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using System;
using System.Collections.Generic;
using System.Threading;
namespace common
{
public class AsynchronousCommandProcessor : CommandProcessor
{
readonly Queue<Command> queued_commands;
readonly EventWaitHandle manual_reset;
readonly IList<Thread> worker_threads;
bool keep_working;
static readonly Command Empty = new EmptyCommand();
public AsynchronousCommandProcessor()
{
queued_commands = new Queue<Command>();
worker_threads = new List<Thread>();
manual_reset = new ManualResetEvent(false);
}
public void add(Command command_to_process)
{
lock (queued_commands)
{
if (queued_commands.Contains(command_to_process)) return;
queued_commands.Enqueue(command_to_process);
reset_thread();
}
}
public void run()
{
reset_thread();
keep_working = true;
var worker_thread = new Thread(run_commands);
worker_thread.SetApartmentState(ApartmentState.STA);
worker_threads.Add(worker_thread);
worker_thread.Start();
}
public void stop()
{
keep_working = false;
manual_reset.Set();
//manual_reset.Close();
}
[STAThread]
void run_commands()
{
while (keep_working)
{
manual_reset.WaitOne();
run_next_command();
}
}
void run_next_command()
{
var command = Empty;
within_lock(() =>
{
if (queued_commands.Count == 0)
manual_reset.Reset();
else
command = queued_commands.Dequeue();
});
safely_invoke(() =>
{
command.run();
});
reset_thread();
}
void safely_invoke(Action action)
{
try
{
action();
}
catch (Exception e)
{
e.add_to_log();
}
}
void reset_thread()
{
within_lock(() =>
{
if (queued_commands.Count > 0) manual_reset.Set();
else manual_reset.Reset();
});
}
void within_lock(Action action)
{
lock (queued_commands)
{
action();
}
}
}
}
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