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QuestDB is high performance SQL time series database

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 QuestDB
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 *  You may obtain a copy of the License at
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 *  http://www.apache.org/licenses/LICENSE-2.0
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package io.questdb.std.filewatch;

import io.questdb.FileEventCallback;
import io.questdb.KqueueFileWatcher;
import io.questdb.network.EpollFacadeImpl;
import io.questdb.std.Os;
import io.questdb.std.str.Utf8Sequence;
import org.jetbrains.annotations.NotNull;

// File watchers were added for the purpose of config file reload,
// but since they aren't reliable reload_config() SQL function
// was introduced.
//
// Still, file watchers may be handy in the future, so we kept them.
public class FileWatcherFactory {

    public static FileWatcher getFileWatcher(@NotNull Utf8Sequence filePath, @NotNull FileEventCallback callback) {
        if (filePath.size() == 0) {
            throw new IllegalArgumentException("file to watch cannot be empty");
        }
        if (Os.isOSX() || Os.isFreeBSD()) {
            return new KqueueFileWatcher(filePath, callback);
        } else if (Os.isWindows()) {
            return new FileWatcherWindows(WindowsAccessorImpl.INSTANCE, filePath, callback);
        } else {
            return new LinuxFileWatcher(LinuxAccessorFacadeImpl.INSTANCE, EpollFacadeImpl.INSTANCE, filePath, callback);
        }
    }
}