A cache is a component that transparently stores data so that future requests for that data can be served faster.

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2
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1answer
59 views

Simple thread-safe loading cache based on RxJava

I'm sketching a simple thread-safe cache which can load missing values. It is based on RxJava's Observable which also means that it should be possible for a client to join a request for value which is ...
4
votes
3answers
71 views

Thread safe cache for write through and writeback

This cache is like a list where new elements are inserted in the middle, cache hits are put to head of the list and replaced elements are taken from the end. Would I just use a list the lookup would ...
3
votes
1answer
82 views

Redis Cache Data source code - Retrieve/Set/Invalidate actions

This is my RedisDataSource code. What I am mainly interested in is how the retry policy could be improved and if using WindowsAzure Trainsient Fault Handling this case (using Redis Azure Cache) makes ...
1
vote
1answer
52 views

Caching DOM-queries

I've been optimizing my code and I always tend to cache common selectors like this (jQ): ...
3
votes
1answer
55 views

Reducing lock contention for a caching utility, or make it totally lockless but threadsafe

My Java program is a module called configProxy which fetches configuration entries from a remote node (say from a Redis instance). When the caller calls the ...
9
votes
2answers
92 views

Inspector Rubberduck - Take Two

Release 1.1 of Rubberduck only had a handful of implemented code inspections, more as a proof of concept than anything else. For release 1.2, we now have 19 implementations of our ...
6
votes
1answer
106 views

Cache for JSON API

I am working on a small project which utilizes a 3rd party API. Many of the queries from the API can take 5-10 seconds so to keep the front end moving a bit faster I decided to cache the responses ...
5
votes
1answer
88 views

Caching data on disk in iOS

I've got an app that's got an activity/timeline like view. Since I don't want to retrieve the entire timeline every time, I'm caching all the events. Currently, this is how I go about it: ...
6
votes
2answers
129 views

Choosing a random flat color

I have a big array of custom flat colors with perhaps 100 lines: ...
2
votes
1answer
52 views

LRU Cache Design using LinkedHashMap

This is a follow-on qestion from: LRU cache design Revised Implementation ...
3
votes
1answer
65 views

Concurrent LRU cache using sychronizedMap() or ReadWriteLock

Trying to implement a simple, thread-safe LRU cache that's meant for "read mostly" use. Collections.sychronizedMap() Clean, simple, not much else to say. ...
6
votes
1answer
321 views

LRU cache design

Idea The cache is nothing but a circular arrayList. This list contains Entry<K,V>. Whenever new entries are coming, add ...
3
votes
0answers
65 views

Caching in PHP using the filesystem

I wrote a simple class to cache data on a filesystem. The class also provides an internal cache using a static variable to avoid reading from disk for each request. ...
0
votes
1answer
67 views

A double mapped cache with WeakReferences for second key type

I needed a way to cache a large number of objects with two different types of keys. In my case: A String key represents my object in a serialized form. This way ...
2
votes
1answer
245 views

Local image cache for external images

I have written a simple image cache script, the purpose is to load the image locally, so i can control the cache times of the images, and i have better load times than the host server, (battle.net ...
5
votes
2answers
180 views

Time Sensitive ConcurrentDictionary

In our application, we have many function calls that we want to cache the results of. However, the result of these functions depends on database calls, so we want this cache to refresh every so often ...
5
votes
3answers
372 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
150 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
165 views

Memory cache service

I am repeating this code at lot of places: ...
2
votes
1answer
89 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
358 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
136 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
421 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
114 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
620 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
932 views

Simple LRU cache with an expiration time

How can I improve the performance of the code below? ...
4
votes
1answer
100 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
91 views

Azure cache getoradd (without locking)

Inspired by the non-locking implementation proposed in this post, the following code is an attempt to (about) do the same using the azure cache. As I'm totally green on the Azure cache I'd appreciate ...
12
votes
4answers
258 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
262 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
482 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
141 views

Is my ObjectCache wrapper sound?

Wrapper: ...
1
vote
1answer
69 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
217 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
288 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 ...
3
votes
1answer
4k 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
69 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
318 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
87 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
204 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
1k 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
272 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
30 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: ...
4
votes
2answers
600 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
131 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
98 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
454 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
129 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 ...
9
votes
1answer
5k 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 ...