modules/indexing/src/main/java/org/apache/ignite/internal/processors/query/h2/H2FieldsIterator.java

/*
 * 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.ignite.internal.processors.query.h2;

import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.ignite.IgniteCheckedException;
import org.apache.ignite.IgniteLogger;
import org.apache.ignite.internal.processors.cache.mvcc.MvccQueryTracker;
import org.apache.ignite.internal.processors.tracing.Tracing;

/**
 * Special field set iterator based on database result set.
 */
public class H2FieldsIterator extends H2ResultSetIterator<List<?>> {
    /** */
    private static final long serialVersionUID = 0L;

    /** */
    private transient MvccQueryTracker mvccTracker;

    /** Connection. */
    private final H2PooledConnection conn;

    /**
     * @param data Data.
     * @param mvccTracker Mvcc tracker.
     * @param pageSize Page size.
     * @param conn Connection.
     * @param tracing Tracing processor.
     * @throws IgniteCheckedException If failed.
     */
    public H2FieldsIterator(
        ResultSet data,
        MvccQueryTracker mvccTracker,
        H2PooledConnection conn,
        int pageSize,
        IgniteLogger log,
        IgniteH2Indexing h2,
        H2QueryInfo qryInfo,
        Tracing tracing
    )
        throws IgniteCheckedException {
        super(data, pageSize, log, h2, qryInfo, tracing);

        assert conn != null;

        this.mvccTracker = mvccTracker;
        this.conn = conn;
    }

    /** {@inheritDoc} */
    @Override protected List<?> createRow() {
        List<Object> res = new ArrayList<>(row.length);

        Collections.addAll(res, row);

        return res;
    }

    /** {@inheritDoc} */
    @Override public void onClose() throws IgniteCheckedException {
        try {
            super.onClose();
        }
        finally {
            conn.close();

            if (mvccTracker != null)
                mvccTracker.onDone();
        }
    }
}