Difference between revisions of "IS-Manager"
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==IS-MANAGER Architecture== | ==IS-MANAGER Architecture== | ||
The IS-Manager is designed as two software components to render it more scalable. | The IS-Manager is designed as two software components to render it more scalable. | ||
| − | *agents, which operate at the | + | *agents, which operate at the VO level by retrieving data, buffering it, and sending it to the master |
| − | *master, which collects and stores data from the agents. The master is the interface towards the infrastructure for the IS-Manager. | + | *master, which collects and stores data from the agents by operating at Infrastructure level. The master is the interface towards the infrastructure for the IS-Manager. |
===The Agent=== | ===The Agent=== | ||
| − | An Agent is a service deployed in each | + | An Agent is a service deployed in each VO from which, through the IS-Registry, it retrieves all profiles and their updates. This data, after being processed, is buffered and transmitted to the Retriever component that is a module of the Master service. For the kind of interaction the Agent has with the IS-Registry, it is compulsory to co-deploy the Agent service with the IS-Registry service. |
====Agent Architecture==== | ====Agent Architecture==== | ||
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===The Master=== | ===The Master=== | ||
| − | The Master is a service deployed at the | + | The Master is a service deployed at the Infrastructure level. |
The Master is organized into the following modules: | The Master is organized into the following modules: | ||
*the Retriever, that collects all the information received from each Agent; | *the Retriever, that collects all the information received from each Agent; | ||
Revision as of 11:20, 5 September 2008
THIS SECTION OF GCUBE DOCUMENTATION IS CURRENTLY UNDER UPDATE.
Contents
IS-MANAGER Architecture
The IS-Manager is designed as two software components to render it more scalable.
- agents, which operate at the VO level by retrieving data, buffering it, and sending it to the master
- master, which collects and stores data from the agents by operating at Infrastructure level. The master is the interface towards the infrastructure for the IS-Manager.
The Agent
An Agent is a service deployed in each VO from which, through the IS-Registry, it retrieves all profiles and their updates. This data, after being processed, is buffered and transmitted to the Retriever component that is a module of the Master service. For the kind of interaction the Agent has with the IS-Registry, it is compulsory to co-deploy the Agent service with the IS-Registry service.
Agent Architecture
Retrieving data from IS-Registry is not performed by a subscription to the IS-Notifier. Rather, it exploits the gCore Event Framework that allows to make the system more scalable. The Agent is notified directly by the IS-Registry and for each notification the type of operation (CREATE, UPDATE, REMOVE) and the updated or new profile represented by a GCUBEREsource object are transmitted to the Retriever. The profile processing performed by the Agent is computed according to the following rules:
- If the profile is new, it is serialized into XML with internal procedures;
- If the profile is an update, the difference between the new profile and the old one that has been cached by the agent is calculated. The difference is represented using XML.
- If the profile has been removed, only the ID is transmitted.
The XML produced by this processing is buffered and, at regular times or when a certain number of processed profiles has been reached, all processed profiles are transmitted to the Retriever.
The Master
The Master is a service deployed at the Infrastructure level. The Master is organized into the following modules:
- the Retriever, that collects all the information received from each Agent;
- the relational database, where all the information are stored;
- the DBManager, that manages the interaction with the database;
- the Manager, that reacts to profile modifications, e.g. the alteration of a service state;
- the Lookup, that provides an interface to consume the data stored in the IS-Manager.
Data storing
All the procedures for data storing are hidden by a DAO (Data Access Object) pattern. All data is stored into a relational database.
Retriever
