Optimize ehcache's usage in the simulator

This change results in the same hit rate and has a 37% faster runtime.
For the DS1 trace this reduces from 91 minutes to 67 minutes, which is
still abysmal compared 15-30 seconds of all other caches. Unfortunately
this issue has been known and rejected since 2015. A simple change is
to hash the key to improve the distribution, resulting in a 1.4 minute
runtime, but it reduces the hit rate in for their sampled lru policy.

gradle/dependencies.gradle

@@ -52,17 +52,17 @@ ext {
     jmh: '1.35',
     joor: '0.9.14',
     jsr330: '1',
-    nullaway: '0.10.0',
+    nullaway: '0.10.1',
     ohc: '0.6.1',
     osgiComponentAnnotations: '1.5.0',
     picocli: '4.6.3',
-    slf4j: '2.0.0',
+    slf4j: '2.0.1',
     tcache: '2.0.1',
     stream: '2.9.8',
     univocityParsers: '2.9.1',
     ycsb: '0.17.0',
     xz: '1.9',
-    zstd: '1.5.2-3',
+    zstd: '1.5.2-4',
   ]
   testVersions = [
     awaitility: '4.2.0',
@@ -89,7 +89,7 @@ ext {
     bnd: '6.3.1',
     checkstyle: '10.3.3',
     coveralls: '2.12.0',
-    dependencyCheck: '7.1.2',
+    dependencyCheck: '7.2.0',
     errorprone: '2.0.2',
     findsecbugs: '1.12.0',
     jacoco: '0.8.7',

simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/policy/product/Ehcache3Policy.java

@@ -57,10 +57,11 @@ public Ehcache3Policy(Config config) {
 
   @Override
   public void record(long key) {
-    Object value = cache.putIfAbsent(key, key);
+    var value = cache.get(key);
     if (value == null) {
-      size++;
+      cache.put(key, Boolean.TRUE);
       policyStats.recordMiss();
+      size++;
       if (size > maximumSize) {
         policyStats.recordEviction();
         size--;

simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/policy/product/ExpiringMapPolicy.java

@@ -39,7 +39,7 @@
  */
 @PolicySpec(name = "product.ExpiringMap")
 public final class ExpiringMapPolicy implements KeyOnlyPolicy {
-  private final ExpiringMap<Object, Object> cache;
+  private final ExpiringMap<Long, Boolean> cache;
   private final PolicyStats policyStats;
 
   public ExpiringMapPolicy(ExpiringMapSettings settings, Eviction policy) {
@@ -60,12 +60,12 @@ public static Set<Policy> policies(Config config) {
 
   @Override
   public void record(long key) {
-    Object value = cache.get(key);
+    var value = cache.get(key);
     if (value == null) {
       if (cache.size() == cache.getMaxSize()) {
         policyStats.recordEviction();
       }
-      cache.put(key, key);
+      cache.put(key, Boolean.TRUE);
       policyStats.recordMiss();
     } else {
       policyStats.recordHit();

simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/policy/product/HazelcastPolicy.java

@@ -50,7 +50,7 @@
  */
 @PolicySpec(name = "product.Hazelcast")
 public final class HazelcastPolicy implements KeyOnlyPolicy {
-  private final NearCache<Long, Long> cache;
+  private final NearCache<Long, Boolean> cache;
   private final PolicyStats policyStats;
   private final int maximumSize;
 
@@ -85,7 +85,7 @@ public void record(long key) {
       if (cache.size() == maximumSize) {
         policyStats.recordEviction();
       }
-      cache.put(key, /* keyData */ null, key, /* valueDate */ null);
+      cache.put(key, /* keyData */ null, Boolean.TRUE, /* valueDate */ null);
       policyStats.recordMiss();
     } else {
       policyStats.recordHit();

simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/policy/product/TCachePolicy.java

@@ -39,12 +39,12 @@
  */
 @PolicySpec(name = "product.TCache")
 public final class TCachePolicy implements KeyOnlyPolicy {
-  private final Cache<Object, Object> cache;
+  private final Cache<Long, Boolean> cache;
   private final PolicyStats policyStats;
 
   public TCachePolicy(TCacheSettings settings, Eviction policy) {
     policyStats = new PolicyStats(name() + " (%s)", policy);
-    cache = TCacheFactory.standardFactory().builder()
+    cache = TCacheFactory.standardFactory().<Long, Boolean>builder()
         .setMaxElements(Ints.checkedCast(settings.maximumSize()))
         .setEvictionPolicy(policy.type)
         .setStatistics(true)
@@ -64,7 +64,7 @@ public void record(long key) {
     Object value = cache.get(key);
     if (value == null) {
       policyStats.recordMiss();
-      cache.put(key, key);
+      cache.put(key, Boolean.TRUE);
     } else {
       policyStats.recordHit();
     }