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TaskServer.d

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00001 /*******************************************************************************
00002 
00003         @file TaskServer.d
00004         
00005         Copyright (c) 2004 Kris Bell
00006         
00007         This software is provided 'as-is', without any express or implied
00008         warranty. In no event will the authors be held liable for damages
00009         of any kind arising from the use of this software.
00010         
00011         Permission is hereby granted to anyone to use this software for any 
00012         purpose, including commercial applications, and to alter it and/or 
00013         redistribute it freely, subject to the following restrictions:
00014         
00015         1. The origin of this software must not be misrepresented; you must 
00016            not claim that you wrote the original software. If you use this 
00017            software in a product, an acknowledgment within documentation of 
00018            said product would be appreciated but is not required.
00019 
00020         2. Altered source versions must be plainly marked as such, and must 
00021            not be misrepresented as being the original software.
00022 
00023         3. This notice may not be removed or altered from any distribution
00024            of the source.
00025 
00026         4. Derivative works are permitted, but they must carry this notice
00027            in full and credit the original source.
00028 
00029 
00030                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
00031 
00032         
00033         @version        Initial version, July 2004      
00034         @author         Kris
00035 
00036 
00037 *******************************************************************************/
00038 
00039 module mango.cluster.TaskServer;
00040 
00041 private import  mango.log.Admin,
00042                 mango.log.Logger;
00043 
00044 public  import  mango.log.model.ILogger;
00045 
00046 private import  mango.io.Socket,
00047                 mango.io.PickleRegistry;
00048 
00049 private import  mango.io.model.IConduit;
00050 
00051 private import  mango.servlet.Servlet,
00052                 mango.servlet.ServletContext,
00053                 mango.servlet.ServletProvider;
00054 
00055 private import  mango.http.server.HttpServer;
00056 
00057 private import  mango.cluster.qos.socket.Cluster;
00058 
00059                 
00060 /******************************************************************************
00061         
00062         @code
00063         import  MyTask1,
00064                 MyTask2,
00065                 MyTask3;
00066 
00067 
00068         class MyTaskServer : TaskServer
00069         {
00070                 this (char[] filename)
00071                 {
00072                         auto FileConduit config = new FileConduit (filename);
00073                         ILogger logger = Logger.getLogger ("my.task.server");
00074 
00075                         super (new Cluster (logger, config));
00076                 }
00077 
00078 
00079                 void enroll (ILogger logger)
00080                 {
00081                         addConsumer (new MyTask1);
00082                         addConsumer (new MyTask2);
00083                         addConsumer (new MyTask3);
00084                 }
00085         }
00086 
00087 
00088         main ()
00089         {
00090                 MyTaskServer mts = new MyTaskServer ("cluster.properties");
00091 
00092                 mts.start ();
00093         }
00094         @endcode
00095 
00096 ******************************************************************************/
00097 
00098 class TaskServer
00099 {
00100         private ILogger         logger;
00101         private ICluster        cluster;
00102         private HttpServer      adminServer;
00103 
00104         /**********************************************************************
00105 
00106         **********************************************************************/
00107 
00108         abstract void enroll (ILogger logger);
00109 
00110         /**********************************************************************
00111 
00112         **********************************************************************/
00113 
00114         this (ICluster cluster, ushort adminPort = 0)
00115         {
00116                 this.cluster = cluster;
00117                 this.logger = cluster.getLogger;
00118 
00119                 if (adminPort)
00120                    {
00121                    // construct a servlet-provider
00122                    ServletProvider sp = new ServletProvider;
00123 
00124                    // create a context for admin servlets
00125                    ServletContext admin = sp.addContext (new AdminContext (sp, "/admin"));
00126 
00127                    // create a (1 thread) server using the IProvider to service requests
00128                    // and start listening for requests (but this thread does not listen)
00129                    adminServer = new HttpServer (sp, new InternetAddress (adminPort), 1, logger);
00130                    }
00131 
00132         }
00133 
00134         /**********************************************************************
00135 
00136         **********************************************************************/
00137 
00138         ICluster getCluster ()
00139         {
00140                 return cluster;
00141         }
00142 
00143         /**********************************************************************
00144 
00145         **********************************************************************/
00146 
00147         void start ()
00148         {
00149                 enroll (logger);
00150 
00151                 if (adminServer)
00152                     adminServer.start ();
00153         }
00154 
00155         /**********************************************************************
00156 
00157         **********************************************************************/
00158 
00159         IConsumer addConsumer (IPickleFactory task, bool enroll = false)
00160         {
00161                 char[] name = task.getGuid;
00162 
00163                 cluster.getLogger.info ("adding consumer '" ~ name ~ "'");
00164         
00165                 if (enroll)
00166                     PickleRegistry.enroll (task);
00167                 return new TaskConsumer (cluster, name);
00168         }
00169 
00170         /**********************************************************************
00171 
00172 
00173         **********************************************************************/
00174 
00175         class TaskConsumer : IEventListener, IConsumer
00176         {
00177                 private char[]          channel;
00178                 private ILogger         logger;
00179                 private IConsumer       consumer;
00180 
00181                 /**************************************************************
00182 
00183                 **************************************************************/
00184 
00185                 this (ICluster cluster, char[] channel)
00186                 {
00187                         this.channel = channel;
00188                         this.logger = cluster.getLogger ();
00189 
00190                         IChannel ch = cluster.createChannel (channel);
00191                         consumer = cluster.createConsumer (ch, IEvent.Style.Message, this);
00192                 }
00193 
00194                 /**************************************************************
00195 
00196                 **************************************************************/
00197 
00198                 void cancel ()
00199                 {
00200                         consumer.cancel ();     
00201                 }
00202 
00203                 /**************************************************************
00204 
00205                         Declares the contract for listeners within the 
00206                         cluster package. When creating a listener, you 
00207                         provide a class that implements this interface. 
00208                         The notify() method is invoked (on a seperate
00209                         thread) whenever a relevant event occurs.
00210 
00211                 **************************************************************/
00212 
00213                 void notify (IEvent event, IPayload payload)
00214                 {
00215                         if (logger.isEnabled (logger.Level.Info))
00216                             logger.info ("executing task from channel '" ~ channel ~ "'");
00217         
00218                         // instantiate the task
00219                         ITask task = cast(ITask) payload;
00220                         
00221                         // fire it up!
00222                         if (task)
00223                            {
00224                            task.execute ();                        
00225 
00226                            if (logger.isEnabled (logger.Level.Trace))
00227                                logger.trace ("completed task from channel '" ~ channel ~ "'");
00228                            }
00229                         else
00230                            logger.error ("received an invalid task on channel '" ~ channel ~ "'");
00231                 }
00232         }
00233 }
00234 

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