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package database;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.concurrent.Callable;
import main.Watcher;
/**
* Inserts queued brand analyses into the database.
*
* @author Peter Wu
*/
public class BrandAnalyzerInserter implements Callable<Integer>,
Watcher.Progressable {
private final Connection connection;
private final BrandAnalyzerQueue analyzer;
private final NamedPreparedStatement insertBrand;
private volatile int count;
public BrandAnalyzerInserter(Connection connection,
BrandAnalyzerQueue analyzer) throws SQLException {
this.connection = connection;
this.analyzer = analyzer;
this.insertBrand = new NamedPreparedStatement(connection,
"INSERT INTO mentionsbrand"
+ " SELECT :tweetid AS tweetid, :brand AS brand"
+ " WHERE NOT EXISTS (SELECT 1 FROM mentionsbrand WHERE"
+ " tweetid=:tweetid AND brand=:brand)");
connection.setAutoCommit(false);
}
@Override
public Integer call() throws SQLException {
try {
runInserter();
} finally {
connection.close();
}
return count;
}
private void runInserter() throws SQLException {
BrandAnalyzerQueue.Result result;
while ((result = analyzer.next()) != null) {
for (String brand : result.brands) {
QueryUtils.setInsertBrandParams(insertBrand, result.tweetid, brand);
insertBrand.executeUpdate();
}
count++;
// save results every 1000 analyses
if (count % 1000 == 0) {
connection.commit();
}
}
}
@Override
public int getCount() {
return count;
}
}
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