| // $Id$ |
| // |
| // 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.Collections.Generic; |
| using System.IO; |
| using System.Reflection; |
| using Org.Apache.Etch.Bindings.Csharp.Transport; |
| using Org.Apache.Etch.Bindings.Csharp.Util; |
| |
| namespace Org.Apache.Etch.Bindings.Csharp.Support |
| { |
| /// <summary> |
| /// Interface to transport factory |
| /// </summary> |
| public abstract class TransportFactory |
| { |
| /// <summary> |
| /// Constructs a new Transport stack topped by a TransportMessage |
| /// which is used by the remote service implementations to send |
| /// messages. |
| /// </summary> |
| /// <param name="uri">transport configuration parameters.</param> |
| /// <param name="resources">additional resources needed by the stack.</param> |
| /// <returns>the TransportMessage topping the transport stack.</returns> |
| protected abstract TransportMessage NewTransport(string uri, Resources resources); |
| |
| /// <summary> |
| /// Constructs a new Transport stack topped by a TransportMessage |
| /// which is used by the remote service implementations to send |
| /// messages. |
| /// </summary> |
| /// <param name="uri">transport configuration parameters.</param> |
| /// <param name="resources">additional resources needed by the stack.</param> |
| /// <returns>the TransportMessage topping the transport stack.</returns> |
| public static TransportMessage GetTransport(string uri, Resources resources) |
| { |
| URL u = new URL(uri); |
| TransportFactory f = GetTransportFactory(u.Scheme); |
| return f.NewTransport(uri, resources); |
| } |
| |
| /// <summary> |
| /// Constructs a new Transport Listener which is used to construct |
| /// server sessions. |
| /// </summary> |
| /// <param name="uri">listener configuration parameters.</param> |
| /// <param name="resources">additional resources needed by the listener.</param> |
| /// <returns>an out-of-band source which may be used to control the listener.</returns> |
| protected abstract Transport<ServerFactory> NewListener(string uri, Resources resources); |
| |
| /// <summary> |
| /// Constructs a new Transport Listener which is used to construct |
| /// server sessions. |
| /// </summary> |
| /// <param name="uri">listener configuration parameters.</param> |
| /// <param name="resources">additional resources needed by the listener.</param> |
| /// <returns>an out-of-band source which may be used to control the listener.</returns> |
| public static Transport<ServerFactory> GetListener(string uri, Resources resources) |
| { |
| URL u = new URL(uri); |
| TransportFactory f = GetTransportFactory(u.Scheme); |
| return f.NewListener(uri, resources); |
| } |
| |
| /// <summary> |
| /// Adds any message filters specified on the uri. They are added in order |
| /// from transport to session. The first filter is the session for Messagizer, |
| /// the second is the session for the first, etc. The last filter added is |
| /// returned, and becomes the TransportMessage for what follows. |
| /// </summary> |
| /// <param name="transport"></param> |
| /// <param name="uri"></param> |
| /// <param name="resources"></param> |
| /// <returns>the most recently added filter</returns> |
| protected TransportMessage AddFilters(TransportMessage transport, URL uri, Resources resources) |
| { |
| string s = uri.GetTerm(FILTER); |
| if (s == null || s.Length == 0) |
| return transport; |
| |
| StringTokenizer st = new StringTokenizer(s, ",:;| \t\r\n"); |
| while (st.HasMoreTokens()) |
| { |
| string t = st.NextToken(); |
| transport = AddFilter(transport, t, uri, resources); |
| } |
| |
| return transport; |
| } |
| |
| /// <summary> |
| /// Query term on the transport uri which defines a set of filters which |
| /// process messages as they move up and down the transport stack. Filter |
| /// names are separated by one or more of these characters: ",:;| \t\r\n". |
| /// |
| /// Usage example: tcp://host:port?filter=KeepAlive,PwAuth |
| /// </summary> |
| public const string FILTER = "filter"; |
| |
| private TransportMessage AddFilter(TransportMessage transport, string name, |
| URL uri, Resources resources) |
| { |
| string typeName = GetFilter(name); |
| |
| if (typeName == null) |
| throw new ArgumentException( |
| string.Format( "Class '{0}' for filter name '{1}' not defined", typeName, name ) ); |
| |
| Type type = Type.GetType(typeName); |
| |
| ConstructorInfo c = type.GetConstructor(FILTER_PARAMS); |
| |
| return (TransportMessage) c.Invoke(new object[] { transport, uri, resources }); |
| } |
| |
| private readonly static Type[] FILTER_PARAMS = { typeof(TransportMessage), typeof(URL), typeof(Resources) }; |
| |
| /// <summary> |
| /// Gets the fully qualified type name of the filter. |
| /// </summary> |
| /// <param name="name"></param> |
| /// <returns>the fully qualified type name of the filter.</returns> |
| public static string GetFilter(string name) |
| { |
| lock (filters) |
| { |
| string value; |
| return filters.TryGetValue(name, out value) ? value : null; |
| } |
| } |
| |
| /// <summary> |
| /// Sets the fully qualified type name of the filter. |
| /// </summary> |
| /// <param name="name"></param> |
| /// <param name="typeName"></param> |
| public static void DefineFilter(string name, string typeName) |
| { |
| lock (filters) |
| { |
| filters.Add(name, typeName); |
| } |
| } |
| |
| private static readonly Dictionary<string, string> filters = |
| new Dictionary<string, string>(); |
| |
| /// <summary> |
| /// Gets the named transport factory. |
| /// </summary> |
| /// <param name="name">the name of a configured transport factory.</param> |
| /// <returns>the named transport factory.</returns> |
| private static TransportFactory GetTransportFactory( string name ) |
| { |
| object tfspec = Get(name); |
| |
| if (tfspec == null) |
| throw new IOException("transport factory scheme '" + name + "' unknown"); |
| |
| if (tfspec is string) |
| tfspec = Type.GetType((string)tfspec); |
| |
| if (tfspec is Type) |
| { |
| ConstructorInfo c = ((Type)tfspec).GetConstructor(FACTORY_PARAMS); |
| tfspec = c.Invoke(FACTORY_ARGS); |
| } |
| |
| if (tfspec is TransportFactory) |
| return (TransportFactory)tfspec; |
| |
| throw new ArgumentException(String.Format( |
| "Cannot create an instance of TransportFactory from transport factory name '{0}'", name)); |
| } |
| |
| private readonly static Type[] FACTORY_PARAMS = { }; |
| |
| private readonly static object[] FACTORY_ARGS = { }; |
| |
| public static object Get(string name) |
| { |
| lock (transportFactories) |
| { |
| object value; |
| return transportFactories.TryGetValue(name, out value) ? value : null; |
| } |
| } |
| |
| |
| /// <summary> |
| /// Puts a named transport factory. |
| /// </summary> |
| /// <param name="name">the uri scheme of this transport factory.</param> |
| /// <param name="tfspec">the transport factory spec to associate with the |
| /// name. This can be an instance of TransportFactory or the name of a subclass |
| /// of TransportFactory to instantiate.</param> |
| public static void Define( string name, object tfspec ) |
| { |
| lock (transportFactories) |
| { |
| transportFactories.Add(name, tfspec); |
| } |
| } |
| |
| private readonly static Dictionary<string, object> transportFactories = |
| new Dictionary<string, object>(); |
| |
| static TransportFactory() |
| { |
| Define("tcp", new TcpTransportFactory(false)); |
| Define("tls", new TcpTransportFactory(true)); |
| |
| DefineFilter("KeepAlive", "Org.Apache.Etch.Bindings.Csharp.Transport.Filter.KeepAlive"); |
| DefineFilter("PwAuth", "Org.Apache.Etch.Bindings.Csharp.Transport.Filter.PwAuth"); |
| DefineFilter("Logger", "Org.Apache.Etch.Bindings.Csharp.Transport.Filter.Logger"); |
| } |
| } |
| } |