io.questdb.cairo.wal.seq.TableSequencer Maven / Gradle / Ivy

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/*******************************************************************************
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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.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
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package io.questdb.cairo.wal.seq;

import io.questdb.cairo.TableToken;
import io.questdb.std.QuietCloseable;

public interface TableSequencer extends QuietCloseable {
    long NO_TXN = Long.MIN_VALUE;

    void dropTable();

    TableMetadataChangeLog getMetadataChangeLog(long structureVersionLo);

    int getNextWalId();

    long getStructureVersion();

    int getTableId();

    /**
     * Copies table metadata to provided sink.
     *
     * @param sink metadata sink
     * @return current transaction number
     */
    long getTableMetadata(TableRecordMetadataSink sink);

    // return txn cursor to apply transaction from given point
    TransactionLogCursor getTransactionLogCursor(long seqTxn);

    boolean isSuspended();

    long lastTxn();

    long nextStructureTxn(long structureVersion, TableMetadataChange change);

    // returns committed txn number if schema version is the expected one, otherwise returns NO_TXN
    long nextTxn(long expectedStructureVersion, int walId, int segmentId, int segmentTxn);

    TableToken reload();

    void resumeTable();

    void suspendTable();
}