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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_TEST_SERVERTHREAD_TCC_
#define _THRIFT_TEST_SERVERTHREAD_TCC_ 1
#include "ServerThread.h"
#include <thrift/concurrency/ThreadFactory.h>
#include <thrift/concurrency/ThreadManager.h>
#include <thrift/server/TThreadPoolServer.h>
#include <thrift/transport/TBufferTransports.h>
#include <thrift/transport/TServerSocket.h>
namespace apache {
namespace thrift {
namespace test {
void ServerThread::start() {
assert(!running_);
running_ = true;
helper_.reset(new Helper(this));
// Start the other thread
concurrency::ThreadFactory threadFactory;
threadFactory.setDetached(false);
thread_ = threadFactory.newThread(helper_);
thread_->start();
// Wait on the other thread to tell us that it has successfully
// bound to the port and started listening (or until an error occurs).
concurrency::Synchronized s(serverMonitor_);
while (!serving_ && !error_) {
serverMonitor_.waitForever();
}
if (error_) {
throw transport::TTransportException(transport::TTransportException::NOT_OPEN,
"failed to bind on server socket");
}
}
void ServerThread::stop() {
if (!running_) {
return;
}
// Tell the server to stop
server_->stop();
running_ = false;
// Wait for the server thread to exit
//
// Note: this only works if all client connections have closed. The servers
// generally wait for everything to be closed before exiting; there currently
// isn't a way to tell them to just exit now, and shut down existing
// connections.
thread_->join();
}
void ServerThread::run() {
/*
* Try binding to several ports, in case the one we want is already in use.
*/
port_ = 12345;
unsigned int maxRetries = 10;
for (unsigned int n = 0; n < maxRetries; ++n) {
// Create the server
server_ = serverState_->createServer(port_);
// Install our helper as the server event handler, so that our
// preServe() method will be called once we've successfully bound to
// the port and are about to start listening.
server_->setServerEventHandler(helper_);
try {
// Try to serve requests
server_->serve();
} catch (const TException&) {
// TNonblockingServer throws a generic TException if it fails to bind.
// If we get a TException, we'll optimistically assume the bind failed.
++port_;
continue;
}
// Seriously? serve() is pretty lame. If it fails to start serving it
// just returns rather than throwing an exception.
//
// We have to use our preServe() hook to tell if serve() successfully
// started serving and is returning because stop() is called, or if it just
// failed to start serving in the first place.
concurrency::Synchronized s(serverMonitor_);
if (serving_) {
// Oh good, we started serving and are exiting because
// we're trying to stop.
serving_ = false;
return;
} else {
// We never started serving, probably because we failed to bind to the
// port. Increment the port number and try again.
++port_;
continue;
}
}
// We failed to bind on any port.
concurrency::Synchronized s(serverMonitor_);
error_ = true;
serverMonitor_.notify();
}
void ServerThread::preServe() {
// We bound to the port successfully, and are about to start serving requests
serverState_->bindSuccessful(port_);
// Set the real server event handler (replacing ourself)
std::shared_ptr<server::TServerEventHandler> serverEventHandler
= serverState_->getServerEventHandler();
server_->setServerEventHandler(serverEventHandler);
// Notify the main thread that we have successfully started serving requests
concurrency::Synchronized s(serverMonitor_);
serving_ = true;
serverMonitor_.notify();
// Invoke preServe() on the real event handler, since we ate
// the original preServe() event.
if (serverEventHandler) {
serverEventHandler->preServe();
}
}
}
}
} // apache::thrift::test
#endif // _THRIFT_TEST_SERVERTHREAD_TCC_
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