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authorAnton Tananaev <anton.tananaev@gmail.com>2019-03-31 22:35:39 -0700
committerAnton Tananaev <anton.tananaev@gmail.com>2019-03-31 22:35:39 -0700
commit59416923dcb3a756eaf532cc4259f2f6625c0762 (patch)
tree9082dae6616deac8fda432b7bfd80e4a52b6d9dc /src/main/java/org/traccar/database/BaseObjectManager.java
parent79a129dd6327d932133d6b9a50190d3f4927bff9 (diff)
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Convert project to gradle
Diffstat (limited to 'src/main/java/org/traccar/database/BaseObjectManager.java')
-rw-r--r--src/main/java/org/traccar/database/BaseObjectManager.java127
1 files changed, 127 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/database/BaseObjectManager.java b/src/main/java/org/traccar/database/BaseObjectManager.java
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+/*
+ * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * 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.
+ */
+package org.traccar.database;
+
+import java.sql.SQLException;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.LinkedList;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.traccar.model.BaseModel;
+
+public class BaseObjectManager<T extends BaseModel> {
+
+ private static final Logger LOGGER = LoggerFactory.getLogger(BaseObjectManager.class);
+
+ private final DataManager dataManager;
+
+ private Map<Long, T> items;
+ private Class<T> baseClass;
+
+ protected BaseObjectManager(DataManager dataManager, Class<T> baseClass) {
+ this.dataManager = dataManager;
+ this.baseClass = baseClass;
+ refreshItems();
+ }
+
+ protected final DataManager getDataManager() {
+ return dataManager;
+ }
+
+ protected final Class<T> getBaseClass() {
+ return baseClass;
+ }
+
+ public T getById(long itemId) {
+ return items.get(itemId);
+ }
+
+ public void refreshItems() {
+ if (dataManager != null) {
+ try {
+ Collection<T> databaseItems = dataManager.getObjects(baseClass);
+ if (items == null) {
+ items = new ConcurrentHashMap<>(databaseItems.size());
+ }
+ Set<Long> databaseItemIds = new HashSet<>();
+ for (T item : databaseItems) {
+ databaseItemIds.add(item.getId());
+ if (items.containsKey(item.getId())) {
+ updateCachedItem(item);
+ } else {
+ addNewItem(item);
+ }
+ }
+ for (Long cachedItemId : items.keySet()) {
+ if (!databaseItemIds.contains(cachedItemId)) {
+ removeCachedItem(cachedItemId);
+ }
+ }
+ } catch (SQLException error) {
+ LOGGER.warn("Error refreshing items", error);
+ }
+ }
+ }
+
+ protected void addNewItem(T item) {
+ items.put(item.getId(), item);
+ }
+
+ public void addItem(T item) throws SQLException {
+ dataManager.addObject(item);
+ addNewItem(item);
+ }
+
+ protected void updateCachedItem(T item) {
+ items.put(item.getId(), item);
+ }
+
+ public void updateItem(T item) throws SQLException {
+ dataManager.updateObject(item);
+ updateCachedItem(item);
+ }
+
+ protected void removeCachedItem(long itemId) {
+ items.remove(itemId);
+ }
+
+ public void removeItem(long itemId) throws SQLException {
+ BaseModel item = getById(itemId);
+ if (item != null) {
+ dataManager.removeObject(baseClass, itemId);
+ removeCachedItem(itemId);
+ }
+ }
+
+ public final Collection<T> getItems(Set<Long> itemIds) {
+ Collection<T> result = new LinkedList<>();
+ for (long itemId : itemIds) {
+ result.add(getById(itemId));
+ }
+ return result;
+ }
+
+ public Set<Long> getAllItems() {
+ return items.keySet();
+ }
+
+}