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JDBC Type 4 driver for MySQL
/*
* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
*
* 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.protocol.x;
import java.util.ArrayList;
import com.google.protobuf.GeneratedMessage;
import com.mysql.cj.exceptions.WrongArgumentException;
import com.mysql.cj.protocol.ColumnDefinition;
import com.mysql.cj.protocol.MessageListener;
import com.mysql.cj.protocol.ProtocolEntityFactory;
import com.mysql.cj.protocol.ResultListener;
import com.mysql.cj.result.DefaultColumnDefinition;
import com.mysql.cj.result.Field;
import com.mysql.cj.x.protobuf.Mysqlx.Error;
import com.mysql.cj.x.protobuf.MysqlxNotice.Frame;
import com.mysql.cj.x.protobuf.MysqlxResultset.ColumnMetaData;
import com.mysql.cj.x.protobuf.MysqlxResultset.FetchDone;
import com.mysql.cj.x.protobuf.MysqlxResultset.Row;
import com.mysql.cj.x.protobuf.MysqlxSql.StmtExecuteOk;
/**
* A {@link MessageListener} to handle result data and propagate it to a {@link ResultListener}.
*/
public class ResultMessageListener implements MessageListener {
private ResultListener callbacks;
private ProtocolEntityFactory fieldFactory;
private ProtocolEntityFactory noticeFactory;
/**
* Accumulate metadata before delivering to client.
*/
private ArrayList fields = new ArrayList<>();
private ColumnDefinition metadata = null;
/**
* Have we finished reading metadata and send it to client yet?
*/
private boolean metadataSent = false;
private StatementExecuteOkBuilder okBuilder = new StatementExecuteOkBuilder();
public ResultMessageListener(ProtocolEntityFactory colToField, ProtocolEntityFactory noticeFactory,
ResultListener callbacks) {
this.callbacks = callbacks;
this.fieldFactory = colToField;
this.noticeFactory = noticeFactory;
}
public Boolean createFromMessage(XMessage message) {
@SuppressWarnings("unchecked")
Class msgClass = (Class) message.getMessage().getClass();
// accumulate metadata and deliver to listener on first non-metadata message
if (ColumnMetaData.class.equals(msgClass)) {
Field f = this.fieldFactory.createFromMessage(message);
this.fields.add(f);
return false; /* done reading? */
}
if (!this.metadataSent) {
if (this.metadata == null) {
this.metadata = new DefaultColumnDefinition(this.fields.toArray(new Field[] {}));
}
this.callbacks.onMetadata(this.metadata);
this.metadataSent = true;
}
if (StmtExecuteOk.class.equals(msgClass)) {
this.callbacks.onComplete(this.okBuilder.build());
return true; /* done reading? */
} else if (FetchDone.class.equals(msgClass)) {
// ignored. wait for StmtExecuteOk
return false; /* done reading? */
} else if (Row.class.equals(msgClass)) {
if (this.metadata == null) {
this.metadata = new DefaultColumnDefinition(this.fields.toArray(new Field[] {}));
}
XProtocolRow row = new XProtocolRow(this.metadata, Row.class.cast(message.getMessage()));
this.callbacks.onRow(row);
return false; /* done reading? */
} else if (Error.class.equals(msgClass)) {
XProtocolError e = new XProtocolError(Error.class.cast(message.getMessage()));
this.callbacks.onException(e);
return true; /* done reading? */
} else if (Frame.class.equals(msgClass)) {
this.okBuilder.addNotice(this.noticeFactory.createFromMessage(message));
return false; /* done reading? */
}
this.callbacks.onException(new WrongArgumentException("Unhandled msg class (" + msgClass + ") + msg=" + message.getMessage()));
return false; /* done reading? */ // note, this doesn't comply with the specified semantics ResultListener
}
public void error(Throwable ex) {
this.callbacks.onException(ex);
}
}