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Merge pull request #1 from nats-io/add_cs_client
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Initial NATS C# Client (Alpha)
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Colin Sullivan committed Nov 5, 2015
2 parents 2710a01 + 2eb4ccd commit f89c30b
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20 changes: 20 additions & 0 deletions LICENSE
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The MIT License (MIT)

Copyright (c) 2012-2015 Apcera Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
56 changes: 56 additions & 0 deletions NATS.sln
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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Express 2012 for Windows Desktop
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EndProject
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142 changes: 142 additions & 0 deletions NATS/AsyncSub.cs
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// Copyright 2015 Apcera Inc. All rights reserved.

using System;
using System.Threading;
using System.Threading.Tasks;

// disable XML comment warnings
#pragma warning disable 1591

namespace NATS.Client
{
/// <summary>
/// An object of this class is an asynchronous subscription representing interest
/// in a subject. The subject can have wildcards (partial:*, full:>).
/// Messages will be delivered to the associated MsgHandler event delegates.
/// While nothing prevents event handlers from being added or
/// removed while processing messages, no messages will be received until
/// Start() has been called. This allows all event handlers to be added
/// before message processing begins.
/// </summary>
/// <remarks><see cref="MsgHandler">See MsgHandler</see>.</remarks>
public sealed class AsyncSubscription : Subscription, IAsyncSubscription, ISubscription
{

public MsgHandler msgHandler = null;
private MsgHandlerEventArgs msgHandlerArgs = new MsgHandlerEventArgs();
private Task msgFeeder = null;

internal AsyncSubscription(Connection conn, string subject, string queue)
: base(conn, subject, queue) { }

internal protected override bool processMsg(Msg msg)
{
Connection c;
MsgHandler handler;
long max;

lock (mu)
{
c = this.conn;
handler = this.msgHandler;
max = this.max;
}

// the message handler has not been setup yet, drop the
// message.
if (msgHandler == null)
return true;

if (conn == null)
return false;

long d = Interlocked.Increment(ref delivered);
if (max <= 0 || d <= max)
{
msgHandlerArgs.msg = msg;
try
{
msgHandler(this, msgHandlerArgs);
}
catch (Exception) { }

if (d == max)
{
Unsubscribe();
this.conn = null;
}
}

return true;
}

internal bool isStarted()
{
return (msgFeeder != null);
}

internal void enableAsyncProcessing()
{
if (msgFeeder == null)
{
msgFeeder = new Task(() => { conn.deliverMsgs(mch); });
msgFeeder.Start();
}
}

internal void disableAsyncProcessing()
{
if (msgFeeder != null)
{
mch.close();
msgFeeder = null;
}
}

/// <summary>
/// Adds or removes a message handler to this subscriber.
/// </summary>
/// <remarks><see cref="MsgHandler">See MsgHandler</see></remarks>
public event MsgHandler MessageHandler
{
add
{
msgHandler += value;
}
remove
{
msgHandler -= value;
}
}

/// <summary>
/// This completes the subsciption process notifying the server this subscriber
/// has interest.
/// </summary>
public void Start()
{
if (isStarted())
return;

if (conn == null)
throw new NATSBadSubscriptionException();

conn.sendSubscriptonMessage(this);
enableAsyncProcessing();
}

override public void Unsubscribe()
{
disableAsyncProcessing();
base.Unsubscribe();
}

public override void AutoUnsubscribe(int max)
{
if (!isStarted())
Start();

base.AutoUnsubscribe(max);
}
}
}
104 changes: 104 additions & 0 deletions NATS/Channel.cs
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// Copyright 2015 Apcera Inc. All rights reserved.

using System;
using System.Collections.Generic;
using System.Collections.Concurrent;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace NATS.Client
{
// Roll our own Channels - Concurrent Bag is more heavyweight
// than we need.
internal sealed class Channel<T>
{
Queue<T> q;
Object qLock = new Object();
bool finished = false;

internal Channel()
{
q = new Queue<T>(1024);
}

internal Channel(int initialCapacity)
{
q = new Queue<T>(initialCapacity);
}

internal T get(int timeout)
{
lock (qLock)
{
if (finished)
return default(T);

if (q.Count > 0)
{
return q.Dequeue();
}
else
{
if (timeout < 0)
{
Monitor.Wait(qLock);
}
else
{
if (Monitor.Wait(qLock, timeout) == false)
{
throw new NATSTimeoutException();
}
}

// we waited..
if (finished)
return default(T);

return q.Dequeue();
}
}

} // get

internal void add(T item)
{
lock (qLock)
{
q.Enqueue(item);

// if the queue count was previously zero, we were
// waiting, so signal.
if (q.Count <= 1)
{
Monitor.Pulse(qLock);
}
}
}

internal void close()
{
lock (qLock)
{
finished = true;
Monitor.Pulse(qLock);
}
}

internal int Count
{
get
{
lock (qLock)
{
return q.Count;
}
}
}

} // class Channel

}

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