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rocksdb/thrift/lib/cpp/async/THeaderAsyncChannel.h

137 lines
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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.
*/
#ifndef THRIFT_ASYNC_THEADERASYNCCHANNEL_H_
#define THRIFT_ASYNC_THEADERASYNCCHANNEL_H_ 1
#include "thrift/lib/cpp/async/TUnframedAsyncChannel.h"
namespace apache { namespace thrift { namespace async {
namespace detail {
/**
* A class to determine the end of a THeaderProtocol message. This is not as
* sophisticated as the logic in THeaderTransport, so it cannot yet handle any
* unframed transports, just THeader and TFramed. However, the previous
* implementation used TFramedAsyncChannel, so the limitation is not new.
*/
class THeaderACProtocolTraits {
public:
THeaderACProtocolTraits()
: maxMessageSize_(0x7ffffff) {}
// Methods required by TUnframedACReadState
bool getMessageLength(uint8_t* buffer,
uint32_t bufferLength,
uint32_t* messageLength);
void setMaxMessageSize(uint32_t maxMessageSize) {
maxMessageSize_ = maxMessageSize;
}
private:
uint32_t maxMessageSize_;
};
} // namespace detail
/**
* THeaderAsyncChannel
*
* This is a TAsyncChannel implementation that reads and writes
* messages encoded using THeaderProtocol.
*/
class THeaderAsyncChannel :
public TUnframedAsyncChannel<detail::THeaderACProtocolTraits> {
private:
typedef TUnframedAsyncChannel<detail::THeaderACProtocolTraits> Parent;
public:
explicit THeaderAsyncChannel(
const boost::shared_ptr<TAsyncTransport>& transport)
: Parent(transport) {}
/**
* Helper function to create a shared_ptr<THeaderAsyncChannel>.
*
* This passes in the correct destructor object, since THeaderAsyncChannel's
* destructor is protected and cannot be invoked directly.
*/
static boost::shared_ptr<THeaderAsyncChannel> newChannel(
const boost::shared_ptr<TAsyncTransport>& transport) {
return boost::shared_ptr<THeaderAsyncChannel>(
new THeaderAsyncChannel(transport), Destructor());
}
void setMaxMessageSize(uint32_t size) {
Parent::setMaxMessageSize(size);
readState_.getProtocolTraits()->setMaxMessageSize(size);
}
// Note that we inherit getMaxMessageSize() from TUnframedAsyncChannel.
protected:
/**
* Protected destructor.
*
* Users of THeaderAsyncChannel must never delete it directly. Instead,
* invoke destroy().
*/
virtual ~THeaderAsyncChannel() { }
};
class THeaderAsyncChannelFactory : public TStreamAsyncChannelFactory {
public:
THeaderAsyncChannelFactory()
: maxMessageSize_(0x7fffffff)
, recvTimeout_(0)
, sendTimeout_(0) {}
void setMaxMessageSize(uint32_t bytes) {
maxMessageSize_ = bytes;
}
void setRecvTimeout(uint32_t milliseconds) {
recvTimeout_ = milliseconds;
}
void setSendTimeout(uint32_t milliseconds) {
sendTimeout_ = milliseconds;
}
virtual boost::shared_ptr<TAsyncEventChannel> newChannel(
const boost::shared_ptr<TAsyncTransport>& transport) {
boost::shared_ptr<THeaderAsyncChannel> channel(
THeaderAsyncChannel::newChannel(transport));
transport->setSendTimeout(sendTimeout_);
channel->setMaxMessageSize(maxMessageSize_);
channel->setRecvTimeout(recvTimeout_);
return channel;
}
private:
uint32_t maxMessageSize_;
uint32_t recvTimeout_;
uint32_t sendTimeout_;
};
}}} // apache::thrift::async
#endif // THRIFT_ASYNC_THEADERASYNCCHANNEL_H_