ddf.catalog.federation

Interface FederationStrategy

All Known Implementing Classes:

AbstractFederationStrategy, CachingFederationStrategy, FifoFederationStrategy, SortedFederationStrategy

public interface FederationStrategy

Implementations of this interface federate the specified query to all the Sources in the list, process the Results in a unique way, and then return the results to the client.

For example, implementations can choose to block until all SourceResponses return then do a mass sort, or to return the results back to the client as soon as they are received back from a FederatedSource.

Author:

ddf.isgs@lmco.com

Method Summary

Modifier and Type	Method and Description
QueryResponse	federate(List<Source> sources, QueryRequest query) Federate the given query to the List of Sources, returning a QueryResponse back to the user that will include the matching Results.

Method Detail

federate

QueryResponse federate(List<Source> sources,
                       QueryRequest query)
                throws FederationException

Federate the given query to the List of Sources, returning a QueryResponse back to the user that will include the matching Results.

Parameters:

sources - the List of Sources to be queried. Cannot be null or empty.

query - the QueryRequest to execute. Cannot be null.

Returns:

QueryResponse which contains the list of Results.

Throws:

FederationException