/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.translator.cassandra;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.teiid.language.Command;
import org.teiid.logging.LogConstants;
import org.teiid.logging.LogManager;
import org.teiid.translator.DataNotAvailableException;
import org.teiid.translator.ExecutionContext;
import org.teiid.translator.ResultSetExecution;
import org.teiid.translator.TranslatorException;
import com.datastax.driver.core.ColumnDefinitions;
import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.ResultSetFuture;
import com.datastax.driver.core.Row;
import com.google.common.util.concurrent.MoreExecutors;
public class CassandraQueryExecution implements ResultSetExecution {
private Command query;
private CassandraConnection connection;
private ResultSetFuture resultSetFuture;
private ResultSet resultSet;
private ExecutionContext executionContext;
protected boolean returnsArray;
public CassandraQueryExecution(Command query, CassandraConnection connection, ExecutionContext context){
this.query = query;
this.connection = connection;
this.executionContext = context;
}
@Override
public void close() {
LogManager.logDetail(LogConstants.CTX_CONNECTOR, CassandraExecutionFactory.UTIL.getString("close_query")); //$NON-NLS-1$
this.resultSet = null;
this.resultSetFuture = null;
}
@Override
public void cancel() throws TranslatorException {
LogManager.logDetail(LogConstants.CTX_CONNECTOR, CassandraExecutionFactory.UTIL.getString("cancel_query")); //$NON-NLS-1$
if (resultSetFuture != null) {
resultSetFuture.cancel(true);
}
}
@Override
public void execute() throws TranslatorException {
CassandraSQLVisitor visitor = new CassandraSQLVisitor();
visitor.translateSQL(query);
String cql = visitor.getTranslatedSQL();
execute(cql);
}
protected void execute(String cql) {
LogManager.logDetail(LogConstants.CTX_CONNECTOR, "Source-Query:", cql); //$NON-NLS-1$
this.executionContext.logCommand(cql);
resultSetFuture = connection.executeQuery(cql);
resultSetFuture.addListener(new Runnable() {
@Override
public void run() {
executionContext.dataAvailable();
}
}, MoreExecutors.directExecutor());
}
@Override
public List<?> next() throws TranslatorException, DataNotAvailableException {
if (!resultSetFuture.isDone()) {
throw DataNotAvailableException.NO_POLLING;
}
if (resultSet == null) {
this.resultSet = this.resultSetFuture.getUninterruptibly();
}
//TODO: use asynch for results fetching
return getRow(resultSet.one());
}
/**
* Iterates through all columns in the {@code row}. For each column, returns its value as Java type
* that matches the CQL type in switch part. Otherwise returns the value as bytes composing the value.
* @param row the row returned by the ResultSet
* @return list of values in {@code row}
*/
List<Object> getRow(Row row) {
if(row == null){
return null;
}
ColumnDefinitions columnDefinitions = row.getColumnDefinitions();
final List<Object> values = new ArrayList<Object>(columnDefinitions.size());
for(int i = 0; i < columnDefinitions.size(); i++){
if (row.isNull(i)) {
values.add(null);
continue;
}
switch(columnDefinitions.getType(i).getName()){
case ASCII:
values.add(row.getString(i));
break;
case BIGINT:
values.add(Long.valueOf(row.getLong(i)));
break;
case BOOLEAN:
values.add(Boolean.valueOf(row.getBool(i)));
break;
case COUNTER:
values.add(Long.valueOf(row.getLong(i)));
break;
case DECIMAL:
values.add(row.getDecimal(i));
break;
case DOUBLE:
values.add(Double.valueOf(row.getDouble(i)));
break;
case FLOAT:
values.add(Float.valueOf(row.getFloat(i)));
break;
case INET:
values.add(row.getInet(i));
break;
case INT:
values.add(Integer.valueOf(row.getInt(i)));
break;
case LIST:
values.add(row.getList(i, Object.class));
break;
case MAP:
values.add(row.getMap(i, Object.class, Object.class));
break;
case SET:
values.add(row.getSet(i, Object.class));
break;
case TEXT:
values.add(row.getString(i));
break;
case TIMESTAMP:
values.add(row.getDate(i));
break;
case TIMEUUID:
values.add(row.getUUID(i));
break;
case UUID:
values.add(row.getUUID(i));
break;
case VARCHAR:
values.add(row.getString(i));
break;
case VARINT:
values.add(row.getVarint(i));
break;
default:
//read as a varbinary
ByteBuffer bytesUnsafe = row.getBytesUnsafe(i);
byte[] b = new byte[bytesUnsafe.remaining()];
bytesUnsafe.get(b);
values.add(b);
break;
}
}
if (returnsArray) {
return Arrays.asList((Object)values.toArray());
}
return values;
}
}