Java中的HDF5：可用API之间有什么区别？ [英] HDF5 in Java: What are the difference between the availabe APIs?
问题描述
我刚刚发现了HDF5格式，我正在考虑使用它来存储分布在Java应用服务器集群上的3D数据。我发现Java有几种可用的实现，并且想知道它们之间的区别：
I've just discovered the HDF5 format and I'm considering using it to store 3D data spread over a cluster of Java application servers. I have found out that there are several implementations available for Java, and would like to know the differences between them:
-
Java HD5接口（JHI5）来自HDF组的Java包装器本身。
Java HD5 Interface (JHI5) The Java wrapper from the HDF group itself.
Nujan：纯Java NetCDF4和HDF5编写器（无法读取HDF5）
Nujan: Pure Java NetCDF4 and HDF5 writer (cannot read HDF5)
最重要的是，我想知道：
Most importantly, I would like to know:
-
涵盖了多少本机API，没有任何限制原生API中是否存在
？
How much of the native API is covered, any limitations that do not exist in the native API?
如果支持Parallel HDF5？
If there is support for "Parallel HDF5"?
ONC加载我的3D数据，每次访问3D数组中的一个元素时，是否会获得本地调用开销
？也就是说，数据
实际上变成了Java对象，还是保留在native / JNI
内存中？
Once my 3D data is loaded, do I get a "native call overhead" each time I access one element in a 3D array? That is, do the data actually gets turned into Java objects, or stay in "native/JNI memory"?
是有任何特定的
实现的稳定性问题，因为本机代码崩溃通常会使整个
JVM失效？
Is there any know stability problems with a particular implementation, since a crash in native code normally takes the whole JVM down?
推荐答案
HDF Java遵循分层方法：
HDF Java follows a layered approach:
-
JHI5 - 低级JNI包装器：非常灵活，但使用起来也相当繁琐。
JHI5 - the low level JNI wrappers: very flexible, but also quite tedious to use.
Java HDF对象包 - 一个高基于JHI5的级别接口。
Java HDF object package - a high-level interface based on JHI5.
HDFView - 基于Java HDF对象包的基于Java的查看器应用程序。
HDFView - a Java-based viewer application based on the Java HDF object package.
JHDF5在JHI5层上提供了一个高级接口，它提供了HDF5到Java的大部分功能。 API具有浅薄的学习曲线，并隐藏了开发人员的大部分内务工作。您可以在作为JHDF5一部分的JHI5接口上运行Java HDF对象包（和HDFView），因此这两个API可以在一个Java程序中共存。
JHDF5 provides a high-level interface building on the JHI5 layer which provides most of the functionality of HDF5 to Java. The API has a shallow learning curve and hides most of the house-keeping work from the developer. You can run the Java HDF object package (and HDFView) on the JHI5 interface that is part of JHDF5, so the two APIs can co-exist within one Java program.
Permafrost和Nujan在这一点上似乎还远未完成，而且Permafrost最近没有看到很多活动，因此它们似乎不是目前的首选。
Permafrost and Nujan seem far from being complete at this point and Permafrost hasn't seen a lot of activity recently, so they appear to be not the first choice at this point in time.
我认为一个好的途径是查看Java HDF5对象包和JHDF5，确定哪两个API更适合您的需求并与之相配。
I think a good path for you is to have a look at both the Java HDF5 object package and JHDF5, decide which one of the two APIs fit your needs better and go with that one.
免责声明：我曾经使用过JHDF5接口，所以我可能有偏见。
Disclaimer: I have worked on the JHDF5 interface, so I may be biased.
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