Complex classes like Search 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 Search, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
||
| 35 | class Search |
||
| 36 | { |
||
| 37 | /** |
||
| 38 | * If you don’t need to track the total number of hits at all you can improve |
||
| 39 | * query times by setting this option to false. Defaults to true. |
||
| 40 | * |
||
| 41 | * @var bool |
||
| 42 | */ |
||
| 43 | private $trackTotalHits; |
||
| 44 | |||
| 45 | /** |
||
| 46 | * To retrieve hits from a certain offset. Defaults to 0. |
||
| 47 | * |
||
| 48 | * @var int |
||
| 49 | */ |
||
| 50 | private $from; |
||
| 51 | |||
| 52 | /** |
||
| 53 | * The number of hits to return. Defaults to 10. If you do not care about getting some |
||
| 54 | * hits back but only about the number of matches and/or aggregations, setting the value |
||
| 55 | * to 0 will help performance. |
||
| 56 | * |
||
| 57 | * @var int |
||
| 58 | */ |
||
| 59 | private $size; |
||
| 60 | |||
| 61 | /** |
||
| 62 | * The maximum number of documents to collect for each shard, upon reaching which the query execution will terminate early. |
||
| 63 | * |
||
| 64 | * @var integer |
||
| 65 | */ |
||
| 66 | private $terminateAfter; |
||
| 67 | |||
| 68 | /** |
||
| 69 | * Explicit timeout for each search request. Defaults to no timeout. |
||
| 70 | * |
||
| 71 | * @var time units |
||
| 72 | */ |
||
| 73 | private $timeout; |
||
| 74 | |||
| 75 | /** |
||
| 76 | * Allows to control how the _source field is returned with every hit. By default |
||
| 77 | * operations return the contents of the _source field unless you have used the |
||
| 78 | * stored_fields parameter or if the _source field is disabled. |
||
| 79 | * |
||
| 80 | * @var bool |
||
| 81 | */ |
||
| 82 | private $source; |
||
| 83 | |||
| 84 | /** |
||
| 85 | * Allows to selectively load specific stored fields for each document represented by a search hit. |
||
| 86 | * |
||
| 87 | * @var array |
||
| 88 | */ |
||
| 89 | private $storedFields; |
||
| 90 | |||
| 91 | /** |
||
| 92 | * Allows to return a script evaluation (based on different fields) for each hit. |
||
| 93 | * Script fields can work on fields that are not stored, and allow to return custom |
||
| 94 | * values to be returned (the evaluated value of the script). Script fields can |
||
| 95 | * also access the actual _source document indexed and extract specific elements |
||
| 96 | * to be returned from it (can be an "object" type). |
||
| 97 | * |
||
| 98 | * @var array |
||
| 99 | */ |
||
| 100 | private $scriptFields; |
||
| 101 | |||
| 102 | /** |
||
| 103 | * Allows to return the doc value representation of a field for each hit. Doc value |
||
| 104 | * fields can work on fields that are not stored. Note that if the fields parameter |
||
| 105 | * specifies fields without docvalues it will try to load the value from the fielddata |
||
| 106 | * cache causing the terms for that field to be loaded to memory (cached), which will |
||
| 107 | * result in more memory consumption. |
||
| 108 | * |
||
| 109 | * @var array |
||
| 110 | */ |
||
| 111 | private $docValueFields; |
||
| 112 | |||
| 113 | /** |
||
| 114 | * Enables explanation for each hit on how its score was computed. |
||
| 115 | * |
||
| 116 | * @var bool |
||
| 117 | */ |
||
| 118 | private $explain; |
||
| 119 | |||
| 120 | /** |
||
| 121 | * Returns a version for each search hit. |
||
| 122 | * |
||
| 123 | * @var bool |
||
| 124 | */ |
||
| 125 | private $version; |
||
| 126 | |||
| 127 | /** |
||
| 128 | * Allows to configure different boost level per index when searching across more |
||
| 129 | * than one indices. This is very handy when hits coming from one index matter more |
||
| 130 | * than hits coming from another index (think social graph where each user has an index). |
||
| 131 | * |
||
| 132 | * @var array |
||
| 133 | */ |
||
| 134 | private $indicesBoost; |
||
| 135 | |||
| 136 | /** |
||
| 137 | * Exclude documents which have a _score less than the minimum specified in min_score. |
||
| 138 | * |
||
| 139 | * @var int |
||
| 140 | */ |
||
| 141 | private $minScore; |
||
| 142 | |||
| 143 | /** |
||
| 144 | * Pagination of results can be done by using the from and size but the cost becomes |
||
| 145 | * prohibitive when the deep pagination is reached. The index.max_result_window which |
||
| 146 | * defaults to 10,000 is a safeguard, search requests take heap memory and time |
||
| 147 | * proportional to from + size. The Scroll api is recommended for efficient deep |
||
| 148 | * scrolling but scroll contexts are costly and it is not recommended to use it for |
||
| 149 | * real time user requests. The search_after parameter circumvents this problem by |
||
| 150 | * providing a live cursor. The idea is to use the results from the previous page to |
||
| 151 | * help the retrieval of the next page. |
||
| 152 | * |
||
| 153 | * @var array |
||
| 154 | */ |
||
| 155 | private $searchAfter; |
||
| 156 | |||
| 157 | /** |
||
| 158 | * URI parameters alongside Request body search. |
||
| 159 | * |
||
| 160 | * @link https://www.elastic.co/guide/en/elasticsearch/reference/current/search-uri-request.html |
||
| 161 | * |
||
| 162 | * @var array |
||
| 163 | */ |
||
| 164 | private $uriParams = []; |
||
| 165 | |||
| 166 | /** |
||
| 167 | * While a search request returns a single “page” of results, the scroll API can be used to retrieve |
||
| 168 | * large numbers of results (or even all results) from a single search request, in much the same way |
||
| 169 | * as you would use a cursor on a traditional database. Scrolling is not intended for real time user |
||
| 170 | * requests, but rather for processing large amounts of data, e.g. in order to reindex the contents |
||
| 171 | * of one index into a new index with a different configuration. |
||
| 172 | * |
||
| 173 | * @var string |
||
| 174 | */ |
||
| 175 | private $scroll; |
||
| 176 | |||
| 177 | /** |
||
| 178 | * @var OrderedSerializer |
||
| 179 | */ |
||
| 180 | private static $serializer; |
||
| 181 | |||
| 182 | /** |
||
| 183 | * @var SearchEndpointInterface[] |
||
| 184 | */ |
||
| 185 | private $endpoints = []; |
||
| 186 | |||
| 187 | /** |
||
| 188 | * Constructor to initialize static properties |
||
| 189 | */ |
||
| 190 | public function __construct() |
||
| 194 | |||
| 195 | /** |
||
| 196 | * Wakeup method to initialize static properties |
||
| 197 | */ |
||
| 198 | public function __wakeup() |
||
| 202 | |||
| 203 | /** |
||
| 204 | * Initializes the serializer |
||
| 205 | */ |
||
| 206 | private function initializeSerializer() |
||
| 217 | |||
| 218 | /** |
||
| 219 | * Destroys search endpoint. |
||
| 220 | * |
||
| 221 | * @param string $type Endpoint type. |
||
| 222 | */ |
||
| 223 | public function destroyEndpoint($type) |
||
| 227 | |||
| 228 | /** |
||
| 229 | * Adds query to the search. |
||
| 230 | * |
||
| 231 | * @param BuilderInterface $query |
||
| 232 | * @param string $boolType |
||
| 233 | * @param string $key |
||
| 234 | * |
||
| 235 | * @return $this |
||
| 236 | */ |
||
| 237 | public function addQuery(BuilderInterface $query, $boolType = BoolQuery::MUST, $key = null) |
||
| 244 | |||
| 245 | /** |
||
| 246 | * Returns endpoint instance. |
||
| 247 | * |
||
| 248 | * @param string $type Endpoint type. |
||
| 249 | * |
||
| 250 | * @return SearchEndpointInterface |
||
| 251 | */ |
||
| 252 | private function getEndpoint($type) |
||
| 260 | |||
| 261 | /** |
||
| 262 | * Returns queries inside BoolQuery instance. |
||
| 263 | * |
||
| 264 | * @return BoolQuery |
||
| 265 | */ |
||
| 266 | public function getQueries() |
||
| 272 | |||
| 273 | /** |
||
| 274 | * Sets query endpoint parameters. |
||
| 275 | * |
||
| 276 | * @param array $parameters |
||
| 277 | * |
||
| 278 | * @return $this |
||
| 279 | */ |
||
| 280 | public function setQueryParameters(array $parameters) |
||
| 286 | |||
| 287 | /** |
||
| 288 | * Sets parameters to the endpoint. |
||
| 289 | * |
||
| 290 | * @param string $endpointName |
||
| 291 | * @param array $parameters |
||
| 292 | * |
||
| 293 | * @return $this |
||
| 294 | */ |
||
| 295 | public function setEndpointParameters($endpointName, array $parameters) |
||
| 303 | |||
| 304 | /** |
||
| 305 | * Adds a post filter to search. |
||
| 306 | * |
||
| 307 | * @param BuilderInterface $filter Filter. |
||
| 308 | * @param string $boolType Example boolType values: |
||
| 309 | * - must |
||
| 310 | * - must_not |
||
| 311 | * - should. |
||
| 312 | * @param string $key |
||
| 313 | * |
||
| 314 | * @return $this. |
||
| 315 | */ |
||
| 316 | public function addPostFilter(BuilderInterface $filter, $boolType = BoolQuery::MUST, $key = null) |
||
| 324 | |||
| 325 | /** |
||
| 326 | * Returns queries inside BoolFilter instance. |
||
| 327 | * |
||
| 328 | * @return BoolQuery |
||
| 329 | */ |
||
| 330 | public function getPostFilters() |
||
| 336 | |||
| 337 | /** |
||
| 338 | * Sets post filter endpoint parameters. |
||
| 339 | * |
||
| 340 | * @param array $parameters |
||
| 341 | * |
||
| 342 | * @return $this |
||
| 343 | */ |
||
| 344 | public function setPostFilterParameters(array $parameters) |
||
| 350 | |||
| 351 | /** |
||
| 352 | * Adds aggregation into search. |
||
| 353 | * |
||
| 354 | * @param AbstractAggregation $aggregation |
||
| 355 | * |
||
| 356 | * @return $this |
||
| 357 | */ |
||
| 358 | public function addAggregation(AbstractAggregation $aggregation) |
||
| 364 | |||
| 365 | /** |
||
| 366 | * Returns all aggregations. |
||
| 367 | * |
||
| 368 | * @return BuilderInterface[] |
||
| 369 | */ |
||
| 370 | public function getAggregations() |
||
| 374 | |||
| 375 | /** |
||
| 376 | * Adds inner hit into search. |
||
| 377 | * |
||
| 378 | * @param NestedInnerHit $innerHit |
||
| 379 | * |
||
| 380 | * @return $this |
||
| 381 | */ |
||
| 382 | public function addInnerHit(NestedInnerHit $innerHit) |
||
| 388 | |||
| 389 | /** |
||
| 390 | * Returns all inner hits. |
||
| 391 | * |
||
| 392 | * @return BuilderInterface[] |
||
| 393 | */ |
||
| 394 | public function getInnerHits() |
||
| 398 | |||
| 399 | /** |
||
| 400 | * Adds sort to search. |
||
| 401 | * |
||
| 402 | * @param BuilderInterface $sort |
||
| 403 | * |
||
| 404 | * @return $this |
||
| 405 | */ |
||
| 406 | public function addSort(BuilderInterface $sort) |
||
| 412 | |||
| 413 | /** |
||
| 414 | * Returns all set sorts. |
||
| 415 | * |
||
| 416 | * @return BuilderInterface[] |
||
| 417 | */ |
||
| 418 | public function getSorts() |
||
| 422 | |||
| 423 | /** |
||
| 424 | * Allows to highlight search results on one or more fields. |
||
| 425 | * |
||
| 426 | * @param Highlight $highlight |
||
| 427 | * |
||
| 428 | * @return $this. |
||
| 429 | */ |
||
| 430 | public function addHighlight($highlight) |
||
| 436 | |||
| 437 | /** |
||
| 438 | * Returns highlight builder. |
||
| 439 | * |
||
| 440 | * @return BuilderInterface |
||
| 441 | */ |
||
| 442 | public function getHighlights() |
||
| 449 | |||
| 450 | /** |
||
| 451 | * Adds suggest into search. |
||
| 452 | * |
||
| 453 | * @param BuilderInterface $suggest |
||
| 454 | * |
||
| 455 | * @return $this |
||
| 456 | */ |
||
| 457 | public function addSuggest(NamedBuilderInterface $suggest) |
||
| 463 | |||
| 464 | /** |
||
| 465 | * Returns all suggests. |
||
| 466 | * |
||
| 467 | * @return BuilderInterface[] |
||
| 468 | */ |
||
| 469 | public function getSuggests() |
||
| 473 | |||
| 474 | /** |
||
| 475 | * @return int |
||
| 476 | */ |
||
| 477 | public function getFrom() |
||
| 481 | |||
| 482 | /** |
||
| 483 | * @param int $from |
||
| 484 | * |
||
| 485 | * @return $this |
||
| 486 | */ |
||
| 487 | public function setFrom($from) |
||
| 493 | |||
| 494 | /** |
||
| 495 | * @param int $time |
||
| 496 | * |
||
| 497 | * @return $this |
||
| 498 | */ |
||
| 499 | public function setTerminateAfter(int $time) |
||
| 505 | |||
| 506 | /** |
||
| 507 | * @param string $time |
||
| 508 | * |
||
| 509 | * @return $this |
||
| 510 | */ |
||
| 511 | public function setTimeout($time) |
||
| 517 | |||
| 518 | /** |
||
| 519 | * @return bool |
||
| 520 | */ |
||
| 521 | public function isTrackTotalHits() |
||
| 525 | |||
| 526 | /** |
||
| 527 | * @param bool $trackTotalHits |
||
| 528 | * |
||
| 529 | * @return $this |
||
| 530 | */ |
||
| 531 | public function setTrackTotalHits(bool $trackTotalHits) |
||
| 537 | |||
| 538 | /** |
||
| 539 | * @return int |
||
| 540 | */ |
||
| 541 | public function getSize() |
||
| 545 | |||
| 546 | /** |
||
| 547 | * @param int $size |
||
| 548 | * |
||
| 549 | * @return $this |
||
| 550 | */ |
||
| 551 | public function setSize($size) |
||
| 557 | |||
| 558 | /** |
||
| 559 | * @return bool |
||
| 560 | */ |
||
| 561 | public function isSource() |
||
| 565 | |||
| 566 | /** |
||
| 567 | * @param bool $source |
||
| 568 | * |
||
| 569 | * @return $this |
||
| 570 | */ |
||
| 571 | public function setSource($source) |
||
| 577 | |||
| 578 | /** |
||
| 579 | * @return array |
||
| 580 | */ |
||
| 581 | public function getStoredFields() |
||
| 585 | |||
| 586 | /** |
||
| 587 | * @param array $storedFields |
||
| 588 | * |
||
| 589 | * @return $this |
||
| 590 | */ |
||
| 591 | public function setStoredFields($storedFields) |
||
| 597 | |||
| 598 | /** |
||
| 599 | * @return array |
||
| 600 | */ |
||
| 601 | public function getScriptFields() |
||
| 605 | |||
| 606 | /** |
||
| 607 | * @param array $scriptFields |
||
| 608 | * |
||
| 609 | * @return $this |
||
| 610 | */ |
||
| 611 | public function setScriptFields($scriptFields) |
||
| 617 | |||
| 618 | /** |
||
| 619 | * @return array |
||
| 620 | */ |
||
| 621 | public function getDocValueFields() |
||
| 625 | |||
| 626 | /** |
||
| 627 | * @param array $docValueFields |
||
| 628 | * |
||
| 629 | * @return $this |
||
| 630 | */ |
||
| 631 | public function setDocValueFields($docValueFields) |
||
| 637 | |||
| 638 | /** |
||
| 639 | * @return bool |
||
| 640 | */ |
||
| 641 | public function isExplain() |
||
| 645 | |||
| 646 | /** |
||
| 647 | * @param bool $explain |
||
| 648 | * |
||
| 649 | * @return $this |
||
| 650 | */ |
||
| 651 | public function setExplain($explain) |
||
| 657 | |||
| 658 | /** |
||
| 659 | * @return bool |
||
| 660 | */ |
||
| 661 | public function isVersion() |
||
| 665 | |||
| 666 | /** |
||
| 667 | * @param bool $version |
||
| 668 | * |
||
| 669 | * @return $this |
||
| 670 | */ |
||
| 671 | public function setVersion($version) |
||
| 677 | |||
| 678 | /** |
||
| 679 | * @return array |
||
| 680 | */ |
||
| 681 | public function getIndicesBoost() |
||
| 685 | |||
| 686 | /** |
||
| 687 | * @param array $indicesBoost |
||
| 688 | * |
||
| 689 | * @return $this |
||
| 690 | */ |
||
| 691 | public function setIndicesBoost($indicesBoost) |
||
| 697 | |||
| 698 | /** |
||
| 699 | * @return int |
||
| 700 | */ |
||
| 701 | public function getMinScore() |
||
| 705 | |||
| 706 | /** |
||
| 707 | * @param int $minScore |
||
| 708 | * |
||
| 709 | * @return $this |
||
| 710 | */ |
||
| 711 | public function setMinScore($minScore) |
||
| 717 | |||
| 718 | /** |
||
| 719 | * @return array |
||
| 720 | */ |
||
| 721 | public function getSearchAfter() |
||
| 725 | |||
| 726 | /** |
||
| 727 | * @param array $searchAfter |
||
| 728 | * |
||
| 729 | * @return $this |
||
| 730 | */ |
||
| 731 | public function setSearchAfter($searchAfter) |
||
| 737 | |||
| 738 | /** |
||
| 739 | * @return string |
||
| 740 | */ |
||
| 741 | public function getScroll() |
||
| 745 | |||
| 746 | /** |
||
| 747 | * @param string $scroll |
||
| 748 | * |
||
| 749 | * @return $this |
||
| 750 | */ |
||
| 751 | public function setScroll($scroll = '5m') |
||
| 759 | |||
| 760 | /** |
||
| 761 | * @param string $name |
||
| 762 | * @param string|array|bool|int $value |
||
| 763 | * |
||
| 764 | * @return $this |
||
| 765 | */ |
||
| 766 | public function addUriParam($name, $value) |
||
| 801 | |||
| 802 | /** |
||
| 803 | * Returns query url parameters. |
||
| 804 | * |
||
| 805 | * @return array |
||
| 806 | */ |
||
| 807 | public function getUriParams() |
||
| 811 | |||
| 812 | /** |
||
| 813 | * {@inheritdoc} |
||
| 814 | */ |
||
| 815 | public function toArray() |
||
| 844 | } |
||
| 845 |
Let’s assume you have a class which uses late-static binding:
The code above will run fine in your PHP runtime. However, if you now create a sub-class and call the
getSomeVariable()on that sub-class, you will receive a runtime error:In the case above, it makes sense to update
SomeClassto useselfinstead: