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0answers
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Best method to synchronize data from an eCommerce platform

I have been assigned to design a high level architecture for an plugin, aimed at fetching and syncing product data from an open source eCommerce platform. The eCommerce platform allows development of ...
0
votes
1answer
54 views

trigger chat across multiple devices?

I am building up a chat app. I am struggling with the idea of syncronizing the chat messages in real time. My Scenario : trigger chat messages(incoming and outgoing) on multiple devices ...
-1
votes
1answer
61 views

Approaches for manage AD users inside my HR system [closed]

I want to start a new HR web application based on asp.net mvc-5 & Entity Framework. as it is almost the case Users inside the HR system will exists inside the AD, and when a new user join our ...
1
vote
4answers
73 views

A separate endpoint specifically for sync in a REST api

I am working on a multi client/single server app. Communication between the two happens via RESTful API. There are several resources that need to stay in sync across all clients, including images ...
0
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0answers
29 views

Syncing structured data and files in Android App with an ORM?

I am developing an Android App which I have developed for iOS before. The app requires that structured data and files are synced across android devices. In iOS, I was using Core Data and synced to ...
0
votes
1answer
39 views

Data Sync between Android apps in LAN

I am looking at developing an app which has quite an extensive database. This app will be installed on multiple devices in a LAN and all users can update the data and other users will see the data as ...
2
votes
1answer
29 views

performance issues when synchronizing on an interned String

I want to lock a remote file with the string "ip + filename" using java. public boolean execCmd(String ip,String filename, String command) { String file = ip + filename; String lock = ...
1
vote
1answer
60 views

Synchronization between two systems using MongoDB as changelog

We are developing two related system. One of them (A) will be installed in our customers' machines. The remaining (B) will be used by my organization. Each system has its own database (relational) ...
0
votes
3answers
143 views

Developing “real” synchronization [closed]

I'm currently writing a email synchronizer application that synchronizes email to a sql server database. One direction is not a problem: Fetching folders from the server (with its messages) and ...
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0answers
73 views

Custom Sync process and how to prevent SQL injection

I have a custom sync process where I need to ensure that there's no possibility of SQL injection. For background, the device stores records in a Sqlite database, whereas our central server is Sql ...
0
votes
1answer
113 views

LDAP users synchronization [closed]

I'm looking for a way to synchronize a users database between a piece of software and a ldap directory. Currently I'm thinking of three possibilities to keep the track of a specific user : Guid : it ...
1
vote
1answer
137 views

Synchronized access to network industrial equipment

I have an industrial equipment which is controlled by a software. The software connects to it using sockets, and keeps the connection all the time alive, while from time to time sending commands to ...
0
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2answers
213 views

Real time data synchronization techniques between two systems

I need to come up with a design for real-time data update from a COTS product (a Point of Sales system) to a custom-built .NET application (an Inventory Management system). Particularly, any sales ...
3
votes
1answer
202 views

How to implement await in Android

This is a general question to understand how await in C# works, and particularly I am interested in implementing it in Android. So C# await allows you to go in to waiting mode in the middle of the ...
1
vote
0answers
44 views

Synchronizing web ui and third party async services

I'm looking for concepts, approaches or even Framework/libraries to help me synchronize state reliably from web UI to a third Party Service. For example: creating a JavaScript irc Client ui you need ...
3
votes
2answers
159 views

Combining asynchronous and synchronous programming

I've got trouble wrapping my head around a certain problem: In my data-flow app (a visual editor), I have both autonomous objects which communicate though ports via unordered simultaneous messages ...
2
votes
3answers
161 views

How much time should you allow for clock skew?

We are writing a B2B application that uses OAuth 2.0. Before a token expires we want to refresh it since it faster to refresh a token, than request a new one. However, we want to build in some ...
0
votes
3answers
222 views

MVC pattern synchronisation

I am facing a problem in synchronizing my model and view threads I have a view which is table. In it, user can select a few rows. I update the view as soon as the user clicks on any row since I don't ...
2
votes
2answers
300 views

Programmatically syncing with remote servers

My application generates text files that need to be synced with remote servers, which may be windows or linux. Sync has to happen without user's intervention. I tried with rsync but windows doesn't ...
0
votes
0answers
53 views

Modelling network and persistent entity representations

I have an app where I need to synchronize some entities (simply download latest versions of entities from server to client). Entity has bunch of text properties and bunch of resource links (referenced ...
0
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2answers
101 views

Locking techniques

Delphi RAD libraries implement many thread friendly objects in a way which forces one to declare another object for storing the reference returned by that object's locking method. The object thus ...
0
votes
1answer
410 views

sqlite trigger or application event?

I've have two event queues(table mapped queues) based on two different states of same data stored in two different tables. The events are generated on create/update/delete on both the tables. ...
0
votes
2answers
61 views

Methods to keep an external service up to date that polls your service periodically?

Sorry if the title is hard to understand, it is easier if I describe the scenario to get the question across. I have a service that collects data, performs business logic and does all the normal ...
0
votes
0answers
230 views

Numerous Sync/Async calls to webservice from hybrid app

I have a requirement where I have to make numerous calls to webservice to update the local database. Since I have to support lower-end Android phones also, I'm not yet sure as to how this would be ...
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3answers
215 views

A pattern to “atomically” update a pair of objects

Is there a standard pattern in OOP to kind of "atomically" update a pair of objects, like a pair of bank accounts on a transaction? I would like to have somehow a single public method exposed that ...
1
vote
2answers
240 views

An algorithm for a synchronization

I want to make a synchronization. What's the algorithm for it in a nutshell? 1) A client reads a local data and sends them to a server afterwards. The server compares them with its actual data, ...
1
vote
1answer
2k views

How to make a method synchronized across all instances of an object

Today I was asked this interview question and could not answer. : If you have two instances of a Person Object and each of them have a setAddres method that is synchronized. Now if it was only one ...
1
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3answers
292 views

Synchronization in the given Code

I had an interview few weeks back, and I was asked to write a code with Setters and Getters. I had written the following code; // Just an example Class ABC{ private int num; public void ...
0
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1answer
97 views

Implementation details of database synchronisation API

I want to achieve a database synchronisation between my server database and a client application. The server would run MySQL and the applications may run different database technologies, their ...
2
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0answers
1k views

Solutions for iOS collaborative sync (iCloud CoreData, CouchDB)?

I'm developing an iOS app where one of the features will be allowing users to share and collaborate on data (e.g. lists). From everything I've read and based on the way that iCloud CoreData sync works ...
2
votes
1answer
329 views

Difference between mutex in windows and linux

Is that correct that a mutex object in Linux cannot be used for cross process synchronization as opposed to its Windows counterpart? If that is true - what was the idea to limit mutex synchronisation ...
0
votes
1answer
161 views

The best approach to building a mobile service that's also available when the connection drops?

Hopefully this question will be a good suit for P.SE since it is a whiteboard-level 'how can this be done' conceptual question. I'm trying to build a product that needs to be available to someone on ...
0
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3answers
327 views

Keeping SQL Server DB Up to date in Team environment [duplicate]

We are working in a Visual Studio Environment using TFS. When developers get the latest source code it includes a copy of the 'update' sql scripts for the database of the application. The challenge ...
3
votes
2answers
618 views

Is it a bad idea to sync file system with remote server using HTTP?

I have started a project which will duplicate Dropbox or Google Drive behavior but using Amazon S3 az a backend. Idea is very simple, a Node.js server that watchs a directory for file changes and PUT ...
4
votes
2answers
555 views

caching on multiple servers

Because we need to keep response times low, we get tons of requests, and we need to basically process ALMOST the same data (which I'll refer to as X) each request (the inputs are different though, so ...
3
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5answers
3k views

Is it possible to half-way synchronize javascript functions that include async calls?

I am wondering if there exists a way to half way synchronize javascript functions, where data is requested on the fly. I don't want to make it purely blocking (which I guess is impossible), I just ...
2
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4answers
827 views

Best practice to sync long paths to filesystems where path length is limited?

I wrote a sync tool to synchronize folders/files from Alfresco to Windows. PROBLEM: In Alfresco, /files/can/have/very/very/very/long/filepaths/like/this.txt The Windows API prevents me from creating ...
8
votes
2answers
2k views

Is it time to deprecate synchronized, wait and notify?

Is there a single scenario (other than compatibility with ancient JVMs) where using synchronized is preferable to using a Lock? Can anyone justify using wait or notify over the newer systems? Is ...
5
votes
1answer
374 views

What's a good scheme for multi-user database synchronization?

I'm working on a system to allow multiple users to collaborate on an online project. Everything is fairly straightforward, except for keeping the users in sync. Each user has their own local copy of ...
0
votes
2answers
696 views

Syncing objects to a remote server, and caching on local storage

What's the best method of sycing objects (as JSON) to a remote server, with local caching? I have some objects that will pretty much just be plain-text with some extra meta-data. I was thinking of ...
24
votes
5answers
2k views

Does immutability entirely eliminate the need for locks in multi-processor programming?

Part 1 Clearly Immutability minimizes the need for locks in multi-processor programming, but does it eliminate that need, or are there instances where immutability alone is not enough? It seems to ...
2
votes
1answer
313 views

Does Dropbox use a cronjob to sync up? [closed]

I was looking into lipsync on a Dropbox clone. I was looking at the diagram on how it works here. It shows that a cronjob is used to keep files in sync between client and server. Does that mean that ...
15
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8answers
17k views

Multithreading synchronization interview question: Find n words given m threads

I came across this question: You are given a paragraph , which contain n number of words, you are given m threads. What you need to do is , each thread should print one word and give the ...
7
votes
3answers
433 views

How do most sync programs monitor file changes?

Do sync programs like Dropbox typically track file changes by doing byte by byte comparisons, or using hashes, or using diff / keeping local commit logs like version control, or what?
7
votes
2answers
12k views

When should I use StringBuilder or StringBuffer?

In a production web application, my fellow programmers used StringBuffer everywhere. Now I am taking care of application development and corrections. After reading StringBuilder and StringBuffer I ...
15
votes
2answers
4k views

Conflict resolution for two-way sync

How do you manage two-way synchronization between a 'main' database server and many 'secondary' servers, in particular conflict resolution, assuming a connection is not always available? For example, ...
0
votes
1answer
820 views

Best way to update UI when dealing with data synchronization

I'm working on a bug at work. The app is written in Objective-C for iOS based device, for the iPad. I'm the new guy there and I've been given a hard task. Sometimes, the UIButton text property does ...
4
votes
1answer
1k views

What is a good design pattern / lib for iOS 5 to synchronize with a web service?

We are developing an iOS application that needs to synchronize with a remote server using web services. The existing web services have an "operations" style rather than REST (implemented in WCF but ...
3
votes
5answers
398 views

New application development - Use existing database or create a new one?

A Client has a huge Windows Application running on a Database. This client wants you to develop an "Express" version of this application, including only, let's say, 20% of its features. This Express ...
7
votes
1answer
2k views

Atomic Memcache Operations in PHP

This post is a follow up to this question: PHP Atomic Memcache on StackOverflow. Considering I am using Memcache (no d at the end) on PHP 5.3.10, I implemented a custom locking system where a client ...