95 lines
3.3 KiB
Java
Executable File
95 lines
3.3 KiB
Java
Executable File
package envoy.server.processors;
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import java.io.IOException;
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import envoy.data.User.UserStatus;
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import envoy.event.UserStatusChangeEvent;
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import envoy.server.data.PersistenceManager;
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import envoy.server.data.User;
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import envoy.server.net.ConnectionManager;
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import envoy.server.net.ObjectWriteProxy;
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/**
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* This processor handles incoming {@link UserStatusChangeEvent}.<br>
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* <br>
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* Project: <strong>envoy-server-standalone</strong><br>
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* File: <strong>UserStatusChangeProcessor.java</strong><br>
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* Created: <strong>1 Feb 2020</strong><br>
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*
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* @author Leon Hofmeister
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public class UserStatusChangeProcessor implements ObjectProcessor<UserStatusChangeEvent> {
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private static ObjectWriteProxy writeProxy;
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private static PersistenceManager persistenceManager = PersistenceManager.getInstance();
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@Override
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public Class<UserStatusChangeEvent> getInputClass() { return UserStatusChangeEvent.class; }
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@Override
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public void process(UserStatusChangeEvent input, long socketID, ObjectWriteProxy writeProxy) throws IOException {
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// new status should not equal old status
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if (input.get().equals(persistenceManager.getUserByID(input.getID()).getStatus())) {
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System.out.println("Received an unnecessary UserStatusChangeEvent");
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return;
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}
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updateUserStatus(input);
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}
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/**
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* Sets the {@link UserStatus} for a given user. Both offline contacts and
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* currently online contacts are notified.
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*
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* @param user the {@link UserStatusChangeEvent} that signals the change
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public static void updateUserStatus(User user) {
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// handling for newly logged in clients
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persistenceManager.updateContact(user);
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// handling for contacts that are already online
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notifyContacts(user);
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}
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/**
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* @param evt the {@link UserStatusChangeEvent}
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public static void updateUserStatus(UserStatusChangeEvent evt) { updateUserStatus(persistenceManager.getUserByID(evt.getID())); }
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/**
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* notifies active contacts of this {@link User} that his {@link UserStatus} has
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* changed
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*
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* @param user the {@link User}
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* @since Envoy Server Standalone v0.1-alpha
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*/
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private static void notifyContacts(User user) {
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UserStatusChangeEvent evt = new UserStatusChangeEvent(user.getID(), user.getStatus());
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ConnectionManager connectionManager = ConnectionManager.getInstance();
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try {
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for (envoy.server.data.Contact contact : user.getContacts())
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if (connectionManager.isOnline(contact.getID())) writeProxy.write(connectionManager.getSocketId(contact.getID()), evt);
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} catch (IOException e) {
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e.printStackTrace();
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System.err.println("Could not notify online contacts of user " + evt.getID() + " that his status has been changed");
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}
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}
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/**
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* This method is only called by the LoginCredentialProcessor because every
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* user needs to login (open a socket) before changing his status.
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* Needed to ensure propagation of events because an uninitialized writeProxy
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* would cause problems.
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*
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* @param writeProxy the writeProxy that is used to send objects back to clients
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public static void setWriteProxy(ObjectWriteProxy writeProxy) { UserStatusChangeProcessor.writeProxy = writeProxy; }
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// TODO may cause an problem if two clients log in at the same time.
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// Change Needed.
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}
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