PHP Class SolrWebService, ojs

Inheritance: extends XmlWebService

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Public Properties

Property	Type	Description
$_fieldCache		A cache containing the available search fields.
$_instId		The unique ID identifying this OJS installation to the solr server.
$_issueCache		An issue cache.
$_journalCache		A journal cache.
$_serviceMessage		A description of the last error or message that occurred when calling the service.
$_solrCore		The solr core we get our data from.
$_solrSearchHandler		The solr search handler name we place our searches on.
$_solrServer		The base URL of the solr server without core and search handler.
$_useProxySettings		Whether the proxy settings in the config.inc.php should be considered for the web service request.

Public Methods

Method	Description
__construct ( $searchHandler, $username, $password, $instId, $useProxy = false )	Constructor
_addArticleXml ( &$articleDoc, &$article, &$journal, $markToDelete = false )	Add the metadata XML of a single article to an XML article list.
_addSubquery ( $fieldList, $searchPhrase, $params )	Add a subquery to the search query.
_cacheMiss ( $cache, $id ) : array	Refresh the cache from the solr server.
_convertDate ( $timestamp ) : string	Convert a date from local time (unix timestamp or ISO date string) to UTC time as understood by solr.
_deleteFromIndex ( $xml ) : boolean	Delete documents from the index (by ID or by query).
_expandFieldList ( $fields ) : string	Expand the given list of fields.
_getAdminUrl ( ) : string	Identifies the general solr admin endpoint from the search handler URL.
_getArticleListXml ( &$articles, $totalCount, &$numDeleted ) : string	Retrieve the XML for a batch of articles to be updated.
_getAutosuggestUrl ( $autosuggestType ) : string	Returns the solr auto-suggestion endpoint.
_getCache ( ) : FileCache	Get the field cache.
_getCoreAdminUrl ( ) : string	Identifies the solr core-specific admin endpoint from the search handler URL.
_getDihUrl ( ) : string	Returns the solr DIH endpoint.
_getDocumentsProcessed ( $result ) : integer	Retrieve the number of indexed documents from a DIH response XML
_getFacetingAutosuggestions ( $url, $searchRequest, $userInput, $fieldName ) : array	Retrieve auto-suggestions from the faceting service.
_getFieldNames ( $fieldType ) : array	Return a list of all text fields that may occur in the index.
_getInterestingTermsUrl ( ) : string	Returns the solr endpoint to retrieve "interesting terms" from a given document.
_getIssue ( $issueId, $journalId ) : Issue	Retrieve an issue (possibly from the cache).
_getJournal ( $journalId ) : Journal	Retrieve a journal (possibly from the cache).
_getLocalesAndFormats ( $field ) : array	Identify all format/locale versions of the given field.
_getOrdering ( $field, $direction ) : string	Generate the ordering parameter of a search query.
_getReloadExternalFilesUrl ( )	Returns the solr endpoint to reload external files.
_getSearchQueryParameters ( &$searchRequest ) : array \| null	Create the edismax query parameters from a search request.
_getSearchUrl ( ) : string	Returns the solr search endpoint.
_getSuggesterAutosuggestions ( $url, $userInput, $fieldName ) : array	Retrieve auto-suggestions from the suggester service.
_getUpdateUrl ( ) : string	Returns the solr update endpoint.
_indexingTransaction ( $sendXmlCallback, $batchSize = SOLR_INDEXING_MAX_BATCHSIZE, $journalId = null )	This method encapsulates an indexing transaction (pull or push).
_isArticleAccessAuthorized ( &$article ) : boolean	Check whether access to the given article is authorized to the requesting party (i.e. the Solr server).
_makeRequest ( $url, $params = [], $method = 'GET' ) : DOMXPath	Make a request
_pushIndexingCallback ( &$articleXml, $batchCount, $numDeleted ) : integer	Handle push indexing.
_setQuery ( $fieldList, $searchPhrase, $spellcheck = false )	Set the query parameters for a search query.
_translateSearchPhrase ( $searchPhrase, $backwards = false ) : The	Translate query keywords.
deleteArticleFromIndex ( $articleId ) : boolean	Deletes the given article from the Solr index.
deleteArticlesFromIndex ( $journalId = null ) : boolean	Deletes all articles of a journal or of the installation from the Solr index.
flushFieldCache ( )	Flush the field cache.
getArticleFromIndex ( $articleId ) : array	Retrieve a document directly from the index (for testing/debugging purposes only).
getAutosuggestions ( $searchRequest, $fieldName, $userInput, $autosuggestType ) : array	Retrieve auto-suggestions from the solr index corresponding to the given user input.
getAvailableFields ( $fieldType ) : array	Returns an array with all (dynamic) fields in the index.
getInterestingTerms ( $articleId ) : array	Retrieve "interesting terms" from a document to be used in a "similar documents" search.
getServerStatus ( ) : integer	Checks the solr server status.
getServiceMessage ( ) : string	Get the last service message.
markArticleChanged ( $articleId )	Mark a single article "changed" so that the indexing back-end will update it during the next batch update.
markJournalChanged ( $journalId ) : integer	Mark the given journal for re-indexing.
pullChangedArticles ( $pullIndexingCallback, $batchSize = SOLR_INDEXING_MAX_BATCHSIZE, $journalId = null ) : integer	Retrieves a batch of articles in XML format.
pushChangedArticles ( $batchSize = SOLR_INDEXING_MAX_BATCHSIZE, $journalId = null ) : integer	(Re-)indexes all changed articles in Solr.
rebuildDictionaries ( )	Rebuilds the spelling/auto-suggest dictionaries.
reloadExternalFiles ( )	Reloads external files.
retrieveResults ( &$searchRequest, &$totalResults ) : array	Execute a search against the Solr search server.

Method Details

__construct() public method

Constructor

public __construct ( $searchHandler, $username, $password, $instId, $useProxy = false )
$searchHandler		string The search handler URL. We assume the embedded server as a default.
$username		string The HTTP BASIC authentication username.
$password		string The corresponding password.
$instId		string The unique ID of this OJS installation to partition a shared index. @param $useProxy boolean Whether the proxy settings from config.inc.php should be considered.

_addArticleXml() public method

Add the metadata XML of a single article to an XML article list.

public _addArticleXml ( &$articleDoc, &$article, &$journal, $markToDelete = false )
$articleDoc		DOMDocument
$article		PublishedArticle
$journal		Journal
$markToDelete		boolean If true the returned XML will only contain a deletion marker.

_addSubquery() public method

NB: subqueries do not support collation (for alternative spelling suggestions).

public _addSubquery ( $fieldList, $searchPhrase, $params )
$fieldList		string A list of fields to be queried, separated by '\|'.
$searchPhrase		string The search phrase to be added.
$params		array The existing query parameters.

_cacheMiss() public method

Refresh the cache from the solr server.

public _cacheMiss ( $cache, $id ) : array
$cache		FileCache
$id		string The field type.
return	array	The available field names.

_convertDate() public method

NB: Using intermediate unix timestamps can be a problem in older PHP versions, especially on Windows where negative timestamps are not supported. As Solr requires PHP5 that should not be a big problem in practice, except for electronic publications that go back until earlier than 1901. It does not seem probable that such a situation could realistically arise with OJS.

public _convertDate ( $timestamp ) : string
$timestamp		int\|string Unix timestamp or local ISO time.
return	string	ISO UTC timestamp

_deleteFromIndex() public method

Delete documents from the index (by ID or by query).

public _deleteFromIndex ( $xml ) : boolean
$xml		string The documents to delete.
return	boolean	true, if successful, otherwise false.

_expandFieldList() public method

Expand the given list of fields.

public _expandFieldList ( $fields ) : string
$fields		array
return	string	A space-separated field list (e.g. to be used in edismax's qf parameter).

_getAdminUrl() public method

Identifies the general solr admin endpoint from the search handler URL.

public _getAdminUrl ( ) : string
return	string

_getArticleListXml() public method

Retrieve the XML for a batch of articles to be updated.

public _getArticleListXml ( &$articles, $totalCount, &$numDeleted ) : string
$articles		DBResultFactory The articles to be included in the list.
$totalCount		integer The overall number of changed articles (not only the current batch).
$numDeleted		integer An output parameter that returns the number of documents that will be deleted.
return	string	The XML ready to be consumed by the Solr data import service.

_getAutosuggestUrl() public method

Returns the solr auto-suggestion endpoint.

public _getAutosuggestUrl ( $autosuggestType ) : string
$autosuggestType		string One of the SOLR_AUTOSUGGEST_* constants
return	string

_getCache() public method

Get the field cache.

public _getCache ( ) : FileCache
return	FileCache

_getCoreAdminUrl() public method

Identifies the solr core-specific admin endpoint from the search handler URL.

public _getCoreAdminUrl ( ) : string
return	string

_getDihUrl() public method

Returns the solr DIH endpoint.

public _getDihUrl ( ) : string
return	string

_getDocumentsProcessed() public method

Retrieve the number of indexed documents from a DIH response XML

public _getDocumentsProcessed ( $result ) : integer
$result		DOMXPath
return	integer

_getFacetingAutosuggestions() public method

Retrieve auto-suggestions from the faceting service.

public _getFacetingAutosuggestions ( $url, $searchRequest, $userInput, $fieldName ) : array
$url		string
$searchRequest		SolrSearchRequest
$userInput		string
$fieldName		string
return	array	The generated suggestions.

_getFieldNames() public method

Return a list of all text fields that may occur in the index.

public _getFieldNames ( $fieldType ) : array
$fieldType		string "search", "sort" or "all"
return	array

_getInterestingTermsUrl() public method

Returns the solr endpoint to retrieve "interesting terms" from a given document.

public _getInterestingTermsUrl ( ) : string
return	string

_getIssue() public method

Retrieve an issue (possibly from the cache).

public _getIssue ( $issueId, $journalId ) : Issue
$issueId		int
$journalId		int
return	Issue

_getJournal() public method

Retrieve a journal (possibly from the cache).

public _getJournal ( $journalId ) : Journal
$journalId		int
return	Journal

_getLocalesAndFormats() public method

Identify all format/locale versions of the given field.

public _getLocalesAndFormats ( $field ) : array
$field		string A field name without any extension.
return	array	A list of index fields.

_getOrdering() public method

Generate the ordering parameter of a search query.

public _getOrdering ( $field, $direction ) : string
$field		string the field to order by
$direction		boolean true for ascending, false for descending
return	string	The ordering to be used (default: descending relevance).

_getReloadExternalFilesUrl() public method

Returns the solr endpoint to reload external files.

public _getReloadExternalFilesUrl ( )

_getSearchQueryParameters() public method

Create the edismax query parameters from a search request.

public _getSearchQueryParameters ( &$searchRequest ) : array \| null
$searchRequest		SolrSearchRequest
return	array \| null	A parameter array or null if something went wrong.

_getSearchUrl() public method

Returns the solr search endpoint.

public _getSearchUrl ( ) : string
return	string

_getSuggesterAutosuggestions() public method

Retrieve auto-suggestions from the suggester service.

public _getSuggesterAutosuggestions ( $url, $userInput, $fieldName ) : array
$url		string
$userInput		string
$fieldName		string
return	array	The generated suggestions.

_getUpdateUrl() public method

Returns the solr update endpoint.

public _getUpdateUrl ( ) : string
return	string

_indexingTransaction() public method

It consists in generating the XML, transferring it to the server and marking the transferred articles as "indexed".

public _indexingTransaction ( $sendXmlCallback, $batchSize = SOLR_INDEXING_MAX_BATCHSIZE, $journalId = null )
$sendXmlCallback		callback This function will be called with the generated XML.
$batchSize		integer The maximum number of articles to be returned.
$journalId		integer If given, only retrieves articles for the given journal.

_isArticleAccessAuthorized() public method

Check whether access to the given article is authorized to the requesting party (i.e. the Solr server).

public _isArticleAccessAuthorized ( &$article ) : boolean
$article		Article
return	boolean	True if authorized, otherwise false.

_makeRequest() public method

Make a request

public _makeRequest ( $url, $params = [], $method = 'GET' ) : DOMXPath
$url		string The request URL
$params		mixed array (key value pairs) or string request parameters
$method		string GET or POST
return	DOMXPath	An XPath object with the response loaded. Null if an error occurred. See _serviceMessage for more details about the error.

_pushIndexingCallback() public method

This method pushes XML with index changes directly to the Solr data import handler for immediate processing.

public _pushIndexingCallback ( &$articleXml, $batchCount, $numDeleted ) : integer
$articleXml		string The XML with index changes to be pushed to the Solr server.
$batchCount		integer The number of articles in the XML list (i.e. the expected number of documents to be indexed).
$numDeleted		integer The number of articles in the XML list that are marked for deletion.
return	integer	The number of articles processed or null if an error occurred. After an error the method SolrWebService::getServiceMessage() will return details of the error.

_setQuery() public method

Set the query parameters for a search query.

public _setQuery ( $fieldList, $searchPhrase, $spellcheck = false )
$fieldList		string A list of fields to be queried, separated by '\|'.
$searchPhrase		string The search phrase to be added.
$spellcheck		boolean Whether to switch spellchecking on.

_translateSearchPhrase() public method

Translate query keywords.

public _translateSearchPhrase ( $searchPhrase, $backwards = false ) : The
$searchPhrase		string
return	The	translated search phrase.

deleteArticleFromIndex() public method

Deletes the given article from the Solr index.

public deleteArticleFromIndex ( $articleId ) : boolean
$articleId		integer The ID of the article to be deleted.
return	boolean	true if successful, otherwise false.

deleteArticlesFromIndex() public method

Deletes all articles of a journal or of the installation from the Solr index.

public deleteArticlesFromIndex ( $journalId = null ) : boolean
$journalId		integer If given, only articles from this journal will be deleted.
return	boolean	true if successful, otherwise false.

flushFieldCache() public method

Flush the field cache.

public flushFieldCache ( )

getArticleFromIndex() public method

Retrieve a document directly from the index (for testing/debugging purposes only).

public getArticleFromIndex ( $articleId ) : array
$articleId
return	array	The document fields.

getAutosuggestions() public method

Retrieve auto-suggestions from the solr index corresponding to the given user input.

public getAutosuggestions ( $searchRequest, $fieldName, $userInput, $autosuggestType ) : array
$searchRequest		SolrSearchRequest Active search filters. Choosing the faceting auto-suggest implementation via $autosuggestType will pre-filter auto-suggestions based on this search request. In case of the suggester component, the search request will simply be ignored.
$fieldName		string The field to suggest values for. Values are queried on field level to improve relevance of suggestions.
$userInput		string Partial query input. This input will be split split up. Only the last query term will be used to suggest values.
$autosuggestType		string One of the SOLR_AUTOSUGGEST_* constants. The faceting implementation is slower but will return more relevant suggestions. The suggestor implementation is faster and scales better in large deployments. It will return terms from a field-specific global dictionary, though, e.g. from different journals.
return	array	A list of suggested queries

getAvailableFields() public method

NB: This is cached data so after an index update we may have to flush the index to re-read the current index state.

public getAvailableFields ( $fieldType ) : array
$fieldType		string Either 'search' or 'sort'.
return	array

getInterestingTerms() public method

Retrieve "interesting terms" from a document to be used in a "similar documents" search.

public getInterestingTerms ( $articleId ) : array
$articleId		integer The article from which we retrieve "interesting terms".
return	array	An array of terms that can be used to execute a search for similar documents.

getServerStatus() public method

Checks the solr server status.

public getServerStatus ( ) : integer
return	integer	One of the SOLR_STATUS_* constants.

getServiceMessage() public method

Get the last service message.

public getServiceMessage ( ) : string
return	string

markArticleChanged() public method

Mark a single article "changed" so that the indexing back-end will update it during the next batch update.

public markArticleChanged ( $articleId )
$articleId		Integer

markJournalChanged() public method

Mark the given journal for re-indexing.

public markJournalChanged ( $journalId ) : integer
$journalId		integer The ID of the journal to be (re-)indexed.
return	integer	The number of articles that have been marked.

pullChangedArticles() public method

This is the pull-indexing implementation of the Solr web service. To control memory usage and response time we index articles in batches. Batches should be as large as possible to reduce index commit overhead.

public pullChangedArticles ( $pullIndexingCallback, $batchSize = SOLR_INDEXING_MAX_BATCHSIZE, $journalId = null ) : integer
$batchSize		integer The maximum number of articles to be returned.
$journalId		integer If given, only returns articles from the given journal.
return	integer	The number of articles processed or null if an error occurred. After an error the method SolrWebService::getServiceMessage() will return details of the error.

pushChangedArticles() public method

This is the push-indexing implementation of the Solr web service. To control memory usage and response time we index articles in batches. Batches should be as large as possible to reduce index commit overhead.

public pushChangedArticles ( $batchSize = SOLR_INDEXING_MAX_BATCHSIZE, $journalId = null ) : integer
$batchSize		integer The maximum number of articles to be indexed in this run.
$journalId		integer If given, restrains index updates to the given journal.
return	integer	The number of articles processed or null if an error occurred. After an error the method SolrWebService::getServiceMessage() will return details of the error.

rebuildDictionaries() public method

Rebuilds the spelling/auto-suggest dictionaries.

public rebuildDictionaries ( )

reloadExternalFiles() public method

Reloads external files.

public reloadExternalFiles ( )

retrieveResults() public method

Execute a search against the Solr search server.

public retrieveResults ( &$searchRequest, &$totalResults ) : array
$searchRequest		SolrSearchRequest
$totalResults		integer An output parameter returning the total number of search results found by the query. This differs from the actual number of returned results as the search can be limited.
return	array	An array of search results. The main keys are result types. These are "scoredResults" and "alternativeSpelling". The keys in the "scoredResults" sub-array are scores (1-9999) and the values are article IDs. The alternative spelling sub-array returns an alternative query string (if any) and the number of hits for this string. Null if an error occurred while querying the server.

Property Details

$_fieldCache public_oe property

A cache containing the available search fields.

public $_fieldCache

$_instId public_oe property

The unique ID identifying this OJS installation to the solr server.

public $_instId

$_issueCache public_oe property

An issue cache.

public $_issueCache

$_journalCache public_oe property

A journal cache.

public $_journalCache

$_serviceMessage public_oe property

A description of the last error or message that occurred when calling the service.

public $_serviceMessage

$_solrCore public_oe property

The solr core we get our data from.

public $_solrCore

$_solrSearchHandler public_oe property

The solr search handler name we place our searches on.

public $_solrSearchHandler

$_solrServer public_oe property

The base URL of the solr server without core and search handler.

public $_solrServer

$_useProxySettings public_oe property

Whether the proxy settings in the config.inc.php should be considered for the web service request.

public $_useProxySettings