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/*-
 * Copyright (C) 2011, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This file was distributed by Oracle as part of a version of Oracle NoSQL
 * Database made available at:
 *
 * http://www.oracle.com/technetwork/database/database-technologies/nosqldb/downloads/index.html
 *
 * Please see the LICENSE file included in the top-level directory of the
 * appropriate version of Oracle NoSQL Database for a copy of the license and
 * additional information.
 */

package oracle.kv.impl.api.ops;

import static oracle.kv.impl.api.ops.OperationHandler.CURSOR_DEFAULT;

import java.util.List;

import com.sleepycat.je.Transaction;

import oracle.kv.Direction;
import oracle.kv.impl.api.ops.InternalOperation.OpCode;
import oracle.kv.impl.api.ops.OperationHandler.KVAuthorizer;
import oracle.kv.impl.topo.PartitionId;

/**
 * Server handler for {@link MultiGetBatchKeysIterate}.
 *
 * Throughput calculation
 * +---------------------------------------------------------------------------+
 * |    Op         | Choice | # |          Read        |       Write           |
 * |---------------+--------+---+----------------------+-----------------------|
 * | MultiGetBatch.|  N/A   | - | sum of record sizes  |           0           |
 * +---------------------------------------------------------------------------+
 */
class MultiGetBatchKeysIterateHandler
    extends MultiGetBatchIterateOperationHandler {

    MultiGetBatchKeysIterateHandler(OperationHandler handler) {
        super(handler, OpCode.MULTI_GET_BATCH_KEYS,
              MultiGetBatchKeysIterate.class);
    }

    @Override
    public boolean iterate(MultiGetBatchKeysIterate op,
                           Transaction txn,
                           PartitionId partitionId,
                           byte[] parentKey,
                           int subBatchSize,
                           byte[] resumeSubKey,
                           List results) {

        final KVAuthorizer kvAuth = checkPermission(parentKey);
        return iterateKeys(op, txn, partitionId, parentKey,
                           true /*majorPathComplete*/, op.getSubRange(),
                           op.getDepth(), Direction.FORWARD, op.getBatchSize(),
                           resumeSubKey, CURSOR_DEFAULT, results, kvAuth);
    }

    @Override
    public Result createIterateResult(MultiGetBatchKeysIterate op,
                                      List results,
                                      boolean hasMore,
                                      int resumeParentKeyIndex) {

        return new Result.BulkGetKeysIterateResult(getOpCode(),
                                                   op.getReadKB(),
                                                   op.getWriteKB(),
                                                   results, hasMore,
                                                   resumeParentKeyIndex);
    }
}