jgroup
jgroup is based on the java distributed object model and is implemented entirely in java .
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download jgroup / arm 3. 0. 1 with jini extensions (4. 4mb )
digital venture, part of jgroup, has gained exclusivity rights to represent global mobile platform airpush .
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i wish you have caught the general design concepts of jgroup with above description. now let' s get into the code :
digital venture is the digital arm of jgroup and the exclusive representative of airpush in 20 countries. its mission is to rede ne advertising in the mea region by supplying performance - advertising solutions to advertisers .
jgroup is an integration of group technology with distributed objects. jgroup supports a programming paradigm called object groups that enables development of reliable and highly - available services based on replication. clients interact with an object group implementing some distributed service through an external group method invocation (egmi) facility. jgroup hides the fact that services may be implemented as object groups rather than single objects so that clients using them through egmi need not be reprogrammed. servers making up the group object, on the other hand, coordinate their actions so as to achieve global consistency of the state distributed among them through an internal group method invocation (igmi) facility. strong guarantees provided by jgroup for both egmi and igmi in the presence of failures and recoveries (including partitioning and merging of the communication network) greatly simplify the task of application developers .
in above is some simple design concepts on how to build a reliable transmission system on top of ip multicasting + udp. jgroup is certainly much more complex than above example but the design concept is basically the same .
in jgroup, the minimal group unit is called' channel'. members in a channel can talk with each other. the data send / receive in a channel is called' message'. here is the use case :
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jgroup has been heavily influenced by our previous work on partitionable group communication formulated in terms of processes interacting through multicast messages. in particular, the properties guaranteed for igmi closely resemble what is known as view synchrony semantics for group communication. one of the innovations of jgroup is the integration of egmi semantics with those of igmi without requiring clients to become full fledged members of the server object group. this is a fundamental requirement for scalability since the number of potential clients of a service may be extremely large while a modest number of replicas is typically sufficient to achieve the desired levels of reliability and availability for the server object group. yet another novelty of jgroup rests in the fact that a single paradigm - - - group method invocation - - - governs both client - to - server and server - to - server interactions .
in 2006, jgroup set up promomedia and built it into the leading provider of billboards and outdoor advertising in the region. it now offers advertisers over 3, 500 spaces in prime locations across lebanon, iraq, palestine, jordan, afghanistan, nigeria, egypt, uk, turkey, and uae .
jgroup is the corner stone for clustering. it is a reliable multicast system. as we know, using ip multicasting we can set a group of computers to use one multicast ip address, and all the messages sent to this multicast ip address will be received by all the computers in the group .
jgroup setup the hugely successful hawacom tv. hawacom is the leading pan - arab tv station for music clips and entertainment programs. it’s largely influential in breaking new music and setting the cultural agenda. hawacom stresses on highlighting the latest introductions in the music industry to cater to all tastes of its target audience .
in jgroup a cluster is called a channel. the members in the channel can send messages to or receive messages from this channel. we will develop an example that creates a channel and have two members in it: a sender that sends messages to the channel and a receiver that receive messages from the channel .
jgroup is a regional group founded and headed by imad jomaa. it incorporates 34 companies located throughout the middle east, united kingdom, and the united states. aiming at encompassing diverse business fields, the group’s business scope involves media, publishing, advertising, production, printing, sports, real estate construction and development, health and beauty .
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most object group systems, including jgroup, do not include mechanisms for distributing replicas to hosts or for recovering from replica failures. yet, these mechanisms are essential for satisfying application dependability requirements such as maintaining a fixed redundancy level. arm is a replication management facility we have built on top of jgroup to simplify implementation of application - specific replication policies. a replication policy describe the quality of service mechanisms used by an application group, such as replication style and recovery strategy. arm provides a simple interface through which a management client can install and remove object groups within the distributed system. after its installation, an object group becomes an autonomous entity requiring no user interaction, unless manual removal of the group is desired. in other words, arm handles both replica distribution, according to an extensible distribution scheme, as well as replica recovery, based on a group - specific policy. this allows the creation of object groups with varying dependability requirements and recovery needs. arm includes a correlation mechanism to collect and interpret failure notifications from the underlying group communication system. this information is used to trigger group - specific recovery actions in order to reestablish system dependability properties after failures. the properties of our framework as described above lead to what we call autonomous replication management .
generally speaking, jgroup is designed as a' layered protocol stack'. in the bottom of the stack it' s the' udp' protocol. other protocols are built on top of it to meet different requirements of a cluster. for example, some protocol ensures the packet reliability (like the example shown above: all the packets should be sent to the members in cluster with 0% data loss); some protocol will check the liveness of the members in a cluster (for example, ping the members periodically); and some protocol will cut the big datagram into smaller one for udp to be able to transmit them (as we know, the udp packet is sensitive to the size of datagram) .
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hawacom tv now on air. new music channel by jomaa group and al jadeed
“i’m really focused on wpp more than i am on what martin is doing. ”
airpush’s mobile platform utilizes advanced targeting technologies, including geo - fencing, persona targeting, app inclusion targeting and a / b testing to match advertisers with the right audience. airpush also offers proprietary performance ad units, including advanced abstract banners, which are believed to perform better than other standardized mobile ad units. this granular level of targeting combined with limitless creative capabilities is the first of its kind in the middle east & africa, says the company .
while traditionally mobile advertising is sold on a cost per mille (cpm) basis, which relies on mass exposure and can result in minimal engagement, airpush and digital venture claim to guarantee high - level and high - quality engagement for brands .
established in late 2010, airpush was recently named top innovator in advertising data at the 2014 dataweek conference, company of the year at the 2014 international best in biz awards and ranks second on forbes’ list of america’s most promising companies in 2014 .
a battle between wpp and sir martin sorrell’s new agency, s4, to acquire dutch digital production company ...
yesterday, we announced the news of mindshare winning the media business of pizza hut, which is ...
mindshare mena, part of groupm, has won the pizza hut account. the account was previously handled ...
tbwa has partnered with facebook for a custom training program that will be rolled out across ...
dentsu aegis network (dan) is expanding its mena footprint with the launch of merkle, a technology - enabled, ...
j. walter thompson saudi arabia has retained the consumer business unit (cbu) account for saudi telecom ...
following last year’s controversy that saw patou nuyteman replaces edmond moutran as memac ogilvy’s ceo, the agency ...
previously known as ogilvy & mather, ogilvy has restructured its operations under a new brand identity. founded as ...
rapp middle east, part of the omnicom network, has just concluded an extensive pitch process bagging ...
socially - led creative agency network we are social, has acquired a majority stake in socialize, the middle ...
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sports ville is a sports academy established in 2010. the wide sports complex consists of a number of football pitches, basketball, handball and badminton courts for all age groups offering them the perfect place and space to practice and nurture their talents .
the company also offers entertainment options through providing sports facilities and entertainments programs such as organizing birthdays, summer camps, and street ball events .
urltoken is a leading luxury real estate website that features day to day news, reports, features, and articles about the local, regional, and international real estate sector .
the website features sector related articles and reports from ekaruna luxury real estate magazine, a leading bi - monthly publication developed and published by promoprints sal, and distributed in lebanon and the levant region .
the user - friendly search engine offers web surfers easy access to listed developments, lands, and locations. individuals can sign up to the website and receive the up - to - date information on the latest projects, developments, as well as news and events .
providing the readers with an in - depth view on various topics related to the sector, the interview section features prominent figures such as real estate developers, contractors, agents, as well as analysts who give their input on diverse issues .
analytical reports on the local, regional and international real estate markets offer a rich analysis on the current status of these markets through statistical facts and figures, highlighting the points of strengths and weaknesses, offering solutions, and pointing out new opportunities .
ekaruna' s news page lists the latest business developments in progress worldwide, giving an all encompassing overview on the sector from a global perspective .
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to enhance people' s life by providing rewarding investments, paving the way to long term returns, and shaping up first - class living standards .
to be a leader in the real estate development industry, offering our niche clients with upscale products that compliment their innovative luxury standards while guaranteeing excellent return on investment .
promoproperties established in 2011 is a real estate agent and development company which sells existing real estate projects in lebanon, uae, uk, and the united states .
its vision is to enhance people’s life by providing rewarding investments, paving the way to long term returns, and shaping up first - class living standards .
jawharat beirut was established for the import, distribution and marketing of fmcg (fast moving consumer goods) across baghdad and nigeria .
the company' s strategic approach lies behind understanding the market dynamics and introducing new products such as olfa; canned and frozen fish .
al badeel al iraqiya a manufacturer of commercially prepared intravenous iv solutions distributed across iraq .
the campaign maintains an extensive supply chain network to support customers and distributors, and to ensure patients can receive the therapy they need .
al badeel al iraqiya aims to provide high quality and reliable products to the healthcare fraternity .
jcc is a leading contracting company specialized in all aspects of signs from building signage and vehicle graphics to commercial & retail signage, led lighting, industrial signage and large scale digital printing .
established in 2008, jcc’s field of expertise includes below the line production, branding and steel work .
al bekaa lel moukawalat is a real estate contracting and consultancy firm. its field of expertise includes earthworks, site grading, road works, infrastructure works, general civil contracting, concrete steel structures and foundations .
al bekaa lel moukawalat seeks to position itself as the most efficient and effective real estate contracting company with an outreach to the arab region .
alwan loubnan is the largest copy center chain with strategic locations across baghdad, iraq .
alwan loubnan offers a complete line of copy and computer services from a simple photocopy to huge poster plotting and other services .
promoprints is a leading publishing house with a portfolio of multi - platform publications including u magazine lebanon, ekaruna luxury real estate magazine and the gate magazine .
u magazine lebanon the number one women fashion magazine, your go - guide for fashion, jewelry, beauty, health and society. ekaruna magazine, a real estate magazine covering the lebanese and markets the mena region markets. it provides latest market news and analyses, and investment guides. the gate magazine, a socio - academic publication targeting university students all across lebanon .
promedica is a leading distributor of pharmaceutical and cosmetic brands. it offers a line of products that meets almost all health and beauty needs such as juventus, revitalash mascara, nouriche, revitahair, and revitabrow .
the company aims at providing high quality products that insure customers’ satisfaction, and distinguishing the products in the market over other competitor brands .
promomedia is also consistently on the cutting edge of outdoor advertising technology by continually innovating the products it offers with a dedicated team of specialists. promomedia offers led, scrollers, unipoles, rooftop boards, wall signs and backlit panels on highways across the iraq and the levant. it recently boosted its portfolio by offering full - motion advertising to provide clients with the most eye - catching promotions possible .
al media is a leading tv representative established in 2004. its portfolio includes al jadeed, one of the country’s leading tv stations and hawacom, a popular music channel across the arab world. since then, al media has expanded its portfolio to manage ad sales for a number of tv stations across the mena region including al iraqiya, al iraqiya sports and al iraqiya news. in less than a decade, al media succeeded in significantly boosting the ad sale revenues of represented media while creating increased value for advertisers .
promofix, is a leading media representative specialized in digital media, radios, and publications. established in 2005, promofix has since then expanded and built its core business around the media industry .
promofix offers online and offline media advertising sales, being the exclusive representative of: aljadeed tv website, aljadeed fan, aljadeed sport, hawacom tv website, hawacom fm, mulhak. com, waradana. com, ekaruna. com, airpush mobile advertising, u magazine lebanon, ekaruna luxury real estate magazine, the gate magazine, forbes middle east magazine, mea in - flight advertising and more .
ssho provides media and advertising services across all platforms – television, radio, out of home and digital advertising – for its clients in libya. ssho is also the exclusive media representative for libyan airlines in - flight magazine “in - flight. ”
ssho owns kazmiye park, a most enjoyable amusement park located in the centre of baghdad .
airpush’s mobile platform utilizes the latest in cutting edge targeting technologies. it also o ers proprietary performance ad units, including the advanced abstract banners, consistently delivering dramatically higher performance than other standardized mobile ad units. this granular level of targeting combined with limitless creative capabilities is the fi rst of its kind in the world .
shazam is a mobile app that recognizes music and tv around you. it is the best way to discover, explore and share the music and tv you love. shazam connects more than 500 million people. the app, available now in the apple, android and windows stores. and always looking for new and innovative ways to delight the users .
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jgroups is a toolkit for reliable messaging. it can be used to create clusters whose nodes can send messages to each other. the main features include
the most powerful feature of jgroups is its flexible protocol stack, which allows developers to adapt it to exactly match their application requirements and network characteristics .
the benefit of this is that you only pay for what you use. by mixing and matching protocols, various differing application requirements can be satisfied .
jgroups allows developers to create reliable messaging (one - to - one or one - to - many) applications where reliability is a deployment issue, and does not have to be implemented by the application developer. this saves application developers significant amounts of time, and allows for the application to be deployed in different environments, without having to change code .
this website was generated from xml using velocity and the excellent jakarta - site2 projects .
ip multicasting is usually used together with udp protocol. because udp protocol is stateless, if one computer send an udp datagram to one multicast ip address, this udp datagram will be sent to all the members in the group. meanwhile, the sender of this udp datagram don' t care whether destination computers received this datagram or not. here is the diagram that shows a ip multicasting group that contains three members :
udp is suitable for this scenario. because if we use tcp, then the sender must establish connections with all the members in a multicasting group, and check the messages are received successfully by all the members .
so if we want to build a reliable cluster system based on ip multicast + udp, we need to ensure the data stability by ourselves .
one example is like numbering all the datagrams we' ve sent in application layer. and the receiver will need to check the data is not lost and then sort the packets into correct order. for example :
if sender sent packet 1, 2 to multicast group, and in this group there are two receivers called a and b. receivera received packet 1, 2 successfully, but receiver b only get packet 1. then receiverb will ask sender to retransmit packet2. please note this time the sender don' t have to send packet 1 to multicast address, because other receivers in the group didn' t ask for it because they have gotten the packet 2 successfully. sender just need to send packet 1 to receiverb again with an unicast to reduce bandwidth cost :
if sender sent packet 1, packet 2, and receivera received packet 2, packet 1, it will reorder the packet to packet 1, packet 2 by itself .
you can even guess some protocol' s purpose by its name. the complete description of each protocol could be found here :
please note a member in a channel can be both a sender a receiver. we just simplify the scenario in the example for the code to be better explained. here is the use case :
from the above diagram we can see the first step to setup a cluster is to ask members to join to a same channel, then they can communicate with other members in this group. in below are the real codes :
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jgroup is a privately held holding company based in lebanon . the company is best known for its work in media and distribution , advertising , investing and the real estate industries . it holds more than 30 subsidiaries from countries such as africa , europe and the united states . jgroup was founded by imad jomaa in 2003 . the company 's digital affiliate , digital venture , partnered with airpush , a mobile advertising company , in july 2015 . 
jgroup is a privately held holding company based in lebanon. the company is best known for its work in media and distribution, advertising, investing and the real estate industries. it holds more than 30 subsidiaries from countries such as africa, europe and the united states. jgroup was founded by imad jomaa in 2003. the company's digital affiliate, digital venture, partnered with airpush, a mobile advertising company, in july 2015.
jgroup is a privately held holding company based in lebanon. the company is best known for its work in media and distribution, advertising, investing and the real estate industries. it holds more than 30 subsidiaries from countries such as africa, europe and the united states. jgroup was founded by imad jomaa in 2003. the company's digital affiliate, digital venture, partnered with airpush, a mobile advertising company, in july 2015.