/*
 * 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.dubbo.rpc.protocol.tri;

import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.extension.ExtensionLoader;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.threadpool.manager.ExecutorRepository;
import org.apache.dubbo.common.utils.ExecutorUtil;
import org.apache.dubbo.remoting.RemotingException;
import org.apache.dubbo.remoting.exchange.PortUnificationExchanger;
import org.apache.dubbo.rpc.Exporter;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.Protocol;
import org.apache.dubbo.rpc.RpcException;
import org.apache.dubbo.rpc.protocol.AbstractExporter;
import org.apache.dubbo.rpc.protocol.AbstractProtocol;

import java.util.ArrayList;

import static org.apache.dubbo.common.constants.CommonConstants.DEFAULT_CLIENT_THREADPOOL;
import static org.apache.dubbo.common.constants.CommonConstants.THREADPOOL_KEY;

/**
 *
 */
public class TripleProtocol extends AbstractProtocol implements Protocol {

    private static final Logger logger = LoggerFactory.getLogger(TripleProtocol.class);
    private final PathResolver pathResolver = ExtensionLoader.getExtensionLoader(PathResolver.class)
            .getDefaultExtension();
    private final ExecutorRepository executorRepository = ExtensionLoader.getExtensionLoader(ExecutorRepository.class)
            .getDefaultExtension();

    @Override
    public int getDefaultPort() {
        return 50051;
    }

    @Override
    public <T> Exporter<T> export(Invoker<T> invoker) throws RpcException {
        URL url = invoker.getUrl();
        String key = serviceKey(url);
        final AbstractExporter<T> exporter = new AbstractExporter<T>(invoker) {
            @Override
            public void afterUnExport() {
                pathResolver.remove(url.getServiceKey());
                pathResolver.remove(url.getServiceInterface());
                exporterMap.remove(key);
            }
        };

        exporterMap.put(key, exporter);

        invokers.add(invoker);

        pathResolver.add(url.getServiceKey(), invoker);
        pathResolver.add(url.getServiceInterface(), invoker);
        PortUnificationExchanger.bind(invoker.getUrl());
        return exporter;
    }

    @Override
    public <T> Invoker<T> refer(Class<T> type, URL url) throws RpcException {
        TripleInvoker<T> invoker;
        try {
            url = ExecutorUtil.setThreadName(url, "DubboClientHandler");
            url = url.addParameterIfAbsent(THREADPOOL_KEY, DEFAULT_CLIENT_THREADPOOL);
            executorRepository.createExecutorIfAbsent(url);
            invoker = new TripleInvoker<>(type, url, invokers);
        } catch (RemotingException e) {
            throw new RpcException("Fail to create remoting client for service(" + url + "): " + e.getMessage(), e);
        }
        invokers.add(invoker);
        return invoker;
    }

    @Override
    protected <T> Invoker<T> protocolBindingRefer(Class<T> type, URL url) throws RpcException {
        return null;
    }

    @Override
    public void destroy() {
        PortUnificationExchanger.close();
        pathResolver.destroy();
        for (String key : new ArrayList<>(exporterMap.keySet())) {
            Exporter<?> exporter = exporterMap.remove(key);
            if (exporter != null) {
                try {
                    if (logger.isInfoEnabled()) {
                        logger.info("Unexport service: " + exporter.getInvoker().getUrl());
                    }
                    exporter.unexport();
                } catch (Throwable t) {
                    logger.warn(t.getMessage(), t);
                }
            }
        }

    }
}
