/
MessageLengthInterceptor.java
137 lines (114 loc) · 4.83 KB
/
MessageLengthInterceptor.java
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/*
* Copyright 2012 Jeanfrancois Arcand
*
* 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.Action;
import org.atmosphere.cpr.ApplicationConfig;
import org.atmosphere.cpr.AsyncIOWriter;
import org.atmosphere.cpr.AsyncIOWriterAdapter;
import org.atmosphere.cpr.AtmosphereConfig;
import org.atmosphere.cpr.AtmosphereInterceptor;
import org.atmosphere.cpr.AtmosphereResource;
import org.atmosphere.cpr.AtmosphereResponse;
import org.atmosphere.websocket.WebSocket;
import org.atmosphere.websocket.WebSocketResponseFilter;
import java.io.IOException;
/**
* An {@link AtmosphereInterceptor} that add a special String "<||>" at the end of a message, allowing the
* atmosphere.js to detect if one or several messages where aggregated in one write operations.
*
* The special String is configurable using {@link ApplicationConfig#MESSAGE_DELIMITER}
*
* @author Jeanfrancois Arcand
*/
public class MessageLengthInterceptor implements AtmosphereInterceptor {
private final static byte[] END = "|".getBytes();
private byte[] end = END;
@Override
public void configure(AtmosphereConfig config) {
String s = config.getInitParameter(ApplicationConfig.MESSAGE_DELIMITER);
if (s != null) {
end = s.getBytes();
}
}
@Override
public Action inspect(final AtmosphereResource r) {
final AtmosphereResponse response = r.getResponse();
if (r.transport() != AtmosphereResource.TRANSPORT.WEBSOCKET) {
response.asyncIOWriter(new AsyncIOWriterAdapter() {
@Override
public AsyncIOWriter redirect(String location) throws IOException {
response.sendRedirect(location);
return this;
}
@Override
public AsyncIOWriter writeError(int errorCode, String message) throws IOException {
response.sendError(errorCode);
return this;
}
@Override
public AsyncIOWriter write(String data) throws IOException {
response.write(data + "<||>");
return this;
}
@Override
public AsyncIOWriter write(byte[] data) throws IOException {
response.write(data).write(end);
return this;
}
@Override
public AsyncIOWriter write(byte[] data, int offset, int length) throws IOException {
response.write(data, offset, length).write(end);
return this;
}
@Override
public void close() throws IOException {
response.closeStreamOrWriter();
}
@Override
public AsyncIOWriter flush() throws IOException {
response.flushBuffer();
return this;
}
});
} else {
((WebSocket)response.getAsyncIOWriter()).webSocketResponseFilter(new WebSocketResponseFilter() {
@Override
public String filter(AtmosphereResponse r, String message) {
return message + "<||>";
}
@Override
public byte[] filter(AtmosphereResponse r, byte[] message) {
byte[] nb = new byte[message.length + end.length];
System.arraycopy(message, 0, nb, 0, message.length);
System.arraycopy(end, 0, nb, message.length, nb.length);
return nb;
}
@Override
public byte[] filter(AtmosphereResponse r, byte[] message, int offset, int length) {
byte[] nb = new byte[length+ end.length];
System.arraycopy(message, offset, nb, 0, length);
System.arraycopy(end, 0, nb, length, nb.length);
return nb;
}
});
}
return Action.CONTINUE;
}
@Override
public String toString() {
return "<||> End Message Interceptor";
}
}