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b/recommendation-engine/src/main/java/eu/alfred/event_manager/client/EventManagerClient.java |
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package eu.alfred.event_manager.client;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import org.codehaus.jackson.map.ObjectMapper;
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import eu.alfred.event_manager.model.AnalyticsParameters;
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import eu.alfred.event_manager.model.Event;
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import eu.alfred.recommendations.util.DataTransformationsHandler;
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import eu.alfred.recommendations.util.WebServiceClient;
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/**
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* This class serves as a client for the services provided by the Event Manager.
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* It provides methods for performing CRUD operation on events and adding/deleting participants from events.
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*
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* @author tasos
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*
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*/
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public class EventManagerClient {
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private final String baseUrl = "http://80.241.219.213:1999/Alfred/";
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private DataTransformationsHandler dtHandler;
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private WebServiceClient wsClient;
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public EventManagerClient() {
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dtHandler = new DataTransformationsHandler();
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wsClient = new WebServiceClient();
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}
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/**
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* Retrieves an event entry from the EM, with the specified ID.
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*
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* @param eventId A String with the unique identification of the event.
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* @return The event with the specified ID, if successfully retrieved.
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*/
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public Event getEvent(String eventId) {
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String requestUrl = baseUrl +"Event?EventID="+eventId;
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// There can be only one event with a specific id. We use "get(0)" because of the generic "doGetRequest"
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// utility method which returns a List<Object>
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Event event = (Event)wsClient.doGetRequest(requestUrl, Event.class).get(0);
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return event;
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}
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/**
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* Creates a new entry of an event if the event doesn't exist, or updates the event if already present.
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*
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* @param newEvent The Event object for the new event entry.
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* @return The new Event entry created if the operation was successful, or null otherwise.
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*/
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public Event addEvent(Event newEvent) {
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String eventAsJson = dtHandler.mapObjectToJson(newEvent);
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String result = wsClient.doPostRequestToCreate(baseUrl + "AddEvent", eventAsJson);
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ObjectMapper mapper = new ObjectMapper();
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try {
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return (Event) mapper.readValue(result,Event.class);
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} catch (IOException e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* Deletes an event entry with the specified ID.
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*
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* @param eventId A String with the unique identification of the event to be deleted.
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* @return The Event that was deleted with the operation.
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*/
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public Object deleteEvent(String eventId) {
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String requestUrl = baseUrl +"DeleteEvent?EventID=" + eventId;
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Event deletedEvent = (Event) wsClient.doDeleteRequestEM(requestUrl, Event.class);
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// Why the hell Dimitri's service returns an event that was just now deleted?
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return deletedEvent;
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}
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/**
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* Retrieves a list of events from the Event Manager, based on parameters described in an AnalyticsParameters object.
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* The AnalyticsParameters object makes use of calculations of the OLAP cubes defined in the EM.
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*
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* @param parameters The AnalyticsParameters object with the parameters for filtering the events to be retrieved.
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* @return A List of Event objects which satisfy the defined parameters.
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*/
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public List<Event> getEvents(AnalyticsParameters parameters) {
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String paramsAsJson = dtHandler.mapObjectToJson(parameters);
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List<Event> events = (List<Event>)(List<?>) wsClient.doPostRequestToRetrieve(baseUrl +
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"QueryEvents", paramsAsJson, Event.class);
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return events;
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}
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/**
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* Adds a user with a specified Id as a participant in an event with a specified Id.
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*
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* @param eventId The unique identification of the event in which the user will participate.
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* @param participantId The unique identification of the user who will participate in the event
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* @return A Boolean indicating the success or failure of the operation
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*/
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public Boolean addParticipant(String eventId, String participantId) {
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Boolean operationResult= wsClient.doGetRequest(baseUrl + "AddParticipant?EventID="+eventId+"&UserID="+participantId);
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return operationResult;
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}
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/**
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* Deletes a user entry as a participant in an event.
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*
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* @param eventId he unique identification of the event from which the user will be removed as a participant.
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* @param participantId The unique identification of the user who will be removed as a participant in the event
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* @return A Boolean indicating the success or failure of the operation
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*/
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public Boolean deleteParticipant(String eventId, String participantId) {
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String operationResult= wsClient.doDeleteRequest(baseUrl + "AddParticipant?EventID="+eventId+"&UserID="+participantId);
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if(operationResult=="true")
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return true;
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return false;
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}
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}
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