Java card system rubbish recovering method

A recycling method and garbage technology, applied in the field of smart cards, can solve the problems that ordinary SIM cards do not have application downloads, system garbage occupies storage space, and restricts business development.

Active Publication Date: 2008-08-20
EASTCOMPEACE TECH
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AI Technical Summary

Problems solved by technology

[0003] With the arrival of the third generation mobile communication system (referred to as 3G), 3G operators will take advantage of the bandwidth advantages of 3G networks to provide customers with new services such as music downloads, video services, and wireless broadband access. It has the function of downloading application program (Applet), so it limits the business development of mobile operators and value-added service providers, and the emergence of emerging Java card technology solves this problem
Java card technology is a new

Method used

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Embodiment Construction

[0017] In order to clearly describe the Java Card system garbage collection method of the present invention, the hardware structure of the trace collector is introduced at first.

[0018] The Java card involved in the present invention includes a trace collector, which completes two processes of object traversal and object clearing. In the object traversal phase, the trace collector scans from the root set and recursively determines reachable objects along each link on the entire object graph. Reachable objects encountered during the trace process use an independent bitmap to set a flag that if an object is not reachable from one (at least one) of these root objects, it is garbage collected. The principle and process of object traversal will be described in detail below.

[0019] The Java stack is used in the above object traversal process, see figure 1 discloses a space management method of the Java stack involved in the present invention: the bottom layer of the Java stack...

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Abstract

The invention relates to Java card system rubbish recovery method comprising the following steps: 1) invoking rubbish reclamation realization function by Java card system,2) initializing the rubbish reclamation realization function in place mat zone, 3) traversing and marking objects in the bitmap by the trace gatherer, 4) clearing the objects corresponded by initialized value's bite in bitmap zone. The Java card system rubbish recovery method efficiently cleans up the space occupied by the Java card system (that is the objects which can not arrive in objects ergodic process) to make more reasonably utilize the limit memory space and to provide more sufficient space for download of application programs.

Description

technical field [0001] The invention relates to the field of smart cards, in particular to a Java card system garbage collection method. Background technique [0002] Smart cards have been widely used in various products such as mobile phones, music players, and digital TVs. Smart cards can realize various functions such as identification, data storage, and information processing. Take the SIM card (Subscriber Identity Model, customer identification module) widely used in mobile phones as an example, the SIM card is a kind of smart card with user identification function and data storage and processing function, it is a mobile operator, value-added service provider and The medium between users is widely used in the field of mobile communication. [0003] With the arrival of the third generation mobile communication system (referred to as 3G), 3G operators will take advantage of the bandwidth advantages of 3G networks to provide customers with new services such as music downl...

Claims

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Application Information

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IPC IPC(8): G06F9/50G06F12/00G06K19/07H04Q7/32
Inventor 王礼宇余世锐
Owner EASTCOMPEACE TECH
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