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/*
 * Copyright 2017-2019 CodingApi .
 *
 * 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 com.codingapi.txlcn.tracing.dubbo;

import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.rpc.Invocation;
import com.alibaba.dubbo.rpc.Invoker;
import com.alibaba.dubbo.rpc.RpcContext;
import com.alibaba.fastjson.JSONObject;
import com.codingapi.txlcn.tracing.TracingContext;
import lombok.extern.slf4j.Slf4j;

import java.util.List;


/**
 * Description:
 * Company: CodingApi
 * Date: 2018/12/14
 *
 * @author ujued
 */
@Slf4j
class DubboTxlcnLoadBalance {

    private static final String empty = "";

    static  Invoker chooseInvoker(List> invokers, URL url, Invocation invocation, TxLcnLoadBalance loadBalance) {

        //非分布式事务直接执行默认业务.
        if(!TracingContext.tracing().hasGroup()){
            return loadBalance.select(invokers, url, invocation);
        }
        TracingContext.tracing()
                .addApp(RpcContext.getContext().getLocalAddressString(), empty);
        assert invokers.size() > 0;
        JSONObject appMap = TracingContext.tracing().appMap();
        log.debug("invokers: {}", invokers);
        Invoker chooseInvoker = null;
        outline:
        for (Invoker tInvoker : invokers) {
            for (String address : appMap.keySet()) {
                if (address.equals(tInvoker.getUrl().getAddress())) {
                    chooseInvoker = tInvoker;
                    log.debug("txlcn choosed server [{}] in txGroup: {}", tInvoker, TracingContext.tracing().groupId());
                    break outline;
                }
            }
        }
        if (chooseInvoker == null) {
            Invoker invoker = loadBalance.select(invokers, url, invocation);
            TracingContext.tracing().addApp(invoker.getUrl().getAddress(), empty);
            return invoker;
        }
        return chooseInvoker;
    }

    @FunctionalInterface
    public interface TxLcnLoadBalance {
         Invoker select(List> invokers, URL url, Invocation invocation);
    }
}