Initial commit

packager/react-packager/example_project/js/Channel.js

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+/**
+ * @providesModule Channel
+ */
+
+var XHR = require('XHR');
+
+/**
+ * Client implementation of a server-push channel.
+ *
+ * @see Channel.js for full documentation
+ */
+var channel = null, at = null, delay = 0;
+var Channel = {};
+
+Channel.connect = function() {
+  var url = '/pull';
+  if (channel) {
+    url += '?channel=' + channel + '&at=' + at;
+  }
+  XHR.get(url, function(err, xhr) {
+    if (err) {
+      delay = Math.min(Math.max(1000, delay * 2), 30000);
+    } else {
+      var res = xhr.responseText;
+      res = JSON.parse(res);
+
+      delay = 0;
+
+      // Cache channel state
+      channel = res.channel;
+      at = res.at;
+
+      var messages = res.messages;
+      messages.forEach(function(message) {
+        var ev = document.createEvent('CustomEvent');
+        ev.initCustomEvent(message.event, true, true, message.detail);
+        window.dispatchEvent(ev);
+      });
+    }
+
+    // Reconnect
+    setTimeout(Channel.connect, delay);
+  });
+};
+
+module.exports = Channel;