WikiDB is a container for WikiDB_Pages which in * turn contain WikiDB_PageRevisions. * * Conceptually a WikiDB contains all possible * WikiDB_Pages, whether they have been initialized or not. * Since all possible pages are already contained in a WikiDB, a call * to WikiDB::getPage() will never fail (barring bugs and * e.g. filesystem or SQL database problems.) * * Also each WikiDB_Page always contains at least one * WikiDB_PageRevision: the default content (e.g. "Describe * [PageName] here."). This default content has a version number of * zero. * * WikiDB_PageRevisions have read-only semantics. One can * only create new revisions or delete old ones --- one can not modify * an existing revision. */ class WikiDB extends locDatabase{ /** * Open a WikiDB database. * * This is a static member function. This function inspects its * arguments to determine the proper subclass of WikiDB to * instantiate, and then it instantiates it. * * @access public * * @param $dbparams hash Database configuration parameters. * Some pertinent paramters are: *
*
dbtype *
The back-end type. Current supported types are: *
*
SQL *
Generic SQL backend based on the PEAR/DB database abstraction * library. *
dba *
Dba based backend. *
* *
dsn *
(Used by the SQL backend.) * The DSN specifying which database to connect to. * *
prefix *
Prefix to be prepended to database table (and file names). * *
directory *
(Used by the dba backend.) * Which directory db files reside in. * *
timeout *
(Used by the dba backend.) * Timeout in seconds for opening (and obtaining lock) on the * db files. * *
dba_handler *
(Used by the dba backend.) * * Which dba handler to use. Good choices are probably either * 'gdbm' or 'db2'. *
* * @return object A WikiDB object. **/ function open ($dbparams) { $dbtype = $dbparams{'dbtype'}; include_once("lib/WikiDB/$dbtype.php"); $class = 'WikiDB_' . $dbtype; return new $class ($dbparams); } /** * Constructor * @access protected */ function WikiDB ($backend, $dbparams) { $this->_backend = &$backend; $this->_cache = new WikiDB_cache($backend); //FIXME: devel checking. //$this->_backend->check(); } /** * Get any user-level warnings about this WikiDB. * * Some back-ends, e.g. by default create there data files in the * global /tmp directory. We would like to warn the user when this * happens (since /tmp files tend to get wiped periodically.) * Warnings such as these may be communicated from specific * back-ends through this method. * * @access public * * @return string A warning message (or false if there is * none.) */ function genericWarnings() { return false; } /** * Close database connection. * * The database may no longer be used after it is closed. * * Closing a WikiDB invalidates all WikiDB_Pages, * WikiDB_PageRevisions and WikiDB_PageIterators * which have been obtained from it. * * @access public */ function close () { $this->_backend->close(); $this->_cache->close(); } /** * Get a WikiDB_Page from a WikiDB. * * A WikiDB consists of the (infinite) set of all possible pages, * therefore this method never fails. * * @access public * @param $pagename string Which page to get. * @return object The requested WikiDB_Page. */ function getPage($pagename) { assert(is_string($pagename) && $pagename); return new WikiDB_Page($this, $pagename); } // Do we need this? //function nPages() { //} /** * Determine whether page exists (in non-default form). * *
     *   $is_page = $dbi->isWikiPage($pagename);
     * 
* is equivalent to *
     *   $page = $dbi->getPage($pagename);
     *   $current = $page->getCurrentRevision();
     *   $is_page = ! $current->hasDefaultContents();
     * 
* however isWikiPage may be implemented in a more efficient * manner in certain back-ends. * * @access public * * @param $pagename string Which page to check. * * @return boolean True if the page actually exists with * non-default contents in the WikiDataBase. */ function isWikiPage ($pagename) { $page = $this->getPage($pagename); $current = $page->getCurrentRevision(); return ! $current->hasDefaultContents(); } /** * Delete page from the WikiDB. * * Deletes all revisions of the page from the WikiDB. Also resets * all page meta-data to the default values. * * @access public * * @param $pagename string Name of page to delete. */ function deletePage($pagename) { $this->_cache->delete_page($pagename); $this->_backend->set_links($pagename, false); } /** * Retrieve all pages. * * Gets the set of all pages with non-default contents. * * FIXME: do we need this? I think so. The simple searches * need this stuff. * * @access public * * @param $include_defaulted boolean Normally pages whose most * recent revision has empty content are considered to be * non-existant. Unless $include_defaulted is set to true, those * pages will not be returned. * * @return object A WikiDB_PageIterator which contains all pages * in the WikiDB which have non-default contents. */ function getAllPages($include_defaulted = false) { $result = $this->_backend->get_all_pages($include_defaulted); return new WikiDB_PageIterator($this, $result); } /** * Title search. * * Search for pages containing (or not containing) certain words * in their names. * * Pages are returned in alphabetical order whenever it is * practical to do so. * * FIXME: should titleSearch and fullSearch be combined? I think so. * * @access public * @param $search object A TextSearchQuery * @return object A WikiDB_PageIterator containing the matching pages. * @see TextSearchQuery */ function titleSearch($search) { $result = $this->_backend->text_search($search); return new WikiDB_PageIterator($this, $result); } /** * Full text search. * * Search for pages containing (or not containing) certain words * in their entire text (this includes the page content and the * page name). * * Pages are returned in alphabetical order whenever it is * practical to do so. * * @access public * * @param $search object A TextSearchQuery object. * @return object A WikiDB_PageIterator containing the matching pages. * @see TextSearchQuery */ function fullSearch($search) { $result = $this->_backend->text_search($search, 'full_text'); return new WikiDB_PageIterator($this, $result); } /** * Find the pages with the greatest hit counts. * * Pages are returned in reverse order by hit count. * * @access public * * @param $limit signed integer The maximum number of pages to return. * Set $limit to zero to return all pages. If $limit < 0, pages will * be sorted in decreasing order of popularity. * * @return object A WikiDB_PageIterator containing the matching * pages. */ function mostPopular($limit = 20) { $result = $this->_backend->most_popular($limit); return new WikiDB_PageIterator($this, $result); } /** * Find recent page revisions. * * Revisions are returned in reverse order by creation time. * * @access public * * @param $params hash This hash is used to specify various optional * parameters: *
*
limit *
(integer) At most this many revisions will be returned. *
since *
(integer) Only revisions since this time (unix-timestamp) will be returned. *
include_minor_revisions *
(boolean) Also include minor revisions. (Default is not to.) *
exclude_major_revisions *
(boolean) Don't include non-minor revisions. * (Exclude_major_revisions implies include_minor_revisions.) *
include_all_revisions *
(boolean) Return all matching revisions for each page. * Normally only the most recent matching revision is returned * for each page. *
* * @return object A WikiDB_PageRevisionIterator containing the * matching revisions. */ function mostRecent($params = false) { $result = $this->_backend->most_recent($params); return new WikiDB_PageRevisionIterator($this, $result); } }; /** * An abstract base class which representing a wiki-page within a * WikiDB. * * A WikiDB_Page contains a number (at least one) of * WikiDB_PageRevisions. */ class WikiDB_Page { function WikiDB_Page(&$wikidb, $pagename) { $this->_wikidb = &$wikidb; $this->_pagename = $pagename; assert(!empty($this->_pagename)); } /** * Get the name of the wiki page. * * @access public * * @return string The page name. */ function getName() { return $this->_pagename; } /** * Delete an old revision of a WikiDB_Page. * * Deletes the specified revision of the page. * It is a fatal error to attempt to delete the current revision. * * @access public * * @param $version integer Which revision to delete. (You can also * use a WikiDB_PageRevision object here.) */ function deleteRevision($version) { $backend = &$this->_wikidb->_backend; $cache = &$this->_wikidb->_cache; $pagename = &$this->_pagename; $version = $this->_coerce_to_version($version); if ($version == 0) return; $backend->lock(); $latestversion = $cache->get_latest_version($pagename); if ($latestversion && $version == $latestversion) { $backend->unlock(); trigger_error(sprintf("Attempt to delete most recent revision of '%s'", $pagename), E_USER_ERROR); return; } $cache->delete_versiondata($pagename, $version); $backend->unlock(); } /* * Delete a revision, or possibly merge it with a previous * revision. * * The idea is this: * Suppose an author make a (major) edit to a page. Shortly * after that the same author makes a minor edit (e.g. to fix * spelling mistakes he just made.) * * Now some time later, where cleaning out old saved revisions, * and would like to delete his minor revision (since there's * really no point in keeping minor revisions around for a long * time.) * * Note that the text after the minor revision probably represents * what the author intended to write better than the text after * the preceding major edit. * * So what we really want to do is merge the minor edit with the * preceding edit. * * We will only do this when: * */ function mergeRevision($version) { $backend = &$this->_wikidb->_backend; $cache = &$this->_wikidb->_cache; $pagename = &$this->_pagename; $version = $this->_coerce_to_version($version); if ($version == 0) return; $backend->lock(); $latestversion = $backend->get_latest_version($pagename); if ($latestversion && $version == $latestversion) { $backend->unlock(); trigger_error(sprintf("Attempt to merge most recent revision of '%s'", $pagename), E_USER_ERROR); return; } $versiondata = $cache->get_versiondata($pagename, $version, true); if (!$versiondata) { // Not there? ... we're done! $backend->unlock(); return; } if ($versiondata['is_minor_edit']) { $previous = $backend->get_previous_version($pagename, $version); if ($previous) { $prevdata = $cache->get_versiondata($pagename, $previous); if ($prevdata['author_id'] == $versiondata['author_id']) { // This is a minor revision, previous version is // by the same author. We will merge the // revisions. $cache->update_versiondata($pagename, $previous, array('%content' => $versiondata['%content'], '_supplanted' => $versiondata['_supplanted'])); } } } $cache->delete_versiondata($pagename, $version); $backend->unlock(); } /** * Create a new revision of a WikiDB_Page. * * @access public * * @param $content string Contents of new revision. * * @param $metadata hash Metadata for new revision. * All values in the hash should be scalars (strings or integers). * * * @param $version int Version number for new revision. * To ensure proper serialization of edits, $version must be * exactly one higher than the current latest version. * (You can defeat this check by setting $version to * WIKIDB_FORCE_CREATE --- not usually recommended.) * * @param $links array List of pagenames which this page links to. * * @return object Returns the new WikiDB_PageRevision object. If * $version was incorrect, returns false */ function createRevision($version, &$content, $metadata, $links) { $backend = &$this->_wikidb->_backend; $cache = &$this->_wikidb->_cache; $pagename = &$this->_pagename; $backend->lock(); $latestversion = $backend->get_latest_version($pagename); $newversion = $latestversion + 1; assert($newversion >= 1); if ($version != WIKIDB_FORCE_CREATE && $version != $newversion) { $backend->unlock(); return false; } $data = $metadata; foreach ($data as $key => $val) { if (empty($val) || $key[0] == '_' || $key[0] == '%') unset($data[$key]); } assert(!empty($data['author_id'])); if (empty($data['author_id'])) @$data['author_id'] = $data['author']; if (empty($data['mtime'])) $data['mtime'] = time(); if ($latestversion) { // Ensure mtimes are monotonic. $pdata = $cache->get_versiondata($pagename, $latestversion); if ($data['mtime'] < $pdata['mtime']) { trigger_error(sprintf(_("%s: Date of new revision is %s"), $pagename,"'non-monotonic'"), E_USER_NOTICE); $data['orig_mtime'] = $data['mtime']; $data['mtime'] = $pdata['mtime']; } // FIXME: use (possibly user specified) 'mtime' time or // time()? $cache->update_versiondata($pagename, $latestversion, array('_supplanted' => $data['mtime'])); } $data['%content'] = &$content; $cache->set_versiondata($pagename, $newversion, $data); //$cache->update_pagedata($pagename, array(':latestversion' => $newversion, //':deleted' => empty($content))); $backend->set_links($pagename, $links); $backend->unlock(); // FIXME: probably should have some global state information // in the backend to control when to optimize. if (time() % 50 == 0) { trigger_error(sprintf(_("Optimizing %s"),'backend'), E_USER_NOTICE); $backend->optimize(); } return new WikiDB_PageRevision($this->_wikidb, $pagename, $newversion, $data); } /** * Get the most recent revision of a page. * * @access public * * @return object The current WikiDB_PageRevision object. */ function getCurrentRevision() { $backend = &$this->_wikidb->_backend; $cache = &$this->_wikidb->_cache; $pagename = &$this->_pagename; $backend->lock(); $version = $cache->get_latest_version($pagename); $revision = $this->getRevision($version); $backend->unlock(); assert($revision); return $revision; } /** * Get a specific revision of a WikiDB_Page. * * @access public * * @param $version integer Which revision to get. * * @return object The requested WikiDB_PageRevision object, or * false if the requested revision does not exist in the WikiDB. * Note that version zero of any page always exists. */ function getRevision($version) { $cache = &$this->_wikidb->_cache; $pagename = &$this->_pagename; if ($version == 0) return new WikiDB_PageRevision($this->_wikidb, $pagename, 0); assert($version > 0); $vdata = $cache->get_versiondata($pagename, $version); if (!$vdata) return false; return new WikiDB_PageRevision($this->_wikidb, $pagename, $version, $vdata); } /** * Get previous page revision. * * This method find the most recent revision before a specified * version. * * @access public * * @param $version integer Find most recent revision before this version. * You can also use a WikiDB_PageRevision object to specify the $version. * * @return object The requested WikiDB_PageRevision object, or false if the * requested revision does not exist in the WikiDB. Note that * unless $version is greater than zero, a revision (perhaps version zero, * the default revision) will always be found. */ function getRevisionBefore($version) { $backend = &$this->_wikidb->_backend; $pagename = &$this->_pagename; $version = $this->_coerce_to_version($version); if ($version == 0) return false; $backend->lock(); $previous = $backend->get_previous_version($pagename, $version); $revision = $this->getRevision($previous); $backend->unlock(); assert($revision); return $revision; } /** * Get all revisions of the WikiDB_Page. * * This does not include the version zero (default) revision in the * returned revision set. * * @return object a WikiDB_PageRevisionIterator containing all * revisions of this WikiDB_Page in reverse order by version * number. */ function getAllRevisions() { $backend = &$this->_wikidb->_backend; $revs = $backend->get_all_revisions($this->_pagename); return new WikiDB_PageRevisionIterator($this->_wikidb, $revs); } /** * Find pages which link to or are linked from a page. * * @access public * * @param $reversed enum Which links to find: true for backlinks (default). * * @return object A WikiDB_PageIterator containing all matching pages. */ function getLinks($reversed = true) { $backend = &$this->_wikidb->_backend; $result = $backend->get_links($this->_pagename, $reversed); return new WikiDB_PageIterator($this->_wikidb, $result); } /** * Access WikiDB_Page meta-data. * * @access public * * @param $key string Which meta data to get. * Some reserved meta-data keys are: *
*
'locked'
Is page locked? *
'hits'
Page hit counter. *
'score
Page score (not yet implement, do we need?) *
* * @return scalar The requested value, or false if the requested data * is not set. */ function get($key) { $cache = &$this->_wikidb->_cache; if (!$key || $key[0] == '%') return false; $data = $cache->get_pagedata($this->_pagename); return isset($data[$key]) ? $data[$key] : false; } /** * Get all the page meta-data as a hash. * * @return hash The page meta-data. */ function getMetaData() { $cache = &$this->_wikidb->_cache; $data = $cache->get_pagedata($this->_pagename); $meta = array(); foreach ($data as $key => $val) { if (!empty($val) && $key[0] != '%') $meta[$key] = $val; } return $meta; } /** * Set page meta-data. * * @see get * @access public * * @param $key string Meta-data key to set. * @param $newval string New value. */ function set($key, $newval) { $cache = &$this->_wikidb->_cache; $pagename = &$this->_pagename; assert($key && $key[0] != '%'); $data = $cache->get_pagedata($pagename); if (!empty($newval)) { if (!empty($data[$key]) && $data[$key] == $newval) return; // values identical, skip update. } else { if (empty($data[$key])) return; // values identical, skip update. } $cache->update_pagedata($pagename, array($key => $newval)); } /** * Increase page hit count. * * FIXME: IS this needed? Probably not. * * This is a convenience function. *
 $page->increaseHitCount(); 
* is functionally identical to *
 $page->set('hits',$page->get('hits')+1); 
* * Note that this method may be implemented in more efficient ways * in certain backends. * * @access public */ function increaseHitCount() { @$newhits = $this->get('hits') + 1; $this->set('hits', $newhits); } /** * Return a string representation of the WikiDB_Page * * This is really only for debugging. * * @access public * * @return string Printable representation of the WikiDB_Page. */ function asString () { ob_start(); printf("[%s:%s\n", get_class($this), $this->getName()); print_r($this->getMetaData()); echo "]\n"; $strval = ob_get_contents(); ob_end_clean(); return $strval; } /** * @access private * @param $version_or_pagerevision int or object * Takes either the version number (and int) or a WikiDB_PageRevision * object. * @return int The version number. */ function _coerce_to_version($version_or_pagerevision) { if (method_exists($version_or_pagerevision, "getContent")) $version = $version_or_pagerevision->getVersion(); else $version = (int) $version_or_pagerevision; assert($version >= 0); return $version; } }; /** * This class represents a specific revision of a WikiDB_Page within * a WikiDB. * * A WikiDB_PageRevision has read-only semantics. You may only create * new revisions (and delete old ones) --- you cannot modify existing * revisions. */ class WikiDB_PageRevision { function WikiDB_PageRevision(&$wikidb, $pagename, $version, $versiondata = false) { $this->_wikidb = &$wikidb; $this->_pagename = $pagename; $this->_version = $version; $this->_data = $versiondata ? $versiondata : array(); } /** * Get the WikiDB_Page which this revision belongs to. * * @access public * * @return object The WikiDB_Page which this revision belongs to. */ function getPage() { return new WikiDB_Page($this->_wikidb, $this->_pagename); } /** * Get the version number of this revision. * * @access public * * @return int The version number of this revision. */ function getVersion() { return $this->_version; } /** * Determine whether this revision has defaulted content. * * The default revision (version 0) of each page, as well as any * pages which are created with empty content have their content * defaulted to something like: *
     *   Describe [ThisPage] here.
     * 
* * @access public * * @return boolean Returns true if the page has default content. */ function hasDefaultContents() { $data = &$this->_data; return empty($data['%content']); } /** * Get the content as an array of lines. * * @access public * * @return array An array of lines. * The lines should contain no trailing white space. */ function getContent() { return explode("\n", $this->getPackedContent()); } /** * Determine whether revision is the latest. * * @access public * * @return bool True iff the revision is the latest (most recent) one. */ function isCurrent() { if (!isset($this->_iscurrent)) { $page = $this->getPage(); $current = $page->getCurrentRevision(); $this->_iscurrent = $this->getVersion() == $current->getVersion(); } return $this->_iscurrent; } /** * Get the content as a string. * * @access public * * @return string The page content. * Lines are separated by new-lines. */ function getPackedContent() { $data = &$this->_data; if (empty($data['%content'])) { // Replace empty content with default value. return sprintf(_("Describe %s here."), "[". $this->_pagename ."]"); } // There is (non-default) content. assert($this->_version > 0); if (!is_string($data['%content'])) { // Content was not provided to us at init time. // (This is allowed because for some backends, fetching // the content may be expensive, and often is not wanted // by the user.) // // In any case, now we need to get it. $data['%content'] = $this->_get_content(); assert(is_string($data['%content'])); } return $data['%content']; } function _get_content() { $cache = &$this->_wikidb->_cache; $pagename = $this->_pagename; $version = $this->_version; assert($version > 0); $newdata = $cache->get_versiondata($pagename, $version, true); if ($newdata) { assert(is_string($newdata['%content'])); return $newdata['%content']; } else { // else revision has been deleted... What to do? return __sprintf("Acck! Revision %s of %s seems to have been deleted!", $version, $pagename); } } /** * Get meta-data for this revision. * * * @access public * * @param $key string Which meta-data to access. * * Some reserved revision meta-data keys are: *
*
'mtime'
Time this revision was created (seconds since midnight Jan 1, 1970.) * The 'mtime' meta-value is normally set automatically by the database * backend, but it may be specified explicitly when creating a new revision. *
orig_mtime *
To ensure consistency of RecentChanges, the mtimes of the versions * of a page must be monotonically increasing. If an attempt is * made to create a new revision with an mtime less than that of * the preceeding revision, the new revisions timestamp is force * to be equal to that of the preceeding revision. In that case, * the originally requested mtime is preserved in 'orig_mtime'. *
'_supplanted'
Time this revision ceased to be the most recent. * This meta-value is always automatically maintained by the database * backend. (It is set from the 'mtime' meta-value of the superceding * revision.) '_supplanted' has a value of 'false' for the current revision. * * FIXME: this could be refactored: *
author *
Author of the page (as he should be reported in, e.g. RecentChanges.) *
author_id *
Authenticated author of a page. This is used to identify * the distinctness of authors when cleaning old revisions from * the database. *
'is_minor_edit'
Set if change was marked as a minor revision by the author. *
'summary'
Short change summary entered by page author. *
* * Meta-data keys must be valid C identifers (they have to start with a letter * or underscore, and can contain only alphanumerics and underscores.) * * @return string The requested value, or false if the requested value * is not defined. */ function get($key) { if (!$key || $key[0] == '%') return false; $data = &$this->_data; return isset($data[$key]) ? $data[$key] : false; } /** * Get all the revision page meta-data as a hash. * * @return hash The revision meta-data. */ function getMetaData() { $meta = array(); foreach ($this->_data as $key => $val) { if (!empty($val) && $key[0] != '%') $meta[$key] = $val; } return $meta; } /** * Return a string representation of the revision. * * This is really only for debugging. * * @access public * * @return string Printable representation of the WikiDB_Page. */ function asString () { ob_start(); printf("[%s:%d\n", get_class($this), $this->get('version')); print_r($this->_data); echo $this->getPackedContent() . "\n]\n"; $strval = ob_get_contents(); ob_end_clean(); return $strval; } }; /** * A class which represents a sequence of WikiDB_Pages. */ class WikiDB_PageIterator { function WikiDB_PageIterator(&$wikidb, &$pages) { $this->_pages = $pages; $this->_wikidb = &$wikidb; } /** * Get next WikiDB_Page in sequence. * * @access public * * @return object The next WikiDB_Page in the sequence. */ function next () { if ( ! ($next = $this->_pages->next()) ) return false; $pagename = &$next['pagename']; if (isset($next['pagedata'])) $this->_wikidb->_cache->cache_data($next); return new WikiDB_Page($this->_wikidb, $pagename); } /** * Release resources held by this iterator. * * The iterator may not be used after free() is called. * * There is no need to call free(), if next() has returned false. * (I.e. if you iterate through all the pages in the sequence, * you do not need to call free() --- you only need to call it * if you stop before the end of the iterator is reached.) * * @access public */ function free() { $this->_pages->free(); } }; /** * A class which represents a sequence of WikiDB_PageRevisions. */ class WikiDB_PageRevisionIterator { function WikiDB_PageRevisionIterator(&$wikidb, &$revisions) { $this->_revisions = $revisions; $this->_wikidb = &$wikidb; } /** * Get next WikiDB_PageRevision in sequence. * * @access public * * @return object The next WikiDB_PageRevision in the sequence. */ function next () { if ( ! ($next = $this->_revisions->next()) ) return false; $this->_wikidb->_cache->cache_data($next); $pagename = $next['pagename']; $version = $next['version']; $versiondata = $next['versiondata']; assert(!empty($pagename)); assert(is_array($versiondata)); assert($version > 0); return new WikiDB_PageRevision($this->_wikidb, $pagename, $version, $versiondata); } /** * Release resources held by this iterator. * * The iterator may not be used after free() is called. * * There is no need to call free(), if next() has returned false. * (I.e. if you iterate through all the revisions in the sequence, * you do not need to call free() --- you only need to call it * if you stop before the end of the iterator is reached.) * * @access public */ function free() { $this->_revisions->free(); } }; /** * Data cache used by WikiDB. * * FIXME: Maybe rename this to caching_backend (or some such). * * @access protected */ class WikiDB_cache { // FIXME: beautify versiondata cache. Cache only limited data? function WikiDB_cache (&$backend) { $this->_backend = &$backend; $this->_pagedata_cache = array(); $this->_versiondata_cache = array(); array_push ($this->_versiondata_cache, array()); $this->_glv_cache = array(); } function close() { $this->_pagedata_cache = false; $this->_versiondata_cache = false; $this->_glv_cache = false; } function get_pagedata($pagename) { assert(is_string($pagename) && $pagename); $cache = &$this->_pagedata_cache; if (!isset($cache[$pagename]) || !is_array($cache[$pagename])) { $cache[$pagename] = $this->_backend->get_pagedata($pagename); if (empty($cache[$pagename])) $cache[$pagename] = array(); } return $cache[$pagename]; } function update_pagedata($pagename, $newdata) { assert(is_string($pagename) && $pagename); $this->_backend->update_pagedata($pagename, $newdata); if (is_array($this->_pagedata_cache[$pagename])) { $cachedata = &$this->_pagedata_cache[$pagename]; foreach($newdata as $key => $val) $cachedata[$key] = $val; } } function invalidate_cache($pagename) { unset ($this->_pagedata_cache[$pagename]); unset ($this->_versiondata_cache[$pagename]); unset ($this->_glv_cache[$pagename]); } function delete_page($pagename) { $this->_backend->delete_page($pagename); unset ($this->_pagedata_cache[$pagename]); unset ($this->_glv_cache[$pagename]); } // FIXME: ugly function cache_data($data) { if (isset($data['pagedata'])) $this->_pagedata_cache[$data['pagename']] = $data['pagedata']; } function get_versiondata($pagename, $version, $need_content = false) { // FIXME: Seriously ugly hackage if (defined ('USECACHE')){ //temporary - for debugging assert(is_string($pagename) && $pagename); // there is a bug here somewhere which results in an assertion failure at line 105 // of ArchiveCleaner.php It goes away if we use the next line. $need_content = true; $nc = $need_content ? '1':'0'; $cache = &$this->_versiondata_cache; if (!isset($cache[$pagename][$version][$nc])|| !(is_array ($cache[$pagename])) || !(is_array ($cache[$pagename][$version]))) { $cache[$pagename][$version][$nc] = $this->_backend->get_versiondata($pagename,$version, $need_content); // If we have retrieved all data, we may as well set the cache for $need_content = false if($need_content){ $cache[$pagename][$version]['0'] = $cache[$pagename][$version]['1']; } } $vdata = $cache[$pagename][$version][$nc]; } else { $vdata = $this->_backend->get_versiondata($pagename, $version, $need_content); } // FIXME: ugly if ($vdata && !empty($vdata['%pagedata'])) $this->_pagedata_cache[$pagename] = $vdata['%pagedata']; return $vdata; } function set_versiondata($pagename, $version, $data) { $new = $this->_backend-> set_versiondata($pagename, $version, $data); // Update the cache $this->_versiondata_cache[$pagename][$version]['1'] = $data; // FIXME: hack $this->_versiondata_cache[$pagename][$version]['0'] = $data; // Is this necessary? unset($this->_glv_cache[$pagename]); } function update_versiondata($pagename, $version, $data) { $new = $this->_backend-> update_versiondata($pagename, $version, $data); // Update the cache $this->_versiondata_cache[$pagename][$version]['1'] = $data; // FIXME: hack $this->_versiondata_cache[$pagename][$version]['0'] = $data; // Is this necessary? unset($this->_glv_cache[$pagename]); } function delete_versiondata($pagename, $version) { $new = $this->_backend-> delete_versiondata($pagename, $version); unset ($this->_versiondata_cache[$pagename][$version]['1']); unset ($this->_versiondata_cache[$pagename][$version]['0']); unset ($this->_glv_cache[$pagename]); } function get_latest_version($pagename) { if(defined('USECACHE')){ assert (is_string($pagename) && $pagename); $cache = &$this->_glv_cache; if (!isset($cache[$pagename])) { $cache[$pagename] = $this->_backend->get_latest_version($pagename); if (empty($cache[$pagename])) $cache[$pagename] = 0; } return $cache[$pagename];} else { return $this->_backend->get_latest_version($pagename); } } }; // Local Variables: // mode: php // tab-width: 8 // c-basic-offset: 4 // c-hanging-comment-ender-p: nil // indent-tabs-mode: nil // End: ?>