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/**
 * Copyright (C) 2016 - 2030 youtongluan.
 *
 * 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
 * limitations under the License.
 */
package org.yx.rpc.server;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.List;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.locks.LockSupport;

import org.apache.mina.core.filterchain.DefaultIoFilterChainBuilder;
import org.apache.mina.core.service.IoHandler;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.executor.ExecutorFilter;
import org.apache.mina.transport.socket.SocketAcceptor;
import org.apache.mina.transport.socket.SocketSessionConfig;
import org.apache.mina.transport.socket.nio.NioSocketAcceptor;
import org.yx.bean.IOC;
import org.yx.bean.Loader;
import org.yx.conf.AppInfo;
import org.yx.conf.Const;
import org.yx.exception.SumkException;
import org.yx.log.Log;
import org.yx.log.Logs;
import org.yx.main.StartContext;
import org.yx.rpc.codec.SumkCodecFactory;
import org.yx.util.ExceptionUtil;

public class MinaServer implements Runnable {

	private final String host;
	private int port;
	private IoHandler handler;
	private int acceptors;
	private SocketAcceptor acceptor;

	public void setAcceptors(int acceptors) {
		this.acceptors = acceptors;
	}

	public MinaServer(String host, int port, List handlers) {
		this.port = port;
		this.host = host;
		this.handler = createServerHandler(handlers);
	}

	public MinaServer(int port, List handlers) {
		this.host = null;
		this.port = port;
		this.handler = createServerHandler(handlers);
	}

	private IoHandler createServerHandler(List handlers) {
		String clzName = AppInfo.get("sumk.rpc.serverHandler", "org.yx.rpc.server.ServerHandler");
		try {
			return (IoHandler) Loader.newInstance(clzName, new Object[] { handlers }, new Class[] { List.class });
		} catch (Exception e) {
			Logs.rpc().error("初始化serverHandler失败", e);
			throw ExceptionUtil.toRuntimeException(e);
		}
	}

	protected InetSocketAddress listenAddr(boolean randomPort) {
		if (randomPort) {// 1万到6万之间
			port = 10000 + ThreadLocalRandom.current().nextInt(50000);
		}
		if (host == null || host.trim().length() == 0) {
			return new InetSocketAddress(port);
		}
		return new InetSocketAddress(host, port);

	}

	public synchronized void run() {
		if (acceptor != null) {
			return;
		}
		try {
			acceptor = acceptors > 0 ? new NioSocketAcceptor(acceptors) : new NioSocketAcceptor();
			acceptor.setReuseAddress(AppInfo.getBoolean("sumk.rpc.port.reuse", false));
			DefaultIoFilterChainBuilder chain = acceptor.getFilterChain();

			chain.addLast("codec", new ProtocolCodecFilter(IOC.get(SumkCodecFactory.class)));

			chain.addLast("threadpool",
					new ExecutorFilter(StartContext.inst().getExecutorService("sumk.rpc.server.executor")));

			acceptor.setHandler(handler);

			acceptor.getSessionConfig().setIdleTime(IdleStatus.BOTH_IDLE, AppInfo.getInt(Const.SOA_SESSION_IDLE, 600));
			if (acceptor.getSessionConfig() instanceof SocketSessionConfig) {
				SocketSessionConfig conf = (SocketSessionConfig) acceptor.getSessionConfig();
				conf.setKeepAlive(AppInfo.getBoolean("sumk.rpc.server.conf.keepAlive", true));
				conf.setReceiveBufferSize(AppInfo.getInt("sumk.rpc.server.conf.receiveBufferSize", 100));
				conf.setSendBufferSize(AppInfo.getInt("sumk.rpc.server.conf.sendBufferSize", 8192));
			}
			boolean randomPort = this.port < 1;
			for (int i = 0; i < 50; i++) {
				try {
					InetSocketAddress addr = listenAddr(randomPort);
					acceptor.bind(addr);
					Log.get("sumk.rpc.server").info("rpc listening on " + addr);
					break;
				} catch (IOException e) {
					if (randomPort) {
						Log.get("sumk.rpc.server").info("{} was occupied,try another port...", this.port);
						continue;
					}
					Log.get("sumk.rpc.server").debug("waiting for listening to {}.{}", port, e.getMessage());
					int time = AppInfo.getInt("sumk.rpc.server.starting.sleep", 5000);
					LockSupport.parkUntil(System.currentTimeMillis() + time);
				}
			}

		} catch (Exception e) {
			Log.get("sumk.rpc.server").debug(e.getLocalizedMessage(), e);
			acceptor = null;
			throw new SumkException(38057306, "start mina server failed", e);
		}

	}

	public int getPort() {
		return port;
	}

	public void stop() throws IOException {
		if (this.acceptor == null) {
			return;
		}

		this.acceptor.dispose(false);
		this.acceptor = null;
	}
}