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14 views

How Do DB Version Control Systems Lack in Script Semantics When Modeled on Souce/Target Difference Comparisons

There are several database version control solutions out there to assist with controlling not only the versioning of a database, but also deploying and synchronizing databases. These systems are ...
1
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0answers
28 views

Vector clock conflict resolution in event sourced system via local timestamp - is this safe?

We have an occasionally connected, event sourced system: a budgeting application where each client can pull other client's event store from a separate storage (network share, dropbox,...). It is our ...
1
vote
1answer
36 views

Web service + sync database + main application architecture

I got to develop a web service that will help synchronize some of our data with APIs from Google, as well other services in the future. I thought, and my boss too, we should go for a stand alone web ...
1
vote
1answer
38 views

How to synchronize data between two web services

I'm currently working on a project consisting of two different web applications. One of the applications is a PHP web server with a website front-end and a MySQL database. It consists of Laravel ...
2
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3answers
139 views

Data from devices with unreliable clocks

Are there any viable approaches to dealing with data coming from devices with unreliable clocks? We have a database system running on a central server. The latest addition to the system is a bunch of ...
0
votes
1answer
22 views

Terminology for partial offline database synchronization

I am looking for solutions for a field where I think I don't know the adequate terminology. The problem is that I have a central SQL database in the cloud. Then I have child databases only containing ...
2
votes
2answers
62 views

Technique to sync medium/large amounts of data

I implemented sync for my app (with a REST backend), it works well but there are some problems: Blocks - Since I don't want to overwrite possible inputs of the user during sync, I block the UI (...
1
vote
1answer
40 views

Android: Design for fetching update/syncing from server

I'm building a meeting app where users can create, join (by invite), and edit events like meetings, outings etc. Think What's app chat groups. So I'm looking into designing how the android app would ...
3
votes
2answers
67 views

How do you address the problem of dealing with an external service that stores your data and you want to keep in sync?

I'm integrating an enterprise application with an existing pattern. The main problem is how to synchronize data between my system and an external system through RPC (HTTP API calls to be precise). ...
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0answers
30 views

conflict free sync protocol with offline clients?

reading on the taskd server, it is a central server where clients can update a to-do list. The clients can edit the list offline and then sync with the central server, and the authors claim "conflict ...
0
votes
1answer
128 views

Synchronisation with offline system

I'm designing a system from which I will synchronise business data from mobile device that have an embedded application that generates datas and send them back to the server. Each line synchronised ...
1
vote
1answer
39 views

Process synchronization over Internet

I'm trying to create an IOT hub that can be controlled locally (Intranet) or from Internet. The problem I'm facing is of state synchronization. The following points depict what's happening at my local ...
0
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0answers
32 views

What does synchronous communication with an application mean?

An example of documentation: To set up synchronous communication with Google Play What does synchronous communication means here? Synchronous to what? And what would asynchronous communication ...
2
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1answer
30 views

Remote job execution and synchronization

I have master and nodes infrastructure. Master executes remote jobs on nodes. Each job returns success/failure message back to master. So the flow of execution is the following: master receives ...
0
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1answer
63 views

Generic approach to sharing of items

I have been thinking about this a few days already, doing diagrams, started programming, reverted, started again, still can't decide which is the best approach. The problem is about sharing groups ...
4
votes
2answers
354 views

Understanding the Single-Writer Principle

The article on the Single-Writer Principle of the Mechanical Sympathy blog explains how bad queues are (performance-wise), because they need to be able to receive messages from multiple produers, and ...
4
votes
2answers
230 views

A simple approach for data synchronisation

I want to synchronise the local database of mobile devices with the server's database. This synchronisation will happen for example when user comes online, to update the local as well as the remote ...
1
vote
1answer
94 views

Setting up my inheritance model?

I'm working on refactoring a synchronization web app that our company uses. Currently it's merely a set of controllers that fire up a set of helpers that go through a long chain of if-else type ...
1
vote
3answers
97 views

Best approach for realtime sync + shared todo?

I'm implementing an app that has among other things shared todo lists. I want it to sync in real time. This has to work for "normal" single user items (e.g. user has app opened in 2 devices, doing an ...
2
votes
1answer
29 views

Mechanisms to ensure distributed systems do not sychchronize (anti-synchronize)

We have a service that based on a local timer does a GET request to our server on Azure to transmit some information to be saved on the server. At this stage we are only testing and we are finding ...
2
votes
1answer
225 views

Conflict resolution for two-way sync offline 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(offline ...
3
votes
2answers
109 views

Best way to develop new features as well as fix any bugs for a web system on Windows [closed]

I'm a one-man band and I have a contract with a client to develop and maintain a web-based system that is relied upon. This is the first project of this size and type that I have done for anyone else ...
31
votes
5answers
4k views

No central database

I have a client that is looking to get a website/mobile apps/desktop apps built that deal with very sensitive data (more sensitive than bank/card details). Because of the sensitive nature of the data, ...
1
vote
1answer
245 views

Synchronize database with external API

I currently own a website where players can look-up their statistics of a game. When someone that is not in my database yet requests their statistics, I am calling the API with a PHP cURL request and ...
0
votes
1answer
100 views

Non-synchronized method that calls synchronized methods only [closed]

Is it safe to make a non-synchronized method if it only calls synchronized methods? Say we have: public class SomeClass{ public synchronized void A(){ //Some code } public ...
1
vote
3answers
529 views

What's the best way to track updates when syncing data from MySQL remote server to local SQLite database?

I'm making an iOS App, well, two actually. App A will be able to write TO-DOs to a remote MySQL database, and App B will be able to read what App A has written/modified. App B needs to be always up-to-...
2
votes
2answers
5k views

Best way to synchronize data between two different databases

I have to implement data synchronization between two big databases which have completely different structures. Basically, I need to grap some data about products in different tables in the first ...
1
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3answers
2k views

Can multiple synchronized methods in same object run concurrently

As far as i know when there are multiple synchronized methods(both static and instance) in a class, java allows only one such method to run at a time. But what if a thread acquires lock on an object ...
6
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0answers
142 views

Explicit DAG instead of Vector Clocks for synchronisation

I've started looking at approaches to data synchronisation among a set of peers. The peers must be able to work in a disconnected way and then synchronise together to merge their local changes. Peers ...
3
votes
2answers
529 views

Do I need a web-service for this case? Data-synchronization over multiple clients

I'm new in this area and a little bit confused about my current thoughts on a web-service implementation for my application. I want to synchronize all connected clients with the current data on a ...
3
votes
1answer
99 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 ...
1
vote
0answers
171 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
64 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
114 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 ...
1
vote
2answers
318 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 ...
3
votes
4answers
659 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 ...
-1
votes
1answer
234 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
652 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 ...
2
votes
0answers
281 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
535 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
53 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 = file....
4
votes
2answers
441 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
484 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 ...
1
vote
1answer
514 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
162 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
2k 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
1k 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
104 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
965 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
371 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 ...