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src/sql/engine/expr/ob_expr_func_sleep.cpp

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+/**
+ * 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.
+ */
+
+#define USING_LOG_PREFIX SQL_ENG
+
+#include "sql/engine/ob_exec_context.h"
+#include "sql/engine/expr/ob_expr_func_sleep.h"
+#include "lib/timezone/ob_time_convert.h"
+#include "sql/session/ob_sql_session_info.h"
+
+namespace oceanbase {
+using namespace common;
+namespace sql {
+
+ObExprSleep::ObExprSleep(ObIAllocator& alloc)
+    : ObFuncExprOperator(alloc, T_FUN_SYS_SLEEP, N_SYS_SLEEP, 1, NOT_ROW_DIMENSION)
+{}
+
+ObExprSleep::~ObExprSleep()
+{}
+
+int ObExprSleep::calc_result_type1(ObExprResType& type, ObExprResType& param, ObExprTypeCtx& type_ctx) const
+{
+  int ret = OB_SUCCESS;
+  type.set_int();
+  type.set_precision(common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObIntType].precision_);
+  type.set_scale(common::DEFAULT_SCALE_FOR_INTEGER);
+  CK(OB_NOT_NULL(type_ctx.get_session()));
+  if (OB_SUCC(ret) && type_ctx.get_session()->use_static_typing_engine()) {
+    param.set_calc_type(ObNumberType);
+  }
+  return ret;
+}
+
+int ObExprSleep::calc_result1(ObObj& result, const ObObj& param, ObExprCtx& expr_ctx) const
+{
+  int ret = 0;
+  int64_t usec = 0;
+  number::ObNumber nmb;
+  EXPR_DEFINE_CAST_CTX(expr_ctx, CM_NONE);
+  EXPR_GET_NUMBER_V2(param, nmb);
+  CK(OB_NOT_NULL(expr_ctx.calc_buf_));
+  if (OB_SUCC(ret)) {
+    if (OB_FAIL(get_usec(nmb, usec, *expr_ctx.calc_buf_))) {
+      ret = OB_SUCCESS;  // by design
+      result.set_int(0);
+    } else {
+      result.set_int(0);
+      ret = sleep(usec);
+    }
+  }
+  return ret;
+}
+
+int ObExprSleep::sleep(int64_t usec)
+{
+  int ret = OB_SUCCESS;
+  // do not worry about the overflow of this addition
+  // if it does happen, the usec_rem will be 0 inside the while loop
+  // and the loop will be break
+  int64_t dead_line = ObTimeUtility::current_time() + usec;
+  int64_t usec_rem = usec;
+  useconds_t usec_req = static_cast<useconds_t>(MIN(CHECK_INTERVAL_IN_US, usec_rem));
+  while (usec_req > 0) {
+    (void)usleep(usec_req);
+    if (OB_FAIL(THIS_WORKER.check_status())) {
+      break;
+    } else {
+      int64_t current_time = ObTimeUtility::current_time();
+      usec_rem = current_time < dead_line ? dead_line - current_time : 0;
+      usec_req = static_cast<useconds_t>(MIN(CHECK_INTERVAL_IN_US, usec_rem));
+    }
+  }  // end while
+  return ret;
+}
+
+int ObExprSleep::get_usec(const number::ObNumber& nmb, int64_t& value, ObIAllocator& alloc)
+{
+  int ret = OB_SUCCESS;
+  value = 0;
+  if (OB_SUCC(ret)) {
+    number::ObNumber other;
+    number::ObNumber res;
+    // use nsecond to check range
+    const int64_t nsecs_per_sec = NSECS_PER_SEC;
+    uint64_t tmp = 0;
+    number::ObNumber tmp_nmb;
+    if (OB_FAIL(other.from(nsecs_per_sec, alloc))) {
+      LOG_WARN("copy nmb failed", K(ret), K(nmb));
+    } else if (OB_FAIL(tmp_nmb.from(nmb, alloc))) {
+      LOG_WARN("copy nmb failed", K(ret), K(nmb));
+    } else if (OB_FAIL(tmp_nmb.round(SCALE_OF_SECOND))) {
+      LOG_WARN("round nmb failed", K(ret), K(tmp_nmb));
+    } else if (tmp_nmb.mul(other, res, alloc)) {
+      LOG_WARN("mul op failed", K(ret), K(other), K(tmp_nmb));
+    } else if (!res.is_valid_uint64(tmp)) {  // based on the behaviour of mysql.
+      ret = OB_INVALID_ARGUMENT;
+      LOG_WARN("out of range", K(ret), K(res), K(tmp));
+    } else {
+      // use usecond to calc
+      value = tmp / NSECS_PER_USEC;
+    }
+  }
+  return ret;
+}
+
+int ObExprSleep::eval_sleep(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res)
+{
+  int ret = OB_SUCCESS;
+  ObDatum* sec = NULL;
+  ObIAllocator& calc_alloc = ctx.get_reset_tmp_alloc();
+  int64_t usec = 0;
+  if (OB_FAIL(expr.eval_param_value(ctx, sec))) {
+    LOG_WARN("eval arg failed", K(ret));
+  } else if (sec->is_null()) {
+  } else if (OB_FAIL(get_usec(number::ObNumber(sec->get_number()), usec, calc_alloc))) {
+    ret = OB_SUCCESS;
+  } else {
+    ret = sleep(usec);
+  }
+  res.set_int(0);
+  return ret;
+}
+
+int ObExprSleep::cg_expr(ObExprCGCtx& ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(ctx);
+  UNUSED(raw_expr);
+  CK(1 == rt_expr.arg_cnt_);
+  OX(rt_expr.eval_func_ = eval_sleep);
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase