Implementing a Write-Back Cache in Java

Question

I trying to implement a write-back cache. I'm trying to use soft referenes, but I'm having troubles performing the post-mortum write-back because the reference is cleared before it's added to the gcQueue and thus I don't have access to the referent object.

Solutions?

Community · Accepted Answer · 2017-05-23 12:04:11Z

2

You can try Guava's Mapmaker.

Example:

final ConcurrentMap<Long, Integer> cache = new MapMaker()
        .softValues().expiration(20,TimeUnit.MINUTES)
        .makeComputingMap(new Function<Long, Integer>() {
              @Override
            public Integer apply(Long arg0) {
                return null;
            }
            });

SO Questions on MapMaker :

Alternative option :

Use Supplier class's memoizeWithExpiration which is also part of guava library.

edited May 23, 2017 at 12:04

CommunityBot

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answered Nov 9, 2010 at 10:31

Emil

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1 Comment

maaartinus Over a year ago

I really can't see how it helps with the write-back.

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