You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@unomi.apache.org by jk...@apache.org on 2022/08/05 14:18:59 UTC

[unomi] 01/01: UNOMI-522: event collector endpoint is now handling current visitor session and profile exactly like context.json endpoint

This is an automated email from the ASF dual-hosted git repository.

jkevan pushed a commit to branch eventCollectorSessionProfileHandling
in repository https://gitbox.apache.org/repos/asf/unomi.git

commit 3aa41e8c5ce596634c54161a28c9ce77564a54a4
Author: Kevan <ke...@jahia.com>
AuthorDate: Fri Aug 5 16:18:42 2022 +0200

    UNOMI-522: event collector endpoint is now handling current visitor session and profile exactly like context.json endpoint
---
 .../apache/unomi/api/EventsCollectorRequest.java   |  21 ++
 .../unomi/rest/endpoints/ContextJsonEndpoint.java  | 286 +++------------------
 .../rest/endpoints/EventsCollectorEndpoint.java    | 121 ++-------
 .../unomi/rest/service/RestServiceUtils.java       |  62 ++++-
 .../rest/service/impl/RestServiceUtilsImpl.java    | 255 +++++++++++++++---
 .../main/java/org/apache/unomi/utils/Changes.java  |  57 ----
 .../apache/unomi/utils/EventsRequestContext.java   | 121 +++++++++
 7 files changed, 484 insertions(+), 439 deletions(-)

diff --git a/api/src/main/java/org/apache/unomi/api/EventsCollectorRequest.java b/api/src/main/java/org/apache/unomi/api/EventsCollectorRequest.java
index 9eb4ee9ac..74f922eec 100644
--- a/api/src/main/java/org/apache/unomi/api/EventsCollectorRequest.java
+++ b/api/src/main/java/org/apache/unomi/api/EventsCollectorRequest.java
@@ -34,6 +34,9 @@ public class EventsCollectorRequest {
     @Pattern(regexp = ValidationPattern.TEXT_VALID_CHARACTERS_PATTERN)
     private String sessionId;
 
+    @Pattern(regexp = ValidationPattern.TEXT_VALID_CHARACTERS_PATTERN)
+    private String profileId;
+
     /**
      * Retrieves the events to be processed.
      *
@@ -67,4 +70,22 @@ public class EventsCollectorRequest {
         this.sessionId = sessionId;
     }
 
+    /**
+     * Retrieve the profileId passed along with the request. All events will be processed with this profileId as a
+     * default
+     *
+     * @return the identifier for the profile
+     */
+    public String getProfileId() {
+        return profileId;
+    }
+
+    /**
+     * Sets the profileId in the request.
+     *
+     * @param profileId an unique identifier for the profile
+     */
+    public void setProfileId(String profileId) {
+        this.profileId = profileId;
+    }
 }
diff --git a/rest/src/main/java/org/apache/unomi/rest/endpoints/ContextJsonEndpoint.java b/rest/src/main/java/org/apache/unomi/rest/endpoints/ContextJsonEndpoint.java
index da3debb20..6207845f8 100644
--- a/rest/src/main/java/org/apache/unomi/rest/endpoints/ContextJsonEndpoint.java
+++ b/rest/src/main/java/org/apache/unomi/rest/endpoints/ContextJsonEndpoint.java
@@ -20,7 +20,6 @@ package org.apache.unomi.rest.endpoints;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.node.JsonNodeFactory;
 import com.fasterxml.jackson.databind.node.ObjectNode;
-import org.apache.commons.lang3.StringUtils;
 import org.apache.cxf.rs.security.cors.CrossOriginResourceSharing;
 import org.apache.unomi.api.*;
 import org.apache.unomi.api.conditions.Condition;
@@ -29,8 +28,7 @@ import org.apache.unomi.persistence.spi.CustomObjectMapper;
 import org.apache.unomi.rest.exception.InvalidRequestException;
 import org.apache.unomi.rest.service.RestServiceUtils;
 import org.apache.unomi.schema.api.SchemaService;
-import org.apache.unomi.utils.Changes;
-import org.apache.unomi.utils.HttpUtils;
+import org.apache.unomi.utils.EventsRequestContext;
 import org.osgi.service.component.annotations.Component;
 import org.osgi.service.component.annotations.Reference;
 import org.slf4j.Logger;
@@ -38,8 +36,6 @@ import org.slf4j.LoggerFactory;
 
 import javax.jws.WebService;
 import javax.servlet.ServletContext;
-import javax.servlet.ServletRequest;
-import javax.servlet.ServletResponse;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.ws.rs.*;
@@ -53,7 +49,6 @@ import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.UUID;
 
 @WebService
 @Consumes(MediaType.APPLICATION_JSON)
@@ -63,9 +58,7 @@ import java.util.UUID;
 public class ContextJsonEndpoint {
     private static final Logger logger = LoggerFactory.getLogger(ContextJsonEndpoint.class.getName());
 
-    private static final String DEFAULT_CLIENT_ID = "defaultClientId";
-
-    private boolean sanitizeConditions = Boolean
+    private final boolean sanitizeConditions = Boolean
             .parseBoolean(System.getProperty("org.apache.unomi.security.personalization.sanitizeConditions", "true"));
 
     @Context
@@ -75,19 +68,13 @@ public class ContextJsonEndpoint {
     @Context
     HttpServletResponse response;
 
-    @Reference
-    private ProfileService profileService;
     @Reference
     private PrivacyService privacyService;
     @Reference
-    private EventService eventService;
-    @Reference
     private RulesService rulesService;
     @Reference
     private PersonalizationService personalizationService;
     @Reference
-    private ConfigSharingService configSharingService;
-    @Reference
     private RestServiceUtils restServiceUtils;
     @Reference
     private SchemaService schemaService;
@@ -147,10 +134,11 @@ public class ContextJsonEndpoint {
     @Produces(MediaType.APPLICATION_JSON + ";charset=UTF-8")
     @Path("/context.json")
     public ContextResponse contextJSONAsPost(ContextRequest contextRequest,
-            @QueryParam("personaId") String personaId,
-            @QueryParam("sessionId") String sessionId,
-            @QueryParam("timestamp") Long timestampAsLong, @QueryParam("invalidateProfile") boolean invalidateProfile,
-            @QueryParam("invalidateSession") boolean invalidateSession) {
+                                             @QueryParam("personaId") String personaId,
+                                             @QueryParam("sessionId") String sessionId,
+                                             @QueryParam("timestamp") Long timestampAsLong,
+                                             @QueryParam("invalidateProfile") boolean invalidateProfile,
+                                             @QueryParam("invalidateSession") boolean invalidateSession) {
 
         // Schema validation
         ObjectNode paramsAsJson = JsonNodeFactory.instance.objectNode();
@@ -159,233 +147,57 @@ public class ContextJsonEndpoint {
         if (!schemaService.isValid(paramsAsJson.toString(), "https://unomi.apache.org/schemas/json/rest/requestIds/1-0-0")) {
             throw new InvalidRequestException("Invalid parameter", "Invalid received data");
         }
+
+        // Generate timestamp
         Date timestamp = new Date();
         if (timestampAsLong != null) {
             timestamp = new Date(timestampAsLong);
         }
 
-        // Handle persona
-        Profile profile = null;
-        Session session = null;
+        // init ids
         String profileId = null;
-        if (personaId != null) {
-            PersonaWithSessions personaWithSessions = profileService.loadPersonaWithSessions(personaId);
-            if (personaWithSessions == null) {
-                logger.error("Couldn't find persona, please check your personaId parameter");
-                profile = null;
-            } else {
-                profile = personaWithSessions.getPersona();
-                session = personaWithSessions.getLastSession();
-            }
-        }
-
         String scope = null;
         if (contextRequest != null) {
-            if (contextRequest.getSource() != null) {
-                scope = contextRequest.getSource().getScope();
-            }
-
-            if (contextRequest.getSessionId() != null) {
-                sessionId = contextRequest.getSessionId();
-            }
-
+            scope = contextRequest.getSource() != null ? contextRequest.getSource().getScope() : scope;
+            sessionId = contextRequest.getSessionId() != null ? contextRequest.getSessionId() : sessionId;
             profileId = contextRequest.getProfileId();
         }
-        if (profileId == null) {
-            // Get profile id from the cookie
-            profileId = restServiceUtils.getProfileIdCookieValue(request);
-        }
-
-        if (profileId == null && sessionId == null && personaId == null) {
-            logger.error(
-                    "Couldn't find profileId, sessionId or personaId in incoming request! Stopped processing request. See debug level for more information");
-            if (logger.isDebugEnabled()) {
-                logger.debug("Request dump: {}", HttpUtils.dumpRequestInfo(request));
-            }
-            throw new BadRequestException("Couldn't find profileId, sessionId or personaId in incoming request!");
-        }
-
-        int changes = EventService.NO_CHANGE;
-
-        // Not a persona, resolve profile now
-        boolean profileCreated = false;
-
-        if (profile == null) {
-            if (profileId == null || invalidateProfile) {
-                // no profileId cookie was found or the profile has to be invalidated, we generate a new one and create the profile in the profile service
-                profile = createNewProfile(null, timestamp);
-                profileCreated = true;
-            } else {
-                profile = profileService.load(profileId);
-                if (profile == null) {
-                    // this can happen if we have an old cookie but have reset the server,
-                    // or if we merged the profiles and somehow this cookie didn't get updated.
-                    profile = createNewProfile(profileId, timestamp);
-                    profileCreated = true;
-                } else {
-                    Changes changesObject = checkMergedProfile(profile, session);
-                    changes |= changesObject.getChangeType();
-                    profile = changesObject.getProfile();
-                }
-            }
-
-            Profile sessionProfile;
-            if (StringUtils.isNotBlank(sessionId) && !invalidateSession) {
-                session = profileService.loadSession(sessionId, timestamp);
-                if (session != null) {
-                    sessionProfile = session.getProfile();
-
-                    boolean anonymousSessionProfile = sessionProfile.isAnonymousProfile();
-                    if (!profile.isAnonymousProfile() && !anonymousSessionProfile && !profile.getItemId()
-                            .equals(sessionProfile.getItemId())) {
-                        // Session user has been switched, profile id in cookie is not up to date
-                        // We must reload the profile with the session ID as some properties could be missing from the session profile
-                        // #personalIdentifier
-                        profile = profileService.load(sessionProfile.getItemId());
-                    }
-
-                    // Handle anonymous situation
-                    Boolean requireAnonymousBrowsing = privacyService.isRequireAnonymousBrowsing(profile);
-                    if (requireAnonymousBrowsing && anonymousSessionProfile) {
-                        // User wants to browse anonymously, anonymous profile is already set.
-                    } else if (requireAnonymousBrowsing && !anonymousSessionProfile) {
-                        // User wants to browse anonymously, update the sessionProfile to anonymous profile
-                        sessionProfile = privacyService.getAnonymousProfile(profile);
-                        session.setProfile(sessionProfile);
-                        changes |= EventService.SESSION_UPDATED;
-                    } else if (!requireAnonymousBrowsing && anonymousSessionProfile) {
-                        // User does not want to browse anonymously anymore, update the sessionProfile to real profile
-                        sessionProfile = profile;
-                        session.setProfile(sessionProfile);
-                        changes |= EventService.SESSION_UPDATED;
-                    } else if (!requireAnonymousBrowsing && !anonymousSessionProfile) {
-                        // User does not want to browse anonymously, use the real profile. Check that session contains the current profile.
-                        sessionProfile = profile;
-                        if (!session.getProfileId().equals(sessionProfile.getItemId())) {
-                            changes |= EventService.SESSION_UPDATED;
-                        }
-                        session.setProfile(sessionProfile);
-                    }
-                }
-            }
 
-            if (session == null || invalidateSession) {
-                sessionProfile = privacyService.isRequireAnonymousBrowsing(profile) ? privacyService.getAnonymousProfile(profile) : profile;
-
-                if (StringUtils.isNotBlank(sessionId)) {
-                    // Only save session and send event if a session id was provided, otherwise keep transient session
-                    session = new Session(sessionId, sessionProfile, timestamp, scope);
-                    changes |= EventService.SESSION_UPDATED;
-                    Event event = new Event("sessionCreated", session, profile, scope, null, session, null, timestamp, false);
-                    if (sessionProfile.isAnonymousProfile()) {
-                        // Do not keep track of profile in event
-                        event.setProfileId(null);
-                    }
-                    event.getAttributes().put(Event.HTTP_REQUEST_ATTRIBUTE, request);
-                    event.getAttributes().put(Event.HTTP_RESPONSE_ATTRIBUTE, response);
-                    if (logger.isDebugEnabled()) {
-                        logger.debug("Received event {} for profile={} session={} target={} timestamp={}", event.getEventType(),
-                                profile.getItemId(), session.getItemId(), event.getTarget(), timestamp);
-                    }
-                    changes |= eventService.send(event);
-                }
-            }
-
-            if (profileCreated) {
-                changes |= EventService.PROFILE_UPDATED;
-
-                Event profileUpdated = new Event("profileUpdated", session, profile, scope, null, profile, timestamp);
-                profileUpdated.setPersistent(false);
-                profileUpdated.getAttributes().put(Event.HTTP_REQUEST_ATTRIBUTE, request);
-                profileUpdated.getAttributes().put(Event.HTTP_RESPONSE_ATTRIBUTE, response);
-                profileUpdated.getAttributes().put(Event.CLIENT_ID_ATTRIBUTE, DEFAULT_CLIENT_ID);
-
-                if (logger.isDebugEnabled()) {
-                    logger.debug("Received event {} for profile={} {} target={} timestamp={}", profileUpdated.getEventType(),
-                            profile.getItemId(), " session=" + (session != null ? session.getItemId() : null), profileUpdated.getTarget(),
-                            timestamp);
-                }
-                changes |= eventService.send(profileUpdated);
-            }
-        }
+        // build public context, profile + session creation/anonymous etc ...
+        EventsRequestContext eventsRequestContext = restServiceUtils.initEventsRequest(scope, sessionId, profileId,
+                personaId, invalidateProfile, invalidateSession, request, response, timestamp);
 
+        // Build response
         ContextResponse contextResponse = new ContextResponse();
-        contextResponse.setProfileId(profile.getItemId());
-        if (session != null) {
-            contextResponse.setSessionId(session.getItemId());
-        } else if (sessionId != null) {
-            contextResponse.setSessionId(sessionId);
-        }
-
         if (contextRequest != null) {
-            Changes changesObject = handleRequest(contextRequest, session, profile, contextResponse, request, response, timestamp);
-            changes |= changesObject.getChangeType();
-            profile = changesObject.getProfile();
+            eventsRequestContext = processContextRequest(contextRequest, contextResponse, eventsRequestContext);
         }
 
-        if ((changes & EventService.PROFILE_UPDATED) == EventService.PROFILE_UPDATED) {
-            profileService.save(profile);
-            contextResponse.setProfileId(profile.getItemId());
+        // finalize request, save profile and session if necessary and return profileId cookie in response
+        restServiceUtils.finalizeEventsRequest(eventsRequestContext, false);
 
-            if (profileCreated) {
-                String clientId = contextRequest != null && contextRequest.getClientId() != null ? contextRequest.getClientId() : DEFAULT_CLIENT_ID;
-                String profileMasterId = profile.getMergedWith() != null ? profile.getMergedWith() : profile.getItemId();
-                profileService.addAliasToProfile(profileMasterId, profile.getItemId(), clientId );
-            }
-        }
-        if ((changes & EventService.SESSION_UPDATED) == EventService.SESSION_UPDATED && session != null) {
-            profileService.saveSession(session);
-            contextResponse.setSessionId(session.getItemId());
-        }
-
-        if ((changes & EventService.ERROR) == EventService.ERROR) {
-            response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
-        }
-        // Set profile cookie
-        if (!(profile instanceof Persona)) {
-            response.setHeader("Set-Cookie", HttpUtils.getProfileCookieString(profile, configSharingService, request.isSecure()));
+        contextResponse.setProfileId(eventsRequestContext.getProfile().getItemId());
+        if (eventsRequestContext.getSession() != null) {
+            contextResponse.setSessionId(eventsRequestContext.getSession().getItemId());
+        } else if (sessionId != null) {
+            contextResponse.setSessionId(sessionId);
         }
         return contextResponse;
     }
 
-    private Changes checkMergedProfile(Profile profile, Session session) {
-        int changes = EventService.NO_CHANGE;
-        if (profile.getMergedWith() != null && !privacyService.isRequireAnonymousBrowsing(profile) && !profile.isAnonymousProfile()) {
-            Profile currentProfile = profile;
-            String masterProfileId = profile.getMergedWith();
-            Profile masterProfile = profileService.load(masterProfileId);
-            if (masterProfile != null) {
-                logger.info("Current profile {} was merged with profile {}, replacing profile in session", currentProfile.getItemId(),
-                        masterProfileId);
-                profile = masterProfile;
-                if (session != null) {
-                    session.setProfile(profile);
-                    changes = EventService.SESSION_UPDATED;
-                }
-            } else {
-                logger.warn("Couldn't find merged profile {}, falling back to profile {}", masterProfileId, currentProfile.getItemId());
-                profile.setMergedWith(null);
-                changes = EventService.PROFILE_UPDATED;
-            }
-        }
-
-        return new Changes(changes, profile);
-    }
-
-    private Changes handleRequest(ContextRequest contextRequest, Session session, Profile profile, ContextResponse data,
-            ServletRequest request, ServletResponse response, Date timestamp) {
+    private EventsRequestContext processContextRequest(ContextRequest contextRequest, ContextResponse data, EventsRequestContext eventsRequestContext) {
 
-        processOverrides(contextRequest, profile, session);
+        processOverrides(contextRequest, eventsRequestContext.getProfile(), eventsRequestContext.getSession());
 
-        Changes changes = restServiceUtils.handleEvents(contextRequest.getEvents(), session, profile, request, response, timestamp);
-        data.setProcessedEvents(changes.getProcessedItems());
+        eventsRequestContext = restServiceUtils.performEventsRequest(contextRequest.getEvents(), eventsRequestContext);
+        data.setProcessedEvents(eventsRequestContext.getProcessedItems());
 
         List<PersonalizationService.PersonalizedContent> filterNodes = contextRequest.getFilters();
         if (filterNodes != null) {
             data.setFilteringResults(new HashMap<>());
             for (PersonalizationService.PersonalizedContent personalizedContent : sanitizePersonalizedContentObjects(filterNodes)) {
                 data.getFilteringResults()
-                        .put(personalizedContent.getId(), personalizationService.filter(profile, session, personalizedContent));
+                        .put(personalizedContent.getId(), personalizationService.filter(eventsRequestContext.getProfile(), eventsRequestContext.getSession(), personalizedContent));
             }
         }
 
@@ -393,34 +205,31 @@ public class ContextJsonEndpoint {
         if (personalizations != null) {
             data.setPersonalizations(new HashMap<>());
             for (PersonalizationService.PersonalizationRequest personalization : sanitizePersonalizations(personalizations)) {
-                PersonalizationResult personalizationResult = personalizationService.personalizeList(profile, session, personalization);
-                changes.setChangeType(changes.getChangeType() | personalizationResult.getChangeType());
-                data.getPersonalizations()
-                        .put(personalization.getId(), personalizationResult.getContentIds());
+                PersonalizationResult personalizationResult = personalizationService.personalizeList(eventsRequestContext.getProfile(), eventsRequestContext.getSession(), personalization);
+                eventsRequestContext.addChanges(personalizationResult.getChangeType());
+                data.getPersonalizations().put(personalization.getId(), personalizationResult.getContentIds());
             }
         }
 
-        profile = changes.getProfile();
-
         if (contextRequest.isRequireSegments()) {
-            data.setProfileSegments(profile.getSegments());
+            data.setProfileSegments(eventsRequestContext.getProfile().getSegments());
         }
         if (contextRequest.isRequireScores()) {
-            data.setProfileScores(profile.getScores());
+            data.setProfileScores(eventsRequestContext.getProfile().getScores());
         }
 
         if (contextRequest.getRequiredProfileProperties() != null) {
-            Map<String, Object> profileProperties = new HashMap<>(profile.getProperties());
+            Map<String, Object> profileProperties = new HashMap<>(eventsRequestContext.getProfile().getProperties());
             if (!contextRequest.getRequiredProfileProperties().contains("*")) {
                 profileProperties.keySet().retainAll(contextRequest.getRequiredProfileProperties());
             }
             data.setProfileProperties(profileProperties);
         }
 
-        if (session != null) {
-            data.setSessionId(session.getItemId());
+        if (eventsRequestContext.getSession() != null) {
+            data.setSessionId(eventsRequestContext.getSession().getItemId());
             if (contextRequest.getRequiredSessionProperties() != null) {
-                Map<String, Object> sessionProperties = new HashMap<>(session.getProperties());
+                Map<String, Object> sessionProperties = new HashMap<>(eventsRequestContext.getSession().getProperties());
                 if (!contextRequest.getRequiredSessionProperties().contains("*")) {
                     sessionProperties.keySet().retainAll(contextRequest.getRequiredSessionProperties());
                 }
@@ -428,16 +237,16 @@ public class ContextJsonEndpoint {
             }
         }
 
-        if (!(profile instanceof Persona)) {
+        if (!(eventsRequestContext.getProfile() instanceof Persona)) {
             data.setTrackedConditions(rulesService.getTrackedConditions(contextRequest.getSource()));
         } else {
             data.setTrackedConditions(Collections.emptySet());
         }
 
-        data.setAnonymousBrowsing(privacyService.isRequireAnonymousBrowsing(profile));
-        data.setConsents(profile.getConsents());
+        data.setAnonymousBrowsing(privacyService.isRequireAnonymousBrowsing(eventsRequestContext.getProfile()));
+        data.setConsents(eventsRequestContext.getProfile().getConsents());
 
-        return changes;
+        return eventsRequestContext;
     }
 
     /**
@@ -467,17 +276,6 @@ public class ContextJsonEndpoint {
         }
     }
 
-    private Profile createNewProfile(String existingProfileId, Date timestamp) {
-        Profile profile;
-        String profileId = existingProfileId;
-        if (profileId == null) {
-            profileId = UUID.randomUUID().toString();
-        }
-        profile = new Profile(profileId);
-        profile.setProperty("firstVisit", timestamp);
-        return profile;
-    }
-
     public void destroy() {
         logger.info("Context servlet shutdown.");
     }
diff --git a/rest/src/main/java/org/apache/unomi/rest/endpoints/EventsCollectorEndpoint.java b/rest/src/main/java/org/apache/unomi/rest/endpoints/EventsCollectorEndpoint.java
index 8911402a2..f727b352f 100644
--- a/rest/src/main/java/org/apache/unomi/rest/endpoints/EventsCollectorEndpoint.java
+++ b/rest/src/main/java/org/apache/unomi/rest/endpoints/EventsCollectorEndpoint.java
@@ -21,28 +21,16 @@ import org.apache.commons.lang3.StringUtils;
 import org.apache.cxf.rs.security.cors.CrossOriginResourceSharing;
 import org.apache.unomi.api.Event;
 import org.apache.unomi.api.EventsCollectorRequest;
-import org.apache.unomi.api.Persona;
-import org.apache.unomi.api.Profile;
-import org.apache.unomi.api.Session;
-import org.apache.unomi.api.services.ConfigSharingService;
-import org.apache.unomi.api.services.EventService;
-import org.apache.unomi.api.services.PrivacyService;
-import org.apache.unomi.api.services.ProfileService;
 import org.apache.unomi.rest.exception.InvalidRequestException;
 import org.apache.unomi.rest.models.EventCollectorResponse;
 import org.apache.unomi.rest.service.RestServiceUtils;
-import org.apache.unomi.utils.Changes;
+import org.apache.unomi.utils.EventsRequestContext;
 import org.osgi.service.component.annotations.Component;
 import org.osgi.service.component.annotations.Reference;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import javax.jws.WebService;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
-import javax.validation.Valid;
-import javax.validation.constraints.NotNull;
-import javax.ws.rs.BadRequestException;
 import javax.ws.rs.Consumes;
 import javax.ws.rs.GET;
 import javax.ws.rs.OPTIONS;
@@ -54,7 +42,6 @@ import javax.ws.rs.core.Context;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.util.Date;
-import java.util.UUID;
 
 @WebService
 @Produces(MediaType.APPLICATION_JSON + ";charset=UTF-8")
@@ -63,16 +50,7 @@ import java.util.UUID;
 @Path("/")
 @Component(service = EventsCollectorEndpoint.class, property = "osgi.jaxrs.resource=true")
 public class EventsCollectorEndpoint {
-    private static final Logger logger = LoggerFactory.getLogger(EventsCollectorEndpoint.class.getName());
 
-    @Reference
-    private EventService eventService;
-    @Reference
-    private ProfileService profileService;
-    @Reference
-    private PrivacyService privacyService;
-    @Reference
-    private ConfigSharingService configSharingService;
     @Reference
     private RestServiceUtils restServiceUtils;
 
@@ -114,87 +92,34 @@ public class EventsCollectorEndpoint {
         if (sessionId == null) {
             sessionId = request.getParameter("sessionId");
         }
-        Session session = null;
-        if (sessionId != null) {
-            session = profileService.loadSession(sessionId, timestamp);
-        }
-        Profile profile = null;
-        if (session == null) {
-            String scope = "systemscope";
-            // Get the first available scope that is not equal to systemscope to create the session otherwise systemscope will be used
-            for (Event event : eventsCollectorRequest.getEvents()) {
-                if (StringUtils.isNotBlank(event.getEventType())) {
-                    if (StringUtils.isNotBlank(event.getScope()) && !event.getScope().equals("systemscope")) {
-                        scope = event.getScope();
-                        break;
-                    } else if (event.getSource() != null && StringUtils.isNotBlank(event.getSource().getScope()) && !event.getSource()
-                            .getScope().equals("systemscope")) {
-                        scope = event.getSource().getScope();
-                        break;
-                    }
-                }
-            }
-            logger.debug("scope is now {}", scope);
-            String cookieProfileId = restServiceUtils.getProfileIdCookieValue(request);
-            if (StringUtils.isNotBlank(cookieProfileId)) {
-                profile = profileService.load(cookieProfileId);
-            }
-            if (profile == null) {
-                // Create non persisted profile to create the session
-                profile = new Profile("temp_" + UUID.randomUUID().toString());
-                profile.setProperty("firstVisit", timestamp);
-            }
-            /*
-            // Create anonymous profile so we don't keep track of the temp profile anywhere
-            Profile anonymousProfile = privacyService.getAnonymousProfile(profile);
-            // Create new session which should not be persisted as well as the temp profile
-            session = new Session(sessionId, anonymousProfile, timestamp, scope);
-            if (logger.isDebugEnabled()) {
-                logger.debug("No session found for sessionId={}, creating new session!", sessionId);
-            }
-            */
-        } else {
-            Profile sessionProfile = session.getProfile();
-            final String errorMessage = String
-                    .format("No valid profile found or persona found for profileId=%s, aborting request !", session.getProfileId());
-            if (sessionProfile.getItemId() != null) {
-                // Reload up-to-date profile
-                profile = profileService.load(sessionProfile.getItemId());
-                if (profile == null || profile instanceof Persona) {
-                    logger.error(errorMessage);
-                    throw new BadRequestException(errorMessage);
-                }
-            } else {
-                // Session uses anonymous profile, try to find profile from cookie
-                String cookieProfileId = restServiceUtils.getProfileIdCookieValue(request);
-                if (StringUtils.isNotBlank(cookieProfileId)) {
-                    profile = profileService.load(cookieProfileId);
-                }
 
-                if (profile == null) {
-                    logger.error(errorMessage);
-                    throw new BadRequestException(errorMessage);
+        String profileId = eventsCollectorRequest.getProfileId();
+        // Get the first available scope that is not equal to systemscope otherwise systemscope will be used
+        String scope = "systemscope";
+        for (Event event : eventsCollectorRequest.getEvents()) {
+            if (StringUtils.isNotBlank(event.getEventType())) {
+                if (StringUtils.isNotBlank(event.getScope()) && !event.getScope().equals("systemscope")) {
+                    scope = event.getScope();
+                    break;
+                } else if (event.getSource() != null &&
+                        StringUtils.isNotBlank(event.getSource().getScope()) &&
+                        !event.getSource().getScope().equals("systemscope")) {
+                    scope = event.getSource().getScope();
+                    break;
                 }
             }
         }
 
-        Changes changesObject = restServiceUtils
-                .handleEvents(eventsCollectorRequest.getEvents(), session, profile, request, response, timestamp);
-        int changes = changesObject.getChangeType();
-        profile = changesObject.getProfile();
+        // build public context, profile + session creation/anonymous etc ...
+        EventsRequestContext eventsRequestContext = restServiceUtils.initEventsRequest(scope, sessionId, profileId,
+                null, false, false, request, response, timestamp);
 
-        if ((changes & EventService.PROFILE_UPDATED) == EventService.PROFILE_UPDATED) {
-            profileService.save(profile);
-        }
-        if ((changes & EventService.SESSION_UPDATED) == EventService.SESSION_UPDATED && session != null) {
-            profileService.saveSession(session);
-        }
-        if ((changes & EventService.ERROR) == EventService.ERROR) {
-            String errorMessage = "Error processing events. Total number of processed events: " + changesObject.getProcessedItems() + "/"
-                    + eventsCollectorRequest.getEvents().size();
-            throw new BadRequestException(errorMessage);
-        }
+        // process events
+        eventsRequestContext = restServiceUtils.performEventsRequest(eventsCollectorRequest.getEvents(), eventsRequestContext);
+
+        // finalize request
+        restServiceUtils.finalizeEventsRequest(eventsRequestContext, true);
 
-        return new EventCollectorResponse(changes);
+        return new EventCollectorResponse(eventsRequestContext.getChanges());
     }
 }
diff --git a/rest/src/main/java/org/apache/unomi/rest/service/RestServiceUtils.java b/rest/src/main/java/org/apache/unomi/rest/service/RestServiceUtils.java
index e64db1485..0e6a9ba11 100644
--- a/rest/src/main/java/org/apache/unomi/rest/service/RestServiceUtils.java
+++ b/rest/src/main/java/org/apache/unomi/rest/service/RestServiceUtils.java
@@ -18,19 +18,65 @@
 package org.apache.unomi.rest.service;
 
 import org.apache.unomi.api.Event;
-import org.apache.unomi.api.Profile;
-import org.apache.unomi.api.Session;
-import org.apache.unomi.utils.Changes;
+import org.apache.unomi.utils.EventsRequestContext;
 
-import javax.servlet.ServletRequest;
-import javax.servlet.ServletResponse;
 import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
 import java.util.Date;
 import java.util.List;
 
+/**
+ * Utility service for Public REST endpoints
+ */
 public interface RestServiceUtils {
-    String getProfileIdCookieValue(HttpServletRequest httpServletRequest);
+    /**
+     * This method is used to initialize the context for a request that would require executing events.
+     *
+     * It will load existing profile/session for current user or build new ones if necessary
+     * IT will also handle anonymous profile/session preferences in case there is specific ones.
+     * It will also handle persona in case it is provided
+     * And finally it will provide a contextual bean named: EventsRequestContext,
+     * that will contain all the required information for the next steps of the request, like: processing the events
+     *
+     * @param scope the current scope (mandatory, in case session need to be created)
+     * @param sessionId the current sessionId (mandatory)
+     * @param profileId the current profileId (optional in case profile doesn't exists yet for incoming visitor)
+     * @param personaId the current personaId (optional in case we don't want to apply persona on current request)
+     * @param invalidateProfile true in case we want to invalidate the current visitor profile, false otherwise
+     * @param invalidateSession true in case we want to invalidate the current visitor session, false otherwise
+     * @param request the current request
+     * @param response the current request response
+     * @param timestamp the current date, for timestamp the current visitor data
+     *
+     * @return the built EventsRequestContext
+     */
+    EventsRequestContext initEventsRequest(String scope, String sessionId, String profileId, String personaId,
+                                           boolean invalidateProfile, boolean invalidateSession,
+                                           HttpServletRequest request, HttpServletResponse response,
+                                           Date timestamp);
+
+    /**
+     * Execute the list of events using the dedicated eventsRequestContext
+     * @param events the list of events to he executed
+     * @param eventsRequestContext the current EventsRequestContext
+     * @return an updated version of the current eventsRequestContext
+     */
+    EventsRequestContext performEventsRequest(List<Event> events, EventsRequestContext eventsRequestContext);
 
-    Changes handleEvents(List<Event> events, Session session, Profile profile, ServletRequest request, ServletResponse response,
-            Date timestamp);
+    /**
+     * At the end of an events requests we want to save/update the profile and/or the session depending on the changes
+     * Also we want to return a cookie about current visitor profile ID
+     *
+     * @param eventsRequestContext the current EventsRequestContext
+     * @param crashOnError true if we want to throw an Exception in case of errors during events execution,
+     *                     false otherwise (otherwise, no exception, but just an error code directly returned to the HTTP response)
+     */
+    void finalizeEventsRequest(EventsRequestContext eventsRequestContext, boolean crashOnError);
+
+    /**
+     * Try to extract the current visitor profileId from the current request cookies.
+     * @param httpServletRequest the current HTTP request
+     * @return the profileId if found in the cookies, null otherwise
+     */
+    String getProfileIdCookieValue(HttpServletRequest httpServletRequest);
 }
diff --git a/rest/src/main/java/org/apache/unomi/rest/service/impl/RestServiceUtilsImpl.java b/rest/src/main/java/org/apache/unomi/rest/service/impl/RestServiceUtilsImpl.java
index fae86daa2..75a98d1e1 100644
--- a/rest/src/main/java/org/apache/unomi/rest/service/impl/RestServiceUtilsImpl.java
+++ b/rest/src/main/java/org/apache/unomi/rest/service/impl/RestServiceUtilsImpl.java
@@ -17,32 +17,35 @@
 package org.apache.unomi.rest.service.impl;
 
 import com.fasterxml.jackson.databind.node.JsonNodeFactory;
-import org.apache.unomi.api.Event;
-import org.apache.unomi.api.Persona;
-import org.apache.unomi.api.Profile;
-import org.apache.unomi.api.Session;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.unomi.api.*;
 import org.apache.unomi.api.services.ConfigSharingService;
 import org.apache.unomi.api.services.EventService;
 import org.apache.unomi.api.services.PrivacyService;
+import org.apache.unomi.api.services.ProfileService;
 import org.apache.unomi.rest.exception.InvalidRequestException;
 import org.apache.unomi.rest.service.RestServiceUtils;
 import org.apache.unomi.schema.api.SchemaService;
-import org.apache.unomi.utils.Changes;
+import org.apache.unomi.utils.HttpUtils;
+import org.apache.unomi.utils.EventsRequestContext;
 import org.osgi.service.component.annotations.Component;
 import org.osgi.service.component.annotations.Reference;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import javax.servlet.ServletRequest;
-import javax.servlet.ServletResponse;
 import javax.servlet.http.Cookie;
 import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.ws.rs.BadRequestException;
 import java.util.Date;
 import java.util.List;
+import java.util.UUID;
 
 @Component(service = RestServiceUtils.class)
 public class RestServiceUtilsImpl implements RestServiceUtils {
 
+    private static final String DEFAULT_CLIENT_ID = "defaultClientId";
+
     private static final Logger logger = LoggerFactory.getLogger(RestServiceUtilsImpl.class.getName());
 
     @Reference
@@ -54,9 +57,13 @@ public class RestServiceUtilsImpl implements RestServiceUtils {
     @Reference
     private EventService eventService;
 
+    @Reference
+    private ProfileService profileService;
+
     @Reference
     SchemaService schemaService;
 
+    @Override
     public String getProfileIdCookieValue(HttpServletRequest httpServletRequest) {
         String cookieProfileId = null;
 
@@ -78,59 +85,243 @@ public class RestServiceUtilsImpl implements RestServiceUtils {
     }
 
     @Override
-    public Changes handleEvents(List<Event> events, Session session, Profile profile, ServletRequest request, ServletResponse response,
-            Date timestamp) {
-        List<String> filteredEventTypes = privacyService.getFilteredEventTypes(profile);
+    public EventsRequestContext initEventsRequest(String scope, String sessionId, String profileId, String personaId,
+                                                  boolean invalidateProfile, boolean invalidateSession,
+                                                  HttpServletRequest request, HttpServletResponse response, Date timestamp) {
+
+        // Build context
+        EventsRequestContext eventsRequestContext = new EventsRequestContext(timestamp, null, null, request, response);
+
+        // Handle persona
+        if (personaId != null) {
+            PersonaWithSessions personaWithSessions = profileService.loadPersonaWithSessions(personaId);
+            if (personaWithSessions == null) {
+                logger.error("Couldn't find persona, please check your personaId parameter");
+            } else {
+                eventsRequestContext.setProfile(personaWithSessions.getPersona());
+                eventsRequestContext.setSession(personaWithSessions.getLastSession());
+            }
+        }
+
+        if (profileId == null) {
+            // Get profile id from the cookie
+            profileId = getProfileIdCookieValue(request);
+        }
+
+        if (profileId == null && sessionId == null && personaId == null) {
+            logger.error("Couldn't find profileId, sessionId or personaId in incoming request! Stopped processing request. See debug level for more information");
+            if (logger.isDebugEnabled()) {
+                logger.debug("Request dump: {}", HttpUtils.dumpRequestInfo(request));
+            }
+            throw new BadRequestException("Couldn't find profileId, sessionId or personaId in incoming request!");
+        }
+
+        boolean profileCreated = false;
+        if (eventsRequestContext.getProfile() == null) {
+            if (profileId == null || invalidateProfile) {
+                // no profileId cookie was found or the profile has to be invalidated, we generate a new one and create the profile in the profile service
+                eventsRequestContext.setProfile(createNewProfile(null, timestamp));
+                profileCreated = true;
+            } else {
+                eventsRequestContext.setProfile(profileService.load(profileId));
+                if (eventsRequestContext.getProfile() == null) {
+                    // this can happen if we have an old cookie but have reset the server,
+                    // or if we merged the profiles and somehow this cookie didn't get updated.
+                    eventsRequestContext.setProfile(createNewProfile(profileId, timestamp));
+                    profileCreated = true;
+                }
+            }
+
+            // Try to recover existing session
+            Profile sessionProfile;
+            if (StringUtils.isNotBlank(sessionId) && !invalidateSession) {
+
+                eventsRequestContext.setSession(profileService.loadSession(sessionId, timestamp));
+                if (eventsRequestContext.getSession() != null) {
+
+                    sessionProfile = eventsRequestContext.getSession().getProfile();
+                    boolean anonymousSessionProfile = sessionProfile.isAnonymousProfile();
+                    if (!eventsRequestContext.getProfile().isAnonymousProfile() &&
+                            !anonymousSessionProfile &&
+                            !eventsRequestContext.getProfile().getItemId().equals(sessionProfile.getItemId())) {
+                        // Session user has been switched, profile id in cookie is not up to date
+                        // We must reload the profile with the session ID as some properties could be missing from the session profile
+                        // #personalIdentifier
+                        eventsRequestContext.setProfile(profileService.load(sessionProfile.getItemId()));
+                    }
+
+                    // Handle anonymous situation
+                    Boolean requireAnonymousBrowsing = privacyService.isRequireAnonymousBrowsing(eventsRequestContext.getProfile());
+                    if (requireAnonymousBrowsing && anonymousSessionProfile) {
+                        // User wants to browse anonymously, anonymous profile is already set.
+                    } else if (requireAnonymousBrowsing && !anonymousSessionProfile) {
+                        // User wants to browse anonymously, update the sessionProfile to anonymous profile
+                        sessionProfile = privacyService.getAnonymousProfile(eventsRequestContext.getProfile());
+                        eventsRequestContext.getSession().setProfile(sessionProfile);
+                        eventsRequestContext.addChanges(EventService.SESSION_UPDATED);
+                    } else if (!requireAnonymousBrowsing && anonymousSessionProfile) {
+                        // User does not want to browse anonymously anymore, update the sessionProfile to real profile
+                        sessionProfile = eventsRequestContext.getProfile();
+                        eventsRequestContext.getSession().setProfile(sessionProfile);
+                        eventsRequestContext.addChanges(EventService.SESSION_UPDATED);
+                    } else if (!requireAnonymousBrowsing && !anonymousSessionProfile) {
+                        // User does not want to browse anonymously, use the real profile. Check that session contains the current profile.
+                        sessionProfile = eventsRequestContext.getProfile();
+                        if (!eventsRequestContext.getSession().getProfileId().equals(sessionProfile.getItemId())) {
+                            eventsRequestContext.addChanges(EventService.SESSION_UPDATED);
+                        }
+                        eventsRequestContext.getSession().setProfile(sessionProfile);
+                    }
+                }
+            }
+
+            // Try to create new session
+            if (eventsRequestContext.getSession() == null || invalidateSession) {
+                sessionProfile = privacyService.isRequireAnonymousBrowsing(eventsRequestContext.getProfile()) ?
+                        privacyService.getAnonymousProfile(eventsRequestContext.getProfile()) : eventsRequestContext.getProfile();
+
+                if (StringUtils.isNotBlank(sessionId)) {
+                    // Only save session and send event if a session id was provided, otherwise keep transient session
+                    eventsRequestContext.setSession(new Session(sessionId, sessionProfile, timestamp, scope));
+                    eventsRequestContext.addChanges(EventService.SESSION_UPDATED);
+
+                    Event event = new Event("sessionCreated", eventsRequestContext.getSession(), eventsRequestContext.getProfile(),
+                            scope, null, eventsRequestContext.getSession(), null, timestamp, false);
+                    if (sessionProfile.isAnonymousProfile()) {
+                        // Do not keep track of profile in event
+                        event.setProfileId(null);
+                    }
+                    event.getAttributes().put(Event.HTTP_REQUEST_ATTRIBUTE, request);
+                    event.getAttributes().put(Event.HTTP_RESPONSE_ATTRIBUTE, response);
+                    if (logger.isDebugEnabled()) {
+                        logger.debug("Received event {} for profile={} session={} target={} timestamp={}", event.getEventType(),
+                                eventsRequestContext.getProfile().getItemId(), eventsRequestContext.getSession().getItemId(), event.getTarget(), timestamp);
+                    }
+                    eventsRequestContext.addChanges(eventService.send(event));
+                }
+            }
+
+            // Handle new profile creation
+            if (profileCreated) {
+                eventsRequestContext.addChanges(EventService.PROFILE_UPDATED);
 
-        String thirdPartyId = eventService
-                .authenticateThirdPartyServer(((HttpServletRequest) request).getHeader("X-Unomi-Peer"), request.getRemoteAddr());
+                Event profileUpdated = new Event("profileUpdated", eventsRequestContext.getSession(), eventsRequestContext.getProfile(),
+                        scope, null, eventsRequestContext.getProfile(), timestamp);
+                profileUpdated.setPersistent(false);
+                profileUpdated.getAttributes().put(Event.HTTP_REQUEST_ATTRIBUTE, request);
+                profileUpdated.getAttributes().put(Event.HTTP_RESPONSE_ATTRIBUTE, response);
+                profileUpdated.getAttributes().put(Event.CLIENT_ID_ATTRIBUTE, DEFAULT_CLIENT_ID);
+
+                if (logger.isDebugEnabled()) {
+                    logger.debug("Received event {} for profile={} {} target={} timestamp={}", profileUpdated.getEventType(),
+                            eventsRequestContext.getProfile().getItemId(),
+                            " session=" + (eventsRequestContext.getSession() != null ? eventsRequestContext.getSession().getItemId() : null),
+                            profileUpdated.getTarget(), timestamp);
+                }
+                eventsRequestContext.addChanges(eventService.send(profileUpdated));
+            }
+        }
+
+        return eventsRequestContext;
+    }
+
+    @Override
+    public EventsRequestContext performEventsRequest(List<Event> events, EventsRequestContext eventsRequestContext) {
+        List<String> filteredEventTypes = privacyService.getFilteredEventTypes(eventsRequestContext.getProfile());
+        String thirdPartyId = eventService.authenticateThirdPartyServer(eventsRequestContext.getRequest().getHeader("X-Unomi-Peer"),
+                eventsRequestContext.getRequest().getRemoteAddr());
 
-        int changes = EventService.NO_CHANGE;
         // execute provided events if any
-        int processedEventsCnt = 0;
-        if (events != null && !(profile instanceof Persona)) {
+        if (events != null && !(eventsRequestContext.getProfile() instanceof Persona)) {
+            // set Total items on context
+            eventsRequestContext.setTotalItems(events.size());
+
             for (Event event : events) {
-                processedEventsCnt++;
+                eventsRequestContext.setProcessedItems(eventsRequestContext.getProcessedItems() + 1);
+
                 if (event.getEventType() != null) {
-                    Event eventToSend = new Event(event.getEventType(), session, profile, event.getScope(), event.getSource(),
-                            event.getTarget(), event.getProperties(), timestamp, event.isPersistent());
+                    Event eventToSend = new Event(event.getEventType(), eventsRequestContext.getSession(), eventsRequestContext.getProfile(), event.getScope(), event.getSource(),
+                            event.getTarget(), event.getProperties(), eventsRequestContext.getTimestamp(), event.isPersistent());
                     eventToSend.setFlattenedProperties(event.getFlattenedProperties());
                     if (!eventService.isEventAllowed(event, thirdPartyId)) {
                         logger.warn("Event is not allowed : {}", event.getEventType());
                         continue;
                     }
                     if (thirdPartyId != null && event.getItemId() != null) {
-                        eventToSend = new Event(event.getItemId(), event.getEventType(), session, profile, event.getScope(),
-                                event.getSource(), event.getTarget(), event.getProperties(), timestamp, event.isPersistent());
+                        eventToSend = new Event(event.getItemId(), event.getEventType(), eventsRequestContext.getSession(), eventsRequestContext.getProfile(), event.getScope(),
+                                event.getSource(), event.getTarget(), event.getProperties(), eventsRequestContext.getTimestamp(), event.isPersistent());
                         eventToSend.setFlattenedProperties(event.getFlattenedProperties());
                     }
                     if (filteredEventTypes != null && filteredEventTypes.contains(event.getEventType())) {
                         logger.debug("Profile is filtering event type {}", event.getEventType());
                         continue;
                     }
-                    if (profile.isAnonymousProfile()) {
+                    if (eventsRequestContext.getProfile().isAnonymousProfile()) {
                         // Do not keep track of profile in event
                         eventToSend.setProfileId(null);
                     }
 
-                    eventToSend.getAttributes().put(Event.HTTP_REQUEST_ATTRIBUTE, request);
-                    eventToSend.getAttributes().put(Event.HTTP_RESPONSE_ATTRIBUTE, response);
-                    logger.debug("Received event " + event.getEventType() + " for profile=" + profile.getItemId() + " session=" + (
-                            session != null ? session.getItemId() : null) + " target=" + event.getTarget() + " timestamp=" + timestamp);
-                    changes |= eventService.send(eventToSend);
+                    eventToSend.getAttributes().put(Event.HTTP_REQUEST_ATTRIBUTE, eventsRequestContext.getRequest());
+                    eventToSend.getAttributes().put(Event.HTTP_RESPONSE_ATTRIBUTE, eventsRequestContext.getResponse());
+                    logger.debug("Received event " + event.getEventType() + " for profile=" + eventsRequestContext.getProfile().getItemId() + " session=" + (
+                            eventsRequestContext.getSession() != null ? eventsRequestContext.getSession().getItemId() : null) +
+                            " target=" + event.getTarget() + " timestamp=" + eventsRequestContext.getTimestamp());
+                    eventsRequestContext.addChanges(eventService.send(eventToSend));
                     // If the event execution changes the profile we need to update it so the next event use the right profile
-                    if ((changes & EventService.PROFILE_UPDATED) == EventService.PROFILE_UPDATED) {
-                        profile = eventToSend.getProfile();
+                    if ((eventsRequestContext.getChanges() & EventService.PROFILE_UPDATED) == EventService.PROFILE_UPDATED) {
+                        eventsRequestContext.setProfile(eventToSend.getProfile());
                     }
-                    if ((changes & EventService.ERROR) == EventService.ERROR) {
+                    if ((eventsRequestContext.getChanges() & EventService.ERROR) == EventService.ERROR) {
                         //Don't count the event that failed
-                        processedEventsCnt--;
-                        logger.error("Error processing events. Total number of processed events: {}/{}", processedEventsCnt, events.size());
+                        eventsRequestContext.setProcessedItems(eventsRequestContext.getProcessedItems() - 1);
+                        logger.error("Error processing events. Total number of processed events: {}/{}", eventsRequestContext.getProcessedItems(), eventsRequestContext.getTotalItems());
                         break;
                     }
                 }
             }
         }
-        return new Changes(changes, processedEventsCnt, profile);
+
+        return eventsRequestContext;
+    }
+
+    @Override
+    public void finalizeEventsRequest(EventsRequestContext eventsRequestContext, boolean crashOnError) {
+        // in case of changes on profile, persist the profile
+        if ((eventsRequestContext.getChanges() & EventService.PROFILE_UPDATED) == EventService.PROFILE_UPDATED) {
+            profileService.save(eventsRequestContext.getProfile());
+        }
+
+        // in case of changes on session, persist the session
+        if ((eventsRequestContext.getChanges() & EventService.SESSION_UPDATED) == EventService.SESSION_UPDATED && eventsRequestContext.getSession() != null) {
+            profileService.saveSession(eventsRequestContext.getSession());
+        }
+
+        // In case of error, return an error message
+        if ((eventsRequestContext.getChanges() & EventService.ERROR) == EventService.ERROR) {
+            if (crashOnError) {
+                String errorMessage = "Error processing events. Total number of processed events: " + eventsRequestContext.getProcessedItems() + "/"
+                        + eventsRequestContext.getTotalItems();
+                throw new BadRequestException(errorMessage);
+            } else {
+                eventsRequestContext.getResponse().setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
+            }
+        }
+
+        // Set profile cookie
+        if (!(eventsRequestContext.getProfile() instanceof Persona)) {
+            eventsRequestContext.getResponse().setHeader("Set-Cookie",
+                    HttpUtils.getProfileCookieString(eventsRequestContext.getProfile(), configSharingService, eventsRequestContext.getRequest().isSecure()));
+        }
+    }
+
+    private Profile createNewProfile(String existingProfileId, Date timestamp) {
+        Profile profile;
+        String profileId = existingProfileId;
+        if (profileId == null) {
+            profileId = UUID.randomUUID().toString();
+        }
+        profile = new Profile(profileId);
+        profile.setProperty("firstVisit", timestamp);
+        return profile;
     }
 }
diff --git a/rest/src/main/java/org/apache/unomi/utils/Changes.java b/rest/src/main/java/org/apache/unomi/utils/Changes.java
deleted file mode 100644
index b3334307d..000000000
--- a/rest/src/main/java/org/apache/unomi/utils/Changes.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.unomi.utils;
-
-import org.apache.unomi.api.Profile;
-
-/**
- * This class is a simple object to get the updated profile without the need of reloading it
- *
- * @author dgaillard
- */
-public class Changes {
-    private int changeType;
-    private int processedItems;
-    private Profile profile;
-
-    public Changes(int changeType, Profile profile) {
-        this(changeType,0,profile);
-    }
-
-    public Changes(int changeType, int processedItems, Profile profile) {
-        this.changeType = changeType;
-        this.processedItems = processedItems;
-        this.profile = profile;
-    }
-
-    public int getChangeType() {
-        return changeType;
-    }
-
-    public void setChangeType(int changeType) {
-        this.changeType = changeType;
-    }
-
-    public int getProcessedItems() {
-        return processedItems;
-    }
-
-    public Profile getProfile() {
-        return profile;
-    }
-}
diff --git a/rest/src/main/java/org/apache/unomi/utils/EventsRequestContext.java b/rest/src/main/java/org/apache/unomi/utils/EventsRequestContext.java
new file mode 100644
index 000000000..188f42da2
--- /dev/null
+++ b/rest/src/main/java/org/apache/unomi/utils/EventsRequestContext.java
@@ -0,0 +1,121 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.unomi.utils;
+
+import org.apache.unomi.api.Profile;
+import org.apache.unomi.api.Session;
+import org.apache.unomi.api.services.EventService;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.util.Date;
+
+/**
+ * This is a bean that maintain the current situation during a request that contains events to be processed.
+ * It's in charge to hold an up to date Session + Profile for the current request, but also the status of the events executions:
+ * - changes
+ * - number of events processed
+ */
+public class EventsRequestContext {
+
+    private Date timestamp;
+    private Profile profile;
+    private Session session;
+    private HttpServletRequest request;
+    private HttpServletResponse response;
+    private int changes;
+    private int totalItems;
+    private int processedItems;
+
+    private EventsRequestContext() {
+    }
+
+    public EventsRequestContext(Date timestamp, Profile profile, Session session, HttpServletRequest request, HttpServletResponse response) {
+        this.timestamp = timestamp;
+        this.profile = profile;
+        this.session = session;
+        this.request = request;
+        this.response = response;
+        this.changes = EventService.NO_CHANGE;
+        this.totalItems = 0;
+        this.processedItems = 0;
+    }
+
+    public Date getTimestamp() {
+        return timestamp;
+    }
+
+    public void setTimestamp(Date timestamp) {
+        this.timestamp = timestamp;
+    }
+
+    public Profile getProfile() {
+        return profile;
+    }
+
+    public void setProfile(Profile profile) {
+        this.profile = profile;
+    }
+
+    public Session getSession() {
+        return session;
+    }
+
+    public void setSession(Session session) {
+        this.session = session;
+    }
+
+    public int getChanges() {
+        return changes;
+    }
+
+    public void addChanges(int changes) {
+        this.changes |= changes;
+    }
+
+    public int getTotalItems() {
+        return totalItems;
+    }
+
+    public void setTotalItems(int totalItems) {
+        this.totalItems = totalItems;
+    }
+
+    public int getProcessedItems() {
+        return processedItems;
+    }
+
+    public void setProcessedItems(int processedItems) {
+        this.processedItems = processedItems;
+    }
+
+    public HttpServletRequest getRequest() {
+        return request;
+    }
+
+    public void setRequest(HttpServletRequest request) {
+        this.request = request;
+    }
+
+    public HttpServletResponse getResponse() {
+        return response;
+    }
+
+    public void setResponse(HttpServletResponse response) {
+        this.response = response;
+    }
+}