Added exposure of the data manager id through the context. (#213)

simulation/src/main/java/gov/hhs/aspr/ms/gcm/nucleus/DataManagerContext.java

@@ -253,4 +253,12 @@ public List<DataManagerPlan> retrievePlans() {
 		return simulation.retrievePlansForDataManager(dataManagerId);
 	}
 
+	/**
+	 * Returns the DataManagerId of the data manager assigned to this instance of
+	 * the data manager context.
+	 */
+	public DataManagerId getDataManagerId() {
+		return dataManagerId;
+	}
+
 }

simulation/src/test/java/gov/hhs/aspr/ms/gcm/nucleus/AT_DataManagerContext.java

@@ -1073,4 +1073,44 @@ private void planRetrievalSimCloseSubscribe(DataManagerContext context, List<Dat
 		assertEquals(expectedPlans.size(), plans.size());
 		assertEquals(expectedPlans, plans);
 	}
+
+	@Test
+	@UnitTestMethod(target = DataManagerContext.class, name = "getDataManagerId", args = {})
+	public void testGetDataManagerId() {
+
+		TestPluginData.Builder pluginDataBuilder = TestPluginData.builder();
+
+		pluginDataBuilder.addTestDataManager("dm1", () -> new TestDataManager1());
+		pluginDataBuilder.addTestDataManager("dm2", () -> new TestDataManager2());
+		pluginDataBuilder.addTestDataManager("dm3", () -> new TestDataManager3());
+
+		/*
+		 * The TestPlugin already contains a data manager that will be added to the
+		 * simulation ahead of the ones above, so the numbering will start with 1.
+		 */
+
+		pluginDataBuilder.addTestDataManagerPlan("dm1", new TestDataManagerPlan(0, (context) -> {
+			assertEquals(new DataManagerId(1), context.getDataManagerId());
+		}));
+
+		pluginDataBuilder.addTestDataManagerPlan("dm2", new TestDataManagerPlan(0, (context) -> {
+			assertEquals(new DataManagerId(2), context.getDataManagerId());
+		}));
+
+		pluginDataBuilder.addTestDataManagerPlan("dm3", new TestDataManagerPlan(0, (context) -> {
+			assertEquals(new DataManagerId(3), context.getDataManagerId());
+		}));
+
+		// build the plugin
+		TestPluginData testPluginData = pluginDataBuilder.build();
+		Plugin testPlugin = TestPlugin.getTestPlugin(testPluginData);
+
+		TestOutputConsumer testOutputConsumer = new TestOutputConsumer();
+		// run the simulation
+		Simulation.builder()//
+				.addPlugin(testPlugin)//
+				.setOutputConsumer(testOutputConsumer).build()//
+				.execute();//
+
+	}
 }