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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.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.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) {
// TODO: load latest data from datavase
}
public synchronized void update(Position position) {
long device = position.getDeviceId();
positions.put(device, position);
if (listeners.containsKey(device)) {
for (DataCacheListener listener : listeners.get(device)) {
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 device : devices) {
addListener(device, listener);
}
}
public synchronized void addListener(long device, DataCacheListener listener) {
if (!listeners.containsKey(device)) {
listeners.put(device, new HashSet<DataCacheListener>());
}
listeners.get(device).add(listener);
}
public void removeListener(Collection<Long> devices, DataCacheListener listener) {
for (long device : devices) {
removeListener(device, listener);
}
}
public synchronized void removeListener(long device, DataCacheListener listener) {
if (!listeners.containsKey(device)) {
listeners.put(device, new HashSet<DataCacheListener>());
}
listeners.get(device).remove(listener);
}
}
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