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Download E-books Server Component Patterns: Component Infrastructures Illustrated with EJB (Wiley Software Patterns Series) PDF

By Markus Völter, Eberhard Wolff

A close exploration of the elemental styles underlying latest part infrastructures.

the newest addition to this best-selling sequence opens through offering an "Alexandrian-style" trend language overlaying the styles underlying EJB, COM+ and CCM. It addresses not just the underlying construction blocks, but additionally how they have interaction and why they're used. the second one a part of the booklet presents extra aspect approximately how those construction blocks are hired in EJB. within the ultimate part the authors absolutely discover the advantages of construction a procedure according to components.
* Examples exhibit how the three major part infrastructures EJB, CCM and COM+ compare
* presents a mixture of ideas and urban examples with targeted UML diagrams and wide resource code
* Forewords provided via leaders: Clemens Syzperski and Frank Buschmann

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Additional info for Server Component Patterns: Component Infrastructures Illustrated with EJB (Wiley Software Patterns Series)

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Program SERVER box example Pool part part CONTEXT setContext(aContext) shop context addInstance(inst) while the appliance SERVER is begun, it instantiates the bins for the parts it has to run. The box, in flip, instantiates an example pool, then instantiates an element and an appropriate part CONTEXT. It presents the part CONTEXT to the just-created part example, which shops it for later use. final yet no longer least, the box provides the recent part example to the example pool. the method of making an element and an element CONTEXT, in addition to the addition of the example to the pool, is repeated until eventually the predefined variety of situations comes in the example pool. If the part must effect technical matters at once, it may well name the respective operations at the part CONTEXT. Examples contain committing or aborting a transaction or acquiring protection information regarding the caller or the present operation: changed 12:33 PM eleven September 2002 chapter4. fm 143 Required Interfaces part part CONTEXT Transaction defense info getTransaction() commit() getSecurityInfo() getCallerCredentials() abortTransaction() This series diagram includes 3 various things: • to start with, the part makes use of the part CONTEXT to appear up the Transaction item linked to the present operation. It then calls commit() in this item. • Secondly, it retrieves the SecurityInfo item to get information regarding the credentials of the caller of the present operation. • As illustrated within the 3rd case, the part CONTEXT may additionally include short-cut operations for the most common requests. right here, the part calls abortTransaction(), that's essentially a shorthand for getTransaction(). abort(). whilst an element example desires to use an exterior source comparable to a database connection, it makes use of the part CONTEXT to appear up the COMPONENT-LOCAL NAMING CONTEXT and get the source manufacturing facility, which in flip creates the source: transformed 12:33 PM eleven September 2002 chapter4. fm 144 an element and its atmosphere part part part- CONTEXT neighborhood NC NAMING source manufacturing facility source Pool Connection getNamingCtx() lookup("aDBConnection") map("aDBConnection") lookup("mycompany/resources/SomeDBConnection") getConnection() AM FL Y findFreeConnection() someOperation() release() to start with, the example makes use of the part CONTEXT to entry the in this context it calls lookup(), providing the logical identify of the necessary source. TE • returnToPool(this) COMPONENT-LOCAL NAMING CONTEXT. • The COMPONENT-LOCAL NAMING CONTEXT makes use of details supplied within the ANNOTATIONS to map the logical identify to the particular identify of the source within the worldwide NAMING context. • the example then appears to be like up the source within the international NAMING context, utilizing the respective mapped identify. As pointed out above, the look-up really returns a source manufacturing facility for the necessary source.

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