adds Close method for local client to gracefully shutdown Config and …

…Event Managers

src/main/java/com/devcycle/sdk/server/local/api/DVCLocalClient.java

@@ -21,6 +21,8 @@ public final class DVCLocalClient {
 
   private EventQueueManager eventQueueManager;
 
+  private Boolean isInitialized = false;
+
   public DVCLocalClient(String serverKey) {
     this(serverKey, DVCLocalOptions.builder().build());
   }
@@ -35,6 +37,7 @@ public DVCLocalClient(String serverKey, DVCLocalOptions dvcOptions) {
     } catch (Exception e) {
       System.out.printf("Error creating event queue due to error: %s%n", e.getMessage());
     }
+    isInitialized = true;
   }
 
   /**
@@ -143,6 +146,18 @@ public void track(User user, Event event) {
     }
   }
 
+  /**
+   * Gracefully close the client
+   * 
+   */
+  public void close() {
+    if (!isInitialized) {
+      return;
+    }
+    configManager.cleanup();
+    eventQueueManager.cleanup();
+  }
+
   private void validateUser(User user) {
     if (user == null) {
       throw new IllegalArgumentException("User cannot be null");

src/main/java/com/devcycle/sdk/server/local/managers/EnvironmentConfigManager.java

@@ -130,4 +130,8 @@ private ProjectConfig getConfigResponse(Call<ProjectConfig> call) throws DVCExce
       throw new DVCException(httpResponseCode, errorResponse);
     }
   }
+
+  public void cleanup() {
+    scheduler.shutdown();
+  }
 }

src/main/java/com/devcycle/sdk/server/local/managers/EventQueueManager.java

@@ -171,4 +171,13 @@ private boolean checkEventQueueSize() throws Exception {
         }
         return false;
     }
+
+    public void cleanup() {
+        try {
+            flushEvents();
+        } catch (Exception e) {
+            System.out.printf("DVC Cleanup error: %s%n", e.getMessage());
+        }
+        scheduler.shutdown();
+    }
 }