軟件體系結(jié)構(gòu)信息共享體系結(jié)構(gòu)sharedinformation(已修改)
2024-10-14 09:31 本頁面
【正文】 軟件體系結(jié)構(gòu) 信息共享體系結(jié)構(gòu) Shared Information 孫志崗 169。 2 2020/11/4 Where are we? 169。 3 2020/11/4 Families of Architectural Styles 169。 4 2020/11/4 Families of Architectural Styles 169。 5 2020/11/4 Families of Architectural Styles 169。 6 2020/11/4 Families of Architectural Styles 169。 7 2020/11/4 Shared Information Systems ? Style represents a large variety of systems 這種風(fēng)格描繪很多種系統(tǒng) ? many variants depending on nature of shared data 共同特點是共享數(shù)據(jù) ? Style addresses mechanisms for: 風(fēng)格說明其運行機制是 ? collecting, manipulating and preserving large bodies of data 收集、操作、保存大量的數(shù)據(jù) ? Databases are a natural example, but not the only one 數(shù)據(jù)庫是一個典型的例子，但不是僅有的例子 ? we?ll see others in this lecture 169。 8 2020/11/4 Shared Information Systems ? High level view ? what are the apparent features of this style? 風(fēng)格的明顯特點是什么？ ? what are some issues regarding this style? 這種這個風(fēng)格有什么可研究的問題？ 169。 9 2020/11/4 Shared Information Systems ? Advantages ? easy to add consumers and producers of data 很容易增加數(shù)據(jù)的生產(chǎn)者和消費者 ? How about modifier? ? Issues ? synchronization（同步） ? configuration and schema management（配置和管理） ? atomicity（原子性） ? consistency（一致性） ? persistence（持久性） ? performance（性能） 169。 10 2020/11/4 Shared Information Systems Lineage ? Earliest repositories appear in batch sequential systems 早期的倉庫出現(xiàn)在批處理系統(tǒng) ? mainframes, drums, magic tapes, disc drives ? resources manually managed 人工調(diào)配資源 ? Pressure for online access to data 迫切需要數(shù)據(jù)即時存取 ? requirement to make access to data easy and instant 簡捷地數(shù)據(jù)存取 ? help to drive the shift from batchsequential to interactive processing 促進(jìn)了從批處理到交互式處理的轉(zhuǎn)變 169。 11 2020/11/4 Shared Information Systems Lineage ? Today ? shared information systems appear everywhere from the smallest business, to the most advanced scientific applications 從最小的商業(yè)應(yīng)用到最頂尖的科學(xué)應(yīng)用，信息共享無處不在 ? many applications provide access mechanisms to shared data 很多應(yīng)用提供對共享數(shù)據(jù)的存取機制 ? the Web has bee a giant distributed repository Web成為龐大的分布式倉庫 169。 12 2020/11/4 Evolution of Shared Information Systems ? Batch Sequential Systems ?flat file access (I/O) 169。 13 2020/11/4 Early File Access ? In th
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