Add GL-Cache traces to the simulator

simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/parser/TraceFormat.java

@@ -31,6 +31,7 @@
 import com.github.benmanes.caffeine.cache.simulator.parser.camelab.CamelabTraceReader;
 import com.github.benmanes.caffeine.cache.simulator.parser.cloud_physics.CloudPhysicsTraceReader;
 import com.github.benmanes.caffeine.cache.simulator.parser.corda.CordaTraceReader;
+import com.github.benmanes.caffeine.cache.simulator.parser.glcache.GLCacheTraceReader;
 import com.github.benmanes.caffeine.cache.simulator.parser.gradle.GradleTraceReader;
 import com.github.benmanes.caffeine.cache.simulator.parser.kaggle.OutbrainTraceReader;
 import com.github.benmanes.caffeine.cache.simulator.parser.lirs.LirsTraceReader;
@@ -69,6 +70,7 @@ public enum TraceFormat {
   CAMELAB(CamelabTraceReader::new),
   CLOUD_PHYSICS(CloudPhysicsTraceReader::new),
   CORDA(CordaTraceReader::new),
+  GL_CACHE(GLCacheTraceReader::new),
   GRADLE(GradleTraceReader::new),
   LIRS(LirsTraceReader::new),
   LRB(LrbTraceReader::new),

simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/parser/glcache/GLCacheTraceReader.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2023 Ben Manes. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.github.benmanes.caffeine.cache.simulator.parser.glcache;
+
+import static com.github.benmanes.caffeine.cache.simulator.policy.Policy.Characteristic.WEIGHTED;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.util.Set;
+
+import com.github.benmanes.caffeine.cache.simulator.parser.BinaryTraceReader;
+import com.github.benmanes.caffeine.cache.simulator.policy.AccessEvent;
+import com.github.benmanes.caffeine.cache.simulator.policy.Policy.Characteristic;
+
+/**
+ * A reader for the trace files provided by the author of GL-Cache. See
+ * <a href="https://github.com/Thesys-lab/fast23-GLCache#traces">traces</a>.
+ *
+ * @author ben.manes@gmail.com (Ben Manes)
+ */
+public final class GLCacheTraceReader extends BinaryTraceReader {
+
+  public GLCacheTraceReader(String filePath) {
+    super(filePath);
+  }
+
+  @Override
+  public Set<Characteristic> characteristics() {
+    return Set.of(WEIGHTED);
+  }
+
+  @Override
+  protected AccessEvent readEvent(DataInputStream input) throws IOException {
+    /*
+     * struct {
+     *   uint32_t timestamp;
+     *   uint64_t obj_id;
+     *   uint32_t obj_size;
+     *   int64_t next_access_vtime;  // -1 if no next access
+     * }
+     */
+    input.readInt();
+    long key = input.readLong();
+    int weight = input.readInt();
+    input.readLong();
+
+    return AccessEvent.forKeyAndWeight(key, weight);
+  }
+}

simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/parser/glcache/package-info.java

@@ -0,0 +1,4 @@
+@CheckReturnValue
+package com.github.benmanes.caffeine.cache.simulator.parser.glcache;
+
+import com.google.errorprone.annotations.CheckReturnValue;