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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.
*/
using System;
using System.Threading;
using Thrift.Protocol;
using Thrift.Transport;
namespace Thrift.Server
{
/// <summary>
/// Server that uses C# built-in ThreadPool to spawn threads when handling requests
/// </summary>
public class TThreadPoolServer : TServer
{
private const int DEFAULT_MIN_THREADS = 10;
private const int DEFAULT_MAX_THREADS = 100;
private volatile bool stop = false;
public TThreadPoolServer(TProcessor processor, TServerTransport serverTransport)
:this(processor, serverTransport,
new TTransportFactory(), new TTransportFactory(),
new TBinaryProtocol.Factory(), new TBinaryProtocol.Factory(),
DEFAULT_MIN_THREADS, DEFAULT_MAX_THREADS, DefaultLogDelegate)
{
}
public TThreadPoolServer(TProcessor processor, TServerTransport serverTransport, LogDelegate logDelegate)
: this(processor, serverTransport,
new TTransportFactory(), new TTransportFactory(),
new TBinaryProtocol.Factory(), new TBinaryProtocol.Factory(),
DEFAULT_MIN_THREADS, DEFAULT_MAX_THREADS, logDelegate)
{
}
public TThreadPoolServer(TProcessor processor,
TServerTransport serverTransport,
TTransportFactory transportFactory,
TProtocolFactory protocolFactory)
:this(processor, serverTransport,
transportFactory, transportFactory,
protocolFactory, protocolFactory,
DEFAULT_MIN_THREADS, DEFAULT_MAX_THREADS, DefaultLogDelegate)
{
}
public TThreadPoolServer(TProcessor processor,
TServerTransport serverTransport,
TTransportFactory inputTransportFactory,
TTransportFactory outputTransportFactory,
TProtocolFactory inputProtocolFactory,
TProtocolFactory outputProtocolFactory,
int minThreadPoolThreads, int maxThreadPoolThreads, LogDelegate logDel)
:base(processor, serverTransport, inputTransportFactory, outputTransportFactory,
inputProtocolFactory, outputProtocolFactory, logDel)
{
if (!ThreadPool.SetMinThreads(minThreadPoolThreads, minThreadPoolThreads))
{
throw new Exception("Error: could not SetMinThreads in ThreadPool");
}
if (!ThreadPool.SetMaxThreads(maxThreadPoolThreads, maxThreadPoolThreads))
{
throw new Exception("Error: could not SetMaxThreads in ThreadPool");
}
}
/// <summary>
/// Use new ThreadPool thread for each new client connection
/// </summary>
public override void Serve()
{
try
{
serverTransport.Listen();
}
catch (TTransportException ttx)
{
logDelegate("Error, could not listen on ServerTransport: " + ttx);
return;
}
while (!stop)
{
int failureCount = 0;
try
{
TTransport client = serverTransport.Accept();
ThreadPool.QueueUserWorkItem(this.Execute, client);
}
catch (TTransportException ttx)
{
if (stop)
{
logDelegate("TThreadPoolServer was shutting down, caught " + ttx.GetType().Name);
}
else
{
++failureCount;
logDelegate(ttx.ToString());
}
}
}
if (stop)
{
try
{
serverTransport.Close();
}
catch (TTransportException ttx)
{
logDelegate("TServerTransport failed on close: " + ttx.Message);
}
stop = false;
}
}
/// <summary>
/// Loops on processing a client forever
/// threadContext will be a TTransport instance
/// </summary>
/// <param name="threadContext"></param>
private void Execute(Object threadContext)
{
TTransport client = (TTransport)threadContext;
TTransport inputTransport = null;
TTransport outputTransport = null;
TProtocol inputProtocol = null;
TProtocol outputProtocol = null;
try
{
inputTransport = inputTransportFactory.GetTransport(client);
outputTransport = outputTransportFactory.GetTransport(client);
inputProtocol = inputProtocolFactory.GetProtocol(inputTransport);
outputProtocol = outputProtocolFactory.GetProtocol(outputTransport);
while (processor.Process(inputProtocol, outputProtocol))
{
//keep processing requests until client disconnects
}
}
catch (TTransportException)
{
// Assume the client died and continue silently
//Console.WriteLine(ttx);
}
catch (Exception x)
{
logDelegate("Error: " + x);
}
if (inputTransport != null)
{
inputTransport.Close();
}
if (outputTransport != null)
{
outputTransport.Close();
}
}
public override void Stop()
{
stop = true;
serverTransport.Close();
}
}
}
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