问题描述
我有一个Web应用程序，用户可以在其中向Lucene索引提交查询.查询由Lucene解析 QueryParser .我了解到QueryParser不是线程安全的困难方法.
I have a web application where users submit queries to a Lucene index. The queriesare parsed by a LuceneQueryParser. I learned the hard way that QueryParser is not thread-safe.
使用单个QueryParser实例并同步对其parse()方法的调用是否更好?还是为每个查询构造一个新实例更好? (或者我可以最好用QueryParser s池?)
Is it better to use a single QueryParser instance, and synchronize on calls to its parse() method? Or is it better to construct a new instance for each query? (Or would I be better served by a pool of QueryParsers?)
我知道，通常这样的问题取决于具体情况，需要进行概要分析，但是也许有人可以肯定地说"QueryParser非常便宜/构造昂贵"?
I know that in general questions like this depend on the particulars and require profiling, but maybe someone out there can say definitively "QueryParsers are extremely inexpensive/expensive to construct"?
推荐答案
每次创建一个新的.这些是轻量级的对象，JVM很好地处理了对象的创建和垃圾回收.绝对不要使用对象池.
Create a new one each time. These are lightweight objects and the JVM handles object creation and garbage collection very well. Definitely do not use an object pool.
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