c06.fm in .NET

Draw qr codes in .NET c06.fm
QR Code reader for .net
Using Barcode Control SDK for .net vs 2010 Control to generate, create, read, scan barcode image in .net vs 2010 applications.
Extension Patterns
Integrate quick response code with .net
generate, create qr codes none in .net projects
Interactions among the patterns
Qr Barcode barcode library on .net
Using Barcode scanner for visual .net Control to read, scan read, scan image in visual .net applications.
The following sequence diagram shows how a client uses an INVOCATION INTERCEPTOR to add a security token to each invocation. The security token will be used within the server application to authenticate the client.
Barcode development with .net
using vs .net toconnect bar code for asp.net web,windows application
Framework Facade
Produce bar code on .net
using barcode creator for .net crystal control to generate, create bar code image in .net crystal applications.
Control qr code jis x 0510 image on visual c#
using barcode integrated for vs .net control to generate, create qr barcode image in vs .net applications.
QR Code JIS X 0510 barcode library with .net
using barcode maker for aspx.net control to generate, create qr-codes image in aspx.net applications.
Visual Studio .NET quick response code developmentfor vb.net
use visual .net qr code generator toassign qr barcode on visual basic.net
sci:Security Client Interceptor
Get gs1 - 13 for .net
using .net framework crystal toprint european article number 13 in asp.net web,windows application
Client Proxy
Compose pdf417 with .net
using .net vs 2010 togenerate barcode pdf417 on asp.net web,windows application
Bar Code generating for .net
generate, create bar code none for .net projects
i:Invocation Data
USPS OneCode Solution Barcode integrating on .net
using barcode integrating for .net vs 2010 crystal control to generate, create usps intelligent mail image in .net vs 2010 crystal applications.
Interceptor Registry
Code 3/9 barcode library on visual c#
using barcode encoder for visual studio .net control to generate, create barcode 3 of 9 image in visual studio .net applications.
c: Invocation Context
Bar Code development in .net
use rdlc reports net bar code encoder toincoporate barcode in .net
Client Message Handler
.NET 1d barcode encodingwith visual c#
generate, create linear barcode none with c#.net projects
Generate ucc ean 128 for office excel
using office excel toinclude ean/ucc 128 in asp.net web,windows application
.NET Windows Forms Crystal data matrix barcode implementon visual basic
using visual studio .net (winforms) crystal toget data matrix ecc200 in asp.net web,windows application
invoke(p, "anOperation", {} )
Code-128 barcode library for .net c#
use an asp.net form crystal uss code 128 implementation toassign code 128b in visual c#.net
Integrate barcode on microsoft word
use microsoft word barcode integration todraw barcode in microsoft word
Control code 128 code set c size on word documents
uss code 128 size in microsoft word
add("securityToken", aToken)
As the diagram shows, the client registers a security interceptor with the framework facade, a Facade [GHJV95] object that provides access to the distributed object middleware infrastructure on start-up. When the client invokes an operation, the REQUESTOR uses the registered INVOCATION INTERCEPTORS to add the security token to the INVOCATION CONTEXT transparently. The invocation itself is passed to the interceptors as an invocation data object. Potentially, the interceptors can change the information in this object and thereby manipulate the invocation. The same happens on the server side. The respective parts in the server application are shown next. An INVOCATION INTERCEPTOR is used to access the security token in the INVOCATION CONTEXT. The token is used to authenticate the client, and the operation is invoked only if access can be granted. If the token is invalid, a security exception is raised and a REMOTING ERROR is sent back to the client. In the following sequence diagram, we assume that the interceptor has been registered by the server application upon start-up, using the server-side framework facade. Here, the interceptor decides
24.09.2004 21:08 c06.fm 0.3
Interactions among the patterns
whether the invocation can be performed or, if the security token is not valid, the invocation is rejected using a security exception.
Server Message Handler
i:Invocation Data
c: Invocation Context
Interceptor Registry
ssi:Security Server Interceptor
Remote Object
get("securityToken") opt [token is ok]
opt [token is not ok]
throw ( SecurityException ) report Exception back to client
Session handling is another interesting feature that can be implemented easily using the patterns introduced in this chapter. As explained more deeply in 13, Related Concepts, Technologies, and Patterns, sessions can be used to provide state to otherwise stateless remote objects. Using a client-specific session object, instead of making all the remote objects stateful, CLIENT-DEPENDENT INSTANCES makes scalability, failover, and load-balancing easier to achieve in most cases. The example in the next diagram uses non-persistent sessions. These are only stored in memory by the SessionRegistry. If persistent sessions must be supported, the respective INVOCATION INTERCEPTOR would have to make sure the session data is loaded in beforeInvocation and also save potential changes in afterInvocation. In the example below, beforeInvocation handles the session using the session registry and afterInvocation does nothing. The sequence diagram shows two session-handling scenarios: The session does not yet exist. A session object is created, added to the session registry, then used for the invocation.
24.09.2004 21:08 c06.fm 0.3
Extension Patterns A session object is found. It can therefore be obtained and used for the invocation. In the sequence diagram, we see that the remote object instance can optionally interact with the session object. Here, we store and retrieve values from the session object. This requires the remote object to know the current session object. The INVOCATION INTERCEPTOR can be used to add this information to the invocation.
c: Invocation Context
i:Invocation Data
si:Session Server Interceptor
Session Registry
Remote Object
s: Session
beforeInvocation(i,c) clientID := get("ClientIdentifier")
opt [ no session found for client ]
{} := getSession(clientID)
addSession(clientID, s)
opt [ session found ]
s := getSession(clientID)
someMethod(x) x := getValue("x") incr(x) storeValue("x", x) afterInvocation(i,c)
24.09.2004 21:08
Extended Infrastructure Patterns
Extended Infrastructure Patterns This chapter presents patterns that are used to implement advanced features of distributed object middleware. While they are part of the infrastructure, they are still visible and relevant to the developer who is using distributed object middleware.
monitors optimizes resource consumption
Remote Object
manages lifecycle for
updates client's
on ati ap loc y for s pe ide enc d of ar rov spar p n LOCATION s an ts lik tra ps s se FORWARDER e u e ro iz g n a LOCAL OBJECT g or LIFECYCLE MANAGER CONFIGURATION GROUP