foam-framework
Version:
MVC metaprogramming framework
82 lines (73 loc) • 2.08 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: 'DelayedSelectDAO',
package: 'foam.core.dao',
help: "Apply this decorator to a DAO if you'd like to pretend that select accesses are slow.",
extends: 'foam.dao.ProxyDAO',
properties: [
{
model_: 'IntProperty',
name: 'initialDelay'
},
{
model_: 'IntProperty',
name: 'rowDelay'
}
],
methods: {
select: function(sink, options) {
sink = sink || [];
var f = afuture();
var self = this;
if ( Expr.isInstance(sink) ) {
setTimeout(function() {
self.delegate.select(sink, options)(f.set)
}, this.initialDelay);
return f.get;
}
var i = 0;
var delayedSink = {
pars: [],
put: function() {
var args = arguments;
this.pars.push(
function(ret) {
setTimeout(function() {
sink.put.apply(sink, args);
ret()
}, self.rowDelay * ++i );
});
},
eof: function() {
apar.apply(null, this.pars)(
function() {
sink && sink.eof && sink.eof();
f.set(sink);
});
},
error: function() {
sink && sink.error && sink.error.apply(sink, arguments);
}
};
setTimeout(function() {
self.delegate.select(delayedSink, options)
}, this.initialDelay);
return f.get;
}
}
});