be/src/olap/tablet_schema_cache.cpp

// Licensed to the Apache Software Foundation (ASF) under one
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// 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,
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// specific language governing permissions and limitations
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#include "olap/tablet_schema_cache.h"

#include <gen_cpp/olap_file.pb.h>

#include "bvar/bvar.h"
#include "olap/tablet_schema.h"

bvar::Adder<int64_t> g_tablet_schema_cache_count("tablet_schema_cache_count");
bvar::Adder<int64_t> g_tablet_schema_cache_columns_count("tablet_schema_cache_columns_count");

namespace doris {

std::pair<Cache::Handle*, TabletSchemaSPtr> TabletSchemaCache::insert(const std::string& key) {
    auto* lru_handle = cache()->lookup(key);
    TabletSchemaSPtr tablet_schema_ptr;
    if (lru_handle) {
        auto* value = (CacheValue*)cache()->value(lru_handle);
        value->last_visit_time = UnixMillis();
        tablet_schema_ptr = value->tablet_schema;
    } else {
        auto* value = new CacheValue;
        value->last_visit_time = UnixMillis();
        tablet_schema_ptr = std::make_shared<TabletSchema>();
        TabletSchemaPB pb;
        pb.ParseFromString(key);
        tablet_schema_ptr->init_from_pb(pb);
        value->tablet_schema = tablet_schema_ptr;
        auto deleter = [](const doris::CacheKey& key, void* value) {
            auto* cache_value = (CacheValue*)value;
            g_tablet_schema_cache_count << -1;
            g_tablet_schema_cache_columns_count << -cache_value->tablet_schema->num_columns();
            delete cache_value;
        };
        lru_handle = cache()->insert(key, value, tablet_schema_ptr->num_columns(), deleter,
                                     CachePriority::NORMAL, 0);
        g_tablet_schema_cache_count << 1;
        g_tablet_schema_cache_columns_count << tablet_schema_ptr->num_columns();
    }
    DCHECK(lru_handle != nullptr);
    return std::make_pair(lru_handle, tablet_schema_ptr);
}

void TabletSchemaCache::release(Cache::Handle* lru_handle) {
    cache()->release(lru_handle);
}

} // namespace doris