com.mysql.cj.protocol.x.SyncMessageSender Maven / Gradle / Ivy
/*
* Copyright (c) 2015, 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.protocol.x;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.CompletionHandler;
import java.util.concurrent.CompletableFuture;
import com.google.protobuf.MessageLite;
import com.mysql.cj.Messages;
import com.mysql.cj.exceptions.CJCommunicationsException;
import com.mysql.cj.exceptions.CJPacketTooBigException;
import com.mysql.cj.protocol.MessageSender;
import com.mysql.cj.protocol.PacketSentTimeHolder;
/**
* Synchronous-only implementation of {@link MessageSender}.
*/
public class SyncMessageSender implements MessageSender, PacketSentTimeHolder {
/**
* Header length of X Protocol packet.
*/
static final int HEADER_LEN = 5;
private OutputStream outputStream;
private long lastPacketSentTime = 0;
private long previousPacketSentTime = 0;
private int maxAllowedPacket = -1;
/** Lock to protect async writes from sync ones. */
Object waitingAsyncOperationMonitor = new Object();
public SyncMessageSender(OutputStream os) {
this.outputStream = os;
}
public void send(XMessage message) {
synchronized (this.waitingAsyncOperationMonitor) {
MessageLite msg = message.getMessage();
try {
int type = MessageConstants.getTypeForMessageClass(msg.getClass());
int size = 1 + msg.getSerializedSize();
if (this.maxAllowedPacket > 0 && size > this.maxAllowedPacket) {
throw new CJPacketTooBigException(Messages.getString("PacketTooBigException.1", new Object[] { size, this.maxAllowedPacket }));
}
// for debugging
// System.err.println("Initiating write of message (size=" + size + ", tag=" + ClientMessages.Type.valueOf(type) + ")");
byte[] sizeHeader = ByteBuffer.allocate(4).order(ByteOrder.LITTLE_ENDIAN).putInt(size).array();
this.outputStream.write(sizeHeader);
this.outputStream.write(type);
msg.writeTo(this.outputStream);
this.outputStream.flush();
this.previousPacketSentTime = this.lastPacketSentTime;
this.lastPacketSentTime = System.currentTimeMillis();
} catch (IOException ex) {
throw new CJCommunicationsException("Unable to write message", ex);
}
}
}
@Override
public CompletableFuture send(XMessage message, CompletableFuture future, Runnable callback) {
synchronized (this.waitingAsyncOperationMonitor) {
CompletionHandler resultHandler = new ErrorToFutureCompletionHandler<>(future, callback);
MessageLite msg = message.getMessage();
try {
send(message);
long result = 4 + 1 + msg.getSerializedSize();
resultHandler.completed(result, null);
} catch (Throwable t) {
resultHandler.failed(t, null);
}
return future;
}
}
public long getLastPacketSentTime() {
return this.lastPacketSentTime;
}
@Override
public long getPreviousPacketSentTime() {
return this.previousPacketSentTime;
}
public void setMaxAllowedPacket(int maxAllowedPacket) {
this.maxAllowedPacket = maxAllowedPacket;
}
}