public ChannelPurger(IMessageSelector selector, params IPollableChannel[] channels)
{
AssertUtils.ArgumentHasElements(channels, "channel");
if(channels.Length == 1) {
if (channels[0] == null)
throw new ArgumentException("channel must not be null");
}
_selector = selector;
_channels = channels;
}
/// <summary>
/// Remove and return any messages that are stored for the current thread
/// and do not match the provided <paramref name="selector"/>.
/// </summary>
/// <param name="selector">the message selector</param>
/// <returns>the removed messages</returns>
public override IList<IMessage> Purge(IMessageSelector selector)
{
IList<IMessage> removedMessages = new List<IMessage>();
IMessage[] allMessages = _queue.ToArray();
foreach(IMessage message in allMessages) {
if(!selector.Accept(message) && _queue.Remove(message)) {
removedMessages.Add(message);
}
}
return removedMessages;
}
/// <summary>
/// Create a MessageFilter that will delegate to the given
/// </summary>
/// <param name="selector"></param>
public MessageFilter(IMessageSelector selector)
{
AssertUtils.ArgumentNotNull(selector, "selector must not be null");
_selector = selector;
}
/// <summary>
/// Create a new wire tap with the provided <see cref="IMessageSelector"/>.
/// </summary>
/// <param name="channel">the <see cref="IMessageChannel"/> to which intercepted messages will be sent</param>
/// <param name="selector">the <see cref="IMessageSelector"/> that must accept a message for it to be sent to the intercepting channel</param>
public WireTap(IMessageChannel channel, IMessageSelector selector)
{
AssertUtils.ArgumentNotNull(channel, "_channel", "_channel must not be null");
_channel = channel;
_selector = selector;
}
public override IList<IMessage> Purge(IMessageSelector selector)
{
if(selector == null) {
return Clear();
}
// removing during iterate through an IEnumerable is not supported in .NET.
// so we use a two step algorythm. first we add all message not accepted by the
// the selector to a list and then we iterate through this list and remove the elements
IList<IMessage> messagesToRemove = new List<IMessage>();
foreach(IMessage message in _queue) {
if (!selector.Accept(message)) {
messagesToRemove.Add(message);
}
}
IList<IMessage> purgedMessages = new List<IMessage>();
foreach(IMessage message in messagesToRemove) {
if(_queue.Remove(message)) {
purgedMessages.Add(message);
}
}
return purgedMessages;
}
public NetworkMessageHost(IMessageSelector selector)
{
this.selector = selector;
this.listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
this.connections = new List<SocketConnection>();
}
public abstract IList<IMessage> Purge(IMessageSelector selector);
