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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 org.apache.camel.component.netty;

import io.netty.channel.EventLoopGroup;
import io.netty.channel.epoll.Epoll;
import io.netty.channel.epoll.EpollEventLoopGroup;
import io.netty.channel.kqueue.KQueue;
import io.netty.channel.kqueue.KQueueEventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import org.apache.camel.util.concurrent.CamelThreadFactory;

/**
 * A builder to create Netty {@link io.netty.channel.EventLoopGroup} which can be used for executor boss events with
 * multiple Netty {@link org.apache.camel.component.netty.NettyServerBootstrapFactory} server bootstrap configurations.
 */
public final class NettyServerBossPoolBuilder {

    private String name = "NettyServerBoss";
    private String pattern;
    private int bossCount = 1;
    private boolean nativeTransport;

    public void setName(String name) {
        this.name = name;
    }

    public void setPattern(String pattern) {
        this.pattern = pattern;
    }

    public void setBossCount(int bossCount) {
        this.bossCount = bossCount;
    }

    public void setNativeTransport(boolean nativeTransport) {
        this.nativeTransport = nativeTransport;
    }

    public NettyServerBossPoolBuilder withName(String name) {
        setName(name);
        return this;
    }

    public NettyServerBossPoolBuilder withPattern(String pattern) {
        setPattern(pattern);
        return this;
    }

    public NettyServerBossPoolBuilder withBossCount(int bossCount) {
        setBossCount(bossCount);
        return this;
    }

    public NettyServerBossPoolBuilder withNativeTransport(boolean nativeTransport) {
        setNativeTransport(nativeTransport);
        return this;
    }

    /**
     * Creates a new boss pool.
     */
    public EventLoopGroup build() {
        if (nativeTransport) {
            if (KQueue.isAvailable()) {
                return new KQueueEventLoopGroup(bossCount, new CamelThreadFactory(pattern, name, false));
            } else if (Epoll.isAvailable()) {
                return new EpollEventLoopGroup(bossCount, new CamelThreadFactory(pattern, name, false));
            } else {
                throw new IllegalStateException(
                        "Unable to use native transport - both Epoll and KQueue are not available");
            }
        } else {
            return new NioEventLoopGroup(bossCount, new CamelThreadFactory(pattern, name, false));
        }
    }
}