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POIs it possible to restart/reconnect a SignalR connection?
 

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  1. POIs it possible to restart/reconnect a SignalR connection?
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    <p>I am learning how to use AngularJS and SignalR together and I am wondering if I can restart a SignalR connection withot losing the connectionId on the server side. The reason I am asking this has got to do with the client methods that needed to be called serverside. I haven't tried anything out yet and I just was thinking about this situation and what is the best practice solution and I am hoping some could think along or might have the solution and would like to explain it.</p> <p>For example: I have two angularJS controllers, <code>controller1</code> and <code>controller2</code> and two signalR hubs, <code>hub1</code> and <code>hub2</code>. <code>controller1</code> is started on opening the website and in the initialisation of <code>controller1</code> I can bind a function to a client method that needs to be called in <code>hub1</code> before SignalR is started. This works fine and even after signalR is started I can still bind functions to client methods with the <code>on</code> function even if the signalR is started, although this probably isn't nessecary because I can bind the functions to the client methods before starting the signalR connection.</p> <p>Next, on a form I got a button and that button is starting another div which has <code>controller2</code> as <code>ng-controller</code>. In the initialisation of <code>controller2</code> I want to bind functions to client methods that needs to be called in <code>hub2</code>. But since the signalR connection is already started by <code>controller1</code>, I can't do <code>hub2.client.AMethod = function () { }</code>. I was thinking, would this be possible if I can restart a signalR connection without losing the connectionId on the server side and by doing the restart, also refresh all the client methods bindings? And if not, can I use the <code>on</code> function even if there hasn't been a function binded to client method on <code>hub2</code> before? Or do I have to bind an empty function to a client method on <code>hub2</code> as well before I start my signalR connection?</p> <p><strong>EDIT</strong>: I took the time to set up a code example.</p> <p>I got the 2 hubs: Hub1</p> <pre><code>[HubName("Hub1")] public class Hub1 : Hub { public void TestMethod1(string test) { Clients.All.TestMethod1Hub1("Testing Hub1 method1; " + test); } public void TestMethod2(string test) { Clients.All.TestMethod2Hub1("Testing Hub1 method2; " + test); } } </code></pre> <p>and hub2:</p> <pre><code>[HubName("Hub2")] public class Hub2 : Hub { public void TestMethod1(string test) { Clients.All.TestMethod1Hub2("Testing Hub2 method1; " + test); } public void TestMethod2(string test) { Clients.All.TestMethod2Hub2("Testing Hub2 method2; " + test); } } </code></pre> <p>And I got my angularJS controller:</p> <pre><code>testApp.controller('controller1', ['$scope', 'signalRService', function ($scope, signalRService) { var self = this; $scope.logs = []; self.TestMethod = function(testString) { $scope.logs.push({ text: testString }); $scope.$apply(); }; $scope.initialize = function() { signalRService.connection.Hub1.client.TestMethod1Hub1 = self.TestMethod; //signalRService.connection.Hub2.client.TestMethod1Hub2 = self.TestMethod; signalRService.initialize(); }; $scope.addHandlers = function () { //this will call the client method cause it is set before the connection start. signalRService.connection.Hub1.server.testMethod1("Test 1"); //This is working, so on function isn't required? signalRService.connection.Hub1.client.TestMethod2Hub1 = self.TestMethod; signalRService.connection.Hub1.server.testMethod2("Test 2"); //So you don't need the on method (anymore?). (By the way, this is working as well ofcourse) signalRService.connection.Hub1.on("TestMethod2Hub1", self.TestMethod); signalRService.connection.Hub1.server.testMethod2("Test 3"); //this doesn't work (obviously?) unless the line in the initalize method is uncommented signalRService.connection.Hub2.client.TestMethod1Hub2 = self.TestMethod; signalRService.connection.Hub2.server.testMethod1("Test 4"); //but this doesn't work either. Same: works if line in the initialize method is uncommented signalRService.connection.Hub2.on("TestMethod1Hub2", self.TestMethod); signalRService.connection.Hub2.server.testMethod1("Test 5"); //Also, I get the test 4 and test 5 twice, so the event handlers are added, not replaced. }; }]); </code></pre> <p>In the example, the binding to the client methods happens much later after the signalR is started (In this case, by pressing the button as example, but in a live example it could be when a user navigates to a different ng-view template and with that starts a different angular controller which also depends on client methods). In the test I see I have to add a client method (dummy or not) to every hub so I can add extra client methods later at a start up of another angular controller. I wonder if this could be done otherwise, so you don't get a long list of binding dummy functions to client methods?</p> <p>Also, it doesn't seems to be nessecary to use the on function, binding straight away seems to work as well after the connection is started. Perhaps this is changed in SignalR version 2.0.0</p>
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