分散式與即時系統上的先進Java-Based中介軟體之研究

研究生: 焦信達. 研究生(外文):, Hsin-Ta Chiao. 論文名稱: 分散式與即時系統上的先進Java-Based中介軟體之研究. 論文名稱(外文):, Advanced Java-Based Middleware ... 資料載入處理中... 跳到主要內容 臺灣博碩士論文加值系統 ::: 網站導覽| 首頁| 關於本站| 聯絡我們| 國圖首頁| 常見問題| 操作說明 English |FB專頁 |Mobile 免費會員 登入| 註冊 功能切換導覽列 (167.99.71.17)您好！臺灣時間：2022/06/1807:19 字體大小：       ::: 詳目顯示 recordfocus 第1筆/ 共1筆  /1頁 論文基本資料 摘要 外文摘要 參考文獻 電子全文 紙本論文 QRCode 本論文永久網址: 複製永久網址Twitter研究生:焦信達研究生(外文):Hsin-TaChiao論文名稱:分散式與即時系統上的先進Java-Based中介軟體之研究論文名稱(外文):AdvancedJava-BasedMiddlewareforDistributedandReal-TimeSystems指導教授:袁賢銘指導教授(外文):Shyan-MingYuan學位類別:博士校院名稱:國立交通大學系所名稱:資訊科學系學門:工程學門學類:電資工程學類論文種類:學術論文論文出版年:2003畢業學年度:91語文別:英文中文關鍵詞:Java、執行緒同步機制、監督器、IP多點投射、Java訊息服務、訊息導向中介軟體、Java即時計算標準、非同步事件處理外文關鍵詞:Java、threadsynchronizationmechanism、monitor、IPmulticast、Javamessageservice(JMS)、message-orientedmiddleware(MOM)、Real-TimeSpecificationforJava(RTSJ)、asynchronouseventhandling相關次數: 被引用:0點閱:273評分:下載:38書目收藏:0 Java本身是一種為網路的存在所設計的技術。

因為它提供了平台獨立性、安全性、網路上的物件移動性、動態的類別載入、以及內建的並行與網路程式設計的支援，Java是目前開發分散式軟體的最佳選擇。

此外，由於Internet的快速成長，各種不同的嵌入式系統都會慢慢的以無線或有線的方式連上Internet。

這種趨勢將會刺激嵌入式系統的開發社群開始使用Java，並刺激它們使用Java來開發即時控制軟體。

Middleware是一種系統軟體，位於應用程式與底下的作業系統、低階軟體、與低階硬體之間。

它的主要功能是簡化應用程式設計師所要解決的某些程式開發問題、加快應用程式開發的cycle、以及改進軟體的重用性。

本博士論文的目的是，提出三個不同的middleware來分別解決三個使用Java來開發分散式與即時控制軟體時，所會遇上的問題。

第一個是並行程式設計的問題。

它是開發許多系統軟體時，所需要的基本功能，尤其是分散式系統。

Java內建的執行緒同步機制是monitor，它有以下的四點問題:一、它屬於一種叫no-prioritymonitor的分類，二、每個monitor只提供了一個conditionqueue，三、monitor缺乏對排程的支援，四、可能會在發生inter-monitornestedcall時產生deadlock。

在本篇論文裡，我們將會提出一個改良的monitor-EMonitor，來解決前述的四個問題。

本論文所要解決的第二個問題是networkIPC的問題。

Message-orientedmiddleware(MOM)是一種新的網路程式設計的paradigm。

它比較容易使用，而且也因為它的實作比較簡單，而會有比較好的效能。

Javamessageservice(JMS)是目前Java上的MOM的標準。

然而，目前大多數的JMSimplementation都是server-based的架構，集中式的server可能會增加訊息傳送的latency、成為scalaility的瓶頸、也會有single-pointfailure的問題。

因此，我們提出了一個IP-multicast-based的JMSimplementation。

它實作了JMS的publish-subscribeAPI，目的是提供一個LAN內、或Intranet內的Java程式的快速訊息交換機制。

本篇論文所要解決的第三個問題是使用Java來開發即時控制程式的問題。

Real-TimeJavaSpecification(RTSJ)是real-timeJava的標準。

作者在1999年第四季，參與了一個使用Java來開發塑膠射出成形機上的控制程式的研究計畫。

然而，當時，RTSJ的標準尚未定案，也沒有符合RTSJ標準的JVM可供使用。

因此，我們在不支援RTSJ的JVM上，實作了一個即時擴充程式庫，讓我們的合作單位可以使用Java來開發即時控制程式。

這個擴充程式庫具有以下的幾個特點:一、它實作的是RTSJ0.9版的標準的子集合。

所以，使用它開發的即時控制程式，可以很容易地被移植到未來的RTSJ-compliant的JVM上。

二、它實作時不需要修改下層的JVM，所需的下層支援機制也不多，所以，它可以很容易地被移植到各種不同的RTOS上。

因為RTSJ的標準相當複雜，不易移植，目前只有少數的主流RTOS有RTSJ-compliant的JVM。

因此，這個即時擴充程式庫，可以被看作是一個小型的、容易被移植的RTSJ的子集合。

Javainherentlyisanetwork-centrictechnology.Becauseitsupportsplatformindependence,security,network-wideobjectmobility,dynamicclassloading,andbuilt-inmechanismsforconcurrentandnetworkprogramming,Javaisthebestchoicefordevelopingdistributedsystemsoftwarecurrently.Besides,duetotheexplosivegrowthofInternet,variouskindsofembeddedsystemswillconnecttoInternetgradually.ThistrendpushestheembeddedsystemcommunitytoembraceJava,andinspirestherequirementofusingJavatodevelopreal-timecontrolsoftware.Middlewareisacategoryofsoftwaresituatedbetweenapplicationsandtheunderlyingoperatingsystems,low-levelsoftwareandlow-levelhardware.Itsmainpurposeisforsimplifyingthetaskofapplicationprogrammers,acceleratingapplicationdevelopmentcycles,improvingthereusabilityofsoftware.ThepurposeofthisthesisistopresentthreeproblemsofusingJavatodevelopdistributedsystemsandreal-timecontrolsoftware,andtoproposethreedifferentmiddlewareforhelpingapplicationprogrammerstosolvethem.Thefirstproblemisconcurrentprogramming.Itisanelementarybuildingblockfordevelopingvariouskindsofsystemssoftware,especiallyfordistributedsystems.Thebuilt-inthreadsynchronizationmechanismofJavaisasimplifiedversionofmonitor,anditsuffersthefollowingfourdrawbacks.First,itbelongstoacategoryofno-prioritymonitor.Second,itoffersonlyoneconditionqueueinamonitor.Third,itlacksthesupportforbuildingmoreelaborateschedulingprograms.Fourth,duringnestedmonitorinvocations,deadlockmayoccur.Inthisthesis,arefinedversionofmonitor,EMonitor,isproposedtosolvetheforementionedfourproblems.ThesecondproblemtosolveinthisthesisbelongstothenetworkIPCproblems.Message-orientedmiddleware(MOM)isanewparadigmfornetworkprogramming.Incomparisontothetraditionalnetworkingmiddleware,itismucheasiertouse,andcanachievebetterperformanceduetoitslight-weightimplementation.JavaMessageService(JMS)istheMOMstandardofJava.However,mostimplementationsoftheJMSstandardareserver-based.ThecentralizedJMSservermayintroducemorelatencyofmessagedelivery,maybecomethebottleneckofscalability,andmayinducethesingle-pointfailure.Hence,insteadoftheserver-basedone,hereweproposeanIP-multicast-basedJMSimplementation-theFJM(FastJavaMessaging).FJMimplementsthepublish-subscribemessagingAPIsoftheJMSstandard,anditisdesignedforefficientmessageexchangewithinaLANoranIntranet.ThethirdproblemtosolveinthisthesisisusingJavatodevelopreal-timecontrolsoftware.Real-TimeSpecificationforJava(RTSJ)istheofficialstandardofreal-timeJava.Sincethefourthquarterof1999,theauthorengagedinaprojectwhereJavawasemployedtobuildthereal-timecontrolprograminsideaplastic-injection-moldingmachine.However,atthattime,sincetheRTSJstandardwasstillunderdevelopment,noRTSJ-compliantJVMwasavailable.Tosatisfytheprojectrequirement,wedesignedandimplementedareal-timeextensionlibraryonanon-RTSJJVM.Thisextensionlibraryhasthefollowingadvantages:First,sincethelibraryAPIisderivedfromthesubsetoftheRTSJpublicdraft(version0.9),thereal-timecontrolprogramsdevelopedonitcanbeeasilymovedtoaforthcomingRTSJ-compliantJVM.Second,theimplementationofthisextensionlibrarydoesnotmodifytheunderlyingJVM,andonlyrequiresfewunderlyingsoftwareandhardwareresources.Hence,itcanbeeasilyportedtootherRTOS.BecauseportinganRTSJ-compliantJVMisdifficult,currentlyitisavailableonlyonfewwell-knownRTOS.OurextensionsuggeststheminimalimplementationoftheRTSJ,anditsportabilitycanhelpthedeveloperstobuildJava-basedcontrolprogramsonanRTOSwithouttheRTSJ-compliantJVM. 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