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POPattern for generic communication framework (handling and exposing received data)
 

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  1. POPattern for generic communication framework (handling and exposing received data)
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    <p>I am currently a good portion of the way through developing a socket based implementation of a generic communication "framework" that works between C# and Android.</p> <p>Building the server and client has been easy enough. Nothing too technically challenging about that.</p> <p>At this point the implementation contains 2 major components.</p> <blockquote> <p>AndroidTcpListener (tcp socket class that handles communication) <Br> AndroidTcpServer (class that creates an instance of the TcpListener and handles the DataReceived (from the TcpListener) when data is received)</p> <p>Data is sent between the client and the server using the standard XML serializer (I may move to JSON at some point but for the time being I have settled on XML)</p> </blockquote> <p>Where I seem to be completely stuck is how to handle and expose the data received.</p> <p>I have tried using generics but no matter how I structure it, it seems that in the end I end up having to create an <code>AndroidTcpServer&lt;T&gt;</code> which then restricts me to a single datatype.</p> <p>I have tried creating a CustomActivator class as such</p> <pre><code>class CustomActivator&lt;T&gt; where T : Serialization.ITcpSerializable&lt;T&gt; { public CustomActivator(String xmlTypeName, Byte[] data) { this.XmlTypeName = xmlTypeName; this.Data = data; } public String XmlTypeName { get; set; } public Byte[] Data { get; set; } public T Activate() { T res = Activator.CreateInstance&lt;T&gt;(); using (MemoryStream stream = new MemoryStream(this.Data)) { return res.Deserialize(XElement.Load(stream)); } } } </code></pre> <p>But again this seems to restrict me to implementing <code>AndroidTcpServer&lt;T&gt;</code></p> <p>I have tried creating an AndroidTcpEvent class which is structured as such</p> <pre><code>public class AndroidTcpEvent&lt;T&gt; { public AndroidTcpEvent() { } public AndroidTcpEvent(String eventName, T data) { this.EventName = eventName; this.Data = data; } public String EventName { get; set; } public T Data { get; set; } } </code></pre> <p>But the XMLSerializer seems to refuse to want to serialize it (I guess I could implement my own serializer but this is far from trivial and doesnt really solve how I will expose the data)</p> <p>I have tried countless other approaches which all seem to hit a dead end somewhere.</p> <p>So basically at this point I have (Inside of the AndroidTcpServer class a method as such</p> <pre><code>private void DataReceived(Object sender, TcpServerMessageReceivedEventArgs e) { //e.Data = Byte[] of XML serialized data of the message sent (Semantics are unimportant) } </code></pre> <p>In conclusion I am hoping for some guidance on how one would typically handle exposing data received and actually creating instances of the data in such a generic framework and if there are any known patterns that can be used for this problem?</p> <p>Obviously I could scrape all this generic implementation stuff and just create a custom implementation for whatever app I end up trying to build but I am doing this as both a learning exercise and something that I would like to release into the public for others to use.</p> <p>Hopefully I have been clear but if anyone requires clarification on any aspect of this please let me know. Thanks in advance for everyones input.</p>
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    1. USMaxim Gershkovich
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      1. VTUpMod
    1. COWell, how do you know which objects come across the wire? All the xml serializers I've seen require you to know the type you want to deserialize.
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      1. USChrisWue
    2. COYou know because it is expressed as part of the XML and you can use reflection to do the type matching (IE: <ArrayOfStock>). Not perfect but it works. Alternatively I am considering passing in another group of XML with each transfer that contains type information. Not sure yet...
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      1. POPattern for generic communication framework (handling and exposing received data)
      1. USMaxim Gershkovich
 

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