modules/indexing/src/main/java/org/apache/ignite/internal/processors/query/h2/twostep/GridMergeTable.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.twostep;

import java.util.ArrayList;
import java.util.UUID;
import org.apache.ignite.internal.GridKernalContext;
import org.h2.command.ddl.CreateTableData;
import org.h2.engine.Session;
import org.h2.index.Index;
import org.h2.index.IndexType;
import org.h2.message.DbException;
import org.h2.result.Row;
import org.h2.table.IndexColumn;
import org.h2.table.TableBase;

/**
 * Merge table for distributed queries.
 */
public class GridMergeTable extends TableBase {
    /** */
    private final GridKernalContext ctx;

    /** */
    private final GridMergeIndex idx;

    /**
     * @param data Data.
     * @param ctx Kernal context.
     */
    public GridMergeTable(CreateTableData data, GridKernalContext ctx) {
        super(data);

        this.ctx = ctx;
        idx = new GridMergeIndexUnsorted(this, "merge_scan");
    }

    /**
     * Fails merge table if any source node is left.
     */
    public void checkSourceNodesAlive() {
        for (UUID nodeId : idx.sources()) {
            if (!ctx.discovery().alive(nodeId)) {
                idx.fail(nodeId);

                return;
            }
        }
    }

    /** {@inheritDoc} */
    @Override public boolean lock(Session session, boolean exclusive, boolean force) {
        return false;
    }

    /** {@inheritDoc} */
    @Override public void close(Session ses) {
        idx.close(ses);
    }

    /** {@inheritDoc} */
    @Override public void unlock(Session s) {
        // No-op.
    }

    /** {@inheritDoc} */
    @Override public Index addIndex(Session session, String indexName, int indexId, IndexColumn[] cols,
        IndexType indexType, boolean create, String indexComment) {
        throw DbException.getUnsupportedException("addIndex");
    }

    /** {@inheritDoc} */
    @Override public void removeRow(Session session, Row row) {
        throw DbException.getUnsupportedException("removeRow");
    }

    /** {@inheritDoc} */
    @Override public void truncate(Session session) {
        throw DbException.getUnsupportedException("truncate");
    }

    /** {@inheritDoc} */
    @Override public void addRow(Session session, Row row) {
        throw DbException.getUnsupportedException("addRow");
    }

    /** {@inheritDoc} */
    @Override public void checkSupportAlter() {
        throw DbException.getUnsupportedException("alter");
    }

    /** {@inheritDoc} */
    @Override public String getTableType() {
        return EXTERNAL_TABLE_ENGINE;
    }

    /** {@inheritDoc} */
    @Override public GridMergeIndex getScanIndex(Session session) {
        return idx;
    }

    /** {@inheritDoc} */
    @Override public Index getUniqueIndex() {
        return null; // We don't have a PK.
    }

    /** {@inheritDoc} */
    @Override public ArrayList<Index> getIndexes() {
        return null;
    }

    /** {@inheritDoc} */
    @Override public boolean isLockedExclusively() {
        return false;
    }

    /** {@inheritDoc} */
    @Override public long getMaxDataModificationId() {
        return 0;
    }

    /** {@inheritDoc} */
    @Override public boolean isDeterministic() {
        return true;
    }

    /** {@inheritDoc} */
    @Override public boolean canGetRowCount() {
        return true;
    }

    /** {@inheritDoc} */
    @Override public boolean canDrop() {
        return true;
    }

    /** {@inheritDoc} */
    @Override public long getRowCount(Session ses) {
        return idx.getRowCount(ses);
    }

    /** {@inheritDoc} */
    @Override public long getRowCountApproximation() {
        return idx.getRowCountApproximation();
    }

    /** {@inheritDoc} */
    @Override public long getDiskSpaceUsed() {
        return 0;
    }

    /** {@inheritDoc} */
    @Override public void checkRename() {
        throw DbException.getUnsupportedException("rename");
    }
}