dc3-common-constant is the shared constants and enumerations module of the IoT DC3 platform. It defines platform-wide constants, routing keys, service names, URL prefixes, and top-level domain/wire/persistence enums used across services, drivers, and common modules. Constants and nested enums used by only one module, protocol, configuration object, or implementation remain beside their owner until they become a stable cross-module contract. Top-level *Constant classes and top-level public enums are reserved for this module; local holders use concern-specific names such as *Limits or *Defaults.

Module Information

Group ID: io.github.pnoker
Artifact ID: dc3-common-constant

Key Components

Service Constants

Class	Purpose
`AuthConstant`	Auth service name, URL prefixes
`ManagerConstant`	Manager service name (`dc3-center-manager`), URL prefixes
`DataConstant`	Data service name, URL prefixes, point value API constants
`DriverConstant`	Driver service name helpers

RabbitMQ Constants

RabbitConstant defines all exchange names, queue name prefixes, and routing key prefixes:

Constant	Base value
`TOPIC_EXCHANGE_POINT_COMMAND`	`dc3.e.point_command`
`TOPIC_EXCHANGE_COMMAND`	`dc3.e.command`
`TOPIC_EXCHANGE_METADATA`	`dc3.e.metadata`
`TOPIC_EXCHANGE_VALUE`	`dc3.e.value`
`TOPIC_EXCHANGE_EVENT`	`dc3.e.event`
`ROUTING_POINT_COMMAND_PREFIX`	`dc3.r.point_command.`
`ROUTING_COMMAND_PREFIX`	`dc3.r.command.`
`ROUTING_DRIVER_METADATA_PREFIX`	`dc3.r.metadata.driver.`
`ROUTING_POINT_VALUE_PREFIX`	`dc3.r.value.point.`

The runtime may prepend the dc3.rabbit.tag system-property value to exchange, queue, and selected routing constants. Point read/write operations use the point-command constants; TOPIC_EXCHANGE_COMMAND is reserved for custom commands. Routing keys are suffixed with the driver's service name. Do not rename them without updating every producer, binding, consumer, and deployed queue migration.

Common Constants

Class	Purpose
`DefaultConstant`	Platform defaults (page size, etc.)
`TimeConstant`	Date/time format strings
`RequestConstant`	HTTP header key names (tenant/user injection)
`RequestIdConstant`	Cross-transport request correlation keys
`PrefixConstant` / `SuffixConstant`	Common cache/key prefixes and suffixes

Enumerations

Located in io.github.pnoker.common.enums. The list below is a selection of the most commonly referenced enums; see the package for the complete set (alarm, MCP, OAuth, notify, and other domain enums live there too):

EnableFlagEnum — Boolean-like enable/disable state
EntityStatusEnum — Online, offline, maintenance, and fault states
DriverTypeEnum — Driver client/server, gateway, and connection classifications
PointTypeEnum — Point value types such as string, numeric, and boolean
MetadataOperateTypeEnum — Metadata add/delete/update operations
PointCommandTypeEnum — Point read, batch-read, write, batch-write, and configuration commands
AttributeTypeEnum — Attribute value types
ProfileShareTypeEnum — Tenant-, driver-, and user-scoped profile sharing

Build Instructions

mvn -s .mvn/settings.xml -pl dc3-common/dc3-common-constant -am package

Testing

Run the module tests from the repository root:

mvn -s .mvn/settings.xml -pl dc3-common/dc3-common-constant -am test

Used as a dependency by virtually all other dc3-common-* and dc3-center-* modules.

README.md

DC3 Common Constant

Overview