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   * Copyright 2012 Google Inc.
   * Licensed 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
  * 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.
 package elemental.html;
 import  elemental.html.*;
 import java.util.Date;

The EventSource interface is used to manage server-sent events. You can set the onmessage attribute to a JavaScript function to receive non-typed messages (that is, messages with no event field). You can also call addEventListener() to listen for events just like any other event source.

See Using server-sent events for further details.

 public interface EventSource extends EventTarget {

The connection is not being established, has been closed or there was a fatal error.
     static final int CLOSED = 2;

The connection is being established.
     static final int CONNECTING = 0;

The connection is open and dispatching events.
     static final int OPEN = 1;
   String getURL();

A JavaScript function to call when an error occurs.
   void setOnerror(EventListener arg);

A JavaScript function to call when an a message without an event field arrives.
   void setOnmessage(EventListener arg);

A JavaScript function to call when the connection has opened.
   void setOnopen(EventListener arg);

The state of the connection, must be one of CONNECTING, OPEN, or CLOSED. Read only.
   int getReadyState();

Read only.
   String getUrl();
   EventRemover addEventListener(String typeEventListener listenerboolean useCapture);

Closes the connection, if any, and sets the readyState attribute to CLOSED. If the connection is already closed, the method does nothing.
  void close();
  boolean dispatchEvent(Event evt);
  void removeEventListener(String typeEventListener listener);
  void removeEventListener(String typeEventListener listenerboolean useCapture);
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