/**
* Protocol processes messages being received and sent in the applciation
*
* @param message
*/
public String Protocol(String message) {
if (message.contains("ID")) {
String firstWordOfMessage = message.toUpperCase().trim().split("\\s+")[0];
if (firstWordOfMessage.equals(Settings.Version.toUpperCase()))
return this.IDQueryResponseProcess(this.genResponse(message)).toString();
else return this.IDQueryRequestProcess(this.genRequest(message)).toString();
} else if (message.contains("NEXT")) {
String firstWordOfMessage = message.toUpperCase().trim().split("\\s+")[0];
if (firstWordOfMessage.equals(Settings.Version.toUpperCase()))
return this.NextQueryResponseProcess(this.genResponse(message)).toString();
else return this.NEXTQueryReuqestProcess(this.genRequest(message)).toString();
} else if (message.contains("PULL")) {
String firstWordOfMessage = message.toUpperCase().trim().split("\\s+")[0];
if (firstWordOfMessage.equals(Settings.Version.toUpperCase()))
return this.PullQueryResponseProcess(this.genResponse(message)).toString();
else return this.PullQueryRequestProcess(this.genRequest(message)).toString();
} else if (message.contains("ADD")) {
String firstWordOfMessage = message.toUpperCase().trim().split("\\s+")[0];
if (firstWordOfMessage.equals(Settings.Version.toUpperCase()))
return this.AddQueryResponseProcess(this.genResponse(message)).toString();
else return this.AddQueryRequestProcess(this.genRequest(message)).toString();
} else if (message.contains("QUERY")) {
String firstWordOfMessage = message.toUpperCase().trim().split("\\s+")[0];
if (firstWordOfMessage.equals(Settings.Version.toUpperCase()))
return this.QueryResponseProcess(this.genResponse(message)).toString();
else return this.QueryRequestProcess(this.genRequest(message)).toString();
} else if (message.contains("info")) {
return this.toString();
}
return "";
}
/**
* Processes an ID query request
*
* @param request
* @return
*/
public Response IDQueryRequestProcess(Request request) {
ArrayList<String> responseMessage = new ArrayList<String>();
if (getInt(this.getID()) < getInt(this.NextPeerID)
&& getInt(request.getPeerID()) > getInt(this.getID())
&& getInt(request.getPeerID()) > getInt(this.getNextPeerID())) {
responseMessage.add(this.getNextPeerHostName() + " " + this.getNextPeerPort());
return new Response(Settings.Version, "ID", "1", "301", "redirect", responseMessage);
} else if (getInt(request.getPeerID()) > getInt(this.getID())
&& getInt(request.getPeerID()) < getInt(this.getNextPeerID())
|| getInt(this.getID()) > getInt(this.NextPeerID)
&& getInt(request.getPeerID()) > getInt(this.getID())) {
return new Response(Settings.Version, "ID", "0", "200", "ok", responseMessage);
} else if (this.getID() == this.NextPeerID) {
if (getInt(this.getID()) > getInt(request.getPeerID())) {
return new Response(Settings.Version, "ID", "0", "200", "ok", responseMessage);
} else {
// This condition requires more coding time
return NEXTQueryReuqestProcess(request);
}
} else if (getInt(request.getPeerID()) == getInt(this.getID())) {
return new Response(Settings.Version, "ID", "0", "400", "peerexist", responseMessage);
} else if (!request.getVersion().trim().equals(Settings.Version.trim())) {
return new Response(Settings.Version, "ID", "0", "401", "versionError", responseMessage);
} else {
return new Response(Settings.Version, "ID", "0", "503", "UnknownCondition", responseMessage);
}
}
public Request genRequest(String message) {
String[] ArrayMessage = message.trim().split("CRLF");
String version = null;
String operation = null;
int numOfLines = 0;
String peerID = null;
ArrayList<String> Message = new ArrayList<String>();
for (String strValue : ArrayMessage) {
if (strValue.toUpperCase().contains(Settings.Version.toUpperCase())) {
String[] wordsInLine = strValue.trim().split("\\s+");
operation = wordsInLine[0];
version = wordsInLine[1];
numOfLines = Integer.parseInt(wordsInLine[2]);
if (wordsInLine.length == 4) {
peerID = wordsInLine[3];
}
} else {
Message.add(strValue);
}
}
if (peerID == null & Message.size() == 0) {
return new Request(operation, version, numOfLines);
} else if (peerID == null & Message.size() > 0) {
return new Request(operation, version, numOfLines, Message);
} else {
return new Request(operation, version, numOfLines, peerID, Message);
}
}