foam-framework
Version:
MVC metaprogramming framework
304 lines (278 loc) • 7.85 kB
JavaScript
/**
* @license
* Copyright 2015 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
CLASS({
name: 'SyncManager',
package: 'foam.apps.quickbug.dao',
properties: [
{
name: 'queryParser',
hidden: true,
transient: true
},
{
name: 'srcDAO',
label: 'Source DAO',
type: 'DAO',
hidden: true,
transient: true
},
{
name: 'dstDAO',
label: 'Destination DAO',
type: 'DAO',
hidden: true,
transient: true
},
{
name: 'modifiedProperty',
type: 'Property',
hidden: true,
transient: true
},
{
model_: 'IntProperty',
name: 'itemsSynced',
mode2: 'read-only',
help: 'Number of items synced.'
},
{
model_: 'IntProperty',
name: 'timesSynced',
mode2: 'read-only',
help: 'Number of times sync has been performed.'
},
{
model_: 'IntProperty',
name: 'syncInterval',
help: 'Delay after empty sync response.',
units: 's',
defaultValue: 60
},
{
model_: 'IntProperty',
name: 'delay',
label: 'Delay',
help: 'Delay after a non-empty sync response.',
units: 's',
defaultValue: 0
},
{
model_: 'IntProperty',
name: 'batchSize',
help: 'Maximum number of items per sync request; 0 for unlimited.',
defaultValue: 0
},
{
model_: 'StringProperty',
name: 'syncStatus',
displayWidth: 40,
help: 'Current status of the sync process.',
transient: true
},
{
model_: 'IntProperty',
name: 'lastBatchSize',
help: 'Number of item updates returned in last sync response.',
transient: true
},
{
model_: 'DateTimeProperty',
name: 'lastSync',
help: 'The time of the last sync.',
factory: function() { return new Date(); }
},
{
model_: 'DateTimeProperty',
name: 'lastModified',
help: 'The time of the last sync.',
factory: function() { return new Date(); },
transient: true
},
{
model_: 'IntProperty',
name: 'lastSyncDuration',
help: 'Duration of last sync request.',
units: 'ms',
transient: true
},
{
model_: 'BooleanProperty',
name: 'enabled',
mode2: 'read-only',
help: 'If the Sync Manager is currently enabled to perform periodic sync requests.',
transient: true
},
{
model_: 'BooleanProperty',
name: 'isSyncing',
mode2: 'read-only',
help: 'If the Sync Manager is currently syncing.',
transient: true
},
{
model_: 'StringProperty',
name: 'lastId',
help: 'The id of the last item synced.',
transient: true
},
{
model_: 'StringProperty',
name: 'query',
displayWidth: 33,
displayHeight: 4,
help: 'Only sync items which match this query.'
},
{
model_: 'IntProperty',
name: 'maxSyncAge',
defaultValue: 6 * 24 * 60 * 60 * 1000,
help: 'How old our database is allowed to be before we just toss it and start over.'
}
],
actions: [
{
name: 'start',
help: 'Start the Sync Manager.',
isEnabled: function() {
var enabled = this.enabled;
return ! this.enabled;
},
code: function() { this.enabled = true; this.sync(); }
},
{
name: 'forceSync',
help: 'Perform a single sync request.',
isEnabled: function() {
var isSyncing = this.isSyncing;
return ! isSyncing;
},
code: function() {
clearTimeout(this.timer);
this.sync();
}
},
{
name: 'stop',
help: 'Stop the timer.',
// TODO: abort current sync
isEnabled: function() {
var enabled = this.enabled;
var isSyncing = this.isSyncing;
return enabled || isSyncing;
},
code: function() {
this.enabled = false;
this.abortRequest_ = true;
clearTimeout(this.timer);
}
},
{
name: 'reset',
help: 'Reset the Sync Manager to force a re-sync of all data.',
isEnabled: function() { return ! this.enabled; },
code: function(ret) {
this.itemsSynced = 0;
this.timesSynced = 0;
this.lastSyncDuration = 0;
this.lastId = '';
this.lastSync = this.model_.LAST_SYNC.factory.call(this);;
this.lastModified = this.model_.LAST_MODIFIED.factory.call(this);
}
}
],
methods: {
init: function() {
this.SUPER();
var self = this;
},
doReset: function(ret) {
console.log("Doing reset...");
this.reset();
this.dstDAO.removeAll()(ret)
},
sync: function(ret) {
var self = this;
if ( this.isSyncing ) return;
aseq(
function(ret) {
if ( Date.now() - self.lastSync.getTime() > self.maxSyncAge )
self.doReset(ret);
else
ret();
},
(function(ret) {
var batchSize = this.batchSize;
var startTime = Date.now();
var lastBatchSize = 0;
this.abortRequest_ = false;
this.isSyncing = true;
this.syncStatus = 'Syncing...';
var dao = this.srcDAO;
if ( this.batchSize > 0 ) dao = dao.limit(batchSize);
var delay = this.syncInterval;
if ( this.queryParser && this.query ) {
var p = this.queryParser.parseString(this.query.replace(/\s+/g, ' '));
if ( p ) {
p = p.partialEval();
// console.log('sync query: ', p.toMQL());
dao = dao.where(p);
}
}
dao
.where(GT(this.modifiedProperty, this.lastModified))
.orderBy(this.modifiedProperty)
.select({
put: function(item, _, fc) {
if ( self.abortRequest_ ) {
fc.stop();
self.abortRequest_ = false;
}
self.itemsSynced++;
self.lastId = item.id;
if ( item[self.modifiedProperty.name].compareTo(self.lastModified) > 0 ) {
self.lastModified = item[self.modifiedProperty.name];
delay = self.delay;
}
lastBatchSize++;
self.dstDAO.find(item.id, {
put: function() {
self.dstDAO.put(item);
}
});
self.dstDAO.put(item);
},
error: function() {
console.assert(false, 'SyncManager: sync error');
}
})(function() {
self.timesSynced++;
self.lastSyncDuration = Date.now() - startTime;
self.lastBatchSize = lastBatchSize;
self.syncStatus = '';
self.lastSync = new Date();
self.isSyncing = false;
self.schedule(delay);
ret();
});
}).bind(this))(ret || function(){});
},
schedule: function(syncInterval) {
if ( ! this.enabled ) return;
this.timer = setTimeout(this.sync.bind(this), syncInterval * 1000);
}
}
});