io.questdb.cairo.TableNameRegistryRO Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2023 QuestDB
 *
 *  Licensed 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.
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package io.questdb.cairo;

import io.questdb.std.ConcurrentHashMap;
import io.questdb.std.ObjList;
import io.questdb.std.datetime.millitime.MillisecondClock;
import org.jetbrains.annotations.Nullable;

import java.util.function.Predicate;

public class TableNameRegistryRO extends AbstractTableNameRegistry {
    private final long autoReloadTimeout;
    private final MillisecondClock clockMs;
    private volatile long lastReloadTimestampMs = 0;
    private ConcurrentHashMap nameTableTokenMap = new ConcurrentHashMap<>(false);
    private ConcurrentHashMap nameTableTokenMap2 = new ConcurrentHashMap<>(false);
    private ConcurrentHashMap reverseTableNameTokenMap = new ConcurrentHashMap<>();
    private ConcurrentHashMap reverseTableNameTokenMap2 = new ConcurrentHashMap<>();

    public TableNameRegistryRO(CairoConfiguration configuration, Predicate protectedTableResolver) {
        super(configuration, protectedTableResolver);
        this.clockMs = configuration.getMillisecondClock();
        long timeout = configuration.getTableRegistryAutoReloadFrequency();
        this.autoReloadTimeout = timeout > 0 ? timeout : Long.MAX_VALUE;
        setNameMaps(nameTableTokenMap, reverseTableNameTokenMap);
    }

    @Override
    public TableToken addTableAlias(String newName, TableToken tableToken) {
        throw CairoException.critical(0).put("instance is read only");
    }

    @Override
    public boolean dropTable(TableToken token) {
        throw CairoException.critical(0).put("instance is read only");
    }

    @Override
    public TableToken getTableToken(CharSequence tableName) {
        TableToken record = nameTableTokenMap.get(tableName);
        if (record == null && clockMs.getTicks() - lastReloadTimestampMs > autoReloadTimeout) {
            reloadTableNameCacheThrottled();
            return nameTableTokenMap.get(tableName);
        }
        return record;
    }

    @Override
    public TableToken lockTableName(String tableName, String dirName, int tableId, boolean isWal) {
        throw CairoException.critical(0).put("instance is read only");
    }

    @Override
    public void purgeToken(TableToken token) {
        throw CairoException.critical(0).put("instance is read only");
    }

    @Override
    public void registerName(TableToken tableToken) {
        throw CairoException.critical(0).put("instance is read only");
    }

    @Override
    public synchronized void reloadTableNameCache(@Nullable ObjList convertedTables) {
        nameTableTokenMap2.clear();
        reverseTableNameTokenMap2.clear();
        nameStore.reload(nameTableTokenMap2, reverseTableNameTokenMap2, convertedTables);

        // Swap the maps
        setNameMaps(nameTableTokenMap2, reverseTableNameTokenMap2);

        ConcurrentHashMap tmp = nameTableTokenMap2;
        nameTableTokenMap2 = nameTableTokenMap;
        nameTableTokenMap = tmp;

        ConcurrentHashMap tmp2 = reverseTableNameTokenMap2;
        reverseTableNameTokenMap2 = reverseTableNameTokenMap;
        reverseTableNameTokenMap = tmp2;

        lastReloadTimestampMs = clockMs.getTicks();
    }

    @Override
    public void removeAlias(TableToken tableToken) {
        throw CairoException.critical(0).put("instance is read only");
    }

    @Override
    public TableToken rename(CharSequence oldName, CharSequence newName, TableToken tableToken) {
        throw CairoException.critical(0).put("instance is read only");
    }

    @Override
    public void replaceAlias(TableToken alias, TableToken replaceWith) {
        throw CairoException.critical(0).put("instance is read only");
    }

    @Override
    public void unlockTableName(TableToken tableToken) {
        throw CairoException.critical(0).put("instance is read only");
    }

    private synchronized void reloadTableNameCacheThrottled() {
        if (clockMs.getTicks() - lastReloadTimestampMs > autoReloadTimeout) {
            reloadTableNameCache();
        }
    }
}