com.mysql.cj.xdevapi.StreamingSqlResultBuilder Maven / Gradle / Ivy
/*
* Copyright (c) 2019, 2020, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
* authors of MySQL hereby grant you an additional permission to link the
* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
* http://oss.oracle.com/licenses/universal-foss-exception.
*
* This program 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 General Public License, version 2.0,
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.cj.xdevapi;
import java.util.ArrayList;
import java.util.List;
import java.util.TimeZone;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Supplier;
import com.mysql.cj.MysqlxSession;
import com.mysql.cj.conf.PropertySet;
import com.mysql.cj.exceptions.CJCommunicationsException;
import com.mysql.cj.protocol.ColumnDefinition;
import com.mysql.cj.protocol.ProtocolEntity;
import com.mysql.cj.protocol.ResultBuilder;
import com.mysql.cj.protocol.x.Notice;
import com.mysql.cj.protocol.x.StatementExecuteOk;
import com.mysql.cj.protocol.x.StatementExecuteOkBuilder;
import com.mysql.cj.protocol.x.XProtocol;
import com.mysql.cj.protocol.x.XProtocolRowInputStream;
import com.mysql.cj.result.Field;
/**
* Result builder producing a streaming {@link SqlResult} instance.
*/
public class StreamingSqlResultBuilder implements ResultBuilder {
TimeZone defaultTimeZone;
PropertySet pset;
XProtocol protocol;
StatementExecuteOkBuilder statementExecuteOkBuilder = new StatementExecuteOkBuilder();
boolean isRowResult = false;
ProtocolEntity lastEntity = null;
List resultSets = new ArrayList<>();
private SqlResult result;
public StreamingSqlResultBuilder(MysqlxSession sess) {
this.defaultTimeZone = sess.getServerSession().getDefaultTimeZone();
this.pset = sess.getPropertySet();
this.protocol = sess.getProtocol();
}
@Override
public boolean addProtocolEntity(ProtocolEntity entity) {
if (entity instanceof Notice) {
this.statementExecuteOkBuilder.addProtocolEntity(entity);
} else {
this.lastEntity = entity;
}
AtomicBoolean readLastResult = new AtomicBoolean(false);
Supplier okReader = () -> {
if (readLastResult.get()) {
throw new CJCommunicationsException("Invalid state attempting to read ok packet");
}
if (this.protocol.hasMoreResults()) {
StatementExecuteOk res = this.statementExecuteOkBuilder.build();
this.statementExecuteOkBuilder = new StatementExecuteOkBuilder();
return res;
}
readLastResult.set(true);
return this.protocol.readQueryResult(this.statementExecuteOkBuilder);
};
Supplier resultStream = () -> {
if (readLastResult.get()) {
return null;
} else if (this.lastEntity != null && this.lastEntity instanceof Field || this.protocol.isSqlResultPending()) {
ColumnDefinition cd;
if (this.lastEntity != null && this.lastEntity instanceof Field) {
cd = this.protocol.readMetadata((Field) this.lastEntity, (n) -> {
this.statementExecuteOkBuilder.addProtocolEntity(n);
});
this.lastEntity = null;
} else {
cd = this.protocol.readMetadata();
}
return new SqlSingleResult(cd, this.protocol.getServerSession().getDefaultTimeZone(), new XProtocolRowInputStream(cd, this.protocol, (n) -> {
this.statementExecuteOkBuilder.addProtocolEntity(n);
}), okReader, this.pset);
} else {
readLastResult.set(true);
SqlResultBuilder rb = new SqlResultBuilder(this.defaultTimeZone, this.pset);
rb.addProtocolEntity(entity);
return this.protocol.readQueryResult(rb);
}
};
this.result = new SqlMultiResult(resultStream);
return true;
}
@Override
public SqlResult build() {
return this.result;
}
}