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/*
* Copyright 2006-2012 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* Licensed 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 com.amazon.carbonado.repo.jdbc;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import com.amazon.carbonado.PersistException;
import com.amazon.carbonado.sequence.AbstractSequenceValueProducer;
/**
*
*
* @author Brian S O'Neill
*/
class JDBCSequenceValueProducer extends AbstractSequenceValueProducer {
private final JDBCRepository mRepo;
private final String mQuery;
JDBCSequenceValueProducer(JDBCRepository repo, String sequenceQuery) {
mRepo = repo;
mQuery = sequenceQuery;
}
public long nextLongValue() throws PersistException {
try {
Connection con = mRepo.getConnection();
try {
Statement st = con.createStatement();
try {
ResultSet rs = st.executeQuery(mQuery);
try {
if (rs.next()) {
return rs.getLong(1);
}
throw new PersistException("No results from sequence query: " + mQuery);
} finally {
rs.close();
}
} finally {
st.close();
}
} finally {
mRepo.yieldConnection(con);
}
} catch (Exception e) {
throw mRepo.toPersistException(e);
}
}
/**
* @since 1.2
*/
public boolean returnReservedValues() {
return false;
}
}
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