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RPC client for k8s services
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package com.lowdad.thrift.client;

import com.lowdad.thrift.client.config.RpcClientProperties;
import com.lowdad.thrift.client.func.ThriftCallFunc;
import com.lowdad.thrift.client.func.ThriftExecFunc;
import com.lowdad.thrift.client.config.TraceBinaryProtocol.Factory;
import lombok.extern.slf4j.Slf4j;
import org.apache.thrift.TServiceClient;
import org.apache.thrift.TServiceClientFactory;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TTransport;

import java.util.concurrent.*;

/**
 * @author lowdad
 */
@Slf4j
public abstract class AbstractThriftClient implements ThriftClient {

    private Class thriftClass;

    private static final Factory protocolFactory = new Factory();

    private TServiceClientFactory clientFactory;

    // For async call
    private ExecutorService threadPool;

    public void init() {
        try {
            clientFactory = getThriftClientFactoryClass().newInstance();
            log.info("[RPC] client init");
        } catch (Exception e) {
            throw new RuntimeException();
        }

        if (!check()) {
            throw new RuntimeException("[RPC] Client config failed check!");
        }

        threadPool = new ThreadPoolExecutor(
                Integer.valueOf(
                        RpcClientProperties.getInstance().getThreadPool().getCoreSize()),
                        Integer.valueOf(RpcClientProperties.getInstance().getThreadPool().getMaxSize()),
                        Integer.valueOf(RpcClientProperties.getInstance().getThreadPool().getKeepAlive()),
                TimeUnit.MICROSECONDS, new LinkedBlockingDeque<>());
        log.info("[RPC] client threadPool init ");
    }

    protected boolean check() {
        if (thriftClass == null) {
            return false;
        }
        return true;
    }

    @Override
    public  Future asyncCall(ThriftCallFunc tcall) {
        return threadPool.submit(() -> this.call(tcall));
    }

    @Override
    public  Future asyncExec(ThriftExecFunc texec) {
        return threadPool.submit(() -> this.exec(texec));
    }

    protected TCLIENT createClient(TTransport transport) throws Exception {
        // Step 1: get TProtocol
        TProtocol protocol = protocolFactory.getProtocol(transport);
        // Step 2: get client
        return clientFactory.getClient(protocol);

    }

    private Class> getThriftClientFactoryClass() {
        Class clientClazz = getThriftClientClass();
        if (clientClazz == null) {
            return null;
        }
        for (Class clazz : clientClazz.getDeclaredClasses()) {
            if (TServiceClientFactory.class.isAssignableFrom(clazz)) {
                return (Class>) clazz;
            }
        }
        return null;
    }

    private Class getThriftClientClass() {
        for (Class clazz : thriftClass.getDeclaredClasses()) {
            if (TServiceClient.class.isAssignableFrom(clazz)) {
                return (Class) clazz;
            }
        }
        return null;
    }

    public void setThriftClass(Class thriftClass) {
        this.thriftClass = thriftClass;
    }
}