forked from extern/egroupware
443 lines
12 KiB
JavaScript
443 lines
12 KiB
JavaScript
/**
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* eGroupWare eTemplate2
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*
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package etemplate
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* @subpackage api
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* @link http://www.egroupware.org
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* @author Andreas Stöckel
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* @copyright Stylite 2012
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* @version $Id$
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*/
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/*egw:uses
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egw_core;
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egw_debug;
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*/
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"use strict";
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egw.extend("data", egw.MODULE_APP_LOCAL, function (_app, _wnd) {
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var lastModification = null;
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/**
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* The uid function generates a session-unique id for the current
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* application by appending the application name to the given uid.
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*/
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function UID(_uid)
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{
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return _app + "::" + _uid;
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}
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function parseServerResponse(_result, _callback, _context)
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{
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// Check whether the result is valid -- so "result" has to be an object
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// consting of "order" and "data"
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if (!(_result && typeof _result.order !== "undefined"
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&& typeof _result.data !== "undefined"))
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{
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egw.debug("error", "Invalid result for 'dataFetch'");
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}
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// The "uidsMissing" contains a list of missing uids.
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var uidsMissing = [];
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if (_result.lastModification)
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{
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lastModification = _result.lastModification;
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}
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if (_result.order && _result.data)
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{
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// Assemble the correct order uids
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for (var i = 0; i < _result.order.length; i++)
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{
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_result.order[i] = UID(_result.order[i]);
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}
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// Load all data entries that have been sent or delete them
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for (var key in _result.data)
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{
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var uid = UID(key);
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if (_result.data[key] === null)
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{
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egw.dataDeleteUID(uid);
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}
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else
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{
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egw.dataStoreUID(uid, _result.data[key]);
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}
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}
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// Call the callback function and pass the calculated "order" array
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// as well as the "total" count and the "timestamp" to the listener.
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if (_callback)
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{
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_callback.call(_context, {
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"order": _result.order,
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"total": parseInt(_result.total),
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"readonlys": _result.readonlys,
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"rows": _result.rows
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});
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}
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}
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}
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return {
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/**
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* The dataFetch function provides an abstraction layer for the
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* corresponding "etemplate_widget_nextmatch::ajax_get_rows" function.
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* The server returns the following structure:
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* {
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* order: [uid, ...],
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* data:
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* {
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* uid0: data,
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* ...
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* uidN: data
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* },
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* total: <TOTAL COUNT>,
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* lastModification: <LAST MODIFICATION TIMESTAMP>,
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* readonlys: <READONLYS>
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* }
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* If a uid got deleted on the server above data is null.
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* If a uid is omitted from data, is has not changed since lastModification.
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*
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* If order/data is null, this means that nothing has changed for the
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* given range.
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* The dataFetch function stores new data for the uid's inside the
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* local data storage, the grid views are then capable of querying the
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* data for those uids from the local storage using the
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* "dataRegisterUID" function.
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*
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* @param execId is the execution context of the etemplate instance
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* you're querying the data for.
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* @param queriedRange is an object of the following form:
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* {
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* start: <START INDEX>,
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* num_rows: <COUNT OF ENTRIES>
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* }
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* The range always corresponds to the given filter settings.
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* @param filters contains the filter settings. The filter settings are
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* those which are crucial for the mapping between index and uid.
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* @param widgetId id with full namespace of widget
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* @param knownUids is an array of uids already known to the client.
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* This parameter may be null in order to indicate that the client
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* currently has no data for the given filter settings.
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* @param callback is the function that should get called, once the data
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* is available. The data passed to the callback function has the
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* following form:
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* {
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* order: [uid, ...],
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* total: <TOTAL COUNT>,
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* lastModification: <LAST MODIFICATION TIMESTAMP>,
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* readonlys: <READONLYS>
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* }
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* Please note that the "uids" comming from the server and the ones
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* being parsed to the callback function differ. While the uids
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* which are returned from the server are only unique inside the
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* application, the uids which are used on the client are "globally"
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* unique.
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* @param context is the context in which the callback function will get
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* called.
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*/
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dataFetch: function (_execId, _queriedRange, _filters, _widgetId,
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_callback, _context, _knownUids)
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{
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var lm = lastModification;
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if (_queriedRange["no_data"])
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{
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lm = 0xFFFFFFFFFFFF;
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}
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else if (_queriedRange["only_data"])
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{
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lm = 0;
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}
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var request = egw.json(
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"etemplate_widget_nextmatch::ajax_get_rows::etemplate",
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[
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_execId,
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_queriedRange,
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_filters,
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_widgetId,
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_knownUids ? _knownUids : egw.dataKnownUIDs(_app),
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lm
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],
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function(result) {
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parseServerResponse(result, _callback, _context);
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},
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this,
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true
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);
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request.sendRequest();
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}
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};
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});
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egw.extend("data_storage", egw.MODULE_GLOBAL, function (_app, _wnd) {
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/**
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* The localStorage object is used to store the data for certain uids. An
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* entry inside the localStorage object looks like the following:
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* {
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* timestamp: <CREATION TIMESTAMP (local)>,
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* data: <DATA>
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* }
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*/
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var localStorage = {};
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/**
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* The registeredCallbacks map is used to store all callbacks registerd for
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* a certain uid.
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*/
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var registeredCallbacks = {};
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/**
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* Uids and timers used for querying data uids, hashed by the first few
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* bytes of the _execId, stored as an object of the form
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* {
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* "timer": <QUEUE TIMER>,
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* "uids": <ARRAY OF UIDS>
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* }
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*/
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var queue = {};
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/**
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* Contains the queue timeout in milliseconds.
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*/
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var QUEUE_TIMEOUT = 10;
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/**
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* This constant specifies the maximum age of entries in the local storrage
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* in milliseconds
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*/
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var MAX_AGE = 5 * 60 * 1000; // 5 mins
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/**
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* This constant specifies the interval in which the local storage gets
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* cleaned up.
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*/
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var CLEANUP_INTERVAL = 30 * 1000; // 30 sec
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/**
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* Register a cleanup function, which throws away all data entries which are
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* older than the given age.
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*/
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_wnd.setInterval(function() {
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// Get the current timestamp
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var time = (new Date).getTime();
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// Iterate over the local storage
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for (var uid in localStorage)
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{
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if (time - localStorage[uid].timestamp > MAX_AGE)
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{
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// Unregister all registered callbacks for that uid
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egw.dataUnregisterUID(uid);
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// Delete the data from the localStorage
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delete localStorage[uid];
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}
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}
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}, CLEANUP_INTERVAL);
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return {
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/**
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* Registers the intrest in a certain uid for a callback function. If
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* the data for that uid changes or gets loaded, the given callback
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* function is called. If the data for the given uid is available at the
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* time of registering the callback, the callback is called immediately.
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*
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* @param _uid is the uid for which the callback should be registered.
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* @param _callback is the callback which should get called.
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* @param _context is the optional context in which the callback will be
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* executed
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* @param _execId is the exec id which will be used in case the data is
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* not available
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* @param _widgetId is the widget id which will be used in case the uid
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* has to be fetched.
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*/
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dataRegisterUID: function (_uid, _callback, _context, _execId, _widgetId) {
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// Create the slot for the uid if it does not exist now
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if (typeof registeredCallbacks[_uid] === "undefined")
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{
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registeredCallbacks[_uid] = [];
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}
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// Store the given callback
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registeredCallbacks[_uid].push({
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"callback": _callback,
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"context": _context ? _context : null
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});
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// Check whether the data is available -- if yes, immediately call
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// back the callback function
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if (typeof localStorage[_uid] !== "undefined")
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{
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// Update the timestamp and call the given callback function
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localStorage[_uid].timestamp = (new Date).getTime();
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_callback.call(_context, localStorage[_uid].data);
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}
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else if (_execId && _widgetId)
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{
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// Get the first 50 bytes of the exex id
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var hash = _execId.substring(0, 50);
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// Create a new queue if it does not exist yet
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if (typeof queue[hash] === "undefined")
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{
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var self = this;
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queue[hash] = { "uids": [], "timer": null };
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queue[hash].timer = window.setTimeout(function () {
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// Fetch the data
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self.dataFetch(_execId, {"start": 0, "num_rows": 0, "only_data": true},
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[], _widgetId, null, null, queue[hash].uids);
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// Delete the queue entry
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delete queue[hash];
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}, 10);
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}
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// Push the uid onto the queue
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queue[hash].uids.push(_uid.split("::").pop());
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}
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else
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{
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this.debug("log", "Data for uid " + _uid + " not available.");
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}
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},
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/**
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* Unregisters the intrest of updates for a certain data uid.
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*
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* @param _uid is the data uid for which the callbacks should be
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* unregistered.
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* @param _callback specifies the specific callback that should be
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* unregistered. If it evaluates to false, all callbacks (or those
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* matching the optionally given context) are removed.
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* @param _context specifies the callback context that should be
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* unregistered. If it evaluates to false, all callbacks (or those
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* matching the optionally given callback function) are removed.
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*/
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dataUnregisterUID: function (_uid, _callback, _context) {
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// Force the optional parameters to be exactly null
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_callback = _callback ? _callback : null;
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_context = _context ? _context : null;
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if (typeof registeredCallbacks[_uid] !== "undefined")
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{
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// Iterate over the registered callbacks for that uid and delete
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// all callbacks pointing to the given callback and context
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for (var i = registeredCallbacks[_uid].length - 1; i >= 0; i--)
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{
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if ((!_callback || registeredCallbacks[_uid][i].callback === _callback)
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&& (!_context || registeredCallbacks[_uid][i].context === _context))
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{
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registeredCallbacks[_uid].splice(i, 1);
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}
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}
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// Delete the slot if no callback is left for the uid
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if (registeredCallbacks[_uid].length === 0)
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{
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delete registeredCallbacks[_uid];
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}
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}
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},
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/**
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* Returns whether data is available for the given uid.
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*
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* @param uid is the uid for which should be checked whether it has some
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* data.
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*/
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dataHasUID: function (_uid) {
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return typeof localStorage[_uid] !== "undefined";
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},
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/**
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* Returns all uids that have the given prefix
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* TODO: Improve this
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*/
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dataKnownUIDs: function (_prefix) {
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var result = [];
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for (var key in localStorage)
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{
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var parts = key.split("::");
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if (parts[0] === _prefix && localStorage[key].data)
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{
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result.push(parts[1]);
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}
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}
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return result;
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},
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/**
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* Stores data for the uid and calls all callback functions registered
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* for that uid.
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*
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* @param _uid is the uid for which the data should be saved.
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* @param _data is the data which should be saved.
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*/
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dataStoreUID: function (_uid, _data) {
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// Get the current unix timestamp
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var timestamp = (new Date).getTime();
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// Store the data in the local storage
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localStorage[_uid] = {
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"timestamp": timestamp,
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"data": _data
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};
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// Inform all registered callback functions and pass the data to
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// those.
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if (typeof registeredCallbacks[_uid] != "undefined")
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{
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for (var i = registeredCallbacks[_uid].length - 1; i >= 0; i--)
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{
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try {
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registeredCallbacks[_uid][i].callback.call(
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registeredCallbacks[_uid][i].context,
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_data
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);
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} catch (e) {
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// Remove this callback from the list
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registeredCallbacks[_uid].splice(i, 1);
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}
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}
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}
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},
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/**
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* Deletes the data for a certain uid from the local storage and
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* unregisters all callback functions associated to it.
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*
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* @param uid is the uid which should be deleted.
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*/
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dataDeleteUID: function (_uid) {
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if (typeof localStorage[_uid] !== "undefined")
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{
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// Delete the element from the local storage
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delete localStorage[_uid];
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// Unregister all callbacks for that uid
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this.dataUnregisterUID(_uid);
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}
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}
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};
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});
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