This chapter discusses services in the context of service-oriented architecture (SOA). It defines a service as a self-contained business function that accepts requests and returns responses through a standard interface. A service should represent discrete units of work from a business perspective rather than being technically driven. The interface of a service, including message signatures and semantics, is considered its contract. Additional common attributes of services discussed include being stateless, reusable, and having quality of service guarantees.
Service Oriented Architecture.
SOA is a style of architecting applications in such a way that they are composed of discrete software agents that have simple, well defined interfaces and are orchestrated through a loose coupling to perform a required function.
Service Oriented Architecture.
SOA is a style of architecting applications in such a way that they are composed of discrete software agents that have simple, well defined interfaces and are orchestrated through a loose coupling to perform a required function.
A service-oriented architecture (SOA) is an architectural pattern in computer software design in which application components provide services to other components via a communications protocol, typically over a network. The principles of service-orientation are independent of any vendor, product or technology.
03 Service Oriented Architecture Series - Basic SOA ArchitecturePouria Ghatrenabi
Service Oriented Architecture (SOA) is the secret sauce of many software integration and internet technologies. The SOA Series includes five presentations based on IBM SOA Associate Certificate. It gives a very concise, practical overview of SOA concepts. The third presentation discusses the characteristics of a basic SOA architecture, IBM SOA Reference Architecture, enterprise service bus (ESB), role of Web Services and messaging, and the the stages of the SOA lifecycle
Service Oriented Architecture and Business Process Modeling OverviewJean Ferguson
Overview of Service Oriented Architecture and Business Process Modeling as it applies to the Open Library Environment Project as presented at the Regional Design Workshops.
Enterprise Architecture, SOA, and their relationships
Apply SOA to Enterprise Architecture – Service Oriented Enterprise Architecture
Service Oriented Enterprise
Service Oriented Applications and Systems
Service Oriented Infrastructure
A service-oriented architecture (SOA) is an architectural pattern in computer software design in which application components provide services to other components via a communications protocol, typically over a network. The principles of service-orientation are independent of any vendor, product or technology.
03 Service Oriented Architecture Series - Basic SOA ArchitecturePouria Ghatrenabi
Service Oriented Architecture (SOA) is the secret sauce of many software integration and internet technologies. The SOA Series includes five presentations based on IBM SOA Associate Certificate. It gives a very concise, practical overview of SOA concepts. The third presentation discusses the characteristics of a basic SOA architecture, IBM SOA Reference Architecture, enterprise service bus (ESB), role of Web Services and messaging, and the the stages of the SOA lifecycle
Service Oriented Architecture and Business Process Modeling OverviewJean Ferguson
Overview of Service Oriented Architecture and Business Process Modeling as it applies to the Open Library Environment Project as presented at the Regional Design Workshops.
Enterprise Architecture, SOA, and their relationships
Apply SOA to Enterprise Architecture – Service Oriented Enterprise Architecture
Service Oriented Enterprise
Service Oriented Applications and Systems
Service Oriented Infrastructure
Study on Use Case Model for Service Oriented Architecture Developmentijcnes
The recent trends in the computer industry are the one and only thing i.e., web services. Because of the common availability and open technologies web services are relevant to all. Service-oriented architecture (SOA) helps organizations to transform their business processes for high performance by simplifying the underlying information systems. The most challenging aspect of building successful software applications is clearly understanding and specifying the requirements that an application must satisfy. Use case modeling is an increasingly popular approach for identifying and defining requirements for software applications of all types. Use cases describe the behavior of the system as its users interact with it. This approach helps to place the software requirements in the framework of a user doing some useful work with the system. This type of approach helps to map software requirements to the relevant endures business processes, a very powerful concept. This paper presents how the relationship between use case model and Service oriented architecture.
Study on Use Case Model for Service Oriented Architecture Developmentijwtiir
The recent trends in the computer industry are the one
and only thing i.e., web services. Because of the common
availability and open technologies web services are relevant to
all. Service-oriented architecture (SOA) helps organizations to
transform their business processes for high performance by
simplifying the underlying information systems. The most
challenging aspect of building successful software applications is
clearly understanding and specifying the requirements that an
application must satisfy. Use case modeling is an increasingly
popular approach for identifying and defining requirements for
software applications of all types. Use cases describe the
behavior of the system as its users interact with it. This approach
helps to place the software requirements in the framework of a
user doing some useful work with the system. This type of
approach helps to map software requirements to the relevant enduser business processes, a very powerful concept. This paper
presents how the relationship between use case model and
Service oriented architecture.
Study on Use Case Model for Service Oriented Architecture Developmentijbuiiir1
The recent trends in the computer industry are the one and only thing i.e., web services. Because of the common availability and open technologies web services are relevant to all. Service-oriented architecture (SOA) helps organizations to transform their business processes for high performance by simplifying the underlying information systems. The most challenging aspect of building successful software applications is clearly understanding and specifying the requirements that an application must satisfy. Use case modeling is an increasingly popular approach for identifying and defining requirements for software applications of all types. Use cases describe the behavior of the system as its users interact with it. This approach helps to place the software requirements in the framework of a user doing some useful work with the system. This type of approach helps to map software requirements to the relevant enduser business processes, a very powerful concept. This paper presents how the relationship between use case model and Service oriented architecture
Service Oriented Software Engineering: Services as reusable components, Service Engineering, Software Development with Services. Service-oriented architectures, RESTful services
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Project - UG - BTech IT - Cluster based Approach for Service Discovery using ...Yogesh Santhan
Abstract— Web services that are appropriate to a user specific request are usually not considered in discovering the exact service since they are present without explicit related semantic descriptions. In our approach, we deal with the issue of service discovery provided non-explicit service description semantics that match a particular service request. We propose a system that involves semantic-based service categorization which is performed at the UDDI with a key for achieving the service categorization at functional level based on an ontology skeleton. Also, clustering is used for literally systemizing the web services based on functionality which is achieved by using analytic algorithm. An efficient matching for the relevant services is achieved by the enhancing the service request semantically and involves expanding the additional functionality (obtained from ontology) that are related for the requested service. The pattern recognition algorithm is used to select appropriate service from the cluster formation of related (grouped) web services.
This is my UG Final Year Project - BTech Information Technology.
Learning spark ch01 - Introduction to Data Analysis with Sparkphanleson
Learning spark ch01 - Introduction to Data Analysis with Spark
References to Spark Course
Course : Introduction to Big Data with Apache Spark : http://ouo.io/Mqc8L5
Course : Spark Fundamentals I : http://ouo.io/eiuoV
Course : Functional Programming Principles in Scala : http://ouo.io/rh4vv
HBase In Action - Chapter 04: HBase table designphanleson
HBase In Action - Chapter 04: HBase table design
Learning HBase, Real-time Access to Your Big Data, Data Manipulation at Scale, Big Data, Text Mining, HBase, Deploying HBase
HBase In Action - Chapter 10 - Operationsphanleson
HBase In Action - Chapter 10: Operations
Learning HBase, Real-time Access to Your Big Data, Data Manipulation at Scale, Big Data, Text Mining, HBase, Deploying HBase
Hbase in action - Chapter 09: Deploying HBasephanleson
Hbase in action - Chapter 09: Deploying HBase
Learning HBase, Real-time Access to Your Big Data, Data Manipulation at Scale, Big Data, Text Mining, HBase, Deploying HBase
Learning spark ch04 - Working with Key/Value Pairsphanleson
Learning spark ch04 - Working with Key/Value Pairs
Course : Introduction to Big Data with Apache Spark : http://ouo.io/Mqc8L5
Course : Spark Fundamentals I : http://ouo.io/eiuoV
Course : Functional Programming Principles in Scala : http://ouo.io/rh4vv
Learning spark ch01 - Introduction to Data Analysis with Sparkphanleson
Learning spark ch01 - Introduction to Data Analysis with Spark
References to Spark Course
Course : Introduction to Big Data with Apache Spark : http://ouo.io/Mqc8L5
Course : Spark Fundamentals I : http://ouo.io/eiuoV
Course : Functional Programming Principles in Scala : http://ouo.io/rh4vv
1. Book Author: Nicolai M. Josuttis
Chapter Three: Services
IT-Slideshares http://it-slideshares.blogspot.com/
2. 3.1 Services (in SOA) definition
A "Service" is (ideally) a self-contained, stateless
business function that accepts one or more requests
and returns one or more responses through a well-
defined, standard interface. Services can also perform
discrete units of work such as editing and processing a
transaction. Services should not depend on the state of
other functions or processes. The technology used to
provide the service, such as a programming
language, does not form part of this definition.
3. 3.1.1 Services Represent Business
Functionality
Technically Driven Business Interface
customerOP(action, // "create", "read", "change", "delete"
id, // customer id or null
name, // new customer name or null
address, // new customer address or null
account) // new customer bank account or null
It is a business interface because it allows you to create a new customer, read or modify his/her data, or delete that data. However, this
interface is technically driven, probably by a direct mapping to a corresponding database interface.
In contrast, a business-driven interface might look like this:
createCustomer(name, address, account)
readCustomer(id)
changeCustomerAccount(id, account)
changeCustomerAddress(id, address, check, modify)
deleteCustomer(id) // customer id
Note the following differences:
Instead of having one signature, you have five. Each operation's name describes the basic functionality from a business point of view. In
addition, there are no parameters that do not make sense for each particular functionality (for example, for the deletion of a customer, you
only need the customer ID).
Operations for reading and writing have different levels of granularity. In this case, you have the ability to change a customer's address or
bank account independently, but when you read customer data, you get both. Such differences are typical for business processes.
Specific operations might have additional parameters. In this case, the operation for changing an address has additional attributes that
specify whether an address check should be performed and whether the address might even be modified according to the address check
(e.g., replacing "NewYork" with "New York").
In fact, if you let business people design interfaces on a case-by-case basis, they'll look different from interfaces driven, for example, by the
underlying database design. Service orientation clearly prefers business-driven over technically driven interfaces, although this does not
mean that you should not think about possible synergy effects. Start the design based on the requirements, not based on the implementation.
4. 3.2 Interfaces and Contracts
A service is an interface for (multiple) messages that return
information and/or change the state of an associated entity
(backend).
SOA could be better named “Interface-oriented
architecture”.
Interface should be well-defined
Signature (input, output, possible exception)
Contracts and QoS are non-functional commitments
Message exchange patterns (MEPs)
Notification/Escalation in change of States
Peak hours handling
5. 3.3 Additional Service Attributes
Attributes that “may”, “should”, “must” have
Self-Contained Services (independent, autonomous) but still have some dependecies
Coarse-grained services balance between dependencies and performance (OASIS SOA Reference
Model) – by building abstraction layer < slower runtime.
Visible/Discoverable (where services are hosted)
Stateless (where/how long the business states exists ? Is it technical or business )
Idempotent (ability to redo or resend messages when in doubt of states)
Reusable (performance vs. reusing same service – bottlenecks)
Composable (use/call other services) leads to BPModeling
Technical services (autonomous, QoS-enabled, vendor diverse, interoperability, discoverable, and
potential reusable services, implemented as web services)
QoS and SLA-Capable (service contract runtime performance, reliability…etc)
Pre- and Post-Conditions (specify the semantic behavior of services – designed by contract)
Vendor-Diverse – large distributed systems many vendors to provide platforms, middlewares …
Interoperable (see def) – core requirement for SOA
Implemented as Web Services
Web Services might be an (obvious) way to implement SOA, but SOA as a concept is not tied to any
specific technology.
6. 3.3.1 Self-contained Services Def.
A "Service" has a definition. This definition consists of:
An explicit and detailed narrative definition supported by a low
(but not detailed [not implementation specific]) level process
model.
A set of performance indicators that address measures/performance
parameters such as availability (when should members of the
organization be able to perform the function), duration (how long
should it take to perform the function), rate (how often will the
function be performed over a period of time), etc.
A linkage to the organization's information model showing what
information the "Service" owns (creates, updates, and deletes) and
which information it references and is owned by other "Services."
A listing of known downstream consumers (other "Services" that
depend upon its function or information) and the documentation
of their requirements.
7. 3.3.2 Coarse-Grained Services
The noun "service" is defined in dictionaries as "The performance of work (a
function) by one for another." However, service, as the term is generally
understood, also combines the following related ideas:
The capability to perform work for another
The specification of the work offered for another
The offer to perform work for another
These concepts emphasize a distinction between a capability and the ability to
bring that capability to bear. While both needs and capabilities exist
independently of SOA, in SOA, services are the mechanism by which needs
and capabilities are brought together.
...
The consequence of invoking a service is a realization of one or more real world
effects. These effects may include:
information returned in response to a request for that information,
a change to the shared state of defined entities, or
some combination of (1) and (2).
8. 3.3.12 Interoperable
From a business perspective, services are IT assets that
correspond to real-world business activities or
recognizable business functions and that can be
accessed according to the service policies that have
been established for the services.
...
From a technical perspective, services are coarse-
grained, reusable IT assets that have well-defined
interfaces (a.k.a. service contracts) that clearly
separate the services' externally accessible interface
from the services' technical implementation.
9. 3.4 Summary
Here is my summarizing definition of "service" in the context of SOA:
A service is the IT realization of some self-contained business functionality.
By focusing on the business aspects, a service hides technical details and allows business
people to deal with it.
Technically, a service is an interface for (multiple) messages that are exchanged between
provider(s) and consumer(s).
The complete description of a service from a consumer's point of view (signature and
semantics) is called a "well-defined interface" or "contract." A contract is agreed
individually between a certain provider, and a certain consumer, and usually includes
nonfunctional aspects such as SLAs.
There are several attributes that services may (or, according to some definitions, must)
have. According to my understanding, they are situation-dependent; services will almost
always have different attributes, and should be classified according to those attributes.
IT-Slideshares http://it-slideshares.blogspot.com/