From bc08f894df24c84de3ac2ad61d278b7015769498 Mon Sep 17 00:00:00 2001
From: Toshiya Kobayashi <toshiyakobayashi@gmail.com>
Date: Tue, 16 Apr 2024 17:37:04 +0900
Subject: [PATCH] [incubator-kie-drools-5841] Improve matches operator
 performance (#283)

---
 .../operators/MatchesBenchmark.java           | 93 +++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 drools-benchmarks-parent/drools-benchmarks/src/main/java/org/drools/benchmarks/operators/MatchesBenchmark.java

diff --git a/drools-benchmarks-parent/drools-benchmarks/src/main/java/org/drools/benchmarks/operators/MatchesBenchmark.java b/drools-benchmarks-parent/drools-benchmarks/src/main/java/org/drools/benchmarks/operators/MatchesBenchmark.java
new file mode 100644
index 00000000..908087d1
--- /dev/null
+++ b/drools-benchmarks-parent/drools-benchmarks/src/main/java/org/drools/benchmarks/operators/MatchesBenchmark.java
@@ -0,0 +1,93 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.drools.benchmarks.operators;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.drools.benchmarks.common.AbstractBenchmark;
+import org.drools.benchmarks.common.model.Account;
+import org.drools.benchmarks.common.util.BuildtimeUtil;
+import org.drools.benchmarks.common.util.RuntimeUtil;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.Level;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.infra.Blackhole;
+
+public class MatchesBenchmark extends AbstractBenchmark {
+
+    @Param({"16", "32"})
+    private int _rulesNumber;
+
+    @Param({"32", "256"})
+    private int _factsNumber;
+
+    @Param({"true", "false"})
+    private boolean cacheEnabled;
+
+    private Set<Account> accounts;
+
+    @Setup
+    public void setupKieBase() {
+
+        if (cacheEnabled) {
+            System.setProperty("drools.matches.compiled.cache.count", "100");
+        }
+
+        StringBuilder sb = new StringBuilder();
+        sb.append("import " + Account.class.getCanonicalName() + ";\n");
+
+        for (int i = 1; i <= _rulesNumber; i++) {
+
+            sb.append(" rule NameMatches" + i + "\n" +
+                    " when \n " +
+                    "     $account : Account(name matches \"A.*t" + i + "\")\n " +
+                    " then\n " +
+                    " end\n" );
+        }
+
+        // use canonical model
+        kieBase = BuildtimeUtil.createKieBaseFromDrl(true, sb.toString());
+    }
+
+    @Setup
+    public void generateFacts() {
+        accounts = new HashSet<>();
+        for (int i = 1; i <= _factsNumber; i++) {
+            final Account account = new Account();
+            account.setName("Account" + i);
+            accounts.add(account);
+        }
+    }
+
+    @Setup(Level.Iteration)
+    public void setup() {
+        kieSession = RuntimeUtil.createKieSession(kieBase);
+    }
+
+    @Benchmark
+    public int test(final Blackhole eater) {
+        for (Account account : accounts) {
+            eater.consume(kieSession.insert(account));
+        }
+        return kieSession.fireAllRules();
+    }
+}