/
MenuManagerServer.java
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/
MenuManagerServer.java
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package com.thecoderscorner.menu.remote.mgr;
import com.thecoderscorner.menu.auth.MenuAuthenticator;
import com.thecoderscorner.menu.domain.AnalogMenuItem;
import com.thecoderscorner.menu.domain.EnumMenuItem;
import com.thecoderscorner.menu.domain.MenuItem;
import com.thecoderscorner.menu.domain.state.IntegerMenuState;
import com.thecoderscorner.menu.domain.state.MenuState;
import com.thecoderscorner.menu.domain.state.MenuTree;
import com.thecoderscorner.menu.domain.state.StringListMenuState;
import com.thecoderscorner.menu.domain.util.MenuItemHelper;
import com.thecoderscorner.menu.remote.commands.*;
import com.thecoderscorner.menu.remote.protocol.ApiPlatform;
import com.thecoderscorner.menu.remote.protocol.CorrelationId;
import java.lang.System.Logger.Level;
import java.time.Clock;
import java.util.UUID;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import static com.thecoderscorner.menu.remote.commands.MenuChangeCommand.ChangeType;
import static com.thecoderscorner.menu.remote.commands.MenuHeartbeatCommand.HeartbeatMode;
public class MenuManagerServer implements NewServerConnectionListener {
private final System.Logger logger = System.getLogger(MenuManagerServer.class.getSimpleName());
private final ScheduledExecutorService executorService;
private final MenuTree tree;
private final ServerConnectionManager serverManager;
private final String serverName;
private final UUID serverUuid;
private final MenuAuthenticator authenticator;
private final AtomicBoolean successfulLogin = new AtomicBoolean(false);
private final Clock clock;
private ScheduledFuture<?> hbSchedule;
public MenuManagerServer(ScheduledExecutorService executorService, MenuTree tree, ServerConnectionManager serverManager,
String serverName, UUID uuid, MenuAuthenticator authenticator, Clock clock) {
this.executorService = executorService;
this.tree = tree;
this.serverManager = serverManager;
this.serverName = serverName;
this.serverUuid = uuid;
this.authenticator = authenticator;
this.clock = clock;
}
public void start() {
serverManager.start(this);
hbSchedule = executorService.scheduleAtFixedRate(this::checkHeartbeats, 200, 200, TimeUnit.MILLISECONDS);
}
public void stop() {
if(hbSchedule != null) hbSchedule.cancel(false);
try {
serverManager.stop();
} catch (Exception e) {
logger.log(Level.ERROR, "Server manager threw error during stop", e);
}
}
private void checkHeartbeats() {
for (var socket : serverManager.getServerConnections()) {
if((clock.millis() - socket.lastReceivedHeartbeat()) > (socket.getHeartbeatFrequency() * 3L)) {
logger.log(Level.WARNING, "HB timeout, no received message within frequency");
socket.closeConnection();
}
else if((clock.millis() - socket.lastTransmittedHeartbeat()) > socket.getHeartbeatFrequency()) {
logger.log(Level.INFO, "Sending HB due to inactivity");
socket.sendCommand(new MenuHeartbeatCommand(socket.getHeartbeatFrequency(), HeartbeatMode.NORMAL));
}
}
}
@Override
public void connectionCreated(ServerConnection connection) {
connection.registerMessageHandler(this::messageReceived);
connection.sendCommand(new MenuHeartbeatCommand(connection.getHeartbeatFrequency(), HeartbeatMode.START));
}
private void messageReceived(ServerConnection conn, MenuCommand cmd) {
try {
if(conn.isPairing()) {
logger.log(Level.INFO, "Connection is in pairing mode, ignoring " + cmd);
return; // nothing further is done on a pairing connection.
}
switch(cmd.getCommandType()) {
case JOIN: {
var join = (MenuJoinCommand) cmd;
if (authenticator != null && !authenticator.authenticate(join.getMyName(), join.getAppUuid())) {
logger.log(Level.WARNING, "Invalid credentials from " + join.getMyName());
conn.sendCommand(new MenuAcknowledgementCommand(CorrelationId.EMPTY_CORRELATION, AckStatus.INVALID_CREDENTIALS));
conn.closeConnection();
}
else {
successfulLogin.set(true);
logger.log(Level.WARNING, "Successful login from " + join.getMyName());
conn.sendCommand(new MenuAcknowledgementCommand(CorrelationId.EMPTY_CORRELATION, AckStatus.SUCCESS));
conn.sendCommand(new MenuBootstrapCommand(MenuBootstrapCommand.BootType.START));
tree.recurseTreeIteratingOnItems(MenuTree.ROOT, (item, parent) -> {
if (!item.isLocalOnly()) {
var bootMsg = MenuItemHelper.getBootMsgForItem(item, parent, tree);
bootMsg.ifPresent(conn::sendCommand);
}
});
conn.sendCommand(new MenuBootstrapCommand(MenuBootstrapCommand.BootType.END));
}
break;
}
case PAIRING_REQUEST:
startPairingMode(conn, (MenuPairingCommand)cmd);
break;
case HEARTBEAT: {
var hb = (MenuHeartbeatCommand) cmd;
if(hb.getMode() == HeartbeatMode.START) {
conn.sendCommand(new MenuJoinCommand(serverUuid, serverName, ApiPlatform.JAVA_API, 1));
}
break;
}
case CHANGE_INT_FIELD:
if(!successfulLogin.get()) {
logger.log(Level.WARNING, "Un-authenticated change command ignored");
return;
}
handleIncomingChange(conn, (MenuChangeCommand) cmd);
break;
}
} catch (Exception e) {
conn.closeConnection();
}
}
private void startPairingMode(ServerConnection conn, MenuPairingCommand cmd) {
conn.enablePairingMode();
var success = authenticator.addAuthentication(cmd.getName(), cmd.getUuid());
var determinedStatus = success ? AckStatus.SUCCESS : AckStatus.INVALID_CREDENTIALS;
conn.sendCommand(new MenuAcknowledgementCommand(CorrelationId.EMPTY_CORRELATION, determinedStatus));
}
public MenuTree getManagedMenu() {
return tree;
}
public void updateMenuItem(MenuItem item, Object newValue) {
MenuItemHelper.setMenuState(item, newValue, tree);
menuItemDidUpdate(item);
}
public void menuItemDidUpdate(MenuItem item) {
logger.log(Level.INFO, "Sending item update for " + item);
var state = tree.getMenuState(item);
if(state == null) return;
MenuCommand cmd;
if(state instanceof StringListMenuState) {
cmd = new MenuChangeCommand(CorrelationId.EMPTY_CORRELATION, item.getId(), ((StringListMenuState)state).getValue());
}
else {
cmd = new MenuChangeCommand(CorrelationId.EMPTY_CORRELATION, item.getId(), ChangeType.ABSOLUTE,
state.getValue().toString());
}
for(var socket : serverManager.getServerConnections()) {
socket.sendCommand(cmd);
}
}
private void handleIncomingChange(ServerConnection socket, MenuChangeCommand cmd) {
var maybeItem = tree.getMenuById(cmd.getMenuItemId());
if(maybeItem.isEmpty()) {
socket.sendCommand(new MenuAcknowledgementCommand(cmd.getCorrelationId(), AckStatus.ID_NOT_FOUND));
return;
}
var item = maybeItem.get();
if(cmd.getChangeType() == ChangeType.DELTA) {
MenuState<Integer> state = tree.getMenuState(item);
if(state == null) state = new IntegerMenuState(item, true, false, 0);
int val = state.getValue() + Integer.parseInt(cmd.getValue());
if(val <= 0 || (item instanceof AnalogMenuItem && val > ((AnalogMenuItem) item).getMaxValue()) ||
(item instanceof EnumMenuItem && val >= ((EnumMenuItem) item).getEnumEntries().size())) {
socket.sendCommand(new MenuAcknowledgementCommand(cmd.getCorrelationId(), AckStatus.VALUE_RANGE_WARNING));
return;
}
state = new IntegerMenuState(item, state.isChanged(), state.isActive(), val);
tree.changeItem(item, state);
sendChangeAndAck(socket, item, val, cmd.getCorrelationId());
} else if(cmd.getChangeType() == ChangeType.ABSOLUTE) {
var newState = MenuItemHelper.stateForMenuItem(tree.getMenuState(item), item, cmd.getValue());
tree.changeItem(item, newState);
sendChangeAndAck(socket, item, cmd.getValue(), cmd.getCorrelationId());
}
}
private void sendChangeAndAck(ServerConnection socket, MenuItem item, Object val, CorrelationId correlationId) {
socket.sendCommand(new MenuAcknowledgementCommand(correlationId, AckStatus.SUCCESS));
socket.sendCommand(new MenuChangeCommand(CorrelationId.EMPTY_CORRELATION, item.getId(), ChangeType.ABSOLUTE, val.toString()));
}
public void reportDialogUpdate(DialogMode show, String title, String content, MenuButtonType b1, MenuButtonType b2) {
var cmd = new MenuDialogCommand(show, title, content, b1, b2, CorrelationId.EMPTY_CORRELATION);
for(var socket : serverManager.getServerConnections()) {
socket.sendCommand(cmd);
}
}
}