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/*
* Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
*
* 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.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.traccar.helper.Log;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class DataCache {
private final Map<Long, Position> positions = new HashMap<Long, Position>();
private final Map<Long, Set<DataCacheListener>> listeners = new HashMap<Long, Set<DataCacheListener>>();
public DataCache(DataManager dataManager) {
try {
Collection<Position> positions = dataManager.getLatestPositions();
for (Position position : positions) {
this.positions.put(position.getDeviceId(), position);
}
} catch (SQLException error) {
Log.warning(error);
}
}
public synchronized void update(Position position) {
long deviceId = position.getDeviceId();
positions.put(deviceId, position);
if (listeners.containsKey(deviceId)) {
for (DataCacheListener listener : listeners.get(deviceId)) {
listener.onUpdate(position);
}
}
}
public synchronized Collection<Position> getInitialState(Collection<Long> devices) {
List<Position> result = new LinkedList<Position>();
for (long device : devices) {
if (positions.containsKey(device)) {
result.add(positions.get(device));
}
}
return result;
}
public static interface DataCacheListener {
public void onUpdate(Position position);
}
public void addListener(Collection<Long> devices, DataCacheListener listener) {
for (long deviceId : devices) {
addListener(deviceId, listener);
}
}
public synchronized void addListener(long deviceId, DataCacheListener listener) {
if (!listeners.containsKey(deviceId)) {
listeners.put(deviceId, new HashSet<DataCacheListener>());
}
listeners.get(deviceId).add(listener);
}
public void removeListener(Collection<Long> devices, DataCacheListener listener) {
for (long deviceId : devices) {
removeListener(deviceId, listener);
}
}
public synchronized void removeListener(long deviceId, DataCacheListener listener) {
if (!listeners.containsKey(deviceId)) {
listeners.put(deviceId, new HashSet<DataCacheListener>());
}
listeners.get(deviceId).remove(listener);
}
}
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