/**
* Helper function to get value from map.
*
* @param map Map to take value from.
* @param key Key to search in map.
* @param ifNull Default value if {@code null} was returned by map.
* @param <K> Key type.
* @param <V> Value type.
* @return Value from map or default value if map return {@code null}.
*/
public static <K, V> V getOrElse(Map<K, V> map, K key, V ifNull) {
assert map != null;
V res = map.get(key);
return res != null ? res : ifNull;
}
private synchronized String allocName(String type, String namePattern) {
Map<String, Integer> patterns = nameTypes.get(type);
if (patterns == null) {
patterns = new HashMap<String, Integer>();
nameTypes.put(type, patterns);
}
Integer id = patterns.get(namePattern);
if (id == null) id = 0;
id++;
patterns.put(namePattern, id);
String agentName = namePattern.replaceFirst("#", id.toString());
if (agentName.equals(namePattern))
Log.warn("AllocName: missing '#' in name pattern '" + namePattern + "'");
else
Log.debug(
"AllocName: for type="
+ type
+ " assigned '"
+ agentName
+ "' from pattern '"
+ namePattern
+ "'");
return agentName;
}
public Object getAttribute(String name) {
if (name == null) {
throw new NullPointerException("null name parameter");
}
if (attributes == null) {
attributes = getHttpContext().getAttributes();
}
return attributes.get(name);
}
protected void handleClient(SelectionKey key) throws IOException {
SocketChannel sc = (SocketChannel) key.channel();
ClientInfo ci = (ClientInfo) allClients.get(sc);
if (ci == null) throw new IllegalStateException("Unknown client");
if (key.isWritable()) send(sc, ci);
if (key.isReadable())
// 从一个客户端读进所有的可用数据
recv(sc, ci);
}
public static TcpConnectionManager getConnectionPool(EndPoint from, EndPoint to) {
String key = from + ":" + to;
TcpConnectionManager cp = poolTable_.get(key);
if (cp == null) {
lock_.lock();
try {
cp = poolTable_.get(key);
if (cp == null) {
cp =
new TcpConnectionManager(
MessagingConfig.getConnectionPoolInitialSize(),
MessagingConfig.getConnectionPoolGrowthFactor(),
MessagingConfig.getConnectionPoolMaxSize(),
from,
to);
poolTable_.put(key, cp);
}
} finally {
lock_.unlock();
}
}
return cp;
}
/**
* returns the RDPConnection that is registered for the given datagram channel and is connected to
* the host/port in ConnectionInfo returns null if there is no matching registered rdpconnection
*/
static RDPConnection getConnection(DatagramChannel dc, ConnectionInfo conInfo) {
lock.lock();
try {
Map<ConnectionInfo, RDPConnection> dcConMap = allConMap.get(dc);
if (dcConMap == null) {
// there isnt even a datagram associated
if (Log.loggingNet) Log.net("RDPServer.getConnection: could not find datagram");
return null;
}
return dcConMap.get(conInfo);
} finally {
lock.unlock();
}
}
public static void kill(StringTokenizer st) {
try {
if (st.hasMoreTokens()) {
String clientName = st.nextToken();
if (clients.containsKey(clientName)) {
SocketChannel clientChannel = clients.get(clientName);
clients.remove(clientName);
sendMessage(clientChannel, MessageUtils.bye());
notifyAllClients(clientName + " leave this chatroom");
System.out.println(clientName + " leave this chatroom");
Utils.tryClose(clientChannel);
} else {
System.err.println("kill: no such client");
}
} else {
System.err.println("kill: no client name");
}
} catch (Exception expt) {
Utils.printErrorAndExit(expt.getMessage());
}
}
public static void readCommand() {
try {
if (!reader.ready()) {
return;
}
StringTokenizer tokens = new StringTokenizer(reader.readLine());
if (tokens.hasMoreTokens()) {
switch (tokens.nextToken()) {
case "/listen":
listen(tokens);
break;
case "/stop":
stop();
break;
case "/list":
if (port[0] == -1) {
System.err.println("Error: start listening before");
}
for (Entry<String, SocketChannel> client : clients.entrySet()) {
System.out.println(client.getKey());
}
if (clients.entrySet().isEmpty()) {
System.out.println("list: no clients online");
}
break;
case "/send":
if (tokens.hasMoreTokens()) {
String name = tokens.nextToken();
if (clients.containsKey(name)) {
if (tokens.hasMoreTokens()) {
sendMessage(
clients.get(name),
MessageUtils.message("<server>", getMessageFromTokens(tokens)));
} else {
System.err.println("send: message is empty");
}
} else {
System.err.println("send: no such client");
}
} else {
System.err.println("send: no client name");
}
break;
case "/sendall":
if (tokens.hasMoreTokens()) {
notifyAllClients(getMessageFromTokens(tokens));
} else {
System.err.println("sendall: message is empty");
}
break;
case "/kill":
kill(tokens);
break;
case "/exit":
if (port[0] != -1) {
stop();
}
Utils.tryClose(selector);
System.exit(0);
break;
default:
System.err.print("Error: unknown command");
break;
}
} else {
System.err.println("Error: empty input");
}
} catch (Exception expt) {
Utils.printErrorAndExit(expt.getMessage());
}
}
public IVerbHandler getVerbHandler(String type) {
IVerbHandler handler = (IVerbHandler) verbHandlers_.get(type);
return handler;
}
private void checkForReservedVerb(String type) {
if (reservedVerbs_.get(type) != null && verbHandlers_.get(type) != null) {
throw new IllegalArgumentException(type + " is a reserved verb handler. Scram!");
}
}