Pre-loading method and device based on embedded real-time java virtual machine

A technology of java virtual machine and java class, which is applied in the field of class loading, can solve problems such as not being able to meet real-time requirements, not being able to carry class loaders and core library classes, and not being able to apply class loading methods, so as to avoid uncertainty Effect

Active Publication Date: 2015-09-16
PEKING UNIV
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Problems solved by technology

But the existing class loading method, on the one hand, because other classes need to be loaded in the program execution process except the basic class, resulting in the uncertainty of the loading time, can not meet the real-time requirements; on the other hand, the class The resources of the loader and core library classes are extremely large, and the resources of the embedded system are limited, which cannot carry the existing class loader and core library classes.
Therefore, in the prior art, the class loading method cannot be applied to a real-time embedded computing environment

Method used

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  • Pre-loading method and device based on embedded real-time java virtual machine
  • Pre-loading method and device based on embedded real-time java virtual machine

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Embodiment Construction

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0019] figure 1 The present invention is based on the pre-class loading method of the embedded real-time Java virtual machine. Such as figure 1 As shown, the pre-loading method includes the following steps:

[0020] Step S100, modifying the java class file of the class loader, and setting a loading method for class loading according to the class list.

[0021] Step S200, modifying the jni class of the virtual machine kernel, setting a pre-loading method for calling the loading method to pre-load all classes required by the application;

[0022] Step S300, obtaining a class list including all classes required by the application;

[0023] Step S400, according to the class preloading method, preload all the classes required by the ...

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Abstract

A class preloading method and device based on the embedded real time Java virtual machine are provided. The method comprises: modifying the java class file of a class loader and setting a loading method for loading classes according to a class list (S100); modifying the jni class of the virtual machine core and setting the class preloading method for invoking the loading method to preload all the classes required for an application program (S200); acquiring the class list which comprises all the classes required for the application program (S300); and according to the class preloading method, preloading all the classes required for the application program on the basis of the class list (S400). The provided class preloading method and device based on embedded real time Java virtual machine can avoid the disadvantages of time jitter and limitedness of the embedded system resources, and realize the class preloading in the embedded Java virtual machine.

Description

technical field [0001] The invention relates to class loading technology, in particular to a pre-class loading method and device based on an embedded real-time Java virtual machine. Background technique [0002] The Java platform has already had a large base of developers so far, and its application fields have expanded from the initial server and desktop fields to real-time and embedded fields. However, different from the traditional computing environment, embedded real-time computing is a kind of computing with limited computing resources, and at the same time requires a high degree of certainty in the operation of virtual machines. [0003] Currently, there are two mechanisms for class loading: pre-loading and on-demand loading. In order to optimize the system and improve the execution speed of the program, the Java runtime environment will load all the basic classes required for Java runtime into the memory at the beginning of the JRE (Java Runtime Environment, Java run...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F9/445
CPCG06F9/44521
Inventor 曹东刚荀娜梅宏
Owner PEKING UNIV
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