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

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...

AI Technical Summary

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

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