Management of system items and events allows to choose types of events to be received, get these events and process them.

Attention! To launch this example at Wialon Kit, change http://hst-api.wialon.host for http://kit-api.wialon.host in all requests and use user name and password of your account to login to the system or name and password of demo user kitdemo kitdemo.

package com.wialon.java.test;
 
import com.wialon.core.Errors;
import com.wialon.core.EventHandler;
import com.wialon.core.EventProvider;
import com.wialon.core.Session;
import com.wialon.extra.UpdateSpec;
import com.wialon.item.Item;
import com.wialon.item.Unit;
import com.wialon.remote.handlers.ResponseHandler;
 
import java.io.IOException;
import java.util.Collection;
 
public class EventsManagementExample implements Runnable {
    private Session session;
 
    // Login to server
    private void login(){
        // initialize Wialon session
        session.initSession("http://hst-api.wialon.host");
        // trying login
        session.login("wialon_test", "test", new ResponseHandler() {
            @Override
            public void onSuccess(String response) {
                super.onSuccess(response);
                // login succeed
                System.out.println(String.format("Logged successfully. User name is %s", session.getCurrUser().getName()));
                //call update data flags
                updateDataFlags();
            }
 
            @Override
            public void onFailure(int errorCode, Throwable throwableError) {
                super.onFailure(errorCode, throwableError);
                // login failed, print error
                System.out.println(Errors.getErrorText(errorCode));
            }
        });
    }
 
    private void updateDataFlags(){
        //Create new update specification
        UpdateSpec updateSpec=new UpdateSpec();
        //Set update mode to add specified flags
        updateSpec.setMode(1);
        //Set update type by type
        updateSpec.setType("type");
        //Set update data to units
        updateSpec.setData(Item.ItemType.avl_unit);
        //Set update data flags
        updateSpec.setFlags(Item.dataFlag.base.getValue()| Unit.dataFlag.lastMessage.getValue());
        //Send update by created update specification
        session.updateDataFlags(new UpdateSpec[]{updateSpec}, new ResponseHandler() {
            @Override
            public void onSuccess(String response) {
                super.onSuccess(response);
                // Update succeed
                System.out.println("Update data flags is successful");
                bindEventsHandler();
            }
            @Override
            public void onFailure(int errorCode, Throwable throwableError) {
                super.onFailure(errorCode, throwableError);
                // update data flags failed, print error
                System.out.println(Errors.getErrorText(errorCode));
                logout();
            }
        });
    }
 
    private void bindEventsHandler(){
        //Get items from session
        Collection<Item> sessionItems=session.getItems();
        //Create events handler
        EventsHandlerExample eventsHandlerExample=new EventsHandlerExample();
        //Add handler to session
        session.addListener(eventsHandlerExample, EventProvider.events.All);
        if (sessionItems!=null && sessionItems.size()>0) {
            System.out.println(String.format("%d items added to Session\r\nStart binding event listeners to items", sessionItems.size()));
            //Add handler to items
            for (Item item : sessionItems)
                item.addListener(eventsHandlerExample, EventProvider.events.All);
            System.out.println("Event listeners successfully bound to items\r\nPress enter to logout and exit");
        }
        //Wait for press enter key
        try {
            System.in.read();
            logout();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    // Logout
    private void logout(){
        session.logout(new ResponseHandler() {
            @Override
            public void onSuccess(String response) {
                super.onSuccess(response);
                // logout succeed
                System.out.println("Logout successfully");
                System.exit(0);
            }
            @Override
            public void onFailure(int errorCode, Throwable throwableError) {
                super.onFailure(errorCode, throwableError);
                // logout failed, print error
                System.out.println(Errors.getErrorText(errorCode));
                System.exit(0);
            }
        });
    }
    //EventHandler witch listen bound event types
    private class EventsHandlerExample implements EventHandler{
        @Override
        public void onEvent(Enum event, Object object, Object oldData, Object newData) {
            String objectValue= object==null ? "null" : object.toString();
            String oldDataValue= oldData==null ? "null" : oldData.toString();
            String newDataValue= newData==null ? "null" : newData.toString();
            System.out.println(String.format("Fired event with type %s, object is %s, oldData is %s, newData is %s", event, objectValue, oldDataValue, newDataValue));
        }
    }
 
    @Override
    public void run() {
        // get instance of current Session
        session=Session.getInstance();
        login();
    }
 
    public static void main(String[] args){
        new Thread(new EventsManagementExample()).start();
    }
}