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QuestDB is high performance SQL time series database
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 *  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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 *  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.network;

import io.questdb.metrics.Counter;
import io.questdb.metrics.LongGauge;
import io.questdb.std.Numbers;
import io.questdb.std.Os;
import io.questdb.std.datetime.millitime.MillisecondClock;

public interface IODispatcherConfiguration {
    int BIAS_READ = 1;
    int BIAS_WRITE = 2;

    Counter listenerStateChangeCounter();

    int getBindIPv4Address();

    int getBindPort();

    MillisecondClock getClock();

    LongGauge getConnectionCountGauge();

    default String getDispatcherLogName() {
        return "IODispatcher";
    }

    EpollFacade getEpollFacade();

    default int getEventCapacity() {
        return Numbers.ceilPow2(getLimit());
    }

    long getHeartbeatInterval();

    default boolean getHint() {
        return false;
    }

    default int getIOQueueCapacity() {
        return Numbers.ceilPow2(getLimit());
    }

    default int getInitialBias() {
        return BIAS_READ;
    }

    default int getInterestQueueCapacity() {
        return Numbers.ceilPow2(getLimit());
    }

    KqueueFacade getKqueueFacade();

    int getLimit();

    default int getListenBacklog() {
        if (Os.isWindows() && getHint()) {
            // Windows OS might have a limit of 200 concurrent connections. To overcome
            // this limit we set backlog value to a hint as described here:
            /// https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-listen
            // the hint is -backlog
            return -getLimit();
        }
        return getLimit();
    }

    // OS socket buffer size
    int getNetRecvBufferSize();

    // OS socket buffer size
    int getNetSendBufferSize();

    NetworkFacade getNetworkFacade();

    default boolean getPeerNoLinger() {
        return false;
    }

    long getQueueTimeout();

    // user-land buffer size
    int getRecvBufferSize();

    SelectFacade getSelectFacade();

    // user-land buffer size
    int getSendBufferSize();

    int getTestConnectionBufferSize();

    long getTimeout();
}