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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();
}
}
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