| /* |
| * |
| * 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.proton.engine.impl; |
| |
| import org.apache.qpid.proton.amqp.Binary; |
| import org.apache.qpid.proton.amqp.transport.EmptyFrame; |
| import org.apache.qpid.proton.amqp.transport.FrameBody; |
| import org.apache.qpid.proton.codec.EncoderImpl; |
| import org.apache.qpid.proton.codec.WritableBuffer; |
| import org.apache.qpid.proton.framing.TransportFrame; |
| |
| import java.nio.BufferOverflowException; |
| import java.nio.ByteBuffer; |
| |
| /** |
| * FrameWriter |
| * |
| */ |
| |
| class FrameWriter |
| { |
| |
| static final byte AMQP_FRAME_TYPE = 0; |
| static final byte SASL_FRAME_TYPE = (byte) 1; |
| |
| private EncoderImpl _encoder; |
| private ByteBuffer _bbuf; |
| private WritableBuffer _buffer; |
| private int _maxFrameSize; |
| private byte _frameType; |
| final private Ref<ProtocolTracer> _protocolTracer; |
| private TransportImpl _transport; |
| |
| private int _frameStart = 0; |
| private int _payloadStart; |
| private int _performativeSize; |
| private long _framesOutput = 0; |
| |
| FrameWriter(EncoderImpl encoder, int maxFrameSize, byte frameType, |
| Ref<ProtocolTracer> protocolTracer, TransportImpl transport) |
| { |
| _encoder = encoder; |
| _bbuf = ByteBuffer.allocate(1024); |
| _buffer = new WritableBuffer.ByteBufferWrapper(_bbuf); |
| _encoder.setByteBuffer(_buffer); |
| _maxFrameSize = maxFrameSize; |
| _frameType = frameType; |
| _protocolTracer = protocolTracer; |
| _transport = transport; |
| } |
| |
| void setMaxFrameSize(int maxFrameSize) |
| { |
| _maxFrameSize = maxFrameSize; |
| } |
| |
| private void grow() |
| { |
| grow(_bbuf.capacity()); // Double current capacity |
| } |
| |
| private void grow(int amount) |
| { |
| ByteBuffer old = _bbuf; |
| _bbuf = ByteBuffer.allocate(old.capacity() + amount); |
| _buffer = new WritableBuffer.ByteBufferWrapper(_bbuf); |
| old.flip(); |
| _bbuf.put(old); |
| _encoder.setByteBuffer(_buffer); |
| } |
| |
| void writeHeader(byte[] header) |
| { |
| _buffer.put(header, 0, header.length); |
| } |
| |
| private void startFrame() |
| { |
| _frameStart = _buffer.position(); |
| } |
| |
| private void writePerformative(Object frameBody) |
| { |
| while (_buffer.remaining() < 8) { |
| grow(); |
| } |
| |
| while (true) |
| { |
| try |
| { |
| _buffer.position(_frameStart + 8); |
| if (frameBody != null) _encoder.writeObject(frameBody); |
| break; |
| } |
| catch (BufferOverflowException e) |
| { |
| grow(); |
| } |
| } |
| |
| _payloadStart = _buffer.position(); |
| _performativeSize = _payloadStart - _frameStart; |
| } |
| |
| private void endFrame(int channel) |
| { |
| int frameSize = _buffer.position() - _frameStart; |
| int limit = _buffer.position(); |
| _buffer.position(_frameStart); |
| _buffer.putInt(frameSize); |
| _buffer.put((byte) 2); |
| _buffer.put(_frameType); |
| _buffer.putShort((short) channel); |
| _buffer.position(limit); |
| } |
| |
| void writeFrame(int channel, Object frameBody, ByteBuffer payload, |
| Runnable onPayloadTooLarge) |
| { |
| startFrame(); |
| |
| writePerformative(frameBody); |
| |
| if(_maxFrameSize > 0 && payload != null && (payload.remaining() + _performativeSize) > _maxFrameSize) |
| { |
| if(onPayloadTooLarge != null) |
| { |
| onPayloadTooLarge.run(); |
| } |
| writePerformative(frameBody); |
| } |
| |
| int capacity; |
| if (_maxFrameSize > 0) { |
| capacity = _maxFrameSize - _performativeSize; |
| } else { |
| capacity = Integer.MAX_VALUE; |
| } |
| int payloadSize = Math.min(payload == null ? 0 : payload.remaining(), capacity); |
| |
| ProtocolTracer tracer = _protocolTracer == null ? null : _protocolTracer.get(); |
| if( tracer != null || _transport.isTraceFramesEnabled()) |
| { |
| // XXX: this is a bit of a hack but it eliminates duplicate |
| // code, further refactor will fix this |
| if (_frameType == AMQP_FRAME_TYPE) |
| { |
| ByteBuffer originalPayload = null; |
| if( payload!=null ) |
| { |
| originalPayload = payload.duplicate(); |
| originalPayload.limit(payload.position() + payloadSize); |
| } |
| |
| Binary payloadBin = Binary.create(originalPayload); |
| FrameBody body = null; |
| if (frameBody == null) |
| { |
| body = new EmptyFrame(); |
| } |
| else |
| { |
| body = (FrameBody) frameBody; |
| } |
| |
| TransportFrame frame = new TransportFrame(channel, body, payloadBin); |
| |
| _transport.log(TransportImpl.OUTGOING, frame); |
| |
| if(tracer != null) |
| { |
| tracer.sentFrame(frame); |
| } |
| } |
| } |
| |
| if(payloadSize > 0) |
| { |
| while (_buffer.remaining() < payloadSize) |
| { |
| grow(payloadSize - _buffer.remaining()); |
| } |
| |
| int oldLimit = payload.limit(); |
| payload.limit(payload.position() + payloadSize); |
| _buffer.put(payload); |
| payload.limit(oldLimit); |
| } |
| |
| endFrame(channel); |
| |
| _framesOutput += 1; |
| } |
| |
| void writeFrame(Object frameBody) |
| { |
| writeFrame(0, frameBody, null, null); |
| } |
| |
| boolean isFull() { |
| // XXX: this should probably be tunable |
| return _bbuf.position() > 64*1024; |
| } |
| |
| int readBytes(ByteBuffer dst) |
| { |
| ByteBuffer src = _bbuf.duplicate(); |
| src.flip(); |
| |
| int size = Math.min(src.remaining(), dst.remaining()); |
| int limit = src.limit(); |
| src.limit(size); |
| dst.put(src); |
| src.limit(limit); |
| _bbuf.rewind(); |
| _bbuf.put(src); |
| |
| return size; |
| } |
| |
| long getFramesOutput() |
| { |
| return _framesOutput; |
| } |
| } |