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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.
*
*/
package org.apache.qpid.transport.network;
import org.apache.qpid.transport.Header;
import org.apache.qpid.transport.Method;
import org.apache.qpid.transport.ProtocolDelegate;
import org.apache.qpid.transport.ProtocolError;
import org.apache.qpid.transport.ProtocolEvent;
import org.apache.qpid.transport.ProtocolHeader;
import org.apache.qpid.transport.SegmentType;
import org.apache.qpid.transport.Sender;
import org.apache.qpid.transport.Struct;
import org.apache.qpid.transport.codec.BBEncoder;
import static org.apache.qpid.transport.network.Frame.FIRST_FRAME;
import static org.apache.qpid.transport.network.Frame.FIRST_SEG;
import static org.apache.qpid.transport.network.Frame.HEADER_SIZE;
import static org.apache.qpid.transport.network.Frame.LAST_FRAME;
import static org.apache.qpid.transport.network.Frame.LAST_SEG;
import static java.lang.Math.min;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
/**
* Disassembler
*/
public final class Disassembler implements Sender<ProtocolEvent>, ProtocolDelegate<Void>
{
private final Sender<ByteBuffer> sender;
private final int maxPayload;
private final Object sendlock = new Object();
private final static ThreadLocal<BBEncoder> _encoder = new ThreadLocal<BBEncoder>()
{
public BBEncoder initialValue()
{
return new BBEncoder(4*1024);
}
};
public Disassembler(Sender<ByteBuffer> sender, int maxFrame)
{
if (maxFrame <= HEADER_SIZE || maxFrame >= 64*1024)
{
throw new IllegalArgumentException("maxFrame must be > HEADER_SIZE and < 64K: " + maxFrame);
}
this.sender = sender;
this.maxPayload = maxFrame - HEADER_SIZE;
}
public void send(ProtocolEvent event)
{
event.delegate(null, this);
}
public void flush()
{
synchronized (sendlock)
{
sender.flush();
}
}
public void close()
{
synchronized (sendlock)
{
sender.close();
}
}
private void frame(byte flags, byte type, byte track, int channel, int size, ByteBuffer buf)
{
synchronized (sendlock)
{
ByteBuffer data = ByteBuffer.allocate(size + HEADER_SIZE);
data.order(ByteOrder.BIG_ENDIAN);
data.put(0, flags);
data.put(1, type);
data.putShort(2, (short) (size + HEADER_SIZE));
data.put(5, track);
data.putShort(6, (short) channel);
data.position(HEADER_SIZE);
int limit = buf.limit();
buf.limit(buf.position() + size);
data.put(buf);
buf.limit(limit);
data.rewind();
sender.send(data);
}
}
private void fragment(byte flags, SegmentType type, ProtocolEvent event, ByteBuffer buf)
{
byte typeb = (byte) type.getValue();
byte track = event.getEncodedTrack() == Frame.L4 ? (byte) 1 : (byte) 0;
int remaining = buf.remaining();
boolean first = true;
while (true)
{
int size = min(maxPayload, remaining);
remaining -= size;
byte newflags = flags;
if (first)
{
newflags |= FIRST_FRAME;
first = false;
}
if (remaining == 0)
{
newflags |= LAST_FRAME;
}
frame(newflags, typeb, track, event.getChannel(), size, buf);
if (remaining == 0)
{
break;
}
}
}
public void init(Void v, ProtocolHeader header)
{
synchronized (sendlock)
{
sender.send(header.toByteBuffer());
sender.flush();
}
}
public void control(Void v, Method method)
{
method(method, SegmentType.CONTROL);
}
public void command(Void v, Method method)
{
method(method, SegmentType.COMMAND);
}
private void method(Method method, SegmentType type)
{
BBEncoder enc = _encoder.get();
enc.init();
enc.writeUint16(method.getEncodedType());
if (type == SegmentType.COMMAND)
{
if (method.isSync())
{
enc.writeUint16(0x0101);
}
else
{
enc.writeUint16(0x0100);
}
}
method.write(enc);
ByteBuffer methodSeg = enc.segment();
byte flags = FIRST_SEG;
boolean payload = method.hasPayload();
if (!payload)
{
flags |= LAST_SEG;
}
ByteBuffer headerSeg = null;
if (payload)
{
final Header hdr = method.getHeader();
if (hdr != null)
{
final Struct[] structs = hdr.getStructs();
for (Struct st : structs)
{
enc.writeStruct32(st);
}
}
headerSeg = enc.segment();
}
synchronized (sendlock)
{
fragment(flags, type, method, methodSeg);
if (payload)
{
ByteBuffer body = method.getBody();
fragment(body == null ? LAST_SEG : 0x0, SegmentType.HEADER, method, headerSeg);
if (body != null)
{
fragment(LAST_SEG, SegmentType.BODY, method, body);
}
}
}
}
public void error(Void v, ProtocolError error)
{
throw new IllegalArgumentException(String.valueOf(error));
}
public void setIdleTimeout(int i)
{
sender.setIdleTimeout(i);
}
}
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