CommonCore/src/de/steamwar/command/TabCompletionCache.java

85 Zeilen
3.5 KiB
Java

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/*
* This file is a part of the SteamWar software.
*
* Copyright (C) 2020 SteamWar.de-Serverteam
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
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package de.steamwar.command;
import lombok.AllArgsConstructor;
import lombok.EqualsAndHashCode;
import lombok.experimental.UtilityClass;
import java.util.*;
import java.util.function.Supplier;
@UtilityClass
public class TabCompletionCache {
private Map<Key, TabCompletions> tabCompletionCache = new HashMap<>();
Set<AbstractTypeMapper<?, ?>> cached = new HashSet<>();
Set<AbstractTypeMapper<?, ?>> global = new HashSet<>();
Map<AbstractTypeMapper<?, ?>, Long> cacheDuration = new HashMap<>();
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void add(AbstractTypeMapper<?, ?> typeMapper, AbstractSWCommand.Cached cached) {
if (cached != null) {
TabCompletionCache.cached.add(typeMapper);
if (cached.global()) TabCompletionCache.global.add(typeMapper);
TabCompletionCache.cacheDuration.put(typeMapper, cached.timeUnit().toMillis(cached.cacheDuration()));
}
}
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@EqualsAndHashCode
@AllArgsConstructor
private static class Key {
private Object sender;
private AbstractTypeMapper<?, ?> typeMapper;
}
@AllArgsConstructor
private static class TabCompletions {
private AbstractSWCommand<?> command;
private long timestamp;
private Collection<String> tabCompletions;
}
Collection<String> tabComplete(Object sender, AbstractTypeMapper<?, ?> typeMapper, AbstractSWCommand<?> command, Supplier<Collection<String>> tabCompleteSupplier) {
if (!cached.contains(typeMapper)) return tabCompleteSupplier.get();
Key key = global.contains(typeMapper) ? new Key(null, typeMapper) : new Key(sender, typeMapper);
TabCompletions tabCompletions = tabCompletionCache.computeIfAbsent(key, ignore -> {
return new TabCompletions(command, System.currentTimeMillis(), tabCompleteSupplier.get());
});
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if (tabCompletions.command != command || System.currentTimeMillis() - tabCompletions.timestamp > cacheDuration.get(typeMapper)) {
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tabCompletions = new TabCompletions(command, System.currentTimeMillis(), tabCompleteSupplier.get());
tabCompletionCache.put(key, tabCompletions);
}
tabCompletions.timestamp = System.currentTimeMillis();
return tabCompletions.tabCompletions;
}
public void invalidateOldEntries() {
Set<Key> toRemove = new HashSet<>();
for (Map.Entry<Key, TabCompletions> tabCompletionsEntry : tabCompletionCache.entrySet()) {
if (System.currentTimeMillis() - tabCompletionsEntry.getValue().timestamp > cacheDuration.get(tabCompletionsEntry.getKey().typeMapper)) {
toRemove.add(tabCompletionsEntry.getKey());
}
}
for (Key key : toRemove) {
tabCompletionCache.remove(key);
}
}
}