Package edu.ucsb.adl.middleware

The main middleware source code.

See:
Description

Interface Summary

CancelServiceGatekeeper	The interface between the ADL cancel service and the gatekeeper that controls access to the service.
CollectionDriver	The interface between the ADL collection service and drivers that implement the service on behalf of collections.
CollectionDriverGatekeeper	The interface between the ADL collection service and gatekeepers that control access to the drivers that implement the service on behalf of collections.
CollectionServiceGatekeeper	The interface between the ADL collection service and the gatekeeper that controls access to the service.
Comparable	An object which supports a total ordering with like objects.
ConfigurationServiceGatekeeper	The interface between the ADL configuration service and the gatekeeper that controls access to the service.
GenericGatekeeper	An interface that can be implemented by generic gatekeepers, i.e., by gatekeepers whose authorization is computed irrespective of the service being invoked or the collection being operated upon.
IdentifiersDriver	The interface between the ADL identifiers service and drivers that implement the service on behalf of collections.
IdentifiersDriverGatekeeper	The interface between the ADL identifiers service and gatekeepers that control access to the drivers that implement the service on behalf of collections.
IdentifiersServiceGatekeeper	The interface between the ADL identifiers service and the gatekeeper that controls access to the service.
MetadataDriver	The interface between the ADL metadata service and drivers that implement the service on behalf of collections.
MetadataDriverGatekeeper	The interface between the ADL metadata service and gatekeepers that control access to the drivers that implement the service on behalf of collections.
MetadataServiceGatekeeper	The interface between the ADL metadata service and the gatekeeper that controls access to the service.
QueryDriver	The interface between the ADL query service and drivers that implement the service on behalf of collections.
QueryDriverGatekeeper	The interface between the ADL query service and gatekeepers that control access to the drivers that implement the service on behalf of collections.
QueryServiceGatekeeper	The interface between the ADL query service and the gatekeeper that controls access to the service.
QueryThread	A thread that represents the processing of a query on behalf of a collection.
Ranker	A query result ranker.
ReferenceServiceGatekeeper	The interface between the ADL reference service and the gatekeeper that controls access to the service.
ResultsServiceGatekeeper	The interface between the ADL results service and the gatekeeper that controls access to the service.
StatusServiceGatekeeper	The interface between the ADL status service and the gatekeeper that controls access to the service.
UnloadServiceGatekeeper	The interface between the ADL unload service and the gatekeeper that controls access to the service.
UnreferenceServiceGatekeeper	The interface between the ADL unreference service and the gatekeeper that controls access to the service.

Class Summary

BasicPasswordGatekeeper	A simple gatekeeper that implements all gatekeeper interfaces and that bases authorization on the HTTP "basic" authentication scheme, i.e., on openly-transmitted usernames and passwords.
CacheControlServlet	Servlet to manage metadata caches.
CacheLoaderThread	Background thread that preloads a metadata cache.
CachingMetadataDriver	Metadata driver that caches reports.
CancelService	The ADL cancel service.
CancelServlet	HTTP interface to the ADL cancel service.
CollectionAvailabilityServlet	Servlet that allows a collection to be enabled or disabled.
CollectionService	The ADL collection service.
CollectionServlet	HTTP interface to the ADL collection service.
CombinationGatekeeper	A gatekeeper that implements all gatekeeper interfaces and that bases authorization on a boolean combination of one or more other gatekeepers.
ConfigurationFile	Holds the contents of a middleware configuration file.
ConfigurationService	The ADL configuration service.
ConfigurationServlet	HTTP interface to the ADL configuration service.
ConstantGatekeeper	A simple gatekeeper that implements all gatekeeper interfaces and returns the same, constant value (true or false) on all requests.
DateRanker	Ranks query results by date.
DurationUtils	Time duration-related utilities.
ErrorHandlerServlet	Tomcat error page.
ExtendedProperties	Extends class java.util.Properties to support macro substitution in property values.
FootprintServlet	Displays a footprint on a base map.
Global	Stores global quantities and performs global initializations.
IdentifiersService	The ADL identifiers service.
IdentifiersServlet	HTTP interface to the ADL identifiers service.
IPAddressGatekeeper	A simple gatekeeper that implements all gatekeeper interfaces and bases authorization on the client's IP address (only).
LoginServlet	Sample servlet that triggers a web browser to ask the user for a username and password.
MetadataService	The ADL metadata service.
MetadataServlet	HTTP interface to the ADL metadata service.
ObjectLoader	Provides the ability to create instances of dynamically loaded classes.
PassthruAccumulator	A result accumulator that immediately passes query results to the associated result set.
PriorityDeque	A double-ended priority queue, or "priority deque".
Query	A query.
Query.BooleanConstraint	A boolean combination of two or more subconstraints.
Query.Constraint	Abstract base class for constraints.
Query.Field	Identifies a metadata field.
Query.HierarchicalConstraint	A hierarchical categorization constraint.
Query.IdentificationConstraint	An identification constraint.
Query.NumericConstraint	A numeric constraint.
Query.RelationalConstraint	A relational constraint.
Query.SimpleConstraint	Abstract base class for simple (non-boolean) constraints.
Query.SpatialConstraint	A spatial (i.e., geographic) constraint.
Query.SpatialConstraint.Vertex	A polygon vertex.
Query.TemporalConstraint	A temporal constraint.
Query.TextualConstraint	A textual constraint.
QueryDtd	DTD parse tables.
QueryService	The ADL query service.
QueryServlet	HTTP interface to the ADL query service.
RankingAccumulator	A result accumulator that ranks query results before adding them to the associated result set.
ReferenceCountedDelayedDestroy	A base class that supports reference counting and delayed destruction.
ReferenceService	The ADL reference service.
ReferenceServlet	HTTP interface to the ADL reference service.
ReportCache	Caches reports for a metadata view for a collection.
Result	A query result, i.e., a collection item represented as a triplet of standard metadata views.
ResultAccumulator	Abstract base class of all query result accumulators.
ResultSet	A result set, i.e., the results of a query.
ResultsService	The ADL results service.
ResultsServlet	HTTP interface to the ADL results service.
SpatialRanker	Ranks query results by spatial similarity to the query region.
StatusService	The ADL status service.
StatusServlet	HTTP interface to the ADL status service.
UnloadService	The ADL unload service.
UnloadServlet	HTTP interface to the ADL unload service.
UnreferenceService	The ADL unreference service.
UnreferenceServlet	HTTP interface to the ADL unreference service.
Version	Records the version of the middleware.
XmlUtils	XML-related utilities.

Exception Summary

BadRequestException	Thrown when a client request is invalid.
CancelException	Thrown when an operation is canceled by client request.
InternalErrorException	Thrown when an error is encountered that is no fault of the client.
MiddlewareException	A general middleware exception.
NoAuthorizationException	Thrown when a client request lacks the proper authorization.
ResourceException	Thrown when a resource limit has been exceeded.
UnsupportedException	Thrown when a client request is valid but not supported.

Package edu.ucsb.adl.middleware Description

The main middleware source code.