Evaluation of Partial File Modification for Java-Based Realtime Communication Systems

Tetsuyasu YAMADA
Hiroshi SUNAGA
Shinji TANAKA
Satoshi SHIRAISHI
Keiichi KOYANAGI

Publication
IEICE TRANSACTIONS on Communications   Vol.E88-B    No.10    pp.3982-3991
Publication Date: 2005/10/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.10.3982
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Switching for Communications
Keyword: 
non-stop technology,  on-line file modification,  plug-in,  switching program,  

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Summary: 
This paper proposes a Java online plug-in mechanism that can be used to modify any part in a system file coded in Java, even while the part is running, without service interruption. The Java-related plug-in capabilities are devised by using the plug-in functional elements offered by the existing C++ online plug-in that we proposed. In particular, measures on how to deal with the use of Just In Time compilation and inline expansion are considered. New linkage and file-back up techniques are proposed for this purpose. Case studies reveal its wide applicability and the degree of memory area saving effects. Evaluation proves this mechanism does not affect the performance of ordinary service processing. It is expected to be used in practice for Java-based service processing such as VoIP and Instant Messaging.