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Cassandra support for Spring Data
/*
* Copyright 2013-2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.data.cassandra.core.cql;
import java.util.Collection;
import com.datastax.driver.core.Host;
import com.datastax.driver.core.exceptions.DriverException;
/**
* An interface used by {@link CqlTemplate} for mapping {@link Host}s of a {@link com.datastax.driver.core.Metadata} on
* a per-item basis.. Implementations of this interface perform the actual work of mapping each host to a result object,
* but don't need to worry about exception handling. {@link DriverException} will be caught and handled by the calling
* {@link CqlTemplate}.
*
* @author Matthew T. Adams
* @author Mark Paluch
* @see CqlTemplate
*/
@FunctionalInterface
public interface HostMapper {
/**
* Implementations must implement this method to map each {@link Host} in the
* {@link com.datastax.driver.core.Metadata}.
*
* @param hosts the {@link Iterable} of {@link Host}s to map, must not be {@literal null}.
* @return the result objects for the given hosts.
* @throws DriverException if a {@link DriverException} is encountered mapping values (that is, there's no need to
* catch {@link DriverException}).
*/
Collection mapHosts(Iterable hosts) throws DriverException;
}