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rocksdb/thrift/lib/cpp/server/TServer.h

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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_SERVER_TSERVER_H
#define THRIFT_SERVER_TSERVER_H 1
#include "thrift/lib/cpp/TProcessor.h"
#include "thrift/lib/cpp/transport/TServerTransport.h"
#include "thrift/lib/cpp/protocol/TBinaryProtocol.h"
#include "thrift/lib/cpp/concurrency/Thread.h"
#include "thrift/lib/cpp/util/shared_ptr_util.h"
namespace apache { namespace thrift {
namespace transport {
class TSocketAddress;
}
namespace server {
using apache::thrift::TProcessor;
using apache::thrift::protocol::TBinaryProtocolFactory;
using apache::thrift::protocol::TProtocol;
using apache::thrift::protocol::TProtocolFactory;
using apache::thrift::protocol::TDuplexProtocolFactory;
using apache::thrift::protocol::TDualProtocolFactory;
using apache::thrift::protocol::TSingleProtocolFactory;
using apache::thrift::transport::TServerTransport;
using apache::thrift::transport::TTransport;
using apache::thrift::transport::TTransportFactory;
using apache::thrift::transport::TDuplexTransportFactory;
using apache::thrift::transport::TDualTransportFactory;
using apache::thrift::transport::TSingleTransportFactory;
class TConnectionContext;
/**
* Virtual interface class that can handle events from the server core. To
* use this you should subclass it and implement the methods that you care
* about. Your subclass can also store local data that you may care about,
* such as additional "arguments" to these methods (stored in the object
* instance's state).
*/
class TServerEventHandler {
public:
virtual ~TServerEventHandler() {}
/**
* Called before the server begins.
*
* @param address The address on which the server is listening.
*/
virtual void preServe(const transport::TSocketAddress* address) {}
/**
* Called when a new client has connected and is about to being processing.
*
* @param ctx A pointer to the connection context. The context will remain
* valid until the corresponding connectionDestroyed() call.
*/
virtual void newConnection(TConnectionContext* ctx) {
(void)ctx;
}
/**
* Called when a client has finished request-handling to delete server
* context.
*
* @param ctx A pointer to the connection context. The context will be
* destroyed after connectionDestroyed() returns.
*/
virtual void connectionDestroyed(TConnectionContext* ctx) {
(void)ctx;
}
protected:
/**
* Prevent direct instantiation.
*/
TServerEventHandler() {}
};
/**
* Thrift server.
*
*/
class TServer : public concurrency::Runnable {
public:
virtual ~TServer() {}
virtual void serve() = 0;
virtual void stop() {}
// This API is intended to stop listening on the server
// socket and stop accepting new connection first while
// still letting the established connections to be
// processed on the server.
virtual void stopListening() {}
// Allows running the server as a Runnable thread
virtual void run() {
serve();
}
boost::shared_ptr<TProcessorFactory> getProcessorFactory() {
return processorFactory_;
}
boost::shared_ptr<TServerTransport> getServerTransport() {
return serverTransport_;
}
boost::shared_ptr<TDuplexTransportFactory> getDuplexTransportFactory() {
return duplexTransportFactory_;
}
boost::shared_ptr<TDuplexProtocolFactory> getDuplexProtocolFactory() {
return duplexProtocolFactory_;
}
boost::shared_ptr<TServerEventHandler> getEventHandler() {
return eventHandler_;
}
/**
* Get the TConnectionContext for the connection currently being processed.
*
* This is intended to be invoked from within the TProcessor (or the handler
* used by the TProcessor).
*
* Note: Not all server types currently support getConnectionContext(). Some
* servers may always return NULL.
*
* TODO: Eventually this method should be supported by all server types, and
* made into a pure virtual method.
*
* @return Return a pointer to the TConnectionContext for the current
* connection, or NULL if invoked outside of a call to
* TProcessor::process(). The returned object is only guaranteed to
* be valid until process() returns.
*/
virtual TConnectionContext* getConnectionContext() const {
return NULL;
}
protected:
template<typename ProcessorFactory>
TServer(const boost::shared_ptr<ProcessorFactory>& processorFactory,
THRIFT_OVERLOAD_IF(ProcessorFactory, TProcessorFactory)):
processorFactory_(processorFactory) {
setTransportFactory(boost::shared_ptr<TTransportFactory>(
new TTransportFactory()));
setProtocolFactory(boost::shared_ptr<TBinaryProtocolFactory>(
new TBinaryProtocolFactory()));
}
template<typename Processor>
TServer(const boost::shared_ptr<Processor>& processor,
THRIFT_OVERLOAD_IF(Processor, TProcessor)):
processorFactory_(new TSingletonProcessorFactory(processor)) {
setTransportFactory(boost::shared_ptr<TTransportFactory>(
new TTransportFactory()));
setProtocolFactory(boost::shared_ptr<TBinaryProtocolFactory>(
new TBinaryProtocolFactory()));
}
template<typename ProcessorFactory>
TServer(const boost::shared_ptr<ProcessorFactory>& processorFactory,
const boost::shared_ptr<TServerTransport>& serverTransport,
THRIFT_OVERLOAD_IF(ProcessorFactory, TProcessorFactory)):
processorFactory_(processorFactory),
serverTransport_(serverTransport) {
setTransportFactory(boost::shared_ptr<TTransportFactory>(
new TTransportFactory()));
setProtocolFactory(boost::shared_ptr<TBinaryProtocolFactory>(
new TBinaryProtocolFactory()));
}
template<typename Processor>
TServer(const boost::shared_ptr<Processor>& processor,
const boost::shared_ptr<TServerTransport>& serverTransport,
THRIFT_OVERLOAD_IF(Processor, TProcessor)):
processorFactory_(new TSingletonProcessorFactory(processor)),
serverTransport_(serverTransport) {
setTransportFactory(boost::shared_ptr<TTransportFactory>(
new TTransportFactory()));
setProtocolFactory(boost::shared_ptr<TBinaryProtocolFactory>(
new TBinaryProtocolFactory()));
}
template<typename ProcessorFactory>
TServer(const boost::shared_ptr<ProcessorFactory>& processorFactory,
const boost::shared_ptr<TServerTransport>& serverTransport,
const boost::shared_ptr<TTransportFactory>& transportFactory,
const boost::shared_ptr<TProtocolFactory>& protocolFactory,
THRIFT_OVERLOAD_IF(ProcessorFactory, TProcessorFactory)):
processorFactory_(processorFactory),
serverTransport_(serverTransport) {
setTransportFactory(transportFactory);
setProtocolFactory(protocolFactory);
}
template<typename Processor>
TServer(const boost::shared_ptr<Processor>& processor,
const boost::shared_ptr<TServerTransport>& serverTransport,
const boost::shared_ptr<TTransportFactory>& transportFactory,
const boost::shared_ptr<TProtocolFactory>& protocolFactory,
THRIFT_OVERLOAD_IF(Processor, TProcessor)):
processorFactory_(new TSingletonProcessorFactory(processor)),
serverTransport_(serverTransport) {
setTransportFactory(transportFactory);
setProtocolFactory(protocolFactory);
}
template<typename ProcessorFactory>
TServer(
const boost::shared_ptr<ProcessorFactory>& processorFactory,
const boost::shared_ptr<TServerTransport>& serverTransport,
const boost::shared_ptr<TDuplexTransportFactory>& duplexTransportFactory,
const boost::shared_ptr<TDuplexProtocolFactory>& duplexProtocolFactory,
THRIFT_OVERLOAD_IF(ProcessorFactory, TProcessorFactory)) :
processorFactory_(processorFactory),
serverTransport_(serverTransport),
duplexTransportFactory_(duplexTransportFactory),
duplexProtocolFactory_(duplexProtocolFactory) {}
template<typename Processor>
TServer(
const boost::shared_ptr<Processor>& processor,
const boost::shared_ptr<TServerTransport>& serverTransport,
const boost::shared_ptr<TDuplexTransportFactory>& duplexTransportFactory,
const boost::shared_ptr<TDuplexProtocolFactory>& duplexProtocolFactory,
THRIFT_OVERLOAD_IF(Processor, TProcessor)) :
processorFactory_(new TSingletonProcessorFactory(processor)),
serverTransport_(serverTransport),
duplexTransportFactory_(duplexTransportFactory),
duplexProtocolFactory_(duplexProtocolFactory) {}
/**
* Get a TProcessor to handle calls on a particular connection.
*
* This method should only be called once per connection (never once per
* call). This allows the TProcessorFactory to return a different processor
* for each connection if it desires.
*/
boost::shared_ptr<TProcessor> getProcessor(TConnectionContext* ctx) {
return processorFactory_->getProcessor(ctx);
}
// Class variables
boost::shared_ptr<TProcessorFactory> processorFactory_;
boost::shared_ptr<TServerTransport> serverTransport_;
boost::shared_ptr<TDuplexTransportFactory> duplexTransportFactory_;
boost::shared_ptr<TDuplexProtocolFactory> duplexProtocolFactory_;
boost::shared_ptr<TServerEventHandler> eventHandler_;
public:
void setProcessorFactory(
boost::shared_ptr<TProcessorFactory> processorFactory) {
processorFactory_ = processorFactory;
}
void setTransportFactory(
boost::shared_ptr<TTransportFactory> transportFactory) {
duplexTransportFactory_.reset(
new TSingleTransportFactory<TTransportFactory>(transportFactory));
}
void setDuplexTransportFactory(
boost::shared_ptr<TDuplexTransportFactory> duplexTransportFactory) {
duplexTransportFactory_ = duplexTransportFactory;
}
void setProtocolFactory(boost::shared_ptr<TProtocolFactory> protocolFactory) {
duplexProtocolFactory_.reset(
new TSingleProtocolFactory<TProtocolFactory>(protocolFactory));
}
void setDuplexProtocolFactory(
boost::shared_ptr<TDuplexProtocolFactory> duplexProtocolFactory) {
duplexProtocolFactory_ = duplexProtocolFactory;
}
void setServerEventHandler(
boost::shared_ptr<TServerEventHandler> eventHandler) {
eventHandler_ = eventHandler;
}
};
/**
* Helper function to increase the max file descriptors limit
* for the current process and all of its children.
* By default, tries to increase it to as much as 2^24.
*/
int increase_max_fds(int max_fds=(1<<24));
}}} // apache::thrift::server
#endif // #ifndef THRIFT_SERVER_TSERVER_H