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000-277 exam Dumps Source : IBM WebSphere Message Broker V8.0 System Administration
Test Code : 000-277
Test Name : IBM WebSphere Message Broker V8.0 System Administration
Vendor Name : IBM
: 55 Real Questions
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FRAMINGHAM, MA--(Marketwired - Jun eleven, 2013) - Correlsense, a number one IT monitoring software business, these days introduced SharePath for IBM® WebSphere Message broking service (WMB). This newest enhancement to SharePath 3.0, the company's enterprise-type APM solution for managing complex interconnected functions, is most beneficial for any organization relying on IBM middleware for its transactional spine.
As applications develop into increasingly connected, groups are using business provider Buses (ESBs) to deal with the communications between disparate purposes and services. using an ESB, however, introduces new administration challenges. They are sometimes decoupled from the core utility and execute company common sense and code which adds complexity while increasing the time to realize and isolate performance issues. not like other middleware management solutions that center of attention on infrastructure monitoring, SharePath for IBM WebSphere Message broker offers extra granular visibility into the finished stream of particular person message flows into, within and out of the ESB. This provides indisputable proof about where performance complications and blunders ensue, even if within message broking service, through which node, or inside the backend features or applications.
SharePath follows every message move via its nodes and external functions, and logs all this unique suggestions in a scalable big records repository, including parameters, values and exception error of each and every execution. in addition to extensive developed-in logging, auditing, and monitoring of all messages, SharePath offers trending and change evaluation to music efficiency over time.
SharePath for WebSphere Message broker offers middleware house owners, IT operations and production assist teams the potential to right away keep in mind dependencies and determine middleware bottlenecks. Most principally, SharePath for IBM WebSphere Message broking service:
"SharePath for IBM WebSphere Message broking service empowers groups to profit handle over a crucial business component," mentioned Nir Livni, VP of items. "companies using SharePath not must build extensive, expensive and blunder-prone logging and tracking mechanisms to be aware what took place to a particular message and even if it succeeded or failed."
SharePath for IBM WebSphere Message broker is accessible immediately as a standalone providing or as part of a complete end-to-conclusion APM solution in accordance with SharePath three.0. extra counsel may also be found at http://www.correlsense.com/options/company-want/sharepath-for-ibm-websphere-message-broking service/
About Correlsense Correlsense develops application performance management and IT monitoring software. it's the APM fabricated from option for company and IT operations managers that rely on complex and critical business applications. Correlsense paints a complete and dynamic graphic of IT carrier degrees and efficiency for purposes that span mobile, SaaS, cloud, facts middle and legacy mainframes. Correlsense became based in 2005, is privately held and SharePath shoppers encompass one of the most world's greatest fiscal, telecom and retail firms. For more guidance, consult with www.correlsense.com.
this article suggests a arms-on strategy of tips to look at various your IBM WebSphere Message broker options in a simple approach using modern Groovy and Java equipment.
The method taken could really be used with extra or much less any integration platform despite the fact some actually do have constructed-in methods of doing it, like Apache Camel.Introduction
testing dispensed business integration using in their case IBM WebSphere MQ and IBM WebSphere Message broking service (IBM call it for his or her advanced ESB) isn't any so easily executed as it should be.
The in-built guide for checking out is not assisting us lots (see examine customer in elements).
At my latest project there's a wealth of diverse strategies: JMeter, SoapUI, RFHUtil, MbTest, JUnit, conclusion-to-conclusion user checking out, in-residence developed trying out tools.
I need a far better approach that works neatly with their CI server and here is the beginning of that experience. To exhibit i will use a vanilla IBM WebSphere Message broking service with default configuration (see appendix for links) and then one of the basic application samples for coordinated request/reply.imagine all you needed to write turned into… where: testFileName | expectedFileName | requestQ | replyQ | ignoreNamedElementsNames 'request1.xml' | 'reply1.xml' | 'GET_REQREP_IN' | 'GET_REQREP_OUT' | [ 'CompletionTime', ‘e2’] 'request2.xml' | 'reply2.xml' | 'GET_REQREP_IN' | 'GET_REQREP_OUT' | [ 'CompletionTime' ]
To “inject” the statistics into the test that should be run once per row above (omitting the details)given: "A XML payload to ship" and: "An expected reply XML payload" and: "Ignoring changes for configured aspect names" when: "The request is shipped" then: "A reply is obtained" and: "The reply payload carries equivalent XML"
since I aren't in a position to accurately structure this text with regards to photographs and so on., you are going to need to study the total story at my GitHub wiki as an alternative.
IBM has parlayed its middleware heritage into what valued clientele describe as a wide set of service-oriented structure (SOA) items and capabilities.
IBM's MQSeries middleware grew to be an software integration linchpin for many corporations throughout the Nineties. The vendor has because retooled its items for an SOA environment, adopting net features requirements, which utility businesses use to boost interoperability between disparate systems. The business has also introduced to its product line by way of acquisition: remaining 12 months IBM bought Webify, an Austin, Texas, enterprise that makes utility for building provider-oriented architectures, for an undisclosed volume.
WinterGreen analysis, a Lexington, Mass.-primarily based market research enterprise, cites IBM as the market leader in SOA infrastructure, with a fifty three% market share.
a big portion of IBM's SOA providing resides below WebSphere, integration middleware that encompasses IBM's commercial enterprise carrier bus and message broking service products. WebSphere also covers application server and repair registry aspects.
different product families additionally play an element. Rational, as an instance, offers tools for creating features, whereas Tivoli offers software for managing SOA deployments.
Vijay Sonty, chief guidance officer at Broward County (Fla.) Public schools, calls IBM the "Rolls-Royce" of SOA—a choicest-in-class solution. He also elements to the breadth of IBM's offerings and the incontrovertible fact that the school equipment has been an IBM shop for years.
Sonty says now not every consumer needs a Rolls-Royce solution, but notes that Broward County Public faculties required middleware in a position to bringing collectively 300-plus purposes and a "world-category portal" to deliver an on-ramp for directors, lecturers and students. Sonty and his crew are the use of IBM's WebSphere to supply a middleware layer that allows for unified access to legacy applications.
The college equipment is pursuing its SOA-driven integration challenge in phases. phase one, completed ultimate year, concerned the introduction of a portal for directors and information counselors that brought together the district's student assistance device and information warehouse.
Ameriprise financial, in the meantime, introduced in IBM to assist unify its account administration programs so customers may more with ease stream cash from one account to a further.
Tracy LeGrand, chief architect and vice chairman of expertise strategy and structure at Ameriprise fiscal, says probably the most reasons the enterprise went with IBM for SOA turned into the enterprise's software and repair scope.
As Ameriprise pursued the capabilities strategy, IBM provided its WebSphere MQ and WebSphere company Integration for specifications-based mostly integration. Ameriprise designed features with Rational software.
based on LeGrand, IBM's latest SOA product set contrasts with its previous lineup, which left gaps in places such as a carrier registry, which is used to preserve song of the capabilities available to inner builders. IBM remaining October introduced a ramification of its provider-oriented structure offerings, which had focused on the mixing and middleware elements of the class. Additions to IBM's portfolio include company method management application and a registry.
nonetheless, IBM's extensive portfolio—the company lists 23 choices on its SOA web page—can prove complicated to navigate, in accordance with Sonty, who would like IBM to speak a large-picture message on the way it intends to deliver its items collectively.
"They evidently need to do a more robust job of packaging and explaining how five utility divisions work together," he says. "The message isn't there."
Sandy Carter, vice president of SOA and WebSphere approach, channels and advertising at IBM, says huge Blue goals to attain customer groups who need diverse levels of product integration. Some valued clientele, she says, take a home made strategy, while others need IBM's SOA expertise packaged collectively so it's simpler to get started.
IBMNew Orchard RoadArmonk, big apple 10504(914) 499-1900www.ibm.com
TICKER: IBM (NYSE)
Sam Palmisano Chariman & CEO
Steve Mills SVP & group government, software group
items: WebSphere points an software server, business carrier bus, portal and messaging equipment.
consumers: Boscov's, Cerner Corp., Fifth Third financial institution, HSBC, Pitney Bowes, VF Corp., Wachovia
FINANCIALS2007FYTD* 2006FY 2005FY income $22.03B $91.42B $ninety one.13B web profits $1.84B $9.49B $7.99B R&D Spending $1.51B $6.11B $5.84B
*For first three months ended March 21, 2007. Fiscal year ends December 31.
supply: business reports
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IBM has parlayed its middleware background into what customers describe as a broad set of service-oriented architecture (SOA) products and services.
IBM's MQSeries middleware became an application integration linchpin for many enterprises during the 1990s. The vendor has since retooled its products for an SOA environment, adopting Web services standards, which software firms use to increase interoperability between disparate systems. The company has also added to its product line via acquisition: Last year IBM purchased Webify, an Austin, Texas, company that makes software for building service-oriented architectures, for an undisclosed amount.
WinterGreen Research, a Lexington, Mass.-based market research firm, cites IBM as the market leader in SOA infrastructure, with a 53% market share.
A large portion of IBM's SOA offering resides under WebSphere, integration middleware that encompasses IBM's enterprise service bus and message broker products. WebSphere also covers application server and service registry elements.
Other product families also play a part. Rational, for example, provides tools for creating services, while Tivoli offers software for managing SOA deployments.
Vijay Sonty, chief information officer at Broward County (Fla.) Public Schools, calls IBM the "Rolls-Royce" of SOA—a best-in-class solution. He also points to the breadth of IBM's offerings and the fact that the school system has been an IBM shop for years.
Sonty says not every customer needs a Rolls-Royce solution, but notes that Broward County Public Schools required middleware capable of bringing together 300-plus applications and a "world-class portal" to provide an on-ramp for administrators, teachers and students. Sonty and his team are using IBM's WebSphere to provide a middleware layer that enables unified access to legacy applications.
The school system is pursuing its SOA-driven integration project in phases. Phase one, completed last year, involved the creation of a portal for administrators and guidance counselors that brought together the district's student information system and data warehouse.
Ameriprise Financial, meanwhile, brought in IBM to help unify its account administration systems so customers could more readily move funds from one account to another.
Tracy LeGrand, chief architect and vice president of technology strategy and architecture at Ameriprise Financial, says one of the reasons the company went with IBM for SOA was the firm's software and service scope.
As Ameriprise pursued the services approach, IBM provided its WebSphere MQ and WebSphere Business Integration for standards-based integration. Ameriprise designed services with Rational software.
According to LeGrand, IBM's current SOA product set contrasts with its previous lineup, which left gaps in places such as a service registry, which is used to keep track of the services available to internal developers. IBM last October announced an expansion of its service-oriented architecture offerings, which had focused on the integration and middleware aspects of the category. Additions to IBM's portfolio include business process management software and a registry.
Still, IBM's extensive portfolio—the company lists 23 offerings on its SOA Web page—can prove difficult to navigate, according to Sonty, who would like IBM to communicate a big-picture message on how it intends to bring its products together.
"They clearly need to do a better job of packaging and explaining how five software divisions work together," he says. "The message is not there."
Sandy Carter, vice president of SOA and WebSphere strategy, channels and marketing at IBM, says Big Blue aims to reach customer groups who want different levels of product integration. Some customers, she says, take a do-it-yourself approach, while others want IBM's SOA technology packaged together so it's easier to get started.
IBMNew Orchard RoadArmonk, NY 10504(914) 499-1900www.ibm.com
TICKER: IBM (NYSE)
Sam Palmisano Chariman & CEO
Steve Mills SVP & Group Executive, Software Group
PRODUCTS: WebSphere features an application server, enterprise service bus, portal and messaging tools.
CUSTOMERS: Boscov's, Cerner Corp., Fifth Third bank, HSBC, Pitney Bowes, VF Corp., Wachovia
FINANCIALS2007FYTD* 2006FY 2005FY Revenue $22.03B $91.42B $91.13B Net Income $1.84B $9.49B $7.99B R&D Spending $1.51B $6.11B $5.84B
*For first three months ended March 21, 2007. Fiscal year ends December 31.
Source: Company Reports
NewsSOA for Your Home
He described an architectural project concerning his own home that has taken him three years to build -- in between traveling and working for IBM. The home is not quite "live" yet -- that launch is scheduled for Oct. 15. However, he provided a sneak preview of what's to come with his presentation, "SOA in the Home -- With MQ, Message Broker and RFID Integration."
Rhys Jenkins can control much of the functions of his 12,000-square-foot home (a renovated farmhouse) using an Apple iPhone, which is his current preferred interface device. He's also been experimenting with voice recognition technology and a talking interface, which seemed a little spotty -- at least when he tried to get his Apple laptop to tell him a joke during the presentation.
The house's internal services include camera motion detection, a front door area that scans RFID tags implanted in the shoes of family members, house lighting control, door locking and many other such functions. If someone comes to the front door and an RFID link is not read, then the service will turn on a camera and transmit the image of the visitor to the Rhys Jenkins' TV set, using Channel 88.
External services include weather reports retrieved from the National Oceanic and Atmospheric Administration's (NOAA's) National Weather Service and maps via Google GMaps. There's also a rodent detection system for the barn. Vermin stand little chance against Rhys Jenkins' service that records a "mouse down event." Traps triggered in the barn also transmit an image of the kill event, so there's no need to keep checking the set traps. The system has snagged five mice so far.
Rhys Jenkins is using a Windows-based IBM WebSphere MQ-Message Broker as a representative state transfer (REST) interface between his Macs and PCs using PHP AJAX. It allows him to call the NOAA weather service and parse the response. MQ-Broker will also enable him to do a Web service call Charter.net to see what's on TV.
He's also using an 802.11n Wi-Fi network for the home, consisting of two Apple AirPort radios. The wireless network also includes an AirPort Express radio, two Linksys 802.11b radios and one Cantenna antenna. He described the 802.11n devices, which use the specification that enables greater multimedia throughput, as "infinitely better" than previous 802.11 iterations.
The network is designed to withstand failures, so in addition to wireless connectivity, Rhys Jenkins used Cat6 wiring in some cases to enable 10 Gbps Ethernet connectivity.
The RFID equipment, most of which is made by Texas Instruments, Rhys Jenkins said, can see and program a tag that is not battery assisted. However, the read distance is short, at about nine to 12 inches. He performs RFID interface coding using Applescript but rejected using Texas Instruments' sample code, which he called "utterly useless."
He didn't have much praise for RFID technology, saying that the only thing that RFID tags are good for is adding them to shipping containers for tracking purposes.Currently, there are three main standards for radios used with RFID chips, along with 80 variants, which is why things don't work well, he said.
Rhys Jenkins uses Chicken of the VNC (virtual network computing) for his client, allowing him to drive all of his computers from a single interface. Likewise, VMware Fusion for the Mac helps him to run his IBM Broker and Macs all on the same machine. He uses WAMP (Windows, Apache, MySQL, PHP) to drive his Web site, noting that "PHP is a thousand times easier to code than Java."
In general, Rhys Jenkins said he talks about his house because he thinks it's a cool example of SOA, and to detail the things that go wrong. It's just a normal software engineering project.
"All of this SOA stuff is normal systems integration," he said. The special part is the fact that you can use things like SOAP and WSDL [Web Services Description Language] to talk to services. For example, my talking interface can be talked to through SOAP interfaces. But there is nothing special about SOA and ESBs [enterprise service buses] -- I've been doing it for years -- [although] some of the technology now is getting to the point where it makes things useful."
Kurt Mackie is senior news producer for the 1105 Enterprise Computing Group.
While the appliances are quite versatile and can thus be used to solve many different types of problems (and implementers have been quite creative in this regard), they find there are a few common use cases that are typical. These generally focus around security, performance, cost savings, and integration. In the following sections, they discuss each of these in more detail.Solving Security Problems
Let’s think about what it would take to deploy a software-based proxy product in the DMZ. Each of the layers of the ‘typical server’ shown in Figure 1-2 requires specialized skills to install and maintain. Particularly for DMZ deployments, the server hardware itself must be hardened. In highly secure environments, this can involve removing any components that might allow information to be taken from the server, such as USB ports and writeable CD/DVD drives. The operating system must also be hardened, removing components such as telnet and sendmail.3 Often, this results in other layers of the software stack not installing or operating properly! If you are successful in installing the application software stack, it must be hardened as well. These are common requirements for high security environments such as financial companies, intelligence services, and military applications.
Although software-based DMZ components can be hardened successfully, it is a lot of work. Compare this with the simplicity of installing a dedicated, highly secure hardware appliance, purpose built to do a few things well with fairly simple administrative interfaces, as shown in Figure 1-3.
The appliances are hardened out of the box. For example:
The age-old rule for the DMZ is to terminate client connections there and then proxy connections to the backend from the trusted DMZ servers. However, in the field they find even more stringent security policies that do not warrant any traffic (even proxied through these secure intermediaries) to the backend until the client is authenticated and authorized. This is referred to as perimeter security and is an increasingly common requirement, driving sales of DMZ security products such as TAM. Later, they show how DataPower appliances can also solve this problem.
Another requirement for DMZ components is to virtualize or hide the implementation details of backend servers and applications. Typical DMZ products interact only with the protocol layer of the network stack, so they can hide things like hostname/IP, ports, and URIs, whereas XML-centric application proxies such as DataPower appliances can virtualize on a much more intelligent basis and can analyze the entire message stream.
A strong reason for using these types of appliances is the burgeoning risk of systems becoming compromised by XML-based threats. Just as once upon a time they felt HTTP to be innocuous, today they are susceptible to underestimating what can be done by virtue of XML. In Chapter 20 “XML Threats,” they show how entire infrastructures can be brought down using small, simple, well-formed XML files. Only hardware appliances have the processing power to check for the many variations of XML threats.
Another common security problem is a mismatch in the specification levels or credential formats of various technologies across large corporate IT infrastructures. For example, consider a marketing IT silo running on Microsoft®.NET using WS-Security 1.0 and SPNEGO credentials for identity and a manufacturing silo using IBM WebSphere Application Server (WAS), WS-Security 1.1, and LTPA credentials for identity. In today’s ESB-driven SOA architectures, a single transaction may have to pass through both environments, so this presents challenges. Because DataPower appliances incorporate a wide range of the latest specification implementations and credential formats, they can be used to transform messages and credentials to fit the target each step of the way. Notice that this can be used to achieve cross-platform single-signon (SSO), although that also depends on other factors such as having a common registry.To Lower Total Cost of Ownership (TCO)
Refer back to the scenario in Figure 1-2, where there are numerous skills required to install and maintain a typical server and software stack. Now think of this in terms of the staff required and cost to the organization. With self-contained appliances where the operating system and file system characteristics are irrelevant from an administrative perspective, this becomes much less work. The function of the appliances is dedicated and streamlined, hence the administrative tasks and interfaces tend to be as well. For example, in the scenario in Figure 1-2, you have to continually install fixes and updates at every layer of the stack. However, for appliances, you typically do this by uploading a small firmware update and rebooting, which takes only minutes. In the server scenario, you have multiple different administrative consoles to manage the layers of the stack; with the appliances, you have only one console.
The TCO return does not solely manifest itself in the setup and administration of the platform. Consider the silo example in the prior section—where various areas of a corporate IT infrastructure are running Web services across different platforms, such as those from IBM, Microsoft, and BEA. If the corporation has one set of policies for security and SLM that need to be implemented across all these platforms, then it must be done multiple times, by multiple people, with skills on each platform. Not only is the configuration redundant and therefore expensive, but this problem is repeated each time it needs to change, and there is always the risk that the policy will not be implemented exactly the same on each platform, which can lead to security holes or application failures. This is depicted in Figure 1-4.
Figure 1-4 Redundant administration versus simplified appliance model.
A more concrete example can be implemented by creating a single service that acts as a Web service proxy on the DataPower appliance, importing the WSDL files for the Web services providers on each of those backend platforms, and then applying the security and SLM policies on the proxy, thereby gaining policy definition and enforcement one time for all platforms. All this is based on standards that they discuss later, not only Web services itself, but also the accompanying standards such as WS-Security for security, WS-Policy for policy definition, WS-Addressing for endpoint resolution, and WS-Management and WSDM4 for management.Enhancing Performance
XML is the foundation on which many modern architectures are built—it has evolved into SOAP for Web services and is found across the breadth and depth of the SOA stack and related specifications. Over time, it has evolved from a simple markup language to something quite complex and sophisticated. Of course, the problem as far as performance is concerned is that XML is fairly easy for humans to read, but not for computers. It is a verbose representation of data and typically requires significant resources in terms of CPU power and memory to process. This overhead is typically found in parsing the XML document into an in-memory representation and in validating the XML against its schema file.5
Consider the impact of parsing and validating the storm of XML/SOAP documents that hit your systems during peak production levels. Now consider the overhead of security that may be embedded in those messages—validating client identities against LDAP servers, verifying digital signatures, and decrypting encrypted data. This requires a tremendous amount of processing power and time and robs precious cycles away from what your backend systems should really be doing—focusing on transactional business logic! Also consider the absolute waste of expending these cycles for messages that come in badly formed, with schema violations or illegitimate security issues. The cycles expended on processing them and handling the errors are wasted. Figure 1-5 shows a graph demonstrating the CPU overhead of various common tasks. (Notice the parsing level is low here—the main hit when parsing is memory utilization.) Notice the impact of security operations. This can be helped somewhat with hardware-assisted acceleration, but the cost-benefit of hardware acceleration boards is often debated. Also note that abusing these security features to consume CPU resources is one way of mounting attacks.
A grand solution for this, of course, is to use appliances to do all that heavy lifting at near wire speed. As you will see when they discuss the appliance characteristics, they are amazingly fast and can handle these tasks at orders of magnitude faster than software-based solutions running on standard servers. Now focus on another scenario—one where the appliance makes sure that only clean traffic gets to the backend systems. Imagine the huge differential in available processing power on the backend if the validation and security tasks are done by the time the traffic gets there. The appliances can validate schemas, verify signatures, decrypt the data, and more. This can often result in huge performance returns, depending on considerations such as message sizes, cipher strengths, network latency, and so forth.
Speaking of message sizes, this is often another major stumbling block for Java-based software systems processing XML. In modern day real-world systems, they are now seeing huge SOAP messages on the order of hundreds of megabytes or even gigabytes in size. The conundrum is how to process these, given constraints on maximum JVM heap sizes in many platforms. Due to aggressive built-in streaming and compression, appliances can handle messages larger than their actual memory space.
On another message-related topic, consider applications that do XML transformation between differing schemas; for example, an application that consumes XML purchase orders and must understand a variety of incoming purchase order formats from business partners, and then transforms each into the one “golden” purchase order schema that this company uses. These transformations can be quite expensive to process (see Figure 1-5) and result in bloated application code. They all know that line-for-line, application code is expensive in terms of programmer time, testing, and debugging. Now consider the effect on the application if the transformations were moved out to the appliance on the frontend so that the backend application now gets only the one “golden” schema format. Yes, their application has gone on quite a diet, is less expensive to maintain, and is much faster. One field scenario consisted of a frontend cluster of Java EE applications to do such transformations to keep the cluster of business logic applications behind it lightweight. However, since this was running on a platform that charged for CPU time, and given the overhead of XML transformations shown in Figure 1-5, it was expensive. The solution was to move the transformation layer out to DataPower appliances. The result was a huge cost savings and orders of magnitude faster processing.Integrating Platforms
In the previous section, they discussed a scenario in which the appliance could be used to bridge differences in standards specifications (WS-Security v1.0 versus. v1.1) and identity credentials (SPNEGO versus LTPA) across systems. This is one good example of easily integrating disparate platforms, particularly when the standards and specifications are in flux. It is difficult for software-based solutions running on standard servers and products to keep up with this. On the appliance, you load a firmware update to get the latest and greatest.
However, there are other issues that arise when integrating different platforms. Consider a scenario in which a medium-sized business XYZ Corp has its infrastructure running on legacy platforms and technologies, perhaps mainframe-based EDI. The business partners that they depend on have long since moved their platforms to Web services and are telling poor XYZ Corp that they can no longer afford to support XYZ’s legacy interface to that system, and they must provide a modern SOA or Web services interface or lose the business. This puts XYZ in a bad position; what will it cost to retrain its programmers, rewrite its COBOL applications, and revamp the backends to its Java EE platforms? Likely, it would be a staggering amount! A common solution to this problem is to place appliances at the front of the network as proxies, cook up a WSDL file to describe some Web services, begin receiving the ASCII SOAP messages from the now-happy business partners, and convert them on-the-fly to EBCDIC EDI or COBOL Copybook messages and send them over MQ or IMS Connect to the legacy backend. The backend does not have to change, and no programs have to be rewritten—a win-win!
Due to the variety of protocols (HTTP(S), FTP, MQ, JMS/JFAP, IMS, NFS, TIBCO, MQ, ODBC, SNMP, and so on) supported by the DataPower appliances, there is a wealth of opportunity for protocol bridging, content enrichment, and integration between platforms. Notice that the previous scenario involved message transformation. The XI50 DataPower appliance can handle either XML-to-XML or non-XML transformation scenarios, meaning that messages can be transformed to the appropriate format for any intended backend.
Another common and age-old scenario related to integrating platforms is dynamic routing. Because it is often a requirement to make dynamic routing decisions “on the edge of the network,” they have DMZ Web servers, proxies, and load balancers handle this. The problem is that they can understand only the protocol and not the payload of the message. To accomplish the goal, applications place some value in the protocol header to facilitate the content-based routing. As an example, if they want any purchase orders over one million dollars to be routed to high-priority servers, the sending application would place a cookie or attribute in an HTTP header or URL parameter. The Web server, proxy. or load balancer in the DMZ would be configured to check for this and then route the traffic accordingly. The problem with this scenario is that you have to put this hack in the applications and the HTTP payload, potentially disclose message data to attackers, and involve the sender/client. This solution doesn’t scale because if you continually do this, the HTTP header and application code bloat.
Because SOA appliances are XML-savvy and can use technologies such as XPath, they can check inside the message payload to look for the actual <po_value> element rather than alter the application and HTTP header. If the message is encrypted, you don’t need to expose this by externalizing the data; you can just decrypt the message and check the value, and then route accordingly. The client in this case does not have to be complicit—the routing is truly dynamic and transparent. The XML Aware Network layer is shown in Figure 1-6.
One last important feature in regard to the integration story is the use of appliances as ESBs. The appliances fulfill the model of an ESB by virtue of their strong routing, transformation, mediation, and protocol-switching capabilities. IBM has other ESB products capable of implementing the ESB pattern—WebSphere Message Broker (WMB) and WebSphere Enterprise Service Bus (WESB). Each of these have unique capabilities that may suit them for particular usages. Although DataPower may be thought of as a highly secure and performant ESB, the others have features that DataPower does not have in the arenas of transactionality, persistent message handling, and the capability to work in other programming languages. They discuss ESBs in Chapter 5, “Common DataPower Deployment Patterns,” and Chapter 9, “Multi-Protocol Gateway.”
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