/*
 * Copyright 2016 The Netty Project
 *
 * The Netty Project licenses this file to you 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.
 */
package io.netty.channel.epoll;

This class is necessary to break the following cyclic dependency:

JNI_OnLoad
JNI Calls FindClass because RegisterNatives (used to register JNI methods) requires a class
FindClass loads the class, but static members variables of that class attempt to call a JNI method which has not
yet been registered.
java.lang.UnsatisfiedLinkError is thrown because native method has not yet been registered.

Static members which call JNI methods must not be declared in this class!
/**
 * This class is necessary to break the following cyclic dependency:
 * <ol>
 * <li>JNI_OnLoad</li>
 * <li>JNI Calls FindClass because RegisterNatives (used to register JNI methods) requires a class</li>
 * <li>FindClass loads the class, but static members variables of that class attempt to call a JNI method which has not
 * yet been registered.</li>
 * <li>java.lang.UnsatisfiedLinkError is thrown because native method has not yet been registered.</li>
 * </ol>
 * Static members which call JNI methods must not be declared in this class!
 */
final class NativeStaticallyReferencedJniMethods {

    private NativeStaticallyReferencedJniMethods() { }

    static native int epollin();
    static native int epollout();
    static native int epollrdhup();
    static native int epollet();
    static native int epollerr();
    static native long ssizeMax();
    static native int tcpMd5SigMaxKeyLen();
    static native int iovMax();
    static native int uioMaxIov();
    static native boolean isSupportingSendmmsg();
    static native boolean isSupportingTcpFastopen();
    static native String kernelVersion();
}