Top PDF Application Web Services and Event / Messaging Systems

Application Web Services and Event / Messaging Systems

Application Web Services and Event / Messaging Systems

Application level Quality of Service – give audio highest priority Tunnel through firewalls Filter messages to slow collaborative or real time clients Hardware multicast is erratically i[r]

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Cyberinfrastructure and Web 2 0

Cyberinfrastructure and Web 2 0

The well-known Google Maps application serves as an illustration of many of the principles of rich Internet applications. The Google Maps API provides a high level, object oriented JavaScript library for building interactive maps. These libraries include convenient XML parsers, object representations of maps and overlays, access to additional services such as geo-location services, and other useful utilities. Map images are returned to the user’s browser as tiles fetched from Google Map servers. Unlike older Web map applications, this map fetching is done without direct action by the user (i.e. pushing an “Update Map” button). Rather, new map tiles are returned based on the user’s normal interactions with the system: panning to new areas creates events that result in new map downloads. Google Maps thus illustrates both REST style interfaces (the maps are retrieved using HTTP GET) and rich user interfaces (AJAX/JSON style JavaScript libraries that encapsulate server callbacks). The API also supports simple message formats, as developers can load and parse their own XML data for display on the maps. For a more thorough analysis of the server side of Google maps and how to build a custom tile server, see 22.
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Messaging in Web Service Grid with Applications to Geographical Information Systems

Messaging in Web Service Grid with Applications to Geographical Information Systems

As we discuss in this article, all communications in SOA-based systems are messages. Further, a powerful way to implement these systems is to place the service “islands” on a software-level messaging substrate that implements efficient routing, security, reliability and other qualities of service. As we will show, such systems support messages of all types, from infrequent update notification events to continuous streams. We suggest that in the complex evolving technology scene today, not only services but their collection into systems of higher functionality should be as decoupled as possible in architecture and tight timing constraints. This we call the principle of building “Grids of Grids of Simple Services” Many important Grid applications in real-time data mining involve all of these message types. We discuss a GIS (Geographical Information System) example from our SERVOGrid (Solid earth Research Virtual Observatory) work that uses the NaradaBrokering messaging system for managing data streams from GPS stations. We are in the process of connecting these to RDAHMM, a time series data analysis program useful for mode change detection. These streaming services form one sub-Grid in the “Grid of Grids” system supporting solid earth science and also containing (sub)-Grids involving code execution services and information/metadata services.
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Review of Literature on Web Services Security Architecture extended to Cloud, Big Data and IOT

Review of Literature on Web Services Security Architecture extended to Cloud, Big Data and IOT

Secure Service Rating in Federated Software Systems based on SOA, The Service oriented architecture (SOA) paradigm mostly provides a suitable approach as to meet the requirements of flexible distributed software systems. Referring to the activities for the standardization of web service semantics or alternatively the introduction of intelligent search mechanisms future software architectures are supposed to integrate software components as remote services of foreign providers. If the authors assume that such services can be standardized. Example as components of standard business application systems, the vision of a services economy arises where services of the sane type can be marketed by different providers. A service consumer on the other hand could choose the service he likes best at run time. However this vision is clouded by a multiplicity of risks which meet each other in the question of the specific reliability and trust worthiness of service providers in a certain context. Previous research activities picked up these problems where by a lot of promising approaches and frameworks have been developed which concern the negotiation of trust within open network architectures like grids are peer to peer networks. Nevertheless, the genesis of the reuse relationships between two network nodes had been neglected. Presents an approach for the establishment of reputation in federated software systems, where central network instances for the management of evaluations are avoided. Approach the service providers are responsible for this task on their own. The author presents a novel security protocol for the message based exchange of service evaluations that filters service providers from manipulating their own ratings [Nico Brehm].
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Web services oriented architecture for dynamic evolution of 
		communication with embedded systems

Web services oriented architecture for dynamic evolution of communication with embedded systems

Nikolay Kakanakov [13] mainly discussed the possibility of adaption of WEB service architecture (WSA) for implementing distributed embedded systems. The WSA integrates the best aspects of component-based development and World Wide Web. According to R. Pallavi [14] a service is: “a software system identified by a URI, whose public interfaces and bindings are defined and described using XML. Its definition can be discovered by other software systems. These systems may then interact with the WEB services in a manner prescribed by its definition, using XML based messages conveyed by Internet protocols.” Applications access WEB services via common WEB protocols and data formats. The most common used protocol for transferring data in the Internet is HTTP (Hypertext Transfer Protocol) and it is the key transport protocol in the WSA. The universal schema in the Internet is the one that codes the data is XML (Extensible Mark-up Language). The current structure of Internet is based on program-to-user interaction and the WSA is based on program-to-program interaction [15]. The WSA is based on some key standards: XML for data representation; SOAP for accessing services; WSDL for describing services; UDDI - registering and discovery of services.
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SOAP_3.ppt

SOAP_3.ppt

• SOAP is the standard messaging protocol used by Web services, an XML-based communication protocol for exchanging messages between computers regardless of their operating systems, programming environment or object model framework.

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Algorithms and the Grid

Algorithms and the Grid

In fact Grid messaging is more naturally related to message oriented middleware (MOM) [Bernstein1996] [MOM] and software overlay networks [Doval2003] than to MPI or PVM style messaging. The rich MOM infrastructure support messages that are self-describing and as well capture semantic intent. Depending on the application these messages can be made to encapsulate system conditions, method invocations, resource sharing, data interchange among others. Messages may also describe their correlation, dependency and causal relationships to other messages. The SOAP messaging used by Web Services illustrates this richer structure with a body containing the “real message” and separate headers corresponding to systems services including security, notification, virtualized addressing, fault tolerance, notification and special operations and relationship to resources. Processing this additional information typically takes a millisecond or so and adds significant functionality at insignificant fractional cost. In designing systems and algorithms for distributed systems it is important to understand this additional functionality and incorporate it into your architecture. Another difference between SOAP and MPI is that MPI only specifies interface and so interoperability between different MPI implementations requires additional work [IMPI]. SOAP however specifies both interfaces and message structure so broad interoperability can be achieved. This is a achieved at a performance cost that we return to in Sec 6.5.
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An evaluation of four patterns of interaction for integrating disparate ESBs effectively and easily

An evaluation of four patterns of interaction for integrating disparate ESBs effectively and easily

Organisations use Enterprise Service Busses (ESBs) to support enterprise application integration. For a variety of reasons – mergers and acquisitions, geographically distributed enterprise units, distributed governance, scalability – enterprises sometimes need to acquire multiple, disparate ESBs and enable the applications that each one supports to interoperate. However, currently, no standard architecture exists for integrating multiple, disparate ESBs. To begin to address this problem, four candidate disparate ESB integration patterns – directly connected, web services, homogeneous messaging middleware, and message bridge – were identified from the enterprise application integration literature and tested for their effectiveness in integrating multiple, disparate ESBs. Each pattern was applied in two different scenarios: loan broker request, and inter-divisional messaging. In each scenario a number of enterprise applications were integrated using three disparate ESBs: Oracle Service Bus, Apache ServiceMix, and Mule ESB. The experiments were designed to test how well the different patterns supported effective integration of different ESBs. The results indicate that the web services and homogeneous messaging middleware patterns are the best for integrating disparate EBS effectively and with minimal difficulty. In addition, it was discovered that the degree to which ESB integration could be achieved depended upon the number of ESBs being integrated, the relevant skills of the integration team, and the types of the ESBs. The results may be of practical benefit to the communities engaged in enterprise application integration research and practice.
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A Framework to assess the value of web services

A Framework to assess the value of web services

Data System Management Integration frameworks Application Development & Response Time Deployment Service Leveraging Web Services aggregation existing management within Legacy systems ent[r]

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A Distributed Content-Based Search Engine Based on Mobile Code and Web Service Technology

A Distributed Content-Based Search Engine Based on Mobile Code and Web Service Technology

6. Related Work. Considerable work is done in the general area of CBR, see e.g., [27] for the proceedings of a recent conference. Well received work by several authors reports on CBR systems for the World Wide Web [45, 44, 5]. All these image search engines are based on the client/server paradigm of collecting images from the Web. Mobile agent technology is complementary to this work. It remains to be investigated how well the algorithms developed by the authors mentioned above can be adapted to be used within a mobile agent framework. The idea of using mobile agents for content based image retrieval has been mentioned before [39, 2, 54]. Mobile agents have also been applied in related applications. For instance, in [25], Johansen reports on the use of mobile agents in the context of a weather information system (mobile agents process and deduce weather information from satellite imagery). Early attempts to integrate static agents and Web services have been described in [31, 55, 8]. More sophisticated solutions, especially in the context of FIPA-compliant agent platforms, have been presented in [29, 14, 46, 20]. In contrast, the existing contributions based on mobile agents have more diverse goals, and thereby do not completely follow transparent integration of agents and Web services [9, 30, 35, 13, 24].
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Exposing application components as web services

Exposing application components as web services

This paper explores technology permitting arbitrary application components to be ex- posed for remote access from other software. Using this, the application and its constitu- ent components can be written without concern for its distribution. Software running in different address spaces, on different machines, can perform operations on the remotely accessible components. This is of utility in the creation of distributed applications and in permitting tools such as debuggers, component browsers, observers or remote probes ac- cess to application components. Current middleware systems do not allow arbitrary expo- sure of application components: instead, the programmer is forced to decide statically which classes of component will support remote accessibility. In the work described here, arbitrary components of any class can be dynamically exposed via Web Services. Tradi- tional Web Services are extended with a remote reference scheme. This extension permits application components to be invoked using either the traditional pass-by-value semantics supported by Web Services or pass-by-reference semantics. The latter permits the preser- vation of local call semantics across address space boundaries.
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SCALABLE, FAULT TOLERANT MANAGEMENT OF GRID SERVICES: APPLICATION TO MESSAGING MIDDLEWARE

SCALABLE, FAULT TOLERANT MANAGEMENT OF GRID SERVICES: APPLICATION TO MESSAGING MIDDLEWARE

A side-effect of the advancement was that different computing systems were introduced. Some were made too simple to carry out the duties they were supposed to perform while others were made too complex. The cost of building and maintaining them rocketed, not to mention the nearly impossible task of integrating different systems together. As more and more software systems are built, similar situations and patterns appear. Naturally, we want to reuse the functionality of existing systems rather than building them from scratch. This led to the idea of a Service Oriented Architecture (SOA) [1, 2], which is an architectural style for loosely coupling interacting software agents. A SOA provides an interoperable platform that helps maximize reusability of existing software resources. While it is clear that SOA and its current implementation, Web services [3], will have profound impact on the next generation of distributed systems, many aspects of this platform still require significant research and development.
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Grids for Real time and Streaming Applications

Grids for Real time and Streaming Applications

Grids are Services exchanging Messages Developing messaging paradigm for Grids using Message Oriented Middleware or Software Overlay Network or Grid Service Bus Web Service container rep[r]

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Access Control System Using Web Services for XML Messaging Systems

Access Control System Using Web Services for XML Messaging Systems

Information and content management systems require access controls to information content. In publish/subscribe style systems, for example, there will be various restrictions on access to both topics and particular privileges associated with that topic, or channel. We are particularly interested in access control systems that are associated with XML metadata systems. XML metadata is important for future Web service applications [1]. Open Grid Service Architecture (OGSA) [2] and Semantic Web [3] both depend on metadata [4]. We have examined the low-level requirements for managing the XML nuggets of such systems, which include the following: composing tools for creating valid, correct XML metadata nuggets; an architecture and implementation for delivering metadata in the form of messages to listeners who has access to use specific message channel; metadata browsers that can sort and display the nuggets by category; and user role/access control system to define user levels and privileges. The implementation of these ideas is discussed in Ref. [5]. Specific
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Wireless Reliable Messaging Protocol for Web Services (WS  WRM)

Wireless Reliable Messaging Protocol for Web Services (WS WRM)

By employing Web services technology, the Grid system is evolving to be more manageable service infrastructure, including lifetime management, discovery of characteristics, and notifications. Reliable messaging is one of the key issues addressed for quality of services in Web services. In this paper, we propose a reliable message scheme designed for mobile environments in the context of a Web services architecture; Web services —Wireless Reliable Messaging (WS-WRM). We also consider the federation issues with emerging specifications proposed by leading Web services standard groups. We eventually intend to extend the reliability to mobile end-nodes in a more efficient way. In this paper, we address the design issues and describe the detailed scheme of messaging architecture.
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NaradaBrokering Grid Messaging and Applications as Web Services

NaradaBrokering Grid Messaging and Applications as Web Services

In a Web Grid Service architecture, the state of any service is defined by its initial condition and all the messages including ordering that it receives This how shared event model of c[r]

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Message Exchange for Web Service Based Mapping Services

Message Exchange for Web Service Based Mapping Services

In addition, we plan to build new interconnection infrastructure for the message delivery between these GIS services, to eliminate the service dependence on HTTP for SOAP transport. We use NaradaBrokering as a message based middleware system between these components to deliver the request and response messages wrapped in SOAP envelope. NaradaBrokering is a distributed messaging infrastructure that provides a message oriented middleware which facilitates communications between the distributed entities through the exchange of messages. NaradaBrokering provides some features that are important in GIS area. These are Quality of Service (QoS) and security profiles for sent and received messages, interface with reliable storage for persistent events, reliable delivery via WS-Reliable messaging, fault tolerant data transport, support for different underlying transport implementations such as TCP, UDP, Multicast, SSL, RTP, HTTP, discovery service to find nearest brokers / resources (efficient routing).
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Reliable Messaging for Grids and Web Services

Reliable Messaging for Grids and Web Services

1 Point-to-point generic linkage of services using WSRM with messages saved in databases as required in specification 2 Scalable Management Architecture to support dynamic robust collect[r]

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Web Application Attacks Detection: A Survey and Classification

Web Application Attacks Detection: A Survey and Classification

The Insufficient Transport Layer Protection vulnerability is due to the fact that Web applications do not protect or poorly protected the network traffic. SSL/TSL has been used by web application only during the authentication phase. data and session IDs are in clear-text in application network flows. Expired certificates or misconfigured can also be the cause of this type of vulnerability. Improper configuration of SSL can facilitate such attacks "phishing" type "man in the middle", etc… An attacker can:
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Presentation

Presentation

Collaborative Replicated Web Services II The event service now replicates the messages INPUT to the master web service In Collaborative Web Service Access we replicated messages OUTPUT t[r]

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