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/*
* Copyright 2016-2020 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 org.springframework.util.concurrent.ListenableFuture;
import com.datastax.oss.driver.api.core.CqlSession;
import com.datastax.oss.driver.api.core.DriverException;
import com.datastax.oss.driver.api.core.cql.PreparedStatement;
/**
* One of the two central callback interfaces used by the {@link AsyncCqlTemplate} class. This interface prepares a CQL
* statement returning a {@link org.springframework.util.concurrent.ListenableFuture} given a {@link CqlSession},
* provided by the {@link CqlTemplate} class.
*
* Implementations may either create new prepared statements or reuse cached instances. Implementations do not need to
* concern themselves with {@link DriverException}s that may be thrown from operations they attempt. The
* {@link AsyncCqlTemplate} class will catch and handle {@link DriverException}s appropriately.
*
* A {@link AsyncPreparedStatementCreator} should also implement the {@link CqlProvider} interface if it is able to
* provide the CQL it uses for {@link PreparedStatement} creation. This allows for better contextual information in case
* of exceptions.
*
* @author Mark Paluch
* @since 2.0
* @see AsyncCqlTemplate#execute(AsyncPreparedStatementCreator, PreparedStatementCallback)
*/
@FunctionalInterface
public interface AsyncPreparedStatementCreator {
/**
* Create a statement in this session. Allows implementations to use {@link PreparedStatement}s. The
* {@link CqlTemplate} will attempt to cache the {@link PreparedStatement}s for future use without the overhead of
* re-preparing on the entire cluster.
*
* @param session Session to use to create statement, must not be {@literal null}.
* @return a prepared statement.
* @throws DriverException there is no need to catch DriverException that may be thrown in the implementation of this
* method. The {@link AsyncCqlTemplate} class will handle them.
*/
ListenableFuture createPreparedStatement(CqlSession session) throws DriverException;
}