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Implement a cache for top tens (#309)

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tastybento 2024-05-04 12:36:03 -07:00 committed by GitHub
parent a4f8d12138
commit 4d16e9c227
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2 changed files with 268 additions and 220 deletions
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20
src/main/java/world/bentobox/level/LevelsManager.java
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@ -2,6 +2,7 @@ package world.bentobox.level;
import java.math.BigInteger;
import java.text.DecimalFormat;
import java.time.Instant;
import java.util.AbstractMap;
import java.util.Collections;
import java.util.HashMap;
@ -31,6 +32,7 @@ import world.bentobox.level.events.IslandPreLevelEvent;
import world.bentobox.level.objects.IslandLevels;
import world.bentobox.level.objects.LevelsData;
import world.bentobox.level.objects.TopTenData;
import world.bentobox.level.util.CachedData;
public class LevelsManager {
private static final String INTOPTEN = "intopten";
@ -52,6 +54,8 @@ public class LevelsManager {
private final Map<String, IslandLevels> levelsCache;
// Top ten lists
private final Map<World, TopTenData> topTenLists;
// Cache for top tens
private Map<World, CachedData> cache = new HashMap<>();
public LevelsManager(Level addon) {
this.addon = addon;
@ -339,7 +343,19 @@ public class LevelsManager {
@NonNull
public Map<String, Long> getTopTen(@NonNull World world, int size) {
createAndCleanRankings(world);
// Return the sorted map
CachedData cachedData = cache.get(world);
Instant now = Instant.now();
if (cachedData != null && cachedData.getLastUpdated().plusSeconds(1).isAfter(now)) {
return cachedData.getCachedMap();
} else {
Map<String, Long> newTopTen = calculateTopTen(world, size);
cache.put(world, new CachedData(newTopTen, now));
return newTopTen;
}
}
private Map<String, Long> calculateTopTen(@NonNull World world, int size) {
return Collections.unmodifiableMap(topTenLists.get(world).getTopTen().entrySet().stream()
.filter(l -> l.getValue() > 0).sorted(Collections.reverseOrder(Map.Entry.comparingByValue()))
.limit(size)
@ -416,6 +432,8 @@ public class LevelsManager {
public void removeEntry(World world, String uuid) {
if (topTenLists.containsKey(world)) {
topTenLists.get(world).getTopTen().remove(uuid);
// Invalidate the cache because of this deletion
cache.remove(world);
}
}

30
src/main/java/world/bentobox/level/util/CachedData.java Normal file
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@ -0,0 +1,30 @@
package world.bentobox.level.util;
import java.time.Instant;
import java.util.Map;
/**
* Cache for top tens
*/
public class CachedData {
private Map<String, Long> cachedMap;
private Instant lastUpdated;
public CachedData(Map<String, Long> cachedMap, Instant lastUpdated) {
this.cachedMap = cachedMap;
this.lastUpdated = lastUpdated;
}
public Map<String, Long> getCachedMap() {
return cachedMap;
}
public Instant getLastUpdated() {
return lastUpdated;
}
public void updateCache(Map<String, Long> newMap, Instant newUpdateTime) {
this.cachedMap = newMap;
this.lastUpdated = newUpdateTime;
}
}