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DCE — Das OSF Distributed Computing Environment: Einführung by Alexander Schill

By Alexander Schill

Das disbursed Computing atmosphere (DCE) der Open software program starting place (OSF) ist ein Softwaretool f}r die Erstellung verteilter Anwendungsprogrammeauf Rechnernetzen. Das Buch von Alexander Schill vermittelt dem Leser einen detaillierten, praxisnahen ]berblick }ber das OSF DCE und gibt ihmdabei konkrete Hilfestellungen beim Einsatz dieser Werkzeuge. Im einzelnen beschreibt das Buch die Gesamtarchitektur des DCE, den distant method Callzur Ausf}hrung entfernter Operationsaufrufe, den listing provider zur verteilten Namensverwaltung, den protection provider zur Authentisierung und Nachrichtenverschl}sselung, das verteilte Dateisystem zur netzweiten Dateiverwaltung sowie die Komponenten zur Implementierung nebenl{ufiger Prozesse und zur Integration von computers in eine typische DCE-Workstation-Umgebung. Der Leser lernt, die Funktionen des OSF DCE zu verstehen und konkret zur Entwicklung verteilter Anwendungssoftware einzusetzen. Das Buch bietet dar}ber hinaus eine wichtige Orientierungshilfe zum Verst{ndnis der umfangreichen OSF DCE-Dokumentation.

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Extra resources for DCE — Das OSF Distributed Computing Environment: Einführung und Grundlagen

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Ahnlich arbeiten die plattenlosen Workstations, die tiber den DCE Diskless Support an DFS und andere Dienste in Cell A angekoppelt sind. Wahrend eine Anwendung ablauft, ergeben sich sehr komplexe Interaktionen zwischen den Anwendungs- und DCE-Systemkomponenten. Beispielsweise treten beliebig geschachtelte und parallele Kommunikationsmuster bei Verwendung von RPC und Threads auf. B. parallele Zugriffe der Datenhaltungskomponenten auf DFS bzw. der RPC Clients auf CDS), so daB intern ausgefeilte Synchronisationstechniken erforderlich sind.

1m folgenden werden die wichtigsten gegenseitigen Benutzungsrelationen erortert. 2-14 Zusammenwirken der Komponenten des DCE Der Thread Service wird durch den RPC verwendet, urn nebenlaufige ServerImplementierungen zu ermoglichen. Indirekt werden Threads damit auch durch fast aIle anderen Komponenten eingesetzt, da der RPC der von ihnen verwendete Kommunikationsmechanismus ist. B. Time, CDS, Security, DFS, Diskless Support und PC Integration) wie auch die Server untereinander interagieren mittels RPc.

2 Beispiele fOr konkrete Cell-Konfigurationen Abb. 2-15 zeigt drei mogliche, relativ kleine DCE-Systemkonfigurationen fUr eine Cell. Von der oben angesprochenen Replikation von DCE-Servern wird dabei zur Vereinfachung noch kein Gebrauch gemacht. Beispiel (a) stellt eine Cell mit minimaler Funktionalitat dar, die nur die obligatorischen Server umfaBt. Auf Rechnerknoten 1 sind ein Cell Directory Server und ein Security Server installiert, auf Knoten 2 befindet sich ein Time Server mit einem externen Zeitgeber.

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