| 519 | * |
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| 520 | * @param Member $member |
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| 521 | * @return boolean |
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| 522 | */ |
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| 523 | public function canEdit($member = null) |
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| 532 | |||
| 533 | /** |
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| 534 | * |
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| 535 | * @param Member $member |
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| 536 | * @return boolean |
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| 537 | */ |
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| 538 | public function canDelete($member = null) |
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| 550 | |||
| 551 | /** |
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| 552 | * Checks whether the given user is in the list of users assigned to this |
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| 553 | * workflow |
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| 554 | * |
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| 555 | * @param Member $member |
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| 556 | */ |
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| 557 | protected function userHasAccess($member) |
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| 584 | |||
| 585 | /** |
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| 586 | * Can documents in the current workflow state be edited? |
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| 587 | */ |
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| 588 | public function canEditTarget() |
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| 594 | |||
| 595 | /** |
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| 596 | * Does this action restrict viewing of the document? |
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| 597 | * |
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| 598 | * @return boolean |
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| 599 | */ |
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| 600 | public function canViewTarget() |
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| 608 | |||
| 609 | /** |
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| 610 | * Does this action restrict the publishing of a document? |
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| 611 | * |
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| 612 | * @return boolean |
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| 613 | */ |
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| 614 | public function canPublishTarget() |
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| 620 | |||
| 621 | /** |
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| 622 | * Get the current set of transitions that are valid for the current workflow state, |
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| 623 | * and are available to the current user. |
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| 624 | * |
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| 625 | * @return array |
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| 626 | */ |
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| 627 | public function validTransitions() |
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| 637 | |||
| 638 | /* UI RELATED METHODS */ |
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| 639 | |||
| 640 | /** |
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| 641 | * Gets fields for managing this workflow instance in its current step |
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| 642 | * |
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| 643 | * @return FieldList |
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| 644 | */ |
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| 645 | public function getWorkflowFields() |
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| 661 | |||
| 662 | /** |
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| 663 | * Gets Front-End form fields from current Action |
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| 664 | * |
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| 665 | * @return FieldList |
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| 666 | */ |
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| 667 | public function getFrontEndWorkflowFields() |
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| 676 | |||
| 677 | /** |
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| 678 | * Gets Transitions for display as Front-End Form Actions |
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| 679 | * |
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| 680 | * @return FieldList |
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| 681 | */ |
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| 682 | public function getFrontEndWorkflowActions() |
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| 715 | |||
| 716 | /** |
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| 717 | * Gets Front-End DataObject |
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| 718 | * |
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| 719 | * @return DataObject |
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| 720 | */ |
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| 721 | public function getFrontEndDataObject() |
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| 728 | |||
| 729 | /** |
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| 730 | * Gets Front-End DataObject |
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| 731 | * |
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| 732 | * @return DataObject |
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| 733 | */ |
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| 734 | public function getFrontEndRequiredFields() |
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| 741 | |||
| 742 | public function setFrontendFormRequirements() |
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| 747 | |||
| 748 | public function doFrontEndAction(array $data, Form $form, HTTPRequest $request) |
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| 753 | |||
| 754 | /** |
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| 755 | * We need a way to "associate" an author with this WorkflowInstance and its Target() to see if she is "allowed" |
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| 756 | * to view WorkflowInstances within GridFields |
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| 757 | * @see {@link $this->userHasAccess()} |
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| 758 | * |
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| 759 | * @param number $recordID |
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| 760 | * @param number $userID |
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| 761 | * @param number $wasPublished |
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| 762 | * @return boolean |
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| 763 | */ |
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| 764 | public function getVersionedConnection($recordID, $userID, $wasPublished = 0) |
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| 777 | |||
| 778 | /** |
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| 779 | * Simple method to retrieve the current action, on the current WorkflowInstance |
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| 780 | */ |
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| 781 | public function getCurrentAction() |
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| 794 | |||
| 795 | /** |
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| 796 | * Tells us if $member has had permissions over some part of the current WorkflowInstance. |
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| 797 | * |
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| 798 | * @param $member |
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| 799 | * @return WorkflowAction|boolean |
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| 800 | */ |
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| 801 | public function getMostRecentActionForUser($member = null) |
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| 831 | } |
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| 832 |
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