/* This file is part of VoltDB.
* Copyright (C) 2008-2014 VoltDB Inc.
*
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* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
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* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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*/
//
// Accepts a vote, enforcing business logic: make sure the vote is for a valid
// contestant and that the voter (phone number of the caller) is not above the
// number of allowed votes.
//
package LiveRejoinConsistency.procedures;
import org.voltdb.ProcInfo;
import org.voltdb.SQLStmt;
import org.voltdb.VoltProcedure;
import org.voltdb.VoltTable;
import org.voltdb.VoltTableRow;
@ProcInfo (
partitionInfo = "counters_ptn.id:0",
singlePartition = true
)
public class getNextFromPtn extends VoltProcedure {
// potential return codes
public static final long ERR_INVALID_COUNTER = 0;
// get Counter
public final SQLStmt getCounterStmt = new SQLStmt(
"SELECT counter FROM counters_ptn WHERE id = ? order by id;");
// update Counter
public final SQLStmt updateCounterStmt = new SQLStmt(
"UPDATE counters_ptn SET counter = ? WHERE id = ? and counter = ?;");
public long run(int id, long inc) {
voltQueueSQL(getCounterStmt, EXPECT_ZERO_OR_ONE_ROW, id);
VoltTable validation[] = voltExecuteSQL();
if (validation[0].getRowCount() != 1) {
return ERR_INVALID_COUNTER;
}
VoltTableRow row = validation[0].fetchRow(0);
// what happens when this overflows?
long count = row.getLong(0)+inc;
voltQueueSQL(updateCounterStmt, EXPECT_ONE_ROW, count, id, row.getLong(0));
VoltTable result[] = voltExecuteSQL(true);
// return the updated value
return count;
}
}