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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 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
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package io.questdb.std;

public class IOURingFacadeImpl implements IOURingFacade {

    public static final IOURingFacadeImpl INSTANCE = new IOURingFacadeImpl();
    private static final boolean available;

    /**
     * io_uring is available since kernel 5.1, but we require 5.12 to avoid ulimit -l issues.
     */
    public static boolean isAvailableOn(String kernelVersion) {
        final String[] versionParts = kernelVersion.split("\\.");
        if (versionParts.length < 3) {
            return false;
        }

        int major;
        try {
            major = Numbers.parseInt(versionParts[0]);
        } catch (NumericException e) {
            return false;
        }

        if (major < 5) {
            return false;
        }
        if (major > 5) {
            return true;
        }

        int minor;
        try {
            minor = Numbers.parseInt(versionParts[1]);
        } catch (NumericException e) {
            return false;
        }

        return minor > 11;
    }

    @Override
    public void close(long ptr) {
        IOUringAccessor.close(ptr);
    }

    @Override
    public long create(int capacity) {
        return IOUringAccessor.create(capacity);
    }

    @Override
    public int errno() {
        return Os.errno();
    }

    @Override
    public boolean isAvailable() {
        return available;
    }

    @Override
    public IOURing newInstance(int capacity) {
        return new IOURingImpl(this, capacity);
    }

    @Override
    public int submit(long ptr) {
        return IOUringAccessor.submit(ptr);
    }

    @Override
    public int submitAndWait(long ptr, int waitNr) {
        return IOUringAccessor.submitAndWait(ptr, waitNr);
    }

    static {
        if (Os.type != Os.LINUX) {
            available = false;
        } else {
            String kernelVersion = IOUringAccessor.kernelVersion();
            available = isAvailableOn(kernelVersion);
        }
    }
}