@ConsumerType public interface ConditionCondition Service interface.
In dynamic systems, such as OSGi, one of the more challenging problems can be to define when a system or part of it is ready to do work. The answer can change depending on the individual perspective. The developer of a web server might say, the system is ready when the server starts listening on port 80. An application developer however would define the system as ready when the database connection is up and all servlets are registered. Taking the application developers view, the web server should start listening on port 80 when the application is ready and not beforehand.
Conditionservice interface is a marker interface designed to address this issue. Its role is to provide a dependency that can be tracked. It acts as a defined signal to other services.
Conditionservice must be registered with the
Fields Modifier and Type Field Description
CONDITION_IDService property identifying a condition's unique identifier.
CONDITION_ID_TRUEThe unique identifier for the default True condition.
INSTANCEA condition instance that can be used to register
static final String CONDITION_IDService property identifying a condition's unique identifier.
Conditionservice can potentially describe more then one condition, the type of this service property is
- See Also:
- Constant Field Values
static final String CONDITION_ID_TRUEThe unique identifier for the default True condition.
The default True condition is registered by the framework during framework initialization and therefore can always be relied upon.
static final Condition INSTANCEA condition instance that can be used to register
This can be helpful to avoid a bundle having to implement this interface to register a