创建一个对读操作线程安全的DOM [英] Creating a DOM that is thread safe for read operations

问题描述

我的应用程序组成了一个来自多个xml源的网页模型。使用普通的Xerces解析器将这些源解析为内存为DOM对象。不幸的是，对于只读操作，Xerces DOM对象不线程安全。我希望能够重用已解析的DOM进行读取。有没有人知道我使用的读取DOM实现的另一个解析器或简单线程安全？

My application composes a webpage model from a number of xml sources. These sources are being parsed into memory as DOM objects with the normal Xerces parser. Unfortunately, Xerces DOM objects are not thread safe for read-only operations. I would like to be able to reuse the parsed DOM for read. Does anyone know of another parser or a simple thread safe for read DOM implementation that I use?

推荐答案

Saxon为其提供DOM包装器内部和不可变数据结构。

Saxon provides DOM wrappers to its internal and immutable data structure.

// create Saxon IdentityTransformer
final Transformer transformer = new TransformerFactoryImpl().newTransformer();

// set up holder for the output
final TinyBuilder outputTarget = new TinyBuilder(
    new PipelineConfiguration(new Configuration()));

// transform into Saxon's immutable TinyTree
transformer.transform(xml, outputTarget);

// extract the whole XML as TinyNode 
final TinyNodeImpl tinyNode = outputTarget.getTree().getNode(0);

// wrap TinyNode as DOM
final NodeOverNodeInfo nodeOverNodeInfo = DocumentOverNodeInfo.wrap(tinyNode);

// cast to DOM
final Document doc = (Document) nodeOverNodeInfo;

（用saxon-he 9.5.1测试）

(tested with saxon-he 9.5.1)

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