Skip policy preload if DB already contains data

Issue-ID: POLICY-2517
Change-Id: I430eaed1dbc2f81aa2d15af0ced3e879349a8bea
Signed-off-by: Jim Hahn <jrh3@att.com>

2 files changed, 98 insertions, 1 deletions

diff --git a/main/src/main/java/org/onap/policy/api/main/startstop/ApiDatabaseInitializer.java b/main/src/main/java/org/onap/policy/api/main/startstop/ApiDatabaseInitializer.java
index 199b6bd6..cbd89cb8 100644
--- a/main/src/main/java/org/onap/policy/api/main/startstop/ApiDatabaseInitializer.java
+++ b/main/src/main/java/org/onap/policy/api/main/startstop/ApiDatabaseInitializer.java
@@ -2,7 +2,7 @@
  * ============LICENSE_START=======================================================
  * ONAP Policy API
  * ================================================================================
- * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2019-2020 AT&T Intellectual Property. All rights reserved.
  * Modifications Copyright (C) 2019-2020 Nordix Foundation.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -32,10 +32,12 @@ import org.onap.policy.common.utils.coder.CoderException;
 import org.onap.policy.common.utils.coder.StandardYamlCoder;
 import org.onap.policy.common.utils.resources.ResourceUtils;
 import org.onap.policy.models.base.PfModelException;
+import org.onap.policy.models.base.PfModelRuntimeException;
 import org.onap.policy.models.provider.PolicyModelsProvider;
 import org.onap.policy.models.provider.PolicyModelsProviderFactory;
 import org.onap.policy.models.tosca.authorative.concepts.ToscaDataType;
 import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyType;
+import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyTypeFilter;
 import org.onap.policy.models.tosca.authorative.concepts.ToscaServiceTemplate;
 import org.onap.policy.models.tosca.authorative.concepts.ToscaTopologyTemplate;
 import org.slf4j.Logger;
@@ -70,6 +72,12 @@ public class ApiDatabaseInitializer {
 
         try (PolicyModelsProvider databaseProvider =
                 factory.createPolicyModelsProvider(apiParameterGroup.getDatabaseProviderParameters())) {
+
+            if (alreadyExists(databaseProvider)) {
+                LOGGER.warn("DB already contains policy data - skipping preload");
+                return;
+            }
+
             ToscaServiceTemplate serviceTemplate = new ToscaServiceTemplate();
             serviceTemplate.setDataTypes(new LinkedHashMap<String, ToscaDataType>());
             serviceTemplate.setPolicyTypes(new LinkedHashMap<String, ToscaPolicyType>());
@@ -84,6 +92,21 @@ public class ApiDatabaseInitializer {
         }
     }
 
+    private boolean alreadyExists(PolicyModelsProvider databaseProvider) throws PfModelException {
+        try {
+            ToscaServiceTemplate serviceTemplate =
+                            databaseProvider.getFilteredPolicyTypes(ToscaPolicyTypeFilter.builder().build());
+            if (!serviceTemplate.getPolicyTypes().isEmpty()) {
+                return true;
+            }
+
+        } catch (PfModelRuntimeException e) {
+            LOGGER.trace("DB does not yet contain policy types", e);
+        }
+
+        return false;
+    }
+
     private ToscaServiceTemplate preloadServiceTemplate(ToscaServiceTemplate serviceTemplate,
             List<String> entities, FunctionWithEx<ToscaServiceTemplate, ToscaServiceTemplate> getter)
                     throws PolicyApiException, CoderException, PfModelException {
diff --git a/main/src/test/java/org/onap/policy/api/main/startstop/ApiDatabaseInitializerTest.java b/main/src/test/java/org/onap/policy/api/main/startstop/ApiDatabaseInitializerTest.java
new file mode 100644
index 00000000..cfc2a30e
--- /dev/null
+++ b/main/src/test/java/org/onap/policy/api/main/startstop/ApiDatabaseInitializerTest.java
@@ -0,0 +1,74 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.api.main.startstop;
+
+import static org.assertj.core.api.Assertions.assertThatCode;
+import static org.junit.Assert.fail;
+
+import java.io.File;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.onap.policy.api.main.exception.PolicyApiException;
+import org.onap.policy.api.main.parameters.ApiParameterGroup;
+import org.onap.policy.api.main.parameters.CommonTestData;
+import org.onap.policy.common.parameters.GroupValidationResult;
+import org.onap.policy.common.utils.coder.StandardCoder;
+import org.onap.policy.models.provider.PolicyModelsProvider;
+import org.onap.policy.models.provider.PolicyModelsProviderFactory;
+
+public class ApiDatabaseInitializerTest {
+    private static final String PARAM_FILE = "src/test/resources/parameters/ApiConfigParameters_Https.json";
+    private static final CommonTestData COMMON_TEST_DATA = new CommonTestData();
+    private static ApiParameterGroup params;
+    private static PolicyModelsProvider provider;
+
+    /**
+     * Creates the DB and keeps it open.
+     */
+    @BeforeClass
+    public static void setUpBeforeClass() throws Exception {
+        COMMON_TEST_DATA.makeParameters(PARAM_FILE, "src/test/resources/parameters/ApiConfigParametersXXX.json", 6969);
+
+        params = new StandardCoder().decode(new File(PARAM_FILE), ApiParameterGroup.class);
+        GroupValidationResult result = params.validate();
+        if (!result.isValid()) {
+            fail(result.getResult());
+        }
+
+        // keep the DB open until the test completes
+        provider = new PolicyModelsProviderFactory().createPolicyModelsProvider(params.getDatabaseProviderParameters());
+    }
+
+    @AfterClass
+    public static void tearDownAfterClass() throws Exception {
+        provider.close();
+    }
+
+    @Test
+    public void testInitializeApiDatabase() throws PolicyApiException {
+        ApiDatabaseInitializer adi = new ApiDatabaseInitializer();
+        assertThatCode(() -> adi.initializeApiDatabase(params)).doesNotThrowAnyException();
+
+        // invoke it again - should still be OK
+        assertThatCode(() -> adi.initializeApiDatabase(params)).doesNotThrowAnyException();
+    }
+}