Designing Conceptual Framework for Aligning Service Oriented Architecture with Business Process

A problem in most of the organizations is to find the best way to mature their business processes. Process maturity can make the organizations more profitable and competent for other competitors. The problem can be solved by aligning service oriented architecture (using web services) with business processes within the organization. The purpose of this paper is to design a conceptual framework for aligning business processes with the Service Oriented Architecture and then prove the framework’s validity using simulation. An organization is working in education sector and wants to integrate its multiple web applications to allow data flow from one system to another. The framework will help the organization to align business process of service oriented architecture and to easily mold their business process according to business needs. The framework’s validity will be proved by simulating the entire process using Yet Another Workflow Language (YAWL).


Introduction
A business process is a collection of activities that takes one or more kinds of input and creates an output that is of value to the customer [1].Business Process Reengineering (BPR) is a process-centered change management tool that is used to control the dynamic behavior of business processes and that allows us to examine business processes and redesign them, and thus can improve the service effectiveness and cost efficiency.
Section 1 gives the introduction of Service Oriented Architecture with basic and enhanced framework of SOA.In Section 2, we will discuss various issues related to business process reengineering, service oriented architecture and enterprise service bus.Section 2 will summarize the research done in the domain of BPR, SOA's approaches/structure, failure/success indicators for SOA, SOA impacts and its implementation in different industries.In Section 3, we will discuss the methodology used in our research.Section 4 will simulate the implementation of Service Oriented Architecture.Conclusion and future work will be presented in the next section.

Service Oriented Architecture
Service Oriented Architecture (SOA) is a services based software integration solution for most of the systems.It is a loosely-coupled architecture designed to meet the business needs of the organization.
Key features of Service oriented architecture are: • Divides our code in reusable modules and encapsulates design decisions in modules.
• Modules should be combined with each other following loose coupling for different purposes.
• Easily respond to changes and make maintainability easier.
• Improves productivity, agility, and speed for both business and IT.
• Aligns IT services to business and delivers faster services.
Reusability, flexibility and maintainability are the main powers of service oriented architecture.SOA can provide following benefits to business.1) Efficiency: Transform business processes from replicated processes into highly leveraged shared services that cost less to maintain.
2) Responsiveness: Rapid adaptation and delivery of key business services are to meet market demands for increased service levels to customers, employees, and partners.
3) Adaptability: More effectively rollout changes throughput the business with minimal complexity and effort, saving time and money.
Basic interactions of web services in SOA are given in Figure 1.

Basic Framework of SOA
Service providers publish their services in a service directory called Universal Description, Discovery and Integration UDDI.Services' description and their usage are defined using Web Service Description Language in XML format.Service requester search for the desired service in service directory and send a request to the service provider to bind or use the service.Message passing between service provider and service requester is managed by the SOAP protocol in XML format.

Enhanced Framework of SOA
There could be multiple requesters for a service at a time and it is difficult for the provider to serve all requestors without any delay.In this situation, ESB Enterprise Service Bus serves as a middleware between service provider and requesters and is responsible to manage connection and interaction between service provider and service requesters.It is like a Hub in networking.ESB: ESB serves as a middleware in SOA.Service provider publishes services on ESB and service users can invoke the services on the ESB according to their business requirements [3].ESB provides a set of infrastructure capabilities, implemented by middleware technology, that enable the integration of services in an SOA.
SOAP: Simple Object Access Protocol provides a framework that manages the interaction between requester and responder through message passing.An example of SOAP format is in Figure 2.
BPEL: Business Process Execution Language is an XML based standard for defining business processes.It supports processes which exchange information by using web service interfaces [4].

Review of Various Issues
We studied various issues regarding SOA.These issues are very important because to design a framework based on web-services it requires to tackle critical complications carefully.

Business Process Reengineering
Business process is the most abstract entity of process technology.Two important aspects of dynamic behavior of a business process are, 1) variability (e.g.customer arrival or customer service time), 2) Interdependence (number of decision points that affect the overall performance of the system) [5].
In order to control this dynamic behavior of business process, a methodology of Business Process Reengineering BPR was introduced to accommodate changes to business processes and to align the business processes with the strategic aims of the organizations.Improvements in efficiency, effectiveness, productivity, speed of services, and cost savings are the primary objective of Business Process Reengineering [1].Business Process Reengineering implementation has been done in many organizations especially in the western world in order to improve the organizational performance [6].

Enterprise Service Bus
Service Oriented Architecture SOA is a software integration solution for most of the systems.It is a looselycoupled architecture designed to meet the business needs of the organization.SOA is defined as an approach used to fulfill the requirements of loosely coupled, standard-based distributed computing which is protocolindependent as well.Enterprise Service Bus (ESB) serves as an integration and communication backbone in SOA approach.ESB utilizes web services standards to support communication patterns over multiple transport protocols and is responsible for the control, flow, and translations of all messages between services using different messaging protocols.SOA is a flexible architecture in terms that larger applications are modularized into services to unify business processes [7].

Construction Principles for SOA
Architecture is basically a workflow framework including standards, processes and procedures for implementation and SOA is one of the widely used architecture in enterprises that can effectively handle the rapid changes in architecture.Load testing, performance testing, and security testing are mostly done for SOA based systems.Service level agreement SLA is an agreement between consumer and service provider that is used to verify the QoS of services [2].SOA allows business transactions among loosely connected service in heterogeneous environment.Flexibility and agility are the strengths of the architectural model provided by SOA to implement business process.Design principles of SOA are service contract, loose coupling, abstraction, reusability, autonomy, statelessness, discoverability and composition [8].

Factors to Be Considered to Implement SOA
Some researchers discuss the impacts of the SOA implementation in organizations and the factors causing the success or failure of SOA implementation.Many factors are considered as essential success factors for SOA implementation.Some of the factors suggested by different authors are; reusability, complexity, governance, lack of skills in developers, lack of expertise and possible business models, organizational strategy/structure/culture, granularity of services, integration of applications, network governance, agile development, stakeholder's participation, business leadership, security, web services standards, system potential and strategy for migration, risk assessment and complexity increment.Architects and SOA implementers must have to consider the essential factors for SOA implementation as per business domain [9].

Information Security
Information security challenges should be considered during SOA implementation.Some challenges such as loosely coupled services, service contract, abstraction, reusability, autonomy, statelessness, discoverability, and composition have been discussed in literature.Some of the controls for providing solutions for these challenge are; SOA information security governance, SOA information security management, SOA information security model, and Policy information security framework [8].

Limited Recourses of Small Devices
Mobile (a low band-width and low computational device) data streaming applications can face problems in SOA environment due to the difference of attributes of service provider and consumer.For example, service provider provides video stream at 150 MB/sec but the consumer speed is just 5 MB/sec.A generic framework prototype is presented for managing and disseminating streaming data within an SOA environment [10].

Rapid Change in Consumer Demands
As the enterprises approaches towards business globalization, the rapidly increasing consumer demands become a big challenge.Solution for this problem is the agility of business and IT.Integration of traditional and new IT systems is a major issuer so the integration of logistic information system is a crucial issue for modern business.
Logistic information system has several subsystems like purchasing, warehouse etc. and needs to contact with third parties like suppliers, customers etc.A general design based on SOA and ESB can be described for the integration of distributed logistic information systems [11].

Areas of SOA Application
Problems associated with the development of e-government in Southern African Development Community are analyzed and an SOA framework is proposed as a solution that can integrate back-end legacy systems and deploy services [12].E-banking can provide many benefits to customers, banks, enterprise and also offers green banking.SOA adoption can provide many benefits to e-banking like efficiency, agility, flexibility etc. [13].
Non-integrated nature of healthcare systems causes loss of tens of thousands of patients per year due to the medical errors.So there was a need to increase the success rate of SOA adaptation in healthcare systems.SOA implementation can extend the body of knowledge in healthcare organizations [14].An architectural baseline is proposed by Kim et al. to design and implement the SOA based Operation Support System model for telecommunication providers'.The model can be extended to other domains like diverse service provisioning [15].

Methodology/Modeling
In this research, we are going to suggest a workflow to an organization to help them out to integrate multiple software systems based on Service Oriented Architecture and will present the simulation of the suggested workflow.

Background Knowledge of Organization
A well-known and well managed organization is working in education sector and providing free education to needy children all over the country.The organization is non-profitable and running its setup based on the donations collecting from donors.

Basic School Information
Classification of the educational units in this organization is described in Table 1 below.

IT Landscape
School Management System (SMS) is the center point of their IT landscape, enabling them to input relevant school information and disseminate information to all stakeholders from decision makers at the HO/RO level to those who make and implement decisions at the AO and Principal level.Current system is represented by Figure 3(a) while required system should be interactive that is shown in Figure 3(b).
As till Dec 2014, the organization has already grown to 900 units with 160,000 students.Their growth pattern is displayed in Figure 4.

Scope of the Suggested Workflow
We shall cover the data synchronization task between two systems SMS and HRMIS for this organization in our suggested workflow.

Focus Areas of SMS
The main areas of the SMS and related sections are illustrated in Figure 5.

Purpose
Integration between HRMIS and SMS will be a two way process passing selected fields from SMS to HRMIS and vice versa at predefined intervals.

How Will It Be Done?
Web services will be designed for pushing information to HRMIS and for pulling information from HRMIS.This is the most secure manner of integration as no application will need to interact with the database directly.
Web service can also utilize the methods and functions already built in the system.This will also be a more flexible approach when more systems (such as CRM, GP) will require two way communications with SMS going forward.Both web services, will be registered on UDDI so that the web service can operate at all times after required authentication.Some important features of the web service are as follows: 1) Web Service will send and receive only those fields as defined by business users of SMS and HRMIS.Ideally, as the needs of business users evolve, an appointed system administrator should have the option to add more fields so that more information can be passed/retrieved vis-à-vis the web service.
2) For SMS specifically, the web service will always update existing school information for example staff strength and staff credentials and not create new school.The web service will be able to update selected fields, not delete any data point.
3) The web service will not be event based, rather it would be linked to predefined intervals.At specified time, web services will be called to read and write data.Hence all changes done to school data within the SMS over the period will get updated in HRMIS in bulk.
It is recommended that this practice should be done thrice a year i.e. end of April (when new schools are created), end of August (when school information like signage are likely to be finalized), end of November (when midterm results are finalized along with some minor changes in school information).
SMS will also need HR data to be updated at defined intervals.Most likely, this information should get updated twice a year one in end of May (when teachers, faculty have been assigned to schools) and once in November (in case there is any change in faculty information).

Workflow for the Data Synchronization Using Web Services
In this section, we will describe the main workflow of our suggested framework.

Workflow in YAWL
This workflow presents the entire data sync process between SMS and HRMIS system.Similar work flow can be created for the data sync process between SMS and GP, SMS and FMS, SMS and CRM (Figure 7).Data Sync Process for HRMIS System Schedule Integration Service that is running on the SMS system will invoke and send a request to Request To SMS to Pull Data task with the output variable RequestType = SMS.Request to SMS to Pull Data task takes the input of RequestType = SMS and calls the Authentication 1 task with 2 output variables which are Userid = smsuser and Password = sms123.This task will authenticate the requester and invokes the SMS Web Service with output variable authentic = true.SMS Web Service gives a flag of servicestart = true to Service Pulls the Data from SMS DB task.This task will getdata in string or json string format from sms database and senddata in string or json format to the Send Data to Requester 1 task.This task will pass the senddata string to Push Received Data in HRMIS task that will finally push data in HRMIS database.

Conclusions/Future Work
The dynamic behavior of the business processes can be well controlled by aligning the business processes with the web services using the service oriented architecture.SOA doesn't only allow business process reengineering in an efficient manner, but its loosely coupled nature also helps organizations to evaluate their process and to accommodate changes in process without affecting the entire architecture.Most of the organizations are getting benefit of the SOA by mapping their business processes to web services and by using a middle ware in the form of Enterprise Service Bus to control traffic (requests) to web services to serve the required purpose.In this research, we are focusing on an organization of education sector and suggesting a workflow to them for the mapping of their business processes to web services.In this workflow, we suggested a web services-based solution to them.We performed the simulation of the suggested workflow using YAWL (Yet Another Workflow Language).We gave the complete specification of the suggested workflow in XML format as well.This XML based workflow describes the data flow in this workflow.No one presents this type of workflow for the requirement of the information synchronization in multiple systems.We are the first, proposing this solution and this is an easiest and cheapest solution for the automated information synchronization among multiple systems.
In next phase, we will present a workflow for the dynamic service replacement in SOA.

Figure 5 .
Figure 5. Main areas of SMS.
[2] service description language is an XML file used to define what service is and how to interact with it[2]?UDDI: Universal Description, Discovery and Integration.It is used to register web services.
Figure 1.Framework of SOA.Some web services standards discussed in different research are; WSDL, SOAP, UDDI, ESB, and BPEL.WSDL:

Table 1 .
Classification of the educational units.