| Middleware technologies has achieved great development in recent years,not only becomeindustry's preferred choice to develop distributed system,but also attracted a large number ofacademics.With the popularization of application ,as well as the rapid development ofInternet,Middleware technology is characterized by three trends:Firstly,middleware pentrates tothe traditional run layer,provide more powerful run support.Secondly,middleware provide moreand more mechanisms for applications.Finally,middleware also began to consider providedevelopment support for high-level design and application deployment.Paper focuses on the key technologies of mobile terminal middleware platform core layer,amemory request management in advance combined with dynamic memory allocation andrecovery algorithm is proposed, it reduces time-consuming and improves the memoryutilization effectively, and it meets the requirement of reliability,real-time and efficiency tomemory management for embedded real-time operating system. A resource download modelbased on cloud calculation is proposed,optimize the download process of HDFS on Hadoopplatform,download strategy is designed according to its workflow features.Using multi-threadeddownload strategy,the file downloaded speed is significantly improved comparing with the wayof HDFS. Through depth research of dynamic loading principles of Java,Windows dll andLinux,more advanced method of dynamic loading system is proposed.Comparing with thetraditional dynamic loading method,it has obvious advantages in speed. Download and loadprocess of target module is realized using C language under Nucleus OS on existing embeddedhardware platform,by which program debug is finished.To sum up,this theis rounds dynamic memory management of embedded operatingsystem,implementaion of download object module and module dynamicly loadingmechanism,and the corresponding algorithm or solution is proposed,which were validated onhardware platform. |
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