svn commit: r1471766 - /activemq/activemq-dotnet/Apache.NMS.ActiveMQ/trunk/src/main/csharp/Threads/Scheduler.cs

[ta...@apache.org]

Author: tabish
Date: Wed Apr 24 23:21:52 2013
New Revision: 1471766

URL: http://svn.apache.org/r1471766
Log:
fixes for:
https://issues.apache.org/jira/browse/AMQNET-431
https://issues.apache.org/jira/browse/AMQNET-430
https://issues.apache.org/jira/browse/AMQNET-429
https://issues.apache.org/jira/browse/AMQNET-428
https://issues.apache.org/jira/browse/AMQNET-329

Add a Scheduler class for use in Connection to handle delayed an repeating tasks such as non-blocking redelivery. 

Added:
    activemq/activemq-dotnet/Apache.NMS.ActiveMQ/trunk/src/main/csharp/Threads/Scheduler.cs   (with props)

Added: activemq/activemq-dotnet/Apache.NMS.ActiveMQ/trunk/src/main/csharp/Threads/Scheduler.cs
URL: http://svn.apache.org/viewvc/activemq/activemq-dotnet/Apache.NMS.ActiveMQ/trunk/src/main/csharp/Threads/Scheduler.cs?rev=1471766&view=auto
==============================================================================
--- activemq/activemq-dotnet/Apache.NMS.ActiveMQ/trunk/src/main/csharp/Threads/Scheduler.cs (added)
+++ activemq/activemq-dotnet/Apache.NMS.ActiveMQ/trunk/src/main/csharp/Threads/Scheduler.cs Wed Apr 24 23:21:52 2013
@@ -0,0 +1,159 @@
+/*
+ * 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.Threading;
+using System.Collections.Generic;
+
+namespace Apache.NMS.ActiveMQ.Threads
+{
+	/// <summary>
+	/// Scheduler Service useful for running various delayed units of work.
+	/// </summary>
+	public class Scheduler
+	{
+		private object syncRoot = new object();
+    	private readonly String name;
+    	private TimerEx timer;
+    	private readonly Dictionary<Object, TimerTask> timerTasks = new Dictionary<object, TimerTask>();
+
+		public Scheduler(String name)
+		{
+			this.name = name;
+		}
+
+		/// <summary>
+		/// Executes the given task periodically using a fixed-delay execution style 
+		/// which prevents tasks from bunching should there be some delay such as
+		/// garbage collection or machine sleep.  
+		/// 
+		/// This repeating unit of work can later be cancelled using the WaitCallback
+		/// that was originally used to initiate the processing.
+		/// </summary>
+	    public void ExecutePeriodically(WaitCallback task, object arg, int period) 
+		{
+			lock (this.syncRoot)
+			{
+				CheckStarted();
+	        	TimerTask timerTask = timer.Schedule(task, arg, period, period);
+	        	timerTasks.Add(task, timerTask);
+			}
+	    }
+
+		/// <summary>
+		/// Executes the given task periodically using a fixed-delay execution style 
+		/// which prevents tasks from bunching should there be some delay such as
+		/// garbage collection or machine sleep.  
+		/// 
+		/// This repeating unit of work can later be cancelled using the WaitCallback
+		/// that was originally used to initiate the processing.
+		/// </summary>
+	    public void ExecutePeriodically(WaitCallback task, object arg, TimeSpan period) 
+		{
+			lock (this.syncRoot)
+			{
+				CheckStarted();
+		        TimerTask timerTask = timer.Schedule(task, arg, period, period);
+		        timerTasks.Add(task, timerTask);
+			}
+	    }
+
+		/// <summary>
+		/// Executes the given task the after delay, no reference is kept for this
+		/// task so it cannot be cancelled later.  
+		/// </summary>
+	    public void ExecuteAfterDelay(WaitCallback task, object arg, int delay) 
+		{
+			lock (this.syncRoot)
+			{
+				CheckStarted();
+			}
+
+			timer.Schedule(task, arg, delay);
+	    }
+
+		/// <summary>
+		/// Executes the given task the after delay, no reference is kept for this
+		/// task so it cannot be cancelled later.  
+		/// </summary>
+	    public void ExecuteAfterDelay(WaitCallback task, object arg, TimeSpan delay) 
+		{
+			lock (this.syncRoot)
+			{
+				CheckStarted();
+			}
+
+			timer.Schedule(task, arg, delay);
+	    }
+
+	    public void Cancel(object task) 
+		{
+			lock (this.syncRoot)
+			{
+				if (timerTasks.ContainsKey(task))
+				{
+	        		TimerTask ticket = timerTasks[task];
+	        		if (ticket != null) 
+					{
+			            ticket.Cancel();
+	            		timer.Purge(); // remove cancelled TimerTasks
+	        		}
+
+					timerTasks.Remove(task);
+				}
+			}
+	    }
+
+	    public void Start()
+		{
+			lock (this.syncRoot)
+			{
+	        	this.timer = new TimerEx(name, true);
+			}
+	    }
+
+	    public void Stop() 
+		{
+			lock (this.syncRoot)
+			{
+	        	if (this.timer != null)
+            	{
+	            	this.timer.Cancel();
+	        	}
+			}
+	    }
+
+		public String Name
+		{
+			get { return this.name; }
+		}
+
+	    public override string ToString()
+		{
+			return string.Format("[Scheduler][{0}]", name);
+		}
+
+		private void CheckStarted()
+		{
+			if (this.timer == null)
+			{
+				throw new InvalidOperationException("The Schedular has not been started yet");
+			}
+		}
+	}
+}
+

Propchange: activemq/activemq-dotnet/Apache.NMS.ActiveMQ/trunk/src/main/csharp/Threads/Scheduler.cs
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