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0
votes
1answer
22 views

Synchronization of resource that has moved out of requests filter range

I have a RESTful API with corresponding clients. If a client request fetches a set of resources (Events) based on a filter, say events taking place between 2015-04-13 - 2015-04-19. If an event which ...
0
votes
0answers
56 views

When should i sync my data from parse.com to my android app [on hold]

I'm making an android application whith parse.com. Here is the situation : I have an offline part on my android app and i'm using LDS (LocalData Storage) to stock my data and send them to parse.com. ...
0
votes
0answers
13 views

Is Event sourcing a good fit for database sync (master-multiple-slaves)?

I'm looking for a good way to maintain in sync local sqlite databases that could be offline to a master one, for a invoice app. Then I read about EventSourcing and Log structured storage and wonder ...
2
votes
2answers
56 views

Perfect time synchonization betweeen devices

I want to make two devices synchronize metronome over bluetooth/wifi. However I've got no idea how to make it perfectly synchronized. There are two possible solutions that I've found out: Naive -> ...
-2
votes
1answer
56 views

VCS a Vagrant box [closed]

I have two computers (1 Laptop with Ubuntu that I use for development in 99% of my time but I also have a pretty much unused PC with Windows. I also have an unused server machine at home. I would like ...
0
votes
2answers
63 views

Best Way To Store Images For Mobile Synchronization

The scenario is, I have a Web Dashboard (Developed using PHP + MySQL) and have Android and iOS Apps synchronizing data from the Web Dashboard (only one way i.e. Dashboard to Mobile Apps) Now the ...
1
vote
4answers
113 views

What's the best way to synchronise an event over multiple processes?

Imagine I have two distinct OS processes (the actual OS is unimportant). Process A is responsible for playing a video file. Process B is responsible for playing the audio that accompanies the video ...
0
votes
0answers
42 views

Syncing different nosql datasources efficiently

I have two dbs I am dealing with right now - Elasticsearch and Mongodb. Mongodb is legacy in the application in that I am not happy for its presence but it is there and in use, I am interested in ...
0
votes
1answer
83 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
119 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 ...
2
votes
5answers
169 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 ...
1
vote
0answers
106 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
117 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
32 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
132 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
200 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 ...
0
votes
1answer
186 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
147 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
votes
2answers
463 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
393 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 ...
2
votes
0answers
64 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
227 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
175 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
267 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
361 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 ...
1
vote
0answers
60 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
votes
2answers
132 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
563 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 ...
1
vote
3answers
222 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
271 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, ...
2
votes
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
vote
3answers
307 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
votes
1answer
108 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 ...
3
votes
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
376 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
175 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
votes
3answers
359 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
733 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
657 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
votes
6answers
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
votes
4answers
951 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
416 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
760 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 ...
25
votes
5answers
3k 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
324 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
votes
8answers
19k 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
453 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
14k 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 ...