Updates for Timepoint assocation (LT-60) and Conformance Checks (LT-92, LT-93, LT-94)

Packages/worklist/lib/getStudyMetadata.js

@@ -0,0 +1,45 @@
+// Define the StudyMetaData object. This is used as a cache
+// to store study meta data information to prevent unnecessary
+// calls to the server
+var StudyMetaData = {};
+
+/**
+ * Retrieves study metadata using a server call, and fires a callback
+ * when completed.
+ *
+ * @params {string} studyInstanceUid The UID of the Study to be retrieved
+ * @params {function} doneCallback The callback function to be executed when the study retrieval has finished
+ * @param failCallback The callback function to be executed when the study retrieval has failed
+ */
+getStudyMetadata = function(studyInstanceUid, doneCallback, failCallback) {
+    log.info('worklistStudy getStudyMetadata');
+
+    // If the StudyMetaData cache already has data related to this
+    // studyInstanceUid, then we should fire the doneCallback with this data
+    // and stop here.
+    var study = StudyMetaData[studyInstanceUid];
+    if (study) {
+        doneCallback(study);
+        return;
+    }
+
+    // If no study metadata is in the cache variable, we need to retrieve it from
+    // the server with a call.
+    Meteor.call('GetStudyMetadata', studyInstanceUid, function(error, study) {
+        if (error) {
+            log.warn(error);
+            failCallback(error);
+            return;
+        }
+
+        // Once we have retrieved the data, we sort the series' by series
+        // and instance number in ascending order
+        sortStudy(study);
+
+        // Then we store this data in the cache variable
+        StudyMetaData[studyInstanceUid] = study;
+
+        // Finally, we fire the doneCallback with this study meta data
+        doneCallback(study);
+    });
+};