When searching for Memory Map do not include words such as serial, number, key, license, code, torrent, etc. Excluding words such as these will result in much more accurate results. Recheck your spelling for Memory Map just in case, you might also want to try searching without the version number. If you still are having trouble finding Memory Map have a look at the high speed results above. Memory-Map navigation software is easy to use on a PC or Pocket PC. It helps you plan your routes and print maps or charts. With a GPS connected it will show your position on a full colour detailed map and help you navigate your way. I tried Memory Map, but they said they couldn't/wouldn't swap licensing from one person to another, so in effect, secondhand Memory Map software is useless, so don't be tempted to buy it on ebay. I bought a used GPS and got some MM software with it, so contacted MM to transfer to myself, but no joy. They wouldn't issue a license key for it.

1. Memory Map Licence Key Generator

Do any of you know of a Java Map or similar standard data store that automatically purges entries after a given timeout? This means aging, where the old expired entries “age-out” automatically.

Preferably in an open source library that is accessible via Maven?

I know of ways to implement the functionality myself and have done it several times in the past, so I'm not asking for advice in that respect, but for pointers to a good reference implementation.

WeakReference based solutions like WeakHashMap are not an option, because my keys are likely to be non-interned strings and I want a configurable timeout that's not dependent on the garbage collector.

Ehcache is also an option I wouldn't like to rely on because it needs external configuration files. I am looking for a code-only solution.

Basil BourqueSean Patrick FloydSean Patrick Floyd

closed as off-topic by Sotirios Delimanolis, Martin James, Makyen, Paul Roub, SteveOct 5 '17 at 20:49

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10 Answers

Yes. Google Collections, or Guava as it is named now has something called MapMaker which can do exactly that.

Update:

As of guava 10.0 (released September 28, 2011) many of these MapMaker methods have been deprecated in favour of the new CacheBuilder:

Shervin AsgariShervin Asgari

This is a sample implementation that i did for the same requirement and concurrency works well. Might be useful for someone.

Git Repo Link (With Listener Implementation)

Cheers!!

VivekVivek

You can try out my implementation of a self-expiring hash map. This implementation does not make use of threads to remove expired entries, instead it uses DelayQueue that is cleaned up at every operation automatically.

Apache Commons has decorator for Map to expire entries: PassiveExpiringMapIt's more simple than caches from Guava.

P.S. be careful, it's not synchronized.

Google collections (guava) has the MapMaker in which you can set time limit(for expiration) and you can use soft or weak reference as you choose using a factory method to create instances of your choice.

EmilEmil

Sounds like ehcache is overkill for what you want, however note that it does not need external configuration files.

It is generally a good idea to move configuration into a declarative configuration files ( so you don't need to recompile when a new installation requires a different expiry time ), but it is not at all required, you can still configure it programmatically. http://www.ehcache.org/documentation/user-guide/configuration

dan carterdan carter

you can try Expiring Map http://www.java2s.com/Code/Java/Collections-Data-Structure/ExpiringMap.htma class from The Apache MINA Project

Memory Map Licence Key Generator

If anybody needs a simple thing, following is a simple key-expiring set. It might be converted to a map easily.

palindrompalindrom

Guava cache is easy to implementation.We can expires key on time base using guava cache. I have read fully post and below gives key of my study.

Reference : guava cache example

StanislavAnuj DhimanAnuj Dhiman

Typically, a cache should keep objects around some time and shall expose of them some time later. What is a good time to hold an object depends on the use case. I wanted this thing to be simple, no threads or schedulers. This approach works for me. Unlike SoftReferences, objects are guaranteed to be available some minimum amount of time. However, the do not stay around in memory until the sun turns into a red giant.

As useage example think of a slowly responding system that shall be able to check if a request has been done quite recently, and in that case not to perform the requested action twice, even if a hectic user hits the button several times. But, if the same action is requested some time later, it shall be performed again.

Matthias RongeMatthias Ronge

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