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diff --git a/src/main/java/org/onap/dcae/inventory/daos/InventoryDAOManager.java b/src/main/java/org/onap/dcae/inventory/daos/InventoryDAOManager.java
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+/*-
+ * ============LICENSE_START=======================================================
+ * dcae-inventory
+ * ================================================================================
+ * Copyright (C) 2017 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.dcae.inventory.daos;
+
+import org.onap.dcae.inventory.InventoryConfiguration;
+import org.onap.dcae.inventory.dbthings.StringListArgument;
+import io.dropwizard.jdbi.DBIFactory;
+import io.dropwizard.setup.Environment;
+import org.skife.jdbi.v2.DBI;
+import org.skife.jdbi.v2.Handle;
+import org.skife.jdbi.v2.util.BooleanMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Reluctantly made this into a singleton in order to have access to the DAOs in the request handling code. Didn't
+ * want to change the interface on the handlers because they are generated by Swagger and I wanted to flexibility
+ * to swap in changes easily. This meant sacrificing dependency injection which is preferred.
+ *
+ * Created by mhwang on 4/19/16.
+ */
+public final class InventoryDAOManager {
+
+ private static InventoryDAOManager instance;
+
+ public static InventoryDAOManager getInstance() {
+ if (instance == null) {
+ instance = new InventoryDAOManager();
+ }
+
+ return instance;
+ }
+
+ public static class InventoryDAOManagerSetupException extends RuntimeException {
+
+ public InventoryDAOManagerSetupException(String message) {
+ super(message);
+ }
+
+ }
+
+ private final static Logger LOG = LoggerFactory.getLogger(InventoryDAOManager.class);
+ // WATCH! Table creation order matters where mapping tables refer to other tables for foreign keys.
+ private final static List<Class> DAO_CLASSES = Arrays.asList(DCAEServiceTypesDAO.class, DCAEServicesDAO.class,
+ DCAEServiceComponentsDAO.class, DCAEServicesComponentsMapsDAO.class);
+
+ private DBI jdbi;
+ private Environment environment;
+ private InventoryConfiguration configuration;
+
+ private InventoryDAOManager() {
+ }
+
+ /**
+ * Setup the manager
+ *
+ * Saving the Dropwizard environment and configuration which are used to construct the DBI object in a later
+ * initialize call. This method can only be called once to be safe and to avoid runtime problems that could be
+ * caused if the global instance of this class gets into a weird state (Couldn't use Java's `final` qualifier).
+ *
+ * @param environment
+ * @param inventoryConfiguration
+ */
+ public void setup(Environment environment, InventoryConfiguration inventoryConfiguration) {
+ if (this.environment == null && this.configuration == null) {
+ this.environment = environment;
+ this.configuration = inventoryConfiguration;
+ } else {
+ throw new InventoryDAOManagerSetupException("InventoryDAOManager setup can only be called once.");
+ }
+ }
+
+ /**
+ * Initialize the manager
+ *
+ * Create the underlying validated DBI object that is used to manage database connections
+ */
+ public void initialize() {
+ final DBIFactory factory = new DBIFactory();
+ final DBI jdbi = factory.build(this.environment, this.configuration.getDataSourceFactory(), "dcae-database");
+ jdbi.registerArgumentFactory(new StringListArgument());
+
+ for (Class<? extends InventoryDAO> daoClass : DAO_CLASSES) {
+ final InventoryDAO dao = jdbi.onDemand(daoClass);
+
+ if (dao.checkIfTableExists()) {
+ LOG.info(String.format("Sql table exists: %s", daoClass.getSimpleName()));
+ } else {
+ dao.createTable();
+ LOG.info(String.format("Sql table created: %s", daoClass.getSimpleName()));
+ }
+ }
+
+ // CREATE VIEWS
+ // TODO: This doesn't belong here and is not consistent with the above approach. Make it better.
+ try (Handle jdbiHandle = jdbi.open()) {
+ String viewName = "dcae_service_types_latest";
+ String checkQuery = String.format("select exists (select * from information_schema.tables where table_name = '%s')",
+ viewName);
+
+ if (jdbiHandle.createQuery(checkQuery).map(BooleanMapper.FIRST).first()) {
+ LOG.info(String.format("Sql view exists: %s", viewName));
+ } else {
+ StringBuilder sb = new StringBuilder(String.format("create view %s as ", viewName));
+ sb.append("select s.* from dcae_service_types s ");
+ sb.append("join (select type_name, max(type_version) as max_version from dcae_service_types group by type_name) as f ");
+ sb.append("on s.type_name = f.type_name and s.type_version = f.max_version");
+
+ jdbiHandle.execute(sb.toString());
+ LOG.info(String.format("Sql view created: %s", viewName));
+ }
+ } catch (Exception e) {
+ throw new RuntimeException("", e);
+ }
+
+ // Do this assignment at the end after performing table checks to ensure that connection is good
+ this.jdbi = jdbi;
+ }
+
+ private InventoryDAO getDAO(Class<? extends InventoryDAO> klass) {
+ if (jdbi == null) {
+ throw new RuntimeException("InventoryDAOManager has not been initialized!");
+ }
+
+ // Using this approach to constructing the DAO, the client is not responsible for closing the handle.
+ // http://jdbi.org/sql_object_overview/
+ // > In this case we do not need to (and in fact shouldn’t) ever take action to close the handle the sql object uses.
+ return jdbi.onDemand(klass);
+ }
+
+ public DCAEServicesDAO getDCAEServicesDAO() {
+ return (DCAEServicesDAO) this.getDAO(DCAEServicesDAO.class);
+ }
+
+ public DCAEServiceComponentsDAO getDCAEServiceComponentsDAO() {
+ return (DCAEServiceComponentsDAO) this.getDAO(DCAEServiceComponentsDAO.class);
+ }
+
+ public DCAEServicesComponentsMapsDAO getDCAEServicesComponentsDAO() {
+ return (DCAEServicesComponentsMapsDAO) this.getDAO(DCAEServicesComponentsMapsDAO.class);
+ }
+
+ public DCAEServiceTransactionDAO getDCAEServiceTransactionDAO() {
+ return jdbi.onDemand(DCAEServiceTransactionDAO.class);
+ }
+
+ public DCAEServiceTypesDAO getDCAEServiceTypesDAO() {
+ return (DCAEServiceTypesDAO) this.getDAO(DCAEServiceTypesDAO.class);
+ }
+
+ /**
+ * Must close the handle that is returned here. It is AutoCloseable so just use it as a try-with-resource.
+ *
+ * @return
+ */
+ public Handle getHandle() {
+ return this.jdbi.open();
+ }
+
+}