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Developer Documentation
- Bug fixes for general core bugs in 3.10.x will end 8 November 2021 (12 months).
- Bug fixes for security issues in 3.10.x will end 9 May 2022 (18 months).
- PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.
/search/classes/ -> engine.php (source)
Differences Between: [Versions 310 and 311] [Versions 310 and 400] [Versions 310 and 401] [Versions 310 and 402] [Versions 310 and 403] [Versions 39 and 310]
Base class for search engines. All search engines must extend this class.
| Copyright: | 2015 Daniel Neis |
| License: | http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| File Size: | 780 lines (29 kb) |
| Included or required: | 0 times |
| Referenced: | 0 times |
| Includes or requires: | 0 files |
Defines 3 classes
engine:: (1 method):
__construct()
should:: (0 methods):
namespace:: (32 methods):
get_course()
get_user()
clear_users_cache()
get_search_area()
to_document()
add_documents()
get_plugin_name()
get_document_classname()
index_starting()
index_complete()
area_index_starting()
area_index_complete()
optimize()
is_installed()
get_query_error()
file_indexing_enabled()
clear_query_error()
skip_schema_check()
should_skip_schema_check()
add_document_batch()
delete_index_for_context()
delete_index_for_course()
check_latest_schema()
record_applied_schema_version()
update_schema()
supports_group_filtering()
get_supported_orders()
supports_users()
supports_add_document_batch()
get_batch_max_documents()
get_batch_max_content()
has_alternate_configuration()
Base class for search engines.
All search engines must extend this class.
All search engines must extend this class.
| __construct(bool $alternateconfiguration = false) X-Ref |
| Initialises the search engine configuration. Search engine availability should be checked separately. The alternate configuration option is only used to construct a special second copy of the search engine object, as described in {@see has_alternate_configuration}. param: bool $alternateconfiguration If true, use alternate configuration settings return: void |
| get_course($courseid) X-Ref |
| Returns a course instance checking internal caching. param: int $courseid return: stdClass |
| get_user($userid) X-Ref |
| Returns user data checking the internal static cache. Including here the minimum required user information as this may grow big. param: int $userid return: stdClass |
| clear_users_cache() X-Ref |
| Clears the users cache. return: null |
| get_search_area($areaid) X-Ref |
| Returns a search instance of the specified area checking internal caching. param: string $areaid Area id return: \core_search\base |
| to_document(\core_search\base $searcharea, $docdata) X-Ref |
| Returns a document instance prepared to be rendered. param: \core_search\base $searcharea param: array $docdata return: \core_search\document |
| add_documents($iterator, $searcharea, $options) X-Ref |
| Loop through given iterator of search documents and and have the search engine back end add them to the index. param: \iterator $iterator the iterator of documents to index param: base $searcharea the area for the documents to index param: array $options document indexing options return: array Processed document counts |
| get_plugin_name() X-Ref |
| Returns the plugin name. return: string Frankenstyle plugin name. |
| get_document_classname() X-Ref |
| Gets the document class used by this search engine. Search engines can overwrite \core_search\document with \search_ENGINENAME\document class. Looks for a document class in the current search engine namespace, falling back to \core_search\document. Publicly available because search areas do not have access to the engine details, \core_search\document_factory accesses this function. return: string |
| index_starting($fullindex = false) X-Ref |
| Run any pre-indexing operations. Should be overwritten if the search engine needs to do any pre index preparation. param: bool $fullindex True if a full index will be performed return: void |
| index_complete($numdocs = 0, $fullindex = false) X-Ref |
| Run any post indexing operations. Should be overwritten if the search engine needs to do any post index cleanup. param: int $numdocs The number of documents that were added to the index param: bool $fullindex True if a full index was performed return: void |
| area_index_starting($searcharea, $fullindex = false) X-Ref |
| Do anything that may need to be done before an area is indexed. param: \core_search\base $searcharea The search area that was complete param: bool $fullindex True if a full index is being performed return: void |
| area_index_complete($searcharea, $numdocs = 0, $fullindex = false) X-Ref |
| Do any area cleanup needed, and do anything to confirm contents. Return false to prevent the search area completed time and stats from being updated. param: \core_search\base $searcharea The search area that was complete param: int $numdocs The number of documents that were added to the index param: bool $fullindex True if a full index is being performed return: bool True means that data is considered indexed |
| optimize() X-Ref |
| Optimizes the search engine. Should be overwritten if the search engine can optimize its contents. return: void |
| is_installed() X-Ref |
| Does the system satisfy all the requirements. Should be overwritten if the search engine has any system dependencies that needs to be checked. return: bool |
| get_query_error() X-Ref |
| Returns any error reported by the search engine when executing the provided query. It should be called from static::execute_query when an exception is triggered. return: string |
| file_indexing_enabled() X-Ref |
| Return true if file indexing is supported and enabled. False otherwise. return: bool |
| clear_query_error() X-Ref |
| Clears the current query error value. return: void |
| skip_schema_check($skip = true) X-Ref |
| Tells the search engine to skip any time-consuming checks that it might do as part of the is_server_ready function, and only carry out a basic check that it can contact the server. This setting is not remembered and applies only to the current request. param: bool $skip True to skip the checks, false to start checking again |
| should_skip_schema_check() X-Ref |
| For use by subclasses. The engine can call this inside is_server_ready to check whether it should skip time-consuming schema checks. return: bool True if schema checks should be skipped |
| add_document_batch(array $documents, bool $fileindexing = false) X-Ref |
| Adds multiple documents to the search engine. It should return the number successfully processed, and the number of batches they were processed in (for example if you add 100 documents and there is an error processing one of those documents, and it took 4 batches, it would return [99, 1, 4]). If the engine implements this, it should return true to {@see supports_add_document_batch}. The system will only call this function with up to {@see get_batch_max_documents} documents, and each document in the batch will have content no larger than specified by {@see get_batch_max_content}. param: document[] $documents Documents to add param: bool $fileindexing True if file indexing is to be used return: int[] Array of three elements, successfully processed, failed processed, batch count |
| delete_index_for_context(int $oldcontextid) X-Ref |
| Deletes information related to a specific context id. This should be used when the context itself is deleted from Moodle. This only deletes information for the specified context - not for any child contexts. This function is optional; if not supported it will return false and the information will not be deleted from the search index. If an engine implements this function it should also implement delete_index_for_course; otherwise, nothing will be deleted when users delete an entire course at once. param: int $oldcontextid ID of context that has been deleted return: bool True if implemented |
| delete_index_for_course(int $oldcourseid) X-Ref |
| Deletes information related to a specific course id. This should be used when the course itself is deleted from Moodle. This deletes all information relating to that course from the index, including all child contexts. This function is optional; if not supported it will return false and the information will not be deleted from the search index. If an engine implements this function then, ideally, it should also implement delete_index_for_context so that deletion of single activities/blocks also works. param: int $oldcourseid ID of course that has been deleted return: bool True if implemented |
| check_latest_schema() X-Ref |
| Checks that the schema is the latest version. If the version stored in config does not match the current, this function will attempt to upgrade the schema. return: bool|string True if schema is OK, a string if user needs to take action |
| record_applied_schema_version($version) X-Ref |
| Usually called by the engine; marks that the schema has been updated. param: int $version Records the schema version now applied |
| update_schema($oldversion, $newversion) X-Ref |
| Requests the search engine to upgrade the schema. The engine should update the schema if possible/necessary, and should ensure that record_applied_schema_version is called as a result. If it is not possible to upgrade the schema at the moment, it can do nothing and return; the function will be called again next time search is initialised. The default implementation just returns, with a DEBUG_DEVELOPER warning. param: int $oldversion Old schema version param: int $newversion New schema version return: bool|string True if schema is updated successfully, a string if it needs updating manually |
| supports_group_filtering() X-Ref |
| Checks if this search engine supports groups. Note that returning true to this function causes the parameters to execute_query to be passed differently! In order to implement groups and return true to this function, the search engine should: 1. Handle the fields ->separategroupscontexts and ->usergroups in the $accessinfo parameter to execute_query (ideally, using these to automatically restrict search results). 2. Support the optional groupids parameter in the $filter parameter for execute_query to restrict results to only those where the stored groupid matches the given value. return: bool True if this engine supports searching by group id field |
| get_supported_orders(\context $context) X-Ref |
| Obtain a list of results orders (and names for them) that are supported by this search engine in the given context. By default, engines sort by relevance only. param: \context $context Context that the user requested search from return: array Array from order name => display text |
| supports_users() X-Ref |
| Checks if the search engine supports searching by user. If it returns true to this function, the search engine should support the 'userids' option in the $filters value passed to execute_query(), returning only items where the userid in the search document matches one of those user ids. return: bool True if the search engine supports searching by user |
| supports_add_document_batch() X-Ref |
| Checks if the search engine supports adding documents in a batch. If it returns true to this function, the search engine must implement the add_document_batch function. return: bool True if the search engine supports adding documents in a batch |
| get_batch_max_documents() X-Ref |
| Gets the maximum number of documents to send together in batch mode. Only relevant if the engine returns true to {@see supports_add_document_batch}. Can be overridden by search engine if required. |
| get_batch_max_content() X-Ref |
| Gets the maximum size of document content to be included in a shared batch (if the document is bigger then it will be sent on its own; batching does not provide a performance improvement for big documents anyway). Only relevant if the engine returns true to {@see supports_add_document_batch}. Can be overridden by search engine if required. return: int Max size in bytes, default 1MB |
| has_alternate_configuration() X-Ref |
| Checks if the search engine has an alternate configuration. This is used where the same search engine class supports two different configurations, which are both shown on the settings screen. The alternate configuration is selected by passing 'true' parameter to the constructor. The feature is used when a different connection is in use for indexing vs. querying the search engine. This function should only return true if the engine supports an alternate configuration and the user has filled in the settings. (We do not need to test they are valid, that will happen as normal.) return: bool True if an alternate configuration is defined |
