Fix the low utilization of SimpleAllocer

deps/oblib/unittest/lib/hash/test_hashutils.cpp

@@ -0,0 +1,87 @@
+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#include <pthread.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <sys/time.h>
+#include <unistd.h>
+#define private public
+#include "lib/hash/ob_hashset.h"
+#include "lib/hash/ob_hashutils.h"
+#undef private
+#include "lib/allocator/ob_malloc.h"
+
+#include "gtest/gtest.h"
+
+using namespace oceanbase;
+using namespace common;
+using namespace hash;
+
+class TestHashUtils: public ::testing::Test
+{
+public:
+  virtual void SetUp() {}
+  virtual void TearDown() {}
+};
+
+struct MySimpleAllocer
+{
+public:
+  explicit MySimpleAllocer()
+  {
+    used_cnt_ = 0;
+  }
+  void *alloc(const int64_t sz)
+  {
+    used_cnt_++;
+    return ob_malloc(sz, attr_);
+  }
+  void free(void *p)
+  {
+    ob_free(p);
+    used_cnt_--;
+  }
+  void set_attr(const ObMemAttr &attr) { attr_ = attr; }
+  void set_label(const lib::ObLabel &label) { attr_.label_ = label; }
+  int64_t used_cnt_;
+  ObMemAttr attr_;
+};
+
+TEST_F(TestHashUtils, Basic)
+{
+  static constexpr int NODE_NUM = 2;
+  using TestAlloc = hash::SimpleAllocer<int, NODE_NUM, SpinMutexDefendMode, MySimpleAllocer>;
+  TestAlloc alloc;
+  int *obj = alloc.alloc();
+  ASSERT_TRUE(obj != NULL);
+  int *obj2 = alloc.alloc();
+  ASSERT_TRUE(obj2 != NULL);
+  alloc.free(obj2);
+  int *obj3 = alloc.alloc();
+  ASSERT_EQ(obj3, obj2);
+  alloc.free(obj3);
+  int *obj4 = alloc.alloc();
+  ASSERT_EQ(obj4, obj3);
+  alloc.free(obj);
+  alloc.free(obj4);
+  ASSERT_EQ(0, alloc.allocer_.used_cnt_);
+}
+
+int main(int argc, char **argv)
+{
+  oceanbase::common::ObLogger::get_logger().set_log_level("INFO");
+  OB_LOGGER.set_log_level("INFO");
+  testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}