107 lines
2.8 KiB
C++
107 lines
2.8 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#ifndef OCEANBASE_SQL_PLAN_CACHE_OB_PLAN_CACHE_CALLBACK_
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#define OCEANBASE_SQL_PLAN_CACHE_OB_PLAN_CACHE_CALLBACK_
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#include "ob_pcv_set.h"
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namespace oceanbase
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{
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namespace sql
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{
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class ObLibCacheAtomicOp
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{
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protected:
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typedef common::hash::HashMapPair<ObILibCacheKey*, ObILibCacheNode *> LibCacheKV;
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public:
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ObLibCacheAtomicOp(const CacheRefHandleID ref_handle)
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: cache_node_(NULL), ref_handle_(ref_handle)
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{
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}
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virtual ~ObLibCacheAtomicOp() {}
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// get cache node and lock
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virtual int get_value(ObILibCacheNode *&cache_node);
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// get cache node and increase reference count
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void operator()(LibCacheKV &entry);
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protected:
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// when get value, need lock
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virtual int lock(ObILibCacheNode &cache_node) = 0;
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protected:
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// According to the interface of ObHashTable, all returned values will be passed
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// back to the caller via the callback functor.
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// cache_node_ - the plan cache value that is referenced.
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ObILibCacheNode *cache_node_;
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CacheRefHandleID ref_handle_;
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private:
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DISALLOW_COPY_AND_ASSIGN(ObLibCacheAtomicOp);
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};
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class ObLibCacheWlockAndRef : public ObLibCacheAtomicOp
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{
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public:
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ObLibCacheWlockAndRef(const CacheRefHandleID ref_handle)
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: ObLibCacheAtomicOp(ref_handle)
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{
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}
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virtual ~ObLibCacheWlockAndRef() {}
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int lock(ObILibCacheNode &cache_node)
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{
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return cache_node.lock(false/*wlock*/);
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};
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private:
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DISALLOW_COPY_AND_ASSIGN(ObLibCacheWlockAndRef);
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};
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class ObLibCacheRlockAndRef : public ObLibCacheAtomicOp
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{
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public:
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ObLibCacheRlockAndRef(const CacheRefHandleID ref_handle)
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: ObLibCacheAtomicOp(ref_handle)
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{
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}
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virtual ~ObLibCacheRlockAndRef() {}
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int lock(ObILibCacheNode &cache_node)
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{
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return cache_node.lock(true/*rlock*/);
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};
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private:
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DISALLOW_COPY_AND_ASSIGN(ObLibCacheRlockAndRef);
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};
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class ObCacheObjAtomicOp
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{
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protected:
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typedef common::hash::HashMapPair<ObCacheObjID, ObILibCacheObject *> ObjKV;
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public:
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ObCacheObjAtomicOp(const CacheRefHandleID ref_handle): cache_obj_(NULL), ref_handle_(ref_handle) {}
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virtual ~ObCacheObjAtomicOp() {}
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// get lock and increase reference count
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void operator()(ObjKV &entry);
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ObILibCacheObject *get_value() const { return cache_obj_; }
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protected:
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ObILibCacheObject *cache_obj_;
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const CacheRefHandleID ref_handle_;
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private:
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DISALLOW_COPY_AND_ASSIGN(ObCacheObjAtomicOp);
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};
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}
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}
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#endif // _OB_PLAN_CACHE_CALLBACK_H
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