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package org.atmosphere.gwt.client.impl;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import org.atmosphere.gwt.client.AtmosphereClient;
import org.atmosphere.gwt.client.AtmosphereClientException;
import org.atmosphere.gwt.client.AtmosphereGWTSerializer;
import com.google.gwt.core.client.JsArrayString;
import com.google.gwt.http.client.Response;
import com.google.gwt.user.client.rpc.SerializationException;
import com.google.gwt.user.client.rpc.StatusCodeException;
/**
*
* @author p.havelaar
*/
abstract public class StreamingProtocolTransport extends BaseCometTransport {
private static final String SEPARATOR = "\n";
protected boolean aborted;
protected boolean expectingDisconnection;
protected int read;
public void init() {
aborted = false;
expectingDisconnection = false;
read = 0;
}
protected void onReceiving(int statusCode, String responseText, boolean connected) {
if (statusCode != Response.SC_OK) {
if (!connected) {
expectingDisconnection = true;
listener.onError(new StatusCodeException(statusCode, responseText), connected);
}
}
else {
int index = responseText.lastIndexOf(SEPARATOR);
if (index > read) {
List<Serializable> messages = new ArrayList<Serializable>();
JsArrayString data = AtmosphereClient.split(responseText.substring(read, index), SEPARATOR);
int length = data.length();
for (int i = 0; i < length; i++) {
if (aborted) {
return;
}
parse(data.get(i), messages);
}
read = index + 1;
if (!messages.isEmpty()) {
listener.onMessage(messages);
}
}
if (!connected) {
if (expectingDisconnection) {
listener.onDisconnected();
}
else {
listener.onError(new AtmosphereClientException("Unexpected disconnection"), false);
}
}
}
}
private void parse(String message, List<Serializable> messages) {
if (expectingDisconnection) {
listener.onError(new AtmosphereClientException("Expecting disconnection but received message: " + message), true);
}
else if (message.isEmpty()) {
listener.onError(new AtmosphereClientException("Invalid empty message received"), true);
}
else {
char c = message.charAt(0);
switch (c) {
case '!':
String initParameters = message.substring(1);
try {
String[] params = initParameters.split(":");
connectionId = Integer.parseInt(params[1]);
listener.onConnected(Integer.parseInt(params[0]), connectionId);
}
catch (NumberFormatException e) {
listener.onError(new AtmosphereClientException("Unexpected init parameters: " + initParameters), true);
}
break;
case '?':
// clean disconnection
expectingDisconnection = true;
break;
case '#':
listener.onHeartbeat();
break;
case '@':
listener.onRefresh();
break;
case '*':
// ignore padding
break;
case '|':
messages.add(message.substring(1));
break;
case ']':
messages.add(unescape(message.substring(1)));
break;
case '[':
case 'R':
case 'r':
case 'f':
try {
messages.add(parse(message));
}
catch (SerializationException e) {
listener.onError(e, true);
}
break;
default:
listener.onError(new AtmosphereClientException("Invalid message received: " + message), true);
}
}
}
static String unescape(String string) {
return string.replace("\\n", "\n").replace("\\\\", "\\");
}
}