content: /*
   * 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<XMessage>, 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<Long, Void> 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;
      }
  }
  