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Oracle Service Bus (OSB) is one of the suite from Oracle Fusion Middleware (FMW) Services. Complex architecture Integrates into network service by connecting and interacting between services and applications. Enterprises adopt to meet business requirements by able to exchange and use information. It is a standard base service, excellent performance, reliability and most important scalability to meet critical requirements. The objective of these Oracle service bus tutorials for beginners is to understand the fundamental elements of OSB and the real scenario of administering components using consoles like WebLogic Server Administration console, Service Bus Console and tools like Web Logic Scripting Tool. Also you will learn the protocols, creating users, message routing, transformation and more.
It is a messaging component of Service Oriented Architecture (SOA) suite, which is built upon for SOA life cycle management. It has a stronger capabilities to handle enterprise service abstraction i.e., quality of dealing ideas rather than events apart from providing routing and service transformation.
Based on the required functional policy made by enterprise, this enterprise service bus is designed and configured for SOA life cycle management to provide the rapid service. Service like identity, process, deployed and manage transformation of messages.
OSB is policy driven, configured and designed for enterprise service with SOA life cycle management. Intermediation, discovery, rapid service, deployment and governance are capabilities of provision.
Services like intelligent message broker, message transformation, monitoring and administration will combine to connect existing middleware software, data sources and protect the environment.
OSB believes in and follows the practices principles of SOA for standard services. no matter the underlying infrastructure, it performs functions like connecting business services to consumer services and back-end business services.
Figure shows the OSB as a service intermediary in SOA landscape.
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Depending on your specific needs, there are multiple places where you can obtain Oracle Fusion Middleware software. Few software components may be needed based on the need of services required for routing and conversion of messages. you will also need the Oracle Service Bus installer.
Oracle Service Bus required Installing Oracle Enterprise Pack for Eclipse (OEPE) for installing OSB along with IDE. It creates the home directories of Middleware and weblogic. Some required patches need to be installed for oracle SOA and Oracle AIA foundation pack. Also install required schemas for reporting and OWSM.
Hello World Service
Hello World service with both Business and Proxy Service. It exposes a service that returns a greeting message “hello” to all user names. To gain full use of this OSB, we need to design according to the requirement of business and proxy services. It interacts with SOA/BPEL web services or EIS (Enterprise Information System) and proxy do the message service by validating and transforming the incoming message with required format.
Business case requirement: OSB project is associated with some service bus application. Rather than working from an application with an oracle service bus project. We can directly access projects with the same application. By copy WSDL and schema files and past in the OSB project under some folder. To run the service application by invoke through OSB need few steps:
User enters product number to retrieve item information.
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Branching
1.Conditional Branch node in OSB: Based on conditional branch note, we can route the incoming requests to different business services.
2.Operational Branch node: It is a query based operational service.As the same example of retrieving the item with product number.
Below figure shows the primary functional areas of Service Bus.
1. Adaptive Messaging
Flexible and manipulation message handling between clients and services through Adaptive messaging.It supports different communication patterns of inbound and outbound messages such as request/response, split-join, synchronous/asynchronous and publish/ subscribe.
2. Service Security
Oracle Platform Security Services and Oracle Web Services Manager (OWSM) are bases for security services at all levels. It allows flexibility in provision of security at all levels even though it plugs-in to proxy security components.
Transport-level security, including SSL, basic authorization, and custom security credentials
Message-level security, including WS-Security, SAML, user ID and password, X509, signing and encryption and custom security credentials
Security of console including SSO and role-based access
Policy security
3. Service Virtualization
Through virtualization services with validation, it provides the communication flexibility throughout message flow in transformation, message routing, inbound and outbound messages in multiple ways, trigger alert and error handling. OSB capabilities in virtualization service as follows:
4. Configuration Framework
Full control over business services and its associated users will support this policy. This configuration framework includes test console, session management, and import/export tools. it has the ability to control the current configuration for any changes being made.
Process service discovery, synchronization of registries, and auto import are included in this framework.
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Service Management
It is a powerful runtime tool for monitoring, triggering alerts and reporting. OSB is integrated with Fusion Middleware Control for SOA-wide service management which facilitates following services:
5. Exception Handling
OSB creates XQuery resources in two services; observe that is using purely business service and configuration dynamic routing.
Publish action with Error Handling in OSB 11g
Services like callout, routing and publishing will invoke service in OSB.
Dynamic Routing
Parallel interaction of communication services executives multiple tasks to implement inbound and outbound message services.
Transport protocols
Integrate applications into enterprise-class services (web and legacy). With the support of protocol, the proxy system operates, otherwise communication services protocol is not required to use Web Services/SOAP/HTTP.
Working on JMS interactions
Operational request supported by JMS adapter of SOA suite. We can study both synchronous and asynchronous modes of process.
DB interaction Work
Oracle Enterprise Manager Fusion Middleware Control performs different types of administration tasks.
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Oracle Fusion Middleware is a collection of software products that extend across tools and services. It supports completely for development, integration, deployment, collaboration and operations of applications. It monitored runtime by using Oracle Enterprise Manager Fusion Middleware Control Console.
Transformations
Here it explains the usage of map, transform and translate the data.
XQuery Functions
XQuery Editors and Mappers
Script transformations using XQuery and a XQuery Mapper. OSB console gives an editor options for scripting transformation and provides to define XQuery responses. JDeveloper provides Expression Builder to create complex mapping. Even it evaluates at runtime.
JDeveloper Editors and Mappers
It is a graphical tool that shows the mapping about schema root elements, which comes from XSD schema files/WSDL files. After creating an XSLT mapping in JDeveloper. Need to upload a .xsl file to generate a mapper to an XSLT console.
JDeveloper has a variety of Expression Builder which create specified expressions to an existing XSLT for users to use. We get more information in following topics
1. "Creating Transformations with the XQuery Mapper" in Developing SOA Applications with Oracle SOA Suite
2. "Building XPath Expressions in the Expression Builder in Oracle JDeveloper" in Developing SOA Applications with Oracle SOA Suite
Oracle Service Bus Console Editors
For the use of users to specify a Query to get responses, XQuery/XSLT Expression Editor solutions. First need to create the user in the console and upload Xquery transformations file to the user. Then it allows the user to create complex mapping in JDeveloper. It will support reuse of XQuery in multiple pipelines.
Applying Security
Depends on Oracle Platform Security Services (OPSS) and Oracle Web Services Manager (OWSM) ensures security for web services at all levels. Security Services like authorizations, confirming identity, authentication, work mapping, and audit Oracle OWSM are used and configured first to get framework policy to manage and provide security services to the entire organization.
Built-in features allow flexibility for implementation to enable security at all the levels. Such as Secure Sockets Layer (SSL), credentials and transport level security.
Securities at levels like web services, user ID and password, Message-level, encryption, signing and client credentials.
Security in console including SSO (single-sign-on) and role access policies.
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Integrate Representational State Transfer (REST) process as combined components in oracle service bus project. First the support was for Proxy and business services of virtualization layer supported to REST. The REST service invokes the Web Services Description Language (WSDL) pipeline or split join to convert from SOAP. SOAP is a protocol used in the context of a SOA framework. Where REST invokes internal and external services, internal is WSDL and external is proxy with the need to convert from XML.
Oracle Service Bus provides the following REST support:
Certain Service Bus support the Hypermedia as the Engine of Application State (HATEOAS) approach by giving commands in the pipeline which include some features.
By creating a REST proxy service; it can be invoked from REST clients.
OSB Case-study: OSB Tutorial considering the use-case:
Note: For demo purpose, we can take Schema files and save them with relevant names in the folder Service Bus project.
Business case requirement:
Assumptions:
There are two web services for Bank Loan Process up & running on the application server
This web services can be invoked only through OSB
Two web services are
1. Default Loan approval service
2. Branch Manager for approval service
Conclusion:
That ends our introduction to the Oracle Service Bus. If you do have any queries on the same,please do not hesitate to leave a comment and we will respond to it as soon as possible. Also,if there are any areas of improvement you may see,kindly leave your feedback as well which is always much appreciated.
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