andi/perfdb
1
0
Fork 0
Code Issues 1 Pull Requests Packages Projects Releases Activity

add LRU cache to PersistentMap

Browse Source 
This should speed up fetching and inserting of values
that are used often.
This commit is contained in:
Andreas Huber
2019-02-02 17:26:07 +01:00
parent d4d1685f9f
commit 2e48061793
1 changed files with 21 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
block-storage/src/main/java/org/lucares/pdb/map/PersistentMap.java
View File

@@ -124,6 +124,8 @@ public class PersistentMap<K, V> implements AutoCloseable {
private final LRUCache<Long, PersistentMapDiskNode> nodeCache = new LRUCache<>(10_000);
private final LRUCache<K, V> valueCache = new LRUCache<>(1_000);
public PersistentMap(final Path path, final EncoderDecoder<K> keyEncoder, final EncoderDecoder<V> valueEncoder)
throws IOException {
this.diskStore = new DiskStorage(path);
@@ -171,16 +173,32 @@ public class PersistentMap<K, V> implements AutoCloseable {
}
public synchronized V putValue(final K key, final V value) throws IOException {
final V cachedValue = valueCache.get(key);
if (cachedValue != null && cachedValue == value) {
return value;
}
final byte[] encodedKey = keyEncoder.encode(key);
final byte[] encodedValue = valueEncoder.encode(value);
final byte[] oldValue = putValue(encodedKey, encodedValue);
return oldValue == null ? null : valueEncoder.decode(oldValue);
final byte[] encodedOldValue = putValue(encodedKey, encodedValue);
final V oldValue = encodedOldValue == null ? null : valueEncoder.decode(encodedOldValue);
valueCache.put(key, value);
return oldValue;
}
public synchronized V getValue(final K key) throws IOException {
final V cachedValue = valueCache.get(key);
if (cachedValue != null) {
return cachedValue;
}
final byte[] encodedKey = keyEncoder.encode(key);
final byte[] foundValue = getValue(encodedKey);
return foundValue == null ? null : valueEncoder.decode(foundValue);
final V result = foundValue == null ? null : valueEncoder.decode(foundValue);
valueCache.put(key, result);
return result;
}
private byte[] putValue(final byte[] key, final byte[] value) throws IOException {