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Fix race condition where one server will respond first if it happens to be faster.

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This commit is contained in:
Matthew Messinger 2018-01-02 03:02:08 -05:00
parent b0e30dbcdc
commit 2c592768d3
1 changed files with 6 additions and 4 deletions
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8
src/hdskins/java/com/voxelmodpack/hdskins/skins/AbstractSkinServer.java
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@ -1,5 +1,6 @@
package com.voxelmodpack.hdskins.skins;
import com.google.common.base.Preconditions;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
@ -22,8 +23,6 @@ public abstract class AbstractSkinServer implements SkinServer {
protected static final ExecutorService skinDownloadExecutor = Executors.newCachedThreadPool();
protected static final ListeningExecutorService skinUploadExecutor = MoreExecutors.listeningDecorator(Executors.newSingleThreadExecutor());
public static final MinecraftTexturesPayload EMPTY_PAYLOAD = new MinecraftTexturesPayload();
private LoadingCache<GameProfile, Optional<MinecraftTexturesPayload>> skins = CacheBuilder.newBuilder()
.initialCapacity(20)
.maximumSize(100)
@ -32,15 +31,18 @@ public abstract class AbstractSkinServer implements SkinServer {
@Override
public Optional<MinecraftTexturesPayload> load(GameProfile key) {
Preconditions.checkNotNull(key, "profile cannot be null");
// prevent race condition where one server responds faster than the previous one
synchronized (key) {
return loadProfileData(key);
}
}
}, Optional.empty(), skinDownloadExecutor));
protected abstract Optional<MinecraftTexturesPayload> loadProfileData(GameProfile profile);
@Override
public final Optional<MinecraftTexturesPayload> getProfileData(GameProfile profile) {
boolean was = !skins.asMap().containsKey(profile);
Optional<MinecraftTexturesPayload> textures = skins.getUnchecked(profile);
// This is the initial value. Refreshing will load it syncronously.