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/*
* Copyright 2023 Anton Tananaev (anton@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.session.cache;
import org.traccar.model.BaseModel;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.stream.Stream;
public class CacheGraph {
private final Map<CacheKey, CacheNode> roots = new HashMap<>();
private final WeakValueMap<CacheKey, CacheNode> nodes = new WeakValueMap<>();
void addObject(BaseModel value) {
CacheKey key = new CacheKey(value);
CacheNode node = new CacheNode(value);
roots.put(key, node);
nodes.put(key, node);
}
void removeObject(Class<? extends BaseModel> clazz, long id) {
CacheKey key = new CacheKey(clazz, id);
CacheNode node = nodes.remove(key);
if (node != null) {
node.getAllLinks(false).forEach(child -> child.getLinks(key.clazz(), true).remove(node));
}
roots.remove(key);
}
@SuppressWarnings("unchecked")
<T extends BaseModel> T getObject(Class<T> clazz, long id) {
CacheNode node = nodes.get(new CacheKey(clazz, id));
return node != null ? (T) node.getValue() : null;
}
<T extends BaseModel> Stream<T> getObjects(
Class<? extends BaseModel> fromClass, long fromId,
Class<T> clazz, Set<Class<? extends BaseModel>> proxies, boolean forward) {
CacheNode rootNode = nodes.get(new CacheKey(fromClass, fromId));
if (rootNode != null) {
return getObjectStream(rootNode, clazz, proxies, forward);
} else {
return Stream.empty();
}
}
@SuppressWarnings("unchecked")
private <T extends BaseModel> Stream<T> getObjectStream(
CacheNode rootNode, Class<T> clazz, Set<Class<? extends BaseModel>> proxies, boolean forward) {
if (proxies.contains(clazz)) {
return Stream.empty();
}
var directSteam = rootNode.getLinks(clazz, forward).stream()
.map(node -> (T) node.getValue());
var proxyStream = proxies.stream()
.flatMap(proxyClass -> rootNode.getLinks(proxyClass, forward).stream()
.flatMap(node -> getObjectStream(node, clazz, proxies, forward)));
return Stream.concat(directSteam, proxyStream);
}
void updateObject(BaseModel value) {
CacheNode node = nodes.get(new CacheKey(value));
if (node != null) {
node.setValue(value);
}
}
boolean addLink(
Class<? extends BaseModel> fromClazz, long fromId,
BaseModel toValue) {
boolean stop = true;
CacheNode fromNode = nodes.get(new CacheKey(fromClazz, fromId));
if (fromNode != null) {
CacheKey toKey = new CacheKey(toValue);
CacheNode toNode = nodes.get(toKey);
if (toNode == null) {
stop = false;
toNode = new CacheNode(toValue);
nodes.put(toKey, toNode);
}
fromNode.getLinks(toValue.getClass(), true).add(toNode);
toNode.getLinks(fromClazz, false).add(fromNode);
}
return stop;
}
void removeLink(
Class<? extends BaseModel> fromClazz, long fromId,
Class<? extends BaseModel> toClazz, long toId) {
CacheNode fromNode = nodes.get(new CacheKey(fromClazz, fromId));
if (fromNode != null) {
CacheNode toNode = nodes.get(new CacheKey(toClazz, toId));
if (toNode != null) {
fromNode.getLinks(toClazz, true).remove(toNode);
toNode.getLinks(fromClazz, false).remove(fromNode);
}
}
}
@Override
public String toString() {
StringBuilder stringBuilder = new StringBuilder();
for (CacheNode node : roots.values()) {
printNode(stringBuilder, node, "");
}
return stringBuilder.toString().trim();
}
private void printNode(StringBuilder stringBuilder, CacheNode node, String indentation) {
stringBuilder
.append('\n')
.append(indentation)
.append(node.getValue().getClass().getSimpleName())
.append('(').append(node.getValue().getId()).append(')');
node.getAllLinks(true).forEach(child -> printNode(stringBuilder, child, indentation + " "));
}
}
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