A cache is a component that transparently stores data so that future requests for that data can be served faster.
4
votes
3answers
84 views
Map with different types for values
I am trying to implements a map (that can work as a cache) that has strings as keys and values of different types. In my real case once set the key/values in the map will not change.
I used these ...
3
votes
2answers
48 views
Correct way of implementing thread safe factory with caching?
I have a ConnectorFactory that creates Connector objects based on parameters like URLs, username and passwords.
The ...
1
vote
1answer
64 views
2
votes
1answer
47 views
Clear cache files older than 30 minutes
This is what I came up with to delete files not modified within the last 30 minutes from a subdirectory named cache.
...
10
votes
4answers
292 views
Ugly optimized caching of SimpleDateFormat
Concerning the optimization of this simple function
String formatDate(String format, Locale locale, Date date) {...}
formatting a ...
2
votes
0answers
70 views
Rails app that scrapes forum using Nokogiri gem
I've built a website that scrapes a guitar forum's pages and populates Rails model. I'm using rake task along with heroku scheduler to run background scrapes every hour.
On the homepage, the forum ads ...
3
votes
2answers
120 views
Thread-safe, in-memory LRU cache with a maximum item count of 10
I'm attempting to master LRU Caching. It must be thread safe, and it should preferably perform as well as web image-cache, (avg ~1MB).
Please take a look to see if there's anything wrong, amiss, ...
2
votes
2answers
72 views
Database mirroring cache
I generally prefer to work with EF by specifying exactly the data to fetch from the DB with regards to Navigation Properties/Lookups and the like, so we wrote this cache system to limit the number of ...
3
votes
1answer
72 views
Using EHCache the right way
I use EHCache to maintain a mostly read-only cache of results from database queries. It works perfectly for over a dozen queries.
However, there is one table which needs an odd access method that is ...
4
votes
2answers
145 views
4
votes
1answer
60 views
Python caching generator
Is this the correct way to cache a generator in Python, without iterating over it right away (for example using list() over it)?
...
3
votes
2answers
67 views
azure cache getoradd (without locking)
Inspired by the non-locking implementation proposed in this thread:
Locking during cache population , the following code is an attempt to (about) do the same using the azure cache. As I'm totally ...
12
votes
4answers
231 views
I'm not sure if I still love Fibonacci, but my code is getting better. How much better?
Technically, this is a follow up to these two questions, but I have taken a radically different approach.
Everybody Loves Fibonacci
Does everyone still love Fibonacci
I finally allowed myself to ...
1
vote
0answers
152 views
HttpRuntime.Cache cache manager class
I am making code review of legacy class, which manages caching logic. Caching logic uses ASP.NET webforms HttpRuntime.Cache.
I know class, that is posted below, is ...
4
votes
2answers
334 views
Creating a cache manager
I am purely new to C++ memory management. Am I on the right path, or should I employ a different design strategy or a different memory manager policy (such as ...
2
votes
1answer
86 views
1
vote
1answer
63 views
Using Redis to store word occurences
I am doing a project where I am analyzing a group of Tweets.
What I need to do is find the occurrence of each individual word. I am fairly new to Redis, so I am not quite sure that my solution is ...
4
votes
1answer
138 views
Using the Rotten Tomatoes API
This is a Python module I made to search the Rotten Tomatoes movie API. It caches the search results in a SQLite database.
What improvements can I make to the cache system? Is there a better way ...
4
votes
2answers
203 views
ASP.NET MVC architecture questions
I haven't done much .NET development in several years. Now I'm enjoying some of the new stuff with modern .NET. I just want to make sure I'm using things correctly. I'm a solo developer with no one ...
2
votes
1answer
1k views
Generic, thread-safe MemoryCache manager for C#
Using this question as a base, and using some of the advice in the answers, I wanted to build out something that would be generic, thread-safe, and easy to use for at least one current and several ...
2
votes
2answers
64 views
JavaScript bookmarklet with a 24 hour cache
I'm working on a bookmarklet that will be cached for 24 hours only, after that time it will be reloaded from the original source.
Is there something I could improve?
...
5
votes
1answer
143 views
HTTPCache and MemoryCache cross dependency
After asking a question on StackOverflow about the two .NET caching systems taking dependencies on each other I gave implementing them a go. I posted them as my own answer there but before accepting ...
15
votes
7answers
2k views
Why does caching of string objects perform faster?
I'm trying to implement String-Pool. I'm maintaining a HashMap<String,String> to store the keys.
...
2
votes
1answer
76 views
LRU Cache with a static variable for garbage value
I have tried to implement a Least Recently Used cache with only C++ STL containers. The main thing that I keep asking my self the static variable called ...
10
votes
1answer
189 views
Allowing user space file-system to (kind-of) keep more than maximum number of files open
The linked code below is meant to be used in a user space file-system (fuse). Given that multiple processes may have multiple files opened on the file-system, the files on the specific user space ...
3
votes
2answers
673 views
Generic MemoryCache class
I want to have a caching class to cache different types. I want each type to be cached in a different MemoryCache but in a generic way.
Am I doing it right?
...
1
vote
1answer
210 views
Performance issue of LFU-like web caching replacement algorithm
I have implemented a simulation program that runs LRU and another web caching algorithm called Sliding Window LFU. I want to compare them both in terms of the hit rate and their run time. SW-LFU works ...
1
vote
1answer
26 views
Loading Recent Posts In Session? [closed]
I have a PHP code structure where I cash some pages in sessions.
Example:
I have a page which shows last 10 user posts, what I do is to load 10 posts and store then in session:
Page Class:
...
3
votes
2answers
317 views
In-memory cache implementation revisited
As a follow-up on my earlier question, here is the new implementation. The major change is now that the base class just deals in ICacheValue values which are ...
3
votes
1answer
103 views
htaccess for URL remapping, caching, and compression
I have been collecting snippets from all over the place and then put them all together creating the following .htaccess file.
I really don't understand if what I have done below is good/should work ...
1
vote
0answers
66 views
Adding viewstate based property and implication in future converstion to MVC in ASP.NET forms project
Supposedly adding another viewstate based property in user control (riddled with similar properties) incur technical debt in future effort to convert projects to MVC (comment made by one of my ...
8
votes
1answer
257 views
Cache wrapper - Generics vs Dynamic
I've implemented a common wrapper pattern I've seen for the .NET cache class using generics as follows:
...
5
votes
3answers
124 views
Class with a temporary buffer: Tradeoff between memory usage and execution speed [closed]
Consider the following two classes
class foo{
// huge data structure - 400-500 bytes per instance
};
class Bar{
void get_foo(int n, foo& f);
}
In my ...
7
votes
1answer
3k views
In-memory cache implementation
A few years ago I required a lightweight in-app-in-memory cache. Requirements:
Time complexity O(1) for individual element read/write access
Space complexity ...
5
votes
1answer
289 views
Function to delete oldest items out of HTML5 localStorage. Can I make it more efficient?
In a current javascript project, I'm working with the browsers localStorage, and it will pretty consistently be full. To overcome this, I wrote a wrapper to surround the localStorage object that would ...
5
votes
1answer
103 views
Optimize text to ascii lookup map and scalability
Is there a more optimal way of retrieving the character for the letter? I would assume that I would just replace my Entry set loop with another map, but I do not want to bloat the code, because it ...
4
votes
1answer
130 views
Caching a function view for a day
I am writing a flask app that I will deploy it on Heroku to test it. There is a page that will generate daily photos and information based on a JSON file. The view is valid for 24 hours beginning from ...
5
votes
1answer
236 views
In-memory data cache architecture for data transfer
I am writing a cron job to manipulate and transfer remote data.
I need to cache data from a table, process it, merge with previous table, iterate the process, and eventually send the result data to ...
3
votes
1answer
122 views
How to improve this session cache to search faster
I have this code which will store user session credentials:
...
5
votes
1answer
1k views
A Simple Cache class
“There are only two hard things in Computer Science: cache
invalidation and naming things.” -- Phil Karlton
That being said, I created this SimpleCache class which I intend to use to cache ...
1
vote
0answers
120 views
In-memory data cache architecture
I am designing a basic in-memory cache storage with a thin CRUD (actually CRD) interface. The design is inspired by backend solutions such as Parse and StackMob.
Main characteristics:
Cache ...
5
votes
1answer
304 views
Generic pure functions memoization
I like to create tools for memoization since it can sometimes be useful. I recently created a generic tool for memoizing pure functions results.
Here is an example of how it works:
...
6
votes
1answer
113 views
Optimize RecursionArray interface
I created a class a while ago that I named a "Recursion Array". It is a way to create dynamically memoized sequences such as the Fibonacci sequence or the factorial numbers sequences. The concept is ...
1
vote
0answers
157 views
Improve the architecture to cache data
I cache the data and use local database in my Windows Phone app. Algorithm is very simple:
Get data from DB and show in UI
Get data from a web service and show in UI
Update data in DB from the web ...
2
votes
1answer
3k views
Design LRU cache interview questions
Code reviewers, I request you review the code and suggest all tips for improvement.
...
4
votes
1answer
805 views
Locking during cache population
Here I want to lock when populating a particular cache object, without blocking other calls to the same method requesting Foos for other ...
1
vote
0answers
167 views
Combine and minimize all .js files in parent folder
I'd appreciate some feedback on my latest PHP script. It is supposed to work like this:
When obtained, it checks whether the cache is still up-to-date
IF YES, return the cache; IF NOT, reset the ...
3
votes
2answers
161 views
Perl script for generating iTunes xml Metadata for MP3 CDs/DVDs
Many years ago, I wrote a script in Perl that was meant to create a cached metadata of MP3 files (in Apple's plist/XML format) which iTunes uses when you insert a CD/DVD full of MP3 files (the same ...
1
vote
0answers
124 views
Memcached caching
I wanted to create a class to cache dynamic PHP output (or a portion of it from one page) using Memcached key/value story. Basically it checks to see if the file has been cached already, if it has, it ...
1
vote
1answer
114 views
Cache mechanism with duration
I want to implement in my code a cache mechanism with a fixed duration. For example an iframe will be cached for one hour, or a script file will be cached for 24 hours.
This is how I implemented it, ...
