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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.

 */

#include "server/TThreadPoolServer.h"

#include "transport/TTransportException.h"

#include "concurrency/Thread.h"

#include "concurrency/ThreadManager.h"

#include <string>

#include <iostream>

namespace apache { namespace thrift { namespace server {

using boost::shared_ptr;

using namespace std;

using namespace apache::thrift;

using namespace apache::thrift::concurrency;

using namespace apache::thrift::protocol;;

using namespace apache::thrift::transport;

class TThreadPoolServer::Task : public Runnable {

public:

  Task(TThreadPoolServer &server,

       shared_ptr<TProcessor> processor,

       shared_ptr<TProtocol> input,

       shared_ptr<TProtocol> output) :

    server_(server),

    processor_(processor),

    input_(input),

    output_(output) {

  }

  ~Task() {}

  void run() {

    boost::shared_ptr<TServerEventHandler> eventHandler =

      server_.getEventHandler();

    if (eventHandler != NULL) {

      eventHandler->clientBegin(input_, output_);

    }

    try {

      while (processor_->process(input_, output_)) {

        if (!input_->getTransport()->peek()) {

          break;

        }

      }

    } catch (TTransportException& ttx) {

      // This is reasonably expected, client didn't send a full request so just

      // ignore him

      // string errStr = string("TThreadPoolServer client died: ") + ttx.what();

      // GlobalOutput(errStr.c_str());

    } catch (TException& x) {

      string errStr = string("TThreadPoolServer exception: ") + x.what();

      GlobalOutput(errStr.c_str());

    } catch (std::exception &x) {

      string errStr = string("TThreadPoolServer, std::exception: ") + x.what();

      GlobalOutput(errStr.c_str());

    }

    if (eventHandler != NULL) {

      eventHandler->clientEnd(input_, output_);

    }

    try {

      input_->getTransport()->close();

    } catch (TTransportException& ttx) {

      string errStr = string("TThreadPoolServer input close failed: ") + ttx.what();

      GlobalOutput(errStr.c_str());

    }

    try {

      output_->getTransport()->close();

    } catch (TTransportException& ttx) {

      string errStr = string("TThreadPoolServer output close failed: ") + ttx.what();

      GlobalOutput(errStr.c_str());

    }

  }

 private:

  TServer& server_;

  shared_ptr<TProcessor> processor_;

  shared_ptr<TProtocol> input_;

  shared_ptr<TProtocol> output_;

};

TThreadPoolServer::TThreadPoolServer(shared_ptr<TProcessor> processor,

                                     shared_ptr<TServerTransport> serverTransport,

                                     shared_ptr<TTransportFactory> transportFactory,

                                     shared_ptr<TProtocolFactory> protocolFactory,

                                     shared_ptr<ThreadManager> threadManager) :

  TServer(processor, serverTransport, transportFactory, protocolFactory),

  threadManager_(threadManager),

  stop_(false), timeout_(0) {}

TThreadPoolServer::TThreadPoolServer(shared_ptr<TProcessor> processor,

                                     shared_ptr<TServerTransport> serverTransport,

                                     shared_ptr<TTransportFactory> inputTransportFactory,

                                     shared_ptr<TTransportFactory> outputTransportFactory,

                                     shared_ptr<TProtocolFactory> inputProtocolFactory,

                                     shared_ptr<TProtocolFactory> outputProtocolFactory,

                                     shared_ptr<ThreadManager> threadManager) :

  TServer(processor, serverTransport, inputTransportFactory, outputTransportFactory,

          inputProtocolFactory, outputProtocolFactory),

  threadManager_(threadManager),

  stop_(false), timeout_(0) {}

TThreadPoolServer::~TThreadPoolServer() {}

void TThreadPoolServer::serve() {

  shared_ptr<TTransport> client;

  shared_ptr<TTransport> inputTransport;

  shared_ptr<TTransport> outputTransport;

  shared_ptr<TProtocol> inputProtocol;

  shared_ptr<TProtocol> outputProtocol;

  try {

    // Start the server listening

    serverTransport_->listen();

  } catch (TTransportException& ttx) {

    string errStr = string("TThreadPoolServer::run() listen(): ") + ttx.what();

    GlobalOutput(errStr.c_str());

    return;

  }

  // Run the preServe event

  if (eventHandler_ != NULL) {

    eventHandler_->preServe();

  }

  while (!stop_) {

    try {

      client.reset();

      inputTransport.reset();

      outputTransport.reset();

      inputProtocol.reset();

      outputProtocol.reset();

      // Fetch client from server

      client = serverTransport_->accept();

      // Make IO transports

      inputTransport = inputTransportFactory_->getTransport(client);

      outputTransport = outputTransportFactory_->getTransport(client);

      inputProtocol = inputProtocolFactory_->getProtocol(inputTransport);

      outputProtocol = outputProtocolFactory_->getProtocol(outputTransport);

      // Add to threadmanager pool

      threadManager_->add(shared_ptr<TThreadPoolServer::Task>(new TThreadPoolServer::Task(*this, processor_, inputProtocol, outputProtocol)), timeout_);

    } catch (TTransportException& ttx) {

      if (inputTransport != NULL) { inputTransport->close(); }

      if (outputTransport != NULL) { outputTransport->close(); }

      if (client != NULL) { client->close(); }

      if (!stop_ || ttx.getType() != TTransportException::INTERRUPTED) {

        string errStr = string("TThreadPoolServer: TServerTransport died on accept: ") + ttx.what();

        GlobalOutput(errStr.c_str());

      }

      continue;

    } catch (TException& tx) {

      if (inputTransport != NULL) { inputTransport->close(); }

      if (outputTransport != NULL) { outputTransport->close(); }

      if (client != NULL) { client->close(); }

      string errStr = string("TThreadPoolServer: Caught TException: ") + tx.what();

      GlobalOutput(errStr.c_str());

      continue;

    } catch (string s) {

      if (inputTransport != NULL) { inputTransport->close(); }

      if (outputTransport != NULL) { outputTransport->close(); }

      if (client != NULL) { client->close(); }

      string errStr = "TThreadPoolServer: Unknown exception: " + s;

      GlobalOutput(errStr.c_str());

      break;

    }

  }

  // If stopped manually, join the existing threads

  if (stop_) {

    try {

      serverTransport_->close();

      threadManager_->join();

    } catch (TException &tx) {

      string errStr = string("TThreadPoolServer: Exception shutting down: ") + tx.what();

      GlobalOutput(errStr.c_str());

    }

    stop_ = false;

  }

}

int64_t TThreadPoolServer::getTimeout() const {

  return timeout_;

}

void TThreadPoolServer::setTimeout(int64_t value) {

  timeout_ = value;

}

}}} // apache::thrift::server