/** Handle a connection DROP_DOWN request from the FE. */
protected void handleDropDown(Connection c, JICPPacket pkt, InetAddress addr, int port) {
if (myLogger.isLoggable(Logger.INFO)) {
myLogger.log(Logger.INFO, myID + ": DROP_DOWN request received.");
}
try {
// If the INP connection is down or we have some postponed command
// to flush, refuse dropping the connection
if (inpManager.isConnected() && inpManager.isEmpty()) {
JICPPacket rsp =
new JICPPacket(JICPProtocol.RESPONSE_TYPE, JICPProtocol.DEFAULT_INFO, null);
c.writePacket(rsp);
inpManager.resetConnection();
outManager.resetConnection();
connectionDropped = true;
} else {
myLogger.log(Logger.WARNING, myID + ": DROP_DOWN request refused.");
JICPPacket rsp = new JICPPacket(JICPProtocol.ERROR_TYPE, getReconnectInfo(), null);
c.writePacket(rsp);
}
} catch (Exception e) {
myLogger.log(Logger.WARNING, myID + ": Error writing DROP_DOWN response. " + e);
}
}
private final byte getReconnectInfo() {
byte info = JICPProtocol.DEFAULT_INFO;
// If the inpConnection is null request the FrontEnd to reconnect
if (!inpManager.isConnected()) {
info |= JICPProtocol.RECONNECT_INFO;
}
return info;
}
/**
* This is periodically called by the JICPMediatorManager and is used by this NIOMediator to
* evaluate the elapsed time without the need of a dedicated thread or timer.
*/
public final void tick(long currentTime) {
if (active && !connectionDropped) {
// 1) If there is a blocking read operation in place check the
// response timeout
inpManager.checkResponseTime(currentTime);
// 2) Evaluate the keep alive
if (keepAliveTime > 0) {
if ((currentTime - lastReceivedTime) > (keepAliveTime + RESPONSE_TIMEOUT)) {
// Missing keep-alive.
// The OUT connection is no longer valid
if (outManager.isConnected()) {
myLogger.log(Logger.WARNING, myID + ": Missing keep-alive");
outManager.resetConnection();
}
// Check the INP connection. Since this method must return
// asap, does it in a separated Thread
if (inpManager.isConnected()) {
Thread t =
new Thread() {
public void run() {
try {
// JICPPacket pkt = new JICPPacket(JICPProtocol.KEEP_ALIVE_TYPE,
// JICPProtocol.DEFAULT_INFO, null);
// inpManager.dispatch(pkt, false);
inpManager.sendServerKeepAlive();
if (myLogger.isLoggable(Logger.CONFIG)) {
myLogger.log(Logger.CONFIG, myID + ": IC valid");
}
} catch (Exception e) {
// Just do nothing: the INP connection has been reset
}
}
};
t.start();
}
}
}
// 3) Evaluate the max disconnection time
if (outManager.checkMaxDisconnectionTime(currentTime)) {
myLogger.log(Logger.SEVERE, myID + ": Max disconnection time expired.");
// Consider as if the FrontEnd has terminated spontaneously -->
// Kill the above container (this will also kill this NIOBEDispatcher).
kill();
}
}
}
public boolean isConnected() {
return inpManager.isConnected() && outManager.isConnected();
}