CPS-887 Decreasing performance of cmHandle registration

[cps.git] / cps-ri / src / main / java / org / onap / cps / spi / repository / ModuleReferenceRepositoryImpl.java

diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/ModuleReferenceRepositoryImpl.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/ModuleReferenceRepositoryImpl.java
new file mode 100644 (file)
index 0000000..f4078ff
--- /dev/null
+++ b/cps-ri/src/main/java/org/onap/cps/spi/repository/ModuleReferenceRepositoryImpl.java
@@ -0,0 +1,107 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.spi.repository;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.UUID;
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import lombok.SneakyThrows;
+import lombok.extern.slf4j.Slf4j;
+import org.onap.cps.spi.model.ModuleReference;
+import org.springframework.transaction.annotation.Transactional;
+
+@Slf4j
+@Transactional
+public class ModuleReferenceRepositoryImpl implements ModuleReferenceQuery {
+
+    @PersistenceContext
+    private EntityManager entityManager;
+
+    @Override
+    @SneakyThrows
+    public Collection<ModuleReference> identifyNewModuleReferences(
+        final Collection<ModuleReference> moduleReferencesToCheck) {
+
+        if (moduleReferencesToCheck == null || moduleReferencesToCheck.isEmpty()) {
+            return Collections.EMPTY_LIST;
+        }
+
+        final String tempTableName = "moduleReferencesToCheckTemp"
+            + UUID.randomUUID().toString().replaceAll("-", "");
+
+        createTemporaryTable(tempTableName);
+        insertDataIntoTable(tempTableName, moduleReferencesToCheck);
+
+        return identifyNewModuleReferencesForCmHandle(tempTableName);
+    }
+
+    private void createTemporaryTable(final String tempTableName) {
+        final StringBuilder sqlStringBuilder = new StringBuilder("CREATE TEMPORARY TABLE " + tempTableName + "(");
+        sqlStringBuilder.append(" id INT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,");
+        sqlStringBuilder.append(" module_name varchar NOT NULL,");
+        sqlStringBuilder.append(" revision varchar NOT NULL");
+        sqlStringBuilder.append(");");
+
+        entityManager.createNativeQuery(sqlStringBuilder.toString()).executeUpdate();
+    }
+
+    private void insertDataIntoTable(final String tempTableName, final Collection<ModuleReference> moduleReferences) {
+        final StringBuilder sqlStringBuilder = new StringBuilder("INSERT INTO  " + tempTableName);
+        sqlStringBuilder.append(" (module_name, revision) ");
+        sqlStringBuilder.append(" VALUES ");
+
+        for (final ModuleReference moduleReference : moduleReferences) {
+            sqlStringBuilder.append("('");
+            sqlStringBuilder.append(moduleReference.getModuleName());
+            sqlStringBuilder.append("', '");
+            sqlStringBuilder.append(moduleReference.getRevision());
+            sqlStringBuilder.append("'),");
+        }
+
+        // replace last ',' with ';'
+        sqlStringBuilder.replace(sqlStringBuilder.length() - 1, sqlStringBuilder.length(), ";");
+
+        entityManager.createNativeQuery(sqlStringBuilder.toString()).executeUpdate();
+    }
+
+    private Collection<ModuleReference> identifyNewModuleReferencesForCmHandle(final String tempTableName) {
+        final String sql = String.format(
+            "SELECT %1$s.module_name, %1$s.revision"
+                + " FROM %1$s LEFT JOIN yang_resource"
+                + " ON yang_resource.module_name=%1$s.module_name"
+                + " AND yang_resource.revision=%1$s.revision"
+                + " WHERE yang_resource.module_name IS NULL;", tempTableName);
+
+        final List<Object[]> resultsAsObjects =
+            entityManager.createNativeQuery(sql).getResultList();
+
+        final List<ModuleReference> resultsAsModuleReferences = new ArrayList<>(resultsAsObjects.size());
+        for (final Object[] row : resultsAsObjects) {
+            resultsAsModuleReferences.add(new ModuleReference((String) row[0], (String) row[1]));
+        }
+
+        return resultsAsModuleReferences;
+    }
+}