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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2022 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
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 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb.cairo.sql;

import io.questdb.griffin.SqlException;

import java.io.Closeable;

public interface OperationFuture extends Closeable {
    int QUERY_NO_RESPONSE = 0;
    int QUERY_STARTED = 1;
    int QUERY_COMPLETE = 2;

    /***
     * Blocking wait for query completion. Returns immediately if query has executed synchronously
     * Waits in busy waiting for cairo.writer.alter.busy.wait.timeout.micro microseconds and throws timeout
     * @throws SqlException when query execution times out or fails
     */
    void await() throws SqlException;

    /***
     * Waits for completion within specified timeout. Can be called multiple times on the same OperationFuture instance.
     * @param timeout - microseconds timeout
     * @return
     *  - QUERY_NO_RESPONSE if no writer response received
     *  - QUERY_STARTED if writer command ACK received
     *  - QUERY_COMPLETE if writer completed response received
     * @throws SqlException when query execution fails
     */
    int await(long timeout) throws SqlException;

    long getInstanceId();

    /***
     * True if operation completed, false otherwise
     * @return
     *  - QUERY_NO_RESPONSE if no writer response received
     *  - QUERY_STARTED if writer command ACK received
     *  - QUERY_COMPLETE if writer completed response received
     */
    int getStatus();

    /***
     * Returns the number of rows affected by the command run asynchronously
     * @return
     *  - number of rows changed
     */
    long getAffectedRowsCount();

    /***
     * In case of async execution close must be called to remove sequence
     */
    @Override
    void close();
}