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See:
Description
Class Summary | |
---|---|
ServiceDiscovery | The discovery class provides factory methods for creating instances of service information objects and a caching mechanism. |
ServiceInfo | A service information object provides an interface that can be used to query for provider instances defined in system properties, system wide JVM settings, or service descriptors in the class path. |
The discovery mechanism allows Java source code to discover and utilize interchangeable service provider implementations.
The service provider interface allows application code to be loosely coupled to a particular service implementation while providing several mechanisms for providers to be added or replaced by the user or system administrator without requiring a corresponding application code change.
When a system is specified, the helper utility will first attempt to load a
properties file in the lib
directory within the Java home directory named
as the system identifier followed by .properties
, i.e. net
specific
provider information will be specified in the file $JAVA_HOME/lib/net.properties
.
Next the helper will check the system properties for an overriding provider. If a property exists named the same as the fully qualifies class name of the provider service class, the value is used as a concrete implementation class name.
Finally the helper searches either the current loader or a given class loader for service descriptor files under a common directory, as defined by the JAR specification.
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