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347 lines
12 KiB
JavaScript
347 lines
12 KiB
JavaScript
/**
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* Copyright (C) 2013 KO GmbH <copyright@kogmbh.com>
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*
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* @licstart
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* This file is part of WebODF.
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*
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* WebODF is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Affero General Public License (GNU AGPL)
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* as published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* WebODF is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with WebODF. If not, see <http://www.gnu.org/licenses/>.
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* @licend
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*
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* @source: http://www.webodf.org/
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* @source: https://github.com/kogmbh/WebODF/
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*/
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/*global define, runtime, core, ops*/
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define("webodf/editor/backend/jsglobal/OperationRouter", [], function () {
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"use strict";
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var /**@const @type {!string}*/
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EVENT_BEFORESAVETOFILE = "beforeSaveToFile",
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/**@const @type {!string}*/
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EVENT_SAVEDTOFILE = "savedToFile",
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/**@const @type {!string}*/
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EVENT_HASLOCALUNSYNCEDOPERATIONSCHANGED = "hasLocalUnsyncedOperationsChanged",
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/**@const @type {!string}*/
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EVENT_HASSESSIONHOSTCONNECTIONCHANGED = "hasSessionHostConnectionChanged";
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runtime.loadClass("ops.OperationTransformer");
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runtime.loadClass("core.EventNotifier");
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runtime.loadClass("core.Task");
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/**
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* @constructor
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* @implements ops.OperationRouter
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*/
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return function JsGlobalOperationRouter(sessionId, memberId, server, errorCallback) {
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var events = new core.EventNotifier([
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ops.OperationRouter.signalProcessingBatchStart,
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ops.OperationRouter.signalProcessingBatchEnd,
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EVENT_HASLOCALUNSYNCEDOPERATIONSCHANGED,
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EVENT_HASSESSIONHOSTCONNECTIONCHANGED,
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EVENT_BEFORESAVETOFILE,
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EVENT_SAVEDTOFILE
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]),
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/**@type{!ops.OperationFactory}*/
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operationFactory,
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playbackFunction,
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operationTransformer = new ops.OperationTransformer(),
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/**@type{number}*/
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groupIdentifier = 0,
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uploadingOpSpecCount,
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syncTask,
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unsyncedClientOpspecQueue = [],
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hasLocalUnsyncedOps = false,
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hasSessionHostConnection = true,
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hasUnresolvableConflict = false,
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syncInProgress = false,
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syncAttemptCompleteCallbacks = [],
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successfulSyncCallbacks = [],
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destroyed = false;
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/**
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* @return {undefined}
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*/
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function updateUnsyncedOps() {
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var hasLocalUnsyncedOpsNow = (unsyncedClientOpspecQueue.length > 0);
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// no change?
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if (hasLocalUnsyncedOps === hasLocalUnsyncedOpsNow) {
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return;
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}
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hasLocalUnsyncedOps = hasLocalUnsyncedOpsNow;
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events.emit(EVENT_HASLOCALUNSYNCEDOPERATIONSCHANGED, hasLocalUnsyncedOps);
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}
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/**
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* @return {!boolean}
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*/
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this.hasLocalUnsyncedOps = function() {
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return hasLocalUnsyncedOps;
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};
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/**
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* @param {!boolean} hasConnection
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* @return {undefined}
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*/
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function updateHasSessionHostConnectionState(hasConnection) {
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// no change?
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if (hasSessionHostConnection === hasConnection) {
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return;
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}
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hasSessionHostConnection = hasConnection;
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events.emit(EVENT_HASSESSIONHOSTCONNECTIONCHANGED, hasSessionHostConnection);
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}
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/**
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* @return {!boolean}
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*/
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this.hasSessionHostConnection = function () {
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return hasSessionHostConnection;
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};
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/**
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* Sets the factory to use to create operation instances from operation specs.
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*
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* @param {!ops.OperationFactory} f
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* @return {undefined}
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*/
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this.setOperationFactory = function (f) {
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operationFactory = f;
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};
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/**
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* Sets the method which should be called to apply operations.
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*
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* @param {!function(!ops.Operation):boolean} playback_func
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* @return {undefined}
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*/
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this.setPlaybackFunction = function (playback_func) {
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playbackFunction = playback_func;
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};
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/**
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* Brings the locally created operations into the game.
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*
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* @param {!Array.<!{optype:!string}>} operationSpecs
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* @return {undefined}
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*/
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function executeOpSpecs(operationSpecs) {
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// This is an extremely simplistic and VERY temporary implementation of operation grouping.
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// In order to improve undo behaviour, the undo manager requires knowledge about what groups
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// of operations were queued together, so these can be stored in a single undo state.
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// The current implementation is only designed for a localeditor instance & the TrivialUndoManager.
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// TODO redesign this concept to work with collaborative editing
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groupIdentifier += 1;
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events.emit(ops.OperationRouter.signalProcessingBatchStart, {});
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operationSpecs.forEach(function (opspec) {
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var /**@type{?ops.Operation}*/
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timedOp;
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timedOp = operationFactory.create(opspec);
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timedOp.group = "g" + groupIdentifier;
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// TODO: handle return flag in error case
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playbackFunction(timedOp);
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});
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events.emit(ops.OperationRouter.signalProcessingBatchEnd, {});
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}
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/**
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* Executes local operations and prepares to send to these to the collab server
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*
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* @param {!Array.<!ops.Operation>} operations
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* @return {undefined}
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*/
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this.push = function (operations) {
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if (hasUnresolvableConflict) {
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throw new Error("unresolvableConflictingOps");
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}
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var specs = [],
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timestamp = Date.now();
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operations.forEach(function(op) {
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var spec = op.spec();
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spec.timestamp = timestamp;
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specs.push(spec);
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});
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unsyncedClientOpspecQueue = unsyncedClientOpspecQueue.concat(specs);
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executeOpSpecs(specs);
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updateUnsyncedOps();
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syncTask.trigger();
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};
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/**
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* @param {function()} cb
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*/
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this.close = function (cb) {
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function internalDestroy() {
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destroyed = true;
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syncTask.destroy(cb);
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}
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syncAttemptCompleteCallbacks.push(internalDestroy);
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syncTask.triggerImmediate();
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if (!syncInProgress) {
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internalDestroy();
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}
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};
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/**
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* @param {!string} eventId
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* @param {!Function} cb
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* @return {undefined}
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*/
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this.subscribe = function (eventId, cb) {
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events.subscribe(eventId, cb);
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};
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/**
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* @param {!string} eventId
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* @param {!Function} cb
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* @return {undefined}
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*/
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this.unsubscribe = function (eventId, cb) {
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events.unsubscribe(eventId, cb);
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};
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/**
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* Complete the current synchronize request
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* @param {!boolean=} connectionState If specified, update the session host connection state.
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* @return {undefined}
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*/
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function completeSyncRequest(connectionState) {
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syncInProgress = false;
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updateUnsyncedOps();
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if (connectionState !== undefined) {
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updateHasSessionHostConnectionState(connectionState);
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}
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syncAttemptCompleteCallbacks.forEach(function(cb) {
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cb();
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});
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syncAttemptCompleteCallbacks.length = 0;
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if (!destroyed) {
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syncTask.cancel();
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syncTask.trigger();
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}
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}
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/**
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* Log a synchronization error and retry
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* @param {!Error} e
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* @return {undefined}
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*/
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function logErrorAndRetry(e) {
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var isConnected;
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switch (e.code) {
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case "SEQ_OUTOFDATE":
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// This error is an expected as part of normal operation. Don't bother logging
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isConnected = true;
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break;
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case "SERVICE_UNAVAILABLE":
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// This error is an expected as part of normal operation. Don't bother logging.
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// However, the error does indicate a connectivity problem with the session, so
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// ensure the connection status is updated
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isConnected = false;
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break;
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default:
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isConnected = false;
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runtime.log(e);
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break;
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}
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completeSyncRequest(isConnected);
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}
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/**
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* Remove synchronized client ops off the client queue
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* @return {undefined}
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*/
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function onPushSuccess() {
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// Only remove operations that have now been uploaded to the remote service
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unsyncedClientOpspecQueue.splice(0, uploadingOpSpecCount);
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completeSyncRequest(true);
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successfulSyncCallbacks.forEach(function(cb) {
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cb();
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});
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successfulSyncCallbacks.length = 0;
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}
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/**
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* Process remote changes
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* @param {!{specs: !Array.<!Object>, sequenceId: !Object}} remoteChanges
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* @return {undefined}
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*/
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function onRemoteChangesSuccess(remoteChanges) {
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var transformResult = operationTransformer.transform(unsyncedClientOpspecQueue, remoteChanges.specs);
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if (!transformResult) {
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hasUnresolvableConflict = true;
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errorCallback("unresolvableConflictingOps");
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completeSyncRequest();
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return;
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}
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if (transformResult.opSpecsB.length > 0) {
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// Apply remote changes that have been transformed against local updates
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executeOpSpecs(transformResult.opSpecsB);
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}
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// The local client changes are now transformed against the current remote updates, and should not be transformed again.
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// Update the local sync queue with the translated results in case the push attempt fails due to a conflict
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unsyncedClientOpspecQueue = transformResult.opSpecsA;
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// Send local changes that have been transformed against the remote updates
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uploadingOpSpecCount = unsyncedClientOpspecQueue.length;
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if (unsyncedClientOpspecQueue.length > 0) {
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server.getJsGlobalServer().push(sessionId, memberId, remoteChanges.sequenceId, unsyncedClientOpspecQueue, onPushSuccess, logErrorAndRetry);
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} else {
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onPushSuccess();
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}
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}
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/**
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* DO NOT CALL DIRECTLY, use syncTask.trigger instead.
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*
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* Synchronize the local state with the remote server. This is an async call and will return immediately, while
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* the processing occurs in the background.
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*
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* @return {undefined}
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*/
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function synchronizeWithServer() {
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if (hasUnresolvableConflict === false && syncInProgress === false) {
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syncInProgress = true;
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server.getJsGlobalServer().getRemoteChanges(sessionId, memberId, onRemoteChangesSuccess, logErrorAndRetry);
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}
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}
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this.requestReplay = function(cb) {
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if (hasUnresolvableConflict) {
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throw new Error("unresolvableConflictingOps");
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}
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successfulSyncCallbacks.push(cb);
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syncTask.triggerImmediate();
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};
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function init() {
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syncTask = core.Task.createTimeoutTask(synchronizeWithServer, 100);
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}
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init();
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};
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});
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