The synchronization tag has no wiki summary.
0
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0answers
28 views
How to replicate state update to all the nodes in middle-ware cluster?
I am developing a middle-ware components that receives a stream of self-contained events. If event corresponds to a business rule a notification is generated. A system outgrew vertical scaling and it ...
1
vote
1answer
164 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
229 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
57 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 ...
1
vote
0answers
508 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
160 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
90 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
142 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 ...
2
votes
2answers
232 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
219 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
5answers
812 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 ...
1
vote
4answers
352 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
770 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
252 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
382 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 ...
17
votes
3answers
1k 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
267 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 ...
13
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8answers
8k 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
348 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?
5
votes
3answers
3k 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 ...
10
votes
2answers
2k 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
517 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 ...
3
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
305 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 ...
5
votes
1answer
1k views
Atomic Memcache Operations in PHP
This post is a follow up to this question: http://stackoverflow.com/questions/10626904/php-atomic-memcache/10627226
Considering I am using Memcache (no d at the end) on PHP 5.3.10, I implemented a ...
0
votes
1answer
163 views
Synchronize Azure SQL (cloud) with Azure SQL Emulator (local)?
We have an Azure service (web role) that heavily depends on the database. For offline development/testing, we'd like to have the app+db run offline within the emulators. Running the webrole itself ...
14
votes
2answers
5k views
Best practice/Patterns for two way data synchronisation
Quite often in my work the idea of 2-way data synchronisation between database systems crops up. The classic example is two slightly different CRM systems (say, Raiser's Edge and Salesforce) and the ...
2
votes
1answer
290 views
How to achieve thread synchronizing without effecting the efficiency in java [closed]
Say using following function:
public synchronized int getUnique(){
MyObject obj = getValueFromDb();
obj.modifyIt();
obj.commit();
}
When simultaneous call is made to this method several ...
8
votes
1answer
571 views
HTML5 video sprites
I'm currently working on a project where there is a requirement to dynamically composite multiple synchronised video sources onto a single canvas. The initial prototype I put together loaded the video ...
5
votes
2answers
921 views
How to sync calendars events programmatically?
I'd like to hear some ideas how to sync calendar events. Say I have two calendars having fields (id, title, start, end, updated, location and description). I'm struggling with starting point. Its easy ...
2
votes
3answers
219 views
Offline data that will need imported later
My existing application is a .NET 3.0 winform app that talks to a WCF service which in turn updates a MS SQL Server database; I can make changes at all spots (Windows client, WCF, server). I've had an ...
3
votes
4answers
2k views
How would you approach developing a Hotel Reservation System?
Till now, I have had the experience of developing either a desktop application or a Website. But, with this Hotel reservation system, I am interfacing a problem that needs both.
The application ...
3
votes
3answers
196 views
How to improve enterprise level application that consists of only static methods
I am new in a enterprise level application project and discovered that 99% of everything I've seen in code is static methods, static properties.
The application at hand is a distributed app ...
4
votes
2answers
594 views
Ideas for Offline & Sync Across Multiple Platforms [closed]
I'm looking for some implementation ideas to be able to have offline apps sync data to a central server. The server will be Sql Server 2008. The clients will download data from the server when ...
1
vote
6answers
658 views
why no hasLock/testLock on mutexes
looking through the docs of posix' pthread_mutex_t and window's mutex and CRITICAL_SECTION I noticed there is no easy way of checking whether the current thread holds a specific mutex
posix' ...
3
votes
1answer
695 views
synchronization web service methodologies or papers
I am building a web service (PHP+JSON) to sync with my iphone app. The main goals are:
Backup
Provide a web view for printing / sorting, manipulating.
allow a group sync up and down.
I am aware of ...
11
votes
1answer
3k views
Redis vs Zookeeper
It seems silly to compare these two servers considering that they're meant for very different things. But if you think about it, they can do lots of similar things: store configuration data, ...
1
vote
2answers
122 views
Path of Replication
I'm currently developing a replication system to keep data in-synch between an arbitrary number of servers.
Some of these servers exist in one cluster on one LAN. Others exist somewhere else in the ...
4
votes
3answers
631 views
How to do data synchronisation between two applications?
Our client has a CRM application (let's call it A) and a custom built Windows application (VB.NET) (let's call it B) that directly writes to and reads from the CRM database.
Application A is used ...
1
vote
2answers
574 views
Multithreaded UI desktop application issues
I am involved into development a rich UI project: desktop windows application. Application uses asynchronous invocations and in its turn it should be ready to process external messages (events). The ...
