Push technology allows users to subscribe to information that is pushed to their computer based on events. It is a protocol used for gathering and receiving information, and is an example of a publish and subscribe model. It removes the need for constant pinging or pulling from subscribers, making it more efficient. Examples include push email technology and stock ticker feeds.
In the world of computer protocols, there are multiple methods of sharing data between computers. Push technology is an example of a protocol that allows a user to subscribe to information, which is then pushed to their computer based on events. This technology is one of many types of protocols that can address specific business needs related to gathering and receiving information.
The art of system architecture includes designing appropriate models to meet specific business needs within a computer application. These models include protocols for accounting for events, asynchronous and synchronous processing, and publish and subscribe models. Server push technology is an example of a publish and subscribe model in which the user will receive periodic updates of information.
Many email systems use what is usually referred to as push email technology. This is the kind of technology that is routinely implemented with most personal digital assistant (PDA) devices to receive email updates at timed intervals. When new emails are received in the central mail server inbox, they are delivered to subscribed email devices in a more elegant way.
With the traditional use of push technology, it is relatively easy to implement this approach within an application. The main requirement is to create a central server that manages and maintains subscribed parties for specific events and activities. This manager will notify subscribers when an event occurs and publish the information that has been subscribed to the user, with a push of the information.
The publish and subscribe model has many benefits, including removing the need for a constant ping or pull from all subscribers. Before the creation of push technology, a user would need to constantly request new data from the server. This ping for new data would be based on a specified time variable. Push technology allows a central server full control of when data is pushed to subscribers, which creates a more efficient implementation of the solution.
Another example of push technology is the use of stock ticker feeds on the Internet. This very simple syndication feed (RSS) is based on the publish and subscribe model. In this example a user subscribes to the stock ticker and enters the stock she wishes to monitor. Whenever the stock price changes, updates are sent to the user with the newly defined price.
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