Add auto queue time feature #51

src/main/java/com/brsanthu/googleanalytics/GoogleAnalyticsConfig.java

@@ -53,6 +53,7 @@ public class GoogleAnalyticsConfig {
     private boolean gatherStats = false;
     private RequestParameterDiscoverer requestParameterDiscoverer = new DefaultRequestParameterDiscoverer();
     private GoogleAnalyticsExceptionHandler exceptionHandler;
+    private boolean autoQueueTimeEnabled = true;
 
     public RequestParameterDiscoverer getRequestParameterDiscoverer() {
         return requestParameterDiscoverer;
@@ -418,4 +419,19 @@ public GoogleAnalyticsConfig setExceptionHandler(GoogleAnalyticsExceptionHandler
         return this;
     }
 
+    public boolean isAutoQueueTimeEnabled() {
+        return autoQueueTimeEnabled;
+    }
+
+    /**
+     * If enabled, library will calculate the queue time (qt) at the time request is being posted to GA based on when
+     * hit request was created and when it is posted to GA. Defaults to <code>true</code>.
+     *
+     * @since 2.1
+     */
+    public GoogleAnalyticsConfig setAutoQueueTimeEnabled(boolean autoQueueTimeEnabled) {
+        this.autoQueueTimeEnabled = autoQueueTimeEnabled;
+        return this;
+    }
+
 }

src/main/java/com/brsanthu/googleanalytics/httpclient/HttpRequest.java

@@ -3,14 +3,17 @@
 import java.util.HashMap;
 import java.util.Map;
 
+import com.brsanthu.googleanalytics.request.GoogleAnalyticsRequest;
+
 public class HttpRequest {
     private String contentType;
     private String method;
     private String url;
     private Map<String, String> bodyParams = new HashMap<>();
+    private GoogleAnalyticsRequest<?> googleAnalyticsRequest;
 
     public HttpRequest(String url) {
-        this.setUrl(url);
+        setUrl(url);
     }
 
     public HttpRequest post() {
@@ -53,4 +56,13 @@ public HttpRequest setUrl(String url) {
         this.url = url;
         return this;
     }
+
+    public GoogleAnalyticsRequest<?> getGoogleAnalyticsRequest() {
+        return googleAnalyticsRequest;
+    }
+
+    public HttpRequest setGoogleAnalyticsRequest(GoogleAnalyticsRequest<?> googleAnalyticsRequest) {
+        this.googleAnalyticsRequest = googleAnalyticsRequest;
+        return this;
+    }
 }

src/main/java/com/brsanthu/googleanalytics/internal/GoogleAnalyticsImpl.java

@@ -11,7 +11,10 @@
 package com.brsanthu.googleanalytics.internal;
 
 import static com.brsanthu.googleanalytics.internal.GaUtils.isEmpty;
+import static com.brsanthu.googleanalytics.request.GoogleAnalyticsParameter.QUEUE_TIME;
 
+import java.time.ZonedDateTime;
+import java.time.temporal.ChronoUnit;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -94,6 +97,8 @@ public Future<GoogleAnalyticsResponse> postAsync(GoogleAnalyticsRequest<?> reque
     @Override
     public GoogleAnalyticsResponse post(GoogleAnalyticsRequest<?> gaReq) {
         GoogleAnalyticsResponse response = new GoogleAnalyticsResponse();
+        response.setGoogleAnalyticsRequest(gaReq);
+
         if (!config.isEnabled()) {
             return response;
         }
@@ -118,6 +123,8 @@ public GoogleAnalyticsResponse post(GoogleAnalyticsRequest<?> gaReq) {
 
     protected GoogleAnalyticsResponse postBatch(GoogleAnalyticsRequest<?> gaReq) {
         GoogleAnalyticsResponse resp = new GoogleAnalyticsResponse();
+        resp.setGoogleAnalyticsRequest(gaReq);
+
         HttpRequest httpReq = createHttpRequest(gaReq);
         resp.setRequestParams(httpReq.getBodyParams());
 
@@ -151,6 +158,8 @@ private void submitBatch(boolean force) {
                 // others will not post it even if multiple threads were to wait at sync block at same time
                 // https://en.wikipedia.org/wiki/Double-checked_locking
                 if (isSubmitBatch(force)) {
+                    processAutoQueueTime(currentBatch);
+
                     logger.debug("Submitting a batch of " + currentBatch.size() + " requests to GA");
                     httpClient.postBatch(new HttpBatchRequest().setUrl(config.getBatchUrl()).setRequests(currentBatch));
                     currentBatch.clear();
@@ -159,13 +168,52 @@ private void submitBatch(boolean force) {
         }
     }
 
+    protected HttpRequest processAutoQueueTime(HttpRequest request) {
+        if (!config.isAutoQueueTimeEnabled()) {
+            return request;
+        }
+
+        List<HttpRequest> requests = new ArrayList<>();
+        requests.add(request);
+
+        processAutoQueueTime(requests);
+
+        return request;
+    }
+
+    protected void processAutoQueueTime(List<HttpRequest> requests) {
+        if (!config.isAutoQueueTimeEnabled()) {
+            return;
+        }
+
+        // If there is no queue time specified, then set the queue time to time since event occurred to current time
+        // (time at which event being posted). This is helpful for batched requests as request may be sitting in queue
+        // for a while and we need to calculate the time.
+        for (HttpRequest req : requests) {
+            if (req.getGoogleAnalyticsRequest() == null || req.getGoogleAnalyticsRequest().occurredAt() == null) {
+                continue;
+            }
+
+            String qtParamName = QUEUE_TIME.getParameterName();
+
+            Map<String, String> params = req.getBodyParams();
+
+            int millis = (int) ChronoUnit.MILLIS.between(req.getGoogleAnalyticsRequest().occurredAt(), ZonedDateTime.now());
+            int qtMillis = params.containsKey(qtParamName) ? millis + Integer.parseInt(params.get(qtParamName)) : millis;
+
+            params.put(qtParamName, String.valueOf(qtMillis));
+
+            req.getGoogleAnalyticsRequest().queueTime(qtMillis);
+        }
+    }
+
     private boolean isSubmitBatch(boolean force) {
         return force || currentBatch.size() >= config.getBatchSize();
     }
 
     protected GoogleAnalyticsResponse postSingle(GoogleAnalyticsRequest<?> gaReq) {
 
-        HttpRequest httpReq = createHttpRequest(gaReq);
+        HttpRequest httpReq = processAutoQueueTime(createHttpRequest(gaReq));
         HttpResponse httpResp = httpClient.post(httpReq);
 
         GoogleAnalyticsResponse response = new GoogleAnalyticsResponse();
@@ -182,13 +230,12 @@ protected GoogleAnalyticsResponse postSingle(GoogleAnalyticsRequest<?> gaReq) {
     private HttpRequest createHttpRequest(GoogleAnalyticsRequest<?> gaReq) {
         HttpRequest httpReq = new HttpRequest(config.getUrl());
 
-        // Process the parameters
+        httpReq.setGoogleAnalyticsRequest(gaReq);
+
         processParameters(gaReq, httpReq);
 
-        // Process custom dimensions
         processCustomDimensionParameters(gaReq, httpReq);
 
-        // Process custom metrics
         processCustomMetricParameters(gaReq, httpReq);
 
         return httpReq;

src/main/java/com/brsanthu/googleanalytics/request/GoogleAnalyticsRequest.java

@@ -1,15 +1,12 @@
 /*
- * Licensed 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
+ * Licensed 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
+ * 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.
+ * 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 com.brsanthu.googleanalytics.request;
 
@@ -52,6 +49,7 @@
 import static com.brsanthu.googleanalytics.request.GoogleAnalyticsParameter.USER_LANGUAGE;
 import static com.brsanthu.googleanalytics.request.GoogleAnalyticsParameter.VIEWPORT_SIZE;
 
+import java.time.ZonedDateTime;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.Future;
@@ -74,11 +72,11 @@
 @SuppressWarnings("unchecked")
 public class GoogleAnalyticsRequest<T> {
 
-    protected Map<GoogleAnalyticsParameter, String> parms = new HashMap<GoogleAnalyticsParameter, String>();
-    protected Map<String, String> customDimensions = new HashMap<String, String>();
-    protected Map<String, String> customMetrics = new HashMap<String, String>();
-
+    protected Map<GoogleAnalyticsParameter, String> parms = new HashMap<>();
+    protected Map<String, String> customDimensions = new HashMap<>();
+    protected Map<String, String> customMetrics = new HashMap<>();
     protected GoogleAnalyticsExecutor delegateExecutor = null;
+    private ZonedDateTime occurredAt = ZonedDateTime.now();
 
     public GoogleAnalyticsRequest() {
         this(null, null, null, null);
@@ -644,11 +642,11 @@ public String clientId() {
      * </tbody>
      * </table>
      *
-     * 
+     *
      * <div> Example value: <code>as8eknlll</code><br>
      * Example usage: <code>uid=as8eknlll</code> </div>
-     * 
-     * 
+     *
+     *
      * </div>
      *
      * @param value
@@ -1741,7 +1739,7 @@ public String applicationId() {
      * <div class="ind">
      * <p>
      * Optional.
-     * 
+     *
      * </p>
      * <p>
      * This parameter specifies that this visitor has been exposed to an experiment with the given ID. It should be sent
@@ -1765,8 +1763,8 @@ public String applicationId() {
      * </tr>
      * </tbody>
      * </table>
-     * 
-     * 
+     *
+     *
      * <div> Example value: <code>Qp0gahJ3RAO3DJ18b0XoUQ</code><br>
      * Example usage: <code>xid=Qp0gahJ3RAO3DJ18b0XoUQ</code> </div> </div>
      */
@@ -1783,7 +1781,7 @@ public String experimentId() {
      * <div class="ind">
      * <p>
      * Optional.
-     * 
+     *
      * </p>
      * <p>
      * This parameter specifies that this visitor has been exposed to a particular variation of an experiment. It should
@@ -1880,4 +1878,17 @@ public GoogleAnalyticsRequest<T> setExecutor(GoogleAnalyticsExecutor delegateExe
         this.delegateExecutor = delegateExecutor;
         return this;
     }
+
+    /**
+     * Indicates the datetime at which this event occurred. This is used to report the <code>qt</code> parameter, if one
+     * is not set. The <code>occurredAt</code> defaults to datetime when this request was instantiated.
+     */
+    public T occurredAt(ZonedDateTime value) {
+        this.occurredAt = value;
+        return (T) this;
+    }
+
+    public ZonedDateTime occurredAt() {
+        return occurredAt;
+    }
 }

src/main/java/com/brsanthu/googleanalytics/request/GoogleAnalyticsResponse.java

@@ -1,15 +1,12 @@
 /*
- * Licensed 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
+ * Licensed 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
+ * 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.
+ * 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 com.brsanthu.googleanalytics.request;
 
@@ -22,14 +19,15 @@
  */
 public class GoogleAnalyticsResponse {
     private int statusCode = 200;
+    private GoogleAnalyticsRequest<?> googleAnalyticsRequest;
     private Map<String, String> requestParams = null;
 
     public Map<String, String> getRequestParams() {
         return requestParams;
     }
 
     public void setRequestParams(Map<String, String> postedParms) {
-        this.requestParams = postedParms;
+        requestParams = postedParms;
     }
 
     public void setStatusCode(int statusCode) {
@@ -48,4 +46,13 @@ public String toString() {
         builder.append("]");
         return builder.toString();
     }
+
+    public GoogleAnalyticsRequest<?> getGoogleAnalyticsRequest() {
+        return googleAnalyticsRequest;
+    }
+
+    public GoogleAnalyticsResponse setGoogleAnalyticsRequest(GoogleAnalyticsRequest<?> googleAnalyticsRequest) {
+        this.googleAnalyticsRequest = googleAnalyticsRequest;
+        return this;
+    }
 }