| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| using System; |
| using Apache.NMS.ActiveMQ.Commands; |
| using Apache.NMS.ActiveMQ.OpenWire; |
| using Apache.NMS.Util; |
| |
| namespace Apache.NMS.ActiveMQ.Transport |
| { |
| /// <summary> |
| /// A Transport which negotiates the wire format |
| /// </summary> |
| public class WireFormatNegotiator : TransportFilter |
| { |
| private readonly OpenWireFormat wireFormat; |
| private readonly TimeSpan negotiateTimeout = TimeSpan.FromSeconds(15); |
| |
| private readonly Atomic<bool> firstStart=new Atomic<bool>(true); |
| private readonly CountDownLatch readyCountDownLatch = new CountDownLatch(1); |
| private readonly CountDownLatch wireInfoSentDownLatch = new CountDownLatch(1); |
| |
| public WireFormatNegotiator(ITransport next, OpenWireFormat wireFormat) |
| : base(next) |
| { |
| this.wireFormat = wireFormat; |
| } |
| |
| public override void Start() |
| { |
| base.Start(); |
| if (firstStart.CompareAndSet(true, false)) |
| { |
| try |
| { |
| next.Oneway(wireFormat.PreferredWireFormatInfo); |
| } |
| finally |
| { |
| wireInfoSentDownLatch.countDown(); |
| } |
| } |
| } |
| |
| protected override void Dispose(bool disposing) |
| { |
| base.Dispose(disposing); |
| readyCountDownLatch.countDown(); |
| } |
| |
| public override void Oneway(Command command) |
| { |
| if (!readyCountDownLatch.await(negotiateTimeout)) |
| throw new IOException("Wire format negotiation timeout: peer did not send his wire format."); |
| next.Oneway(command); |
| } |
| |
| protected override void OnCommand(ITransport sender, Command command) |
| { |
| if ( command.IsWireFormatInfo ) |
| { |
| WireFormatInfo info = (WireFormatInfo)command; |
| try |
| { |
| if (!info.Valid) |
| { |
| throw new IOException("Remote wire format magic is invalid"); |
| } |
| wireInfoSentDownLatch.await(negotiateTimeout); |
| wireFormat.RenegotiateWireFormat(info); |
| } |
| catch (Exception e) |
| { |
| OnException(this, e); |
| } |
| finally |
| { |
| readyCountDownLatch.countDown(); |
| } |
| } |
| this.commandHandler(sender, command); |
| } |
| |
| protected override void OnException(ITransport sender, Exception command) |
| { |
| readyCountDownLatch.countDown(); |
| this.exceptionHandler(sender, command); |
| } |
| } |
| } |
| |