Architecture

Fuse is not built using a traditional layered Web architecture. Rather, it is built using a new architecture that supports better control over data for owners.

This architecture uses persistent compute objects, or picos, as it's fundamental building block and supports an unhosted or personal cloud application architecture (PCAA). As with anything different, there are opportunities and challenges.

The following articles provide some background on picos and PCAAs.

Events and Queries

Fuse uses an event-query API rather than a strictly RESTful API. The documentation will present events like so:

<event domain>:<event type>

where the event domain and type are separated by a colon. Most event also use event attributes which will be presented as name-value pairs.

Events are raised to Fuse by encoding them in HTTP. The Sky Event API describes how this encoding is done. The JavaScript SDK includes a function, CloudOS.raiseEvent(), and support structure for encoding the event with its attributes and performing an HTTP POST.

Queries will be presented like so:

<query domain>:<query name>(<param0>, <param1>,...,<paramn>)

Queries are raised to Fuse by encoding them as HTTP. The Sky Cloud API describes how this encoding is done. The JavaScript SDK includes a function, CloudOS.skyCloud(), that encodes a query with its parameters and performs an HTTP GET.

This table provides the query domains for the primary service modules that make up the overall Fuse system. There is a development and a production domain.

Production Domain	Development Domain	Ruleset Name	Description
b16x9	v1_fuse_vehicle	fuse_vehicle.krl	Services for the overall vehicle Pico
b16x10	v1_fuse_keys	fuse_keys.krl	Keys for various APIs (protected)
b16x11	v1_fuse_carvoyant	fuse_carvoyant_mashery.krl	Services for interacting with Carvoyant API
b16x13	v1_fuse_error	fuse_error.krl	Services for handling error events
b16x16	v1_fuse_owner	fuse_init.krl	Services for the owner pico
b16x17	v1_fuse_fleet	fuse_fleet.krl	Services for managing the fleet
b16x18	v1_fuse_trips	fuse_trips.krl	Series for Trips API
b16x19	v1_fuse_common	fuse_common.krl	Common functions; used by most Fuse rulesets
b16x20	v1_fuse_fuel	fuse_fuel.krl	Services for the Fuel API
b16x21	v1_fuse_maintenance	fuse_maintenance.krl	Services for the Maintenance API
b16x22	v1_fuse_bootstrap	fuse_bootstrap.krl	Service for bootstrapping a new Fuse account
b16x23	v1_fuse_fleet_oauth	fuse_fleet_oauth.krl	Services for managing OAuth between the fleet pico and Carvoyant

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