Use PermGen space or roll-my-own intern method?
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by Adamski
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Published on 2010-05-19T11:29:21Z
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2010/05/19
11:40 UTC
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I am writing a Codec to process messages sent over TCP using a bespoke wire protocol. During the decode process I create a number of String
s, BigDecimal
s and dates. The client-server access patterns mean that it is common for the client to issue a request and then decode thousands of response messages, which results in a large number of duplicate String
s, BigDecimal
s, etc.
Therefore I have created an InternPool<T>
class allowing me to intern each class of object. Internally, the pool uses a WeakHashMap<T, WeakReferemce<T>>
. For example:
InternPool<BigDecimal> pool = new InternPool<BigDecimal>();
...
// Read BigDecimal from in buffer and then intern.
BigDecimal quantity = pool.intern(readBigDecimal(in));
My question: I am using InternPool
for BigDecimal
but should I consider also using it for String
instead of String
's intern()
method, which I believe uses PermGen space? What is the advantage of using PermGen space?
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