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use only one thread for evictions

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Instead of spawning a new thread for every cache, we use a single thread
that will evict entries from all caches.
The thread keeps a weak reference to the caches, so that they can be
garbage collected.
This commit is contained in:
Andreas Huber
2018-11-24 08:32:05 +01:00
parent 64771417e4
commit 9889252205
2 changed files with 84 additions and 16 deletions
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8
pdb-utils/src/test/java/org/lucares/utils/cache/HotEntryCacheTest.java vendored
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@@ -37,11 +37,12 @@ public class HotEntryCacheTest {
public void testEvictOnGet() throws InterruptedException, ExecutionException, TimeoutException {
final ModifiableFixedTimeClock clock = new ModifiableFixedTimeClock();
final Duration timeToLive = Duration.ofSeconds(10);
final HotEntryCache<String, String> cache = new HotEntryCache<>(timeToLive, clock, 1, TimeUnit.MILLISECONDS);
final HotEntryCache<String, String> cache = new HotEntryCache<>(timeToLive, clock);
cache.put("key", "value1");
clock.plus(timeToLive.plusMillis(1));
cache.triggerEviction();
final String cachedValue1_evicted = cache.get("key");
Assert.assertEquals(cachedValue1_evicted, null);
@@ -50,7 +51,7 @@ public class HotEntryCacheTest {
public void testEvictionByBackgroundThread() throws InterruptedException, ExecutionException, TimeoutException {
final ModifiableFixedTimeClock clock = new ModifiableFixedTimeClock();
final Duration timeToLive = Duration.ofSeconds(10);
final HotEntryCache<String, String> cache = new HotEntryCache<>(timeToLive, clock, 1, TimeUnit.MILLISECONDS);
final HotEntryCache<String, String> cache = new HotEntryCache<>(timeToLive, clock);
final CompletableFuture<String> evictionEventFuture = new CompletableFuture<>();
cache.addListener(event -> {
@@ -60,6 +61,7 @@ public class HotEntryCacheTest {
cache.put("key", "value1");
clock.plus(timeToLive.plusMillis(1));
cache.triggerEviction();
final String evictedValue1 = evictionEventFuture.get(5, TimeUnit.MINUTES); // enough time for debugging
Assert.assertEquals(evictedValue1, "value1");
@@ -101,7 +103,7 @@ public class HotEntryCacheTest {
public void testForEachTouches() throws InterruptedException, ExecutionException, TimeoutException {
final ModifiableFixedTimeClock clock = new ModifiableFixedTimeClock();
final Duration timeToLive = Duration.ofSeconds(10);
final HotEntryCache<String, String> cache = new HotEntryCache<>(timeToLive, clock, 1, TimeUnit.HOURS);
final HotEntryCache<String, String> cache = new HotEntryCache<>(timeToLive, clock);
final CompletableFuture<String> evictionEventFuture = new CompletableFuture<>();
cache.addListener(event -> {