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TrackMessageSizeFilter.java
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TrackMessageSizeFilter.java
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/*
* Copyright 2008-2024 Async-IO.org
*
* 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
*
* 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.
*/
package org.atmosphere.client;
import org.atmosphere.cpr.AtmosphereRequest;
import org.atmosphere.cpr.AtmosphereResource;
import org.atmosphere.cpr.BroadcastFilter;
import org.atmosphere.cpr.PerRequestBroadcastFilter;
import static org.atmosphere.cpr.HeaderConfig.X_ATMOSPHERE_TRACKMESSAGESIZE;
/**
* A {@link PerRequestBroadcastFilter} implementation that add the expected length of the message. This is
* useful when used with the atmosphere.js library as the library will read the expected size and wait for the
* entire messages to be received before invoking its associated callback.
* <p/>
* NOTE: The broadcasted message MUST BE a String. If your application is broadcasting another object, you need to
* write your own Filter.
* <p/>
* If you aren't using atmosphere.js, you need to add the {@link org.atmosphere.cpr.HeaderConfig#X_ATMOSPHERE_TRACKMESSAGESIZE} header in order to
* enable that Filter. The delimiter character used is '|'.
* <p/>
* For example, broadcasting String 'helloword' will be received by the client as '9|helloword' but delivered as 'helloword'
* to the Javascript function/callback.
*/
public class TrackMessageSizeFilter implements PerRequestBroadcastFilter {
@Override
public BroadcastAction filter(String broadcasterId, AtmosphereResource r, Object originalMessage, Object message) {
AtmosphereRequest request = r.getRequest();
if (r.uuid().equals(BroadcastFilter.VOID_ATMOSPHERE_RESOURCE_UUID) || "true".equalsIgnoreCase(request.getHeader(X_ATMOSPHERE_TRACKMESSAGESIZE))
&& message != null && String.class.isAssignableFrom(message.getClass())) {
String msg = message.toString().trim();
msg = msg.length() + "|" + msg;
return new BroadcastAction(BroadcastAction.ACTION.CONTINUE, msg);
}
return new BroadcastAction(BroadcastAction.ACTION.CONTINUE, message);
}
@Override
public BroadcastAction filter(String broadcasterId, Object originalMessage, Object message) {
return new BroadcastAction(message);
}
}