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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* http://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.apache.cassandra.cql3;
import java.nio.ByteBuffer;
import java.util.Map;
import org.apache.cassandra.cql3.statements.BatchStatement;
import org.apache.cassandra.exceptions.RequestExecutionException;
import org.apache.cassandra.exceptions.RequestValidationException;
import org.apache.cassandra.service.ClientState;
import org.apache.cassandra.service.QueryState;
import org.apache.cassandra.transport.messages.ResultMessage;
import org.apache.cassandra.utils.MD5Digest;
public interface QueryHandler
{
CQLStatement parse(String queryString, QueryState queryState, QueryOptions options);
ResultMessage process(CQLStatement statement,
QueryState state,
QueryOptions options,
Map customPayload,
long queryStartNanoTime) throws RequestExecutionException, RequestValidationException;
ResultMessage.Prepared prepare(String query,
ClientState clientState,
Map customPayload) throws RequestValidationException;
QueryHandler.Prepared getPrepared(MD5Digest id);
ResultMessage processPrepared(CQLStatement statement,
QueryState state,
QueryOptions options,
Map customPayload,
long queryStartNanoTime) throws RequestExecutionException, RequestValidationException;
ResultMessage processBatch(BatchStatement statement,
QueryState state,
BatchQueryOptions options,
Map customPayload,
long queryStartNanoTime) throws RequestExecutionException, RequestValidationException;
public static class Prepared
{
public final CQLStatement statement;
public final MD5Digest resultMetadataId;
/**
* Contains the CQL statement source if the statement has been "regularly" perpared via
* {@link QueryHandler#prepare(String, ClientState, Map)}.
* Other usages of this class may or may not contain the CQL statement source.
*/
public final String rawCQLStatement;
public final String keyspace;
public final boolean fullyQualified;
public Prepared(CQLStatement statement, String rawCQLStatement, boolean fullyQualified, String keyspace)
{
this.statement = statement;
this.rawCQLStatement = rawCQLStatement;
this.resultMetadataId = ResultSet.ResultMetadata.fromPrepared(statement).getResultMetadataId();
this.fullyQualified = fullyQualified;
this.keyspace = keyspace;
}
}
}