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/*
*
* 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 System.Collections;
using log4net;
using Apache.Qpid.Buffer;
using Apache.Qpid.Codec;
using Apache.Qpid.Codec.Support;
using Apache.Qpid.Framing;
namespace Apache.Qpid.Client.Transport
{
public class AmqpChannel : IProtocolChannel
{
// Warning: don't use this log for regular logging.
static readonly ILog _protocolTraceLog = LogManager.GetLogger("TRACE.Qpid.Client.ProtocolChannel");
IByteChannel _byteChannel;
IProtocolEncoder _encoder;
IProtocolDecoder _decoder;
IProtocolDecoderOutput _decoderOutput;
private object _syncLock;
public AmqpChannel(IByteChannel byteChannel, IProtocolDecoderOutput decoderOutput)
{
_byteChannel = byteChannel;
_decoderOutput = decoderOutput;
_syncLock = new object();
AMQProtocolProvider protocolProvider = new AMQProtocolProvider();
IProtocolCodecFactory factory = protocolProvider.CodecFactory;
_encoder = factory.Encoder;
_decoder = factory.Decoder;
}
public void Read()
{
ByteBuffer buffer = _byteChannel.Read();
Decode(buffer);
}
public IAsyncResult BeginRead(AsyncCallback callback, object state)
{
return _byteChannel.BeginRead(callback, state);
}
public void EndRead(IAsyncResult result)
{
ByteBuffer buffer = _byteChannel.EndRead(result);
Decode(buffer);
}
public void Write(IDataBlock o)
{
// TODO: Refactor to decorator.
if (_protocolTraceLog.IsDebugEnabled)
{
_protocolTraceLog.Debug(String.Format("WRITE {0}", o));
}
// we should be doing an async write, but apparently
// the mentalis library doesn't queue async read/writes
// correctly and throws random IOException's. Stay sync for a while
//_byteChannel.BeginWrite(Encode(o), OnAsyncWriteDone, null);
_byteChannel.Write(Encode(o));
}
// not used for now
//private void OnAsyncWriteDone(IAsyncResult result)
//{
// _byteChannel.EndWrite(result);
//}
private void Decode(ByteBuffer buffer)
{
// make sure we don't try to decode more than
// one buffer at the same time
lock ( _syncLock )
{
_decoder.Decode(buffer, _decoderOutput);
}
}
private ByteBuffer Encode(object o)
{
SingleProtocolEncoderOutput output = new SingleProtocolEncoderOutput();
_encoder.Encode(o, output);
return output.buffer;
}
}
}
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