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package org.redkale.net.sncp;

import java.lang.annotation.*;
import java.lang.reflect.*;
import java.net.*;
import java.nio.*;
import java.nio.channels.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.Supplier;
import java.util.logging.*;
import javax.annotation.Resource;
import org.redkale.convert.ConvertType;
import org.redkale.convert.bson.*;
import org.redkale.convert.json.*;
import org.redkale.mq.*;
import org.redkale.net.*;
import static org.redkale.net.sncp.SncpRequest.*;
import org.redkale.service.*;
import org.redkale.util.*;
import org.redkale.service.RpcCall;

/**
 *
 * <p>
 * 详情见: https://redkale.org
 *
 * @author zhangjx
 */
public final class SncpClient {

    protected static final Logger logger = Logger.getLogger(SncpClient.class.getSimpleName());

    protected final JsonConvert convert = JsonFactory.root().getConvert();

    protected final String name;

    protected final boolean remote;

    private final Class serviceClass;

    protected final InetSocketAddress clientSncpAddress;

    private final byte[] addrBytes;

    private final int addrPort;

    protected final DLong serviceid;

    protected final int serviceversion;

    protected final SncpAction[] actions;

    protected final ExecutorService executor;

    protected final MessageAgent agent;

    protected final String topic;

    protected final Supplier<ByteBuffer> bufferSupplier;

    @Resource
    protected JsonConvert jsonConvert;

    @Resource
    protected BsonConvert bsonConvert;

    //远程模式, 可能为null
    protected Set<String> remoteGroups;

    //远程模式, 可能为null
    protected Transport remoteGroupTransport;

    public <T extends Service> SncpClient(final String serviceName, final Class<T> serviceTypeOrImplClass, final T service, MessageAgent agent, final TransportFactory factory,
        final boolean remote, final Class serviceClass, final InetSocketAddress clientSncpAddress) {
        this.remote = remote;
        this.executor = factory.getExecutor();
        this.bufferSupplier = factory.getBufferSupplier();
        this.agent = agent;
        this.topic = agent == null ? null : agent.generateSncpReqTopic(service);
        Class<?> tn = serviceTypeOrImplClass;
        Version ver = tn.getAnnotation(Version.class);
        this.serviceClass = serviceClass;
        this.serviceversion = ver == null ? 0 : ver.value();
        this.clientSncpAddress = clientSncpAddress;
        this.name = serviceName;
        ResourceType rt = tn.getAnnotation(ResourceType.class);
        if (rt != null) tn = rt.value();
        this.serviceid = Sncp.hash(tn.getName() + ':' + serviceName);
        final List<SncpAction> methodens = new ArrayList<>();
        //------------------------------------------------------------------------------
        for (java.lang.reflect.Method method : parseMethod(serviceClass)) {
            methodens.add(new SncpAction(serviceClass, method, Sncp.hash(method)));
        }
        this.actions = methodens.toArray(new SncpAction[methodens.size()]);
        this.addrBytes = clientSncpAddress == null ? new byte[4] : clientSncpAddress.getAddress().getAddress();
        this.addrPort = clientSncpAddress == null ? 0 : clientSncpAddress.getPort();
        if (this.addrBytes.length != 4) throw new RuntimeException("SNCP clientAddress only support IPv4");
    }

    static List<SncpAction> getSncpActions(final Class serviceClass) {
        final List<SncpAction> actions = new ArrayList<>();
        //------------------------------------------------------------------------------
        for (java.lang.reflect.Method method : parseMethod(serviceClass)) {
            actions.add(new SncpAction(serviceClass, method, Sncp.hash(method)));
        }
        return actions;
    }

    public MessageAgent getMessageAgent() {
        return agent;
    }

    public InetSocketAddress getClientAddress() {
        return clientSncpAddress;
    }

    public DLong getServiceid() {
        return serviceid;
    }

    public int getServiceversion() {
        return serviceversion;
    }

    public int getActionCount() {
        return actions.length;
    }

    public Set<String> getRemoteGroups() {
        return remoteGroups;
    }

    public void setRemoteGroups(Set<String> remoteGroups) {
        this.remoteGroups = remoteGroups;
    }

    public Transport getRemoteGroupTransport() {
        return remoteGroupTransport;
    }

    public void setRemoteGroupTransport(Transport remoteGroupTransport) {
        this.remoteGroupTransport = remoteGroupTransport;
    }

    @Override
    public String toString() {
        String service = serviceClass.getName();
        if (remote) service = service.replace(Sncp.LOCALPREFIX, Sncp.REMOTEPREFIX);
        return this.getClass().getSimpleName() + "(service = " + service + ", serviceid = " + serviceid + ", serviceversion = " + serviceversion + ", name = '" + name
            + "', address = " + (clientSncpAddress == null ? "" : (clientSncpAddress.getHostString() + ":" + clientSncpAddress.getPort()))
            + ", actions.size = " + actions.length + ")";
    }

    public String toSimpleString() { //给Sncp产生的Service用
        String service = serviceClass.getName();
        if (remote) service = service.replace(Sncp.LOCALPREFIX, Sncp.REMOTEPREFIX);
        return service + "(name = '" + name + "', serviceid = " + serviceid + ", serviceversion = " + serviceversion
            + ", clientaddr = " + (clientSncpAddress == null ? "" : (clientSncpAddress.getHostString() + ":" + clientSncpAddress.getPort()))
            + ((remoteGroups == null || remoteGroups.isEmpty()) ? "" : ", remoteGroups = " + remoteGroups)
            + (remoteGroupTransport == null ? "" : ", remoteGroupTransport = " + Arrays.toString(remoteGroupTransport.getRemoteAddresses()))
            + ", actions.size = " + actions.length + ")";
    }

    public static List<Method> parseMethod(final Class serviceClass) {
        final List<Method> list = new ArrayList<>();
        final List<Method> multis = new ArrayList<>();
        final Map<DLong, Method> actionids = new HashMap<>();

        for (final java.lang.reflect.Method method : serviceClass.getMethods()) {
            if (method.isSynthetic()) continue;
            if (Modifier.isStatic(method.getModifiers())) continue;
            if (Modifier.isFinal(method.getModifiers())) continue;
            if (method.getAnnotation(Local.class) != null) continue;
            if (method.getName().equals("getClass") || method.getName().equals("toString")) continue;
            if (method.getName().equals("equals") || method.getName().equals("hashCode")) continue;
            if (method.getName().equals("notify") || method.getName().equals("notifyAll") || method.getName().equals("wait")) continue;
            if (method.getName().equals("init") || method.getName().equals("destroy")) continue;
            //if (method.getName().equals("version") || method.getName().equals("name")) continue;
            //if (onlySncpDyn && method.getAnnotation(SncpDyn.class) == null) continue;
            DLong actionid = Sncp.hash(method);
            Method old = actionids.get(actionid);
            if (old != null) {
                if (old.getDeclaringClass().equals(method.getDeclaringClass()))
                    throw new RuntimeException(serviceClass.getName() + " have one more same action(Method=" + method + ", " + old + ", actionid=" + actionid + ")");
                continue;
            }
            actionids.put(actionid, method);
            if (method.getAnnotation(SncpDyn.class) != null) {
                multis.add(method);
            } else {
                list.add(method);
            }
        }
        multis.sort((m1, m2) -> m1.getAnnotation(SncpDyn.class).index() - m2.getAnnotation(SncpDyn.class).index());
        list.sort((Method o1, Method o2) -> {
            if (!o1.getName().equals(o2.getName())) return o1.getName().compareTo(o2.getName());
            if (o1.getParameterCount() != o2.getParameterCount()) return o1.getParameterCount() - o2.getParameterCount();
            return 0;
        });
        //带SncpDyn必须排在前面
        multis.addAll(list);
        return multis;
    }

    //只给远程模式调用的
    public <T> T remote(final int index, final Object... params) {
        final SncpAction action = actions[index];
        final CompletionHandler handlerFunc = action.handlerFuncParamIndex >= 0 ? (CompletionHandler) params[action.handlerFuncParamIndex] : null;
        if (action.handlerFuncParamIndex >= 0) params[action.handlerFuncParamIndex] = null;
        final BsonReader reader = bsonConvert.pollBsonReader();
        CompletableFuture<byte[]> future = remote0(handlerFunc, remoteGroupTransport, null, action, params);
        if (action.boolReturnTypeFuture) { //与handlerFuncIndex互斥
            CompletableFuture result = action.futureCreator.create();
            future.whenComplete((v, e) -> {
                try {
                    if (e != null) {
                        result.completeExceptionally(e);
                    } else {
                        reader.setBytes(v);
                        byte i;
                        while ((i = reader.readByte()) != 0) {
                            final Attribute attr = action.paramAttrs[i];
                            attr.set(params[i - 1], bsonConvert.convertFrom(attr.genericType(), reader));
                        }
                        Object rs = bsonConvert.convertFrom(Object.class, reader);

                        result.complete(rs);
                    }
                } catch (Exception exp) {
                    result.completeExceptionally(exp);
                } finally {
                    bsonConvert.offerBsonReader(reader);
                }
            }); //需要获取  Executor
            return (T) result;
        }
        if (handlerFunc != null) return null;
        try {
            reader.setBytes(future.get(5, TimeUnit.SECONDS));
            byte i;
            while ((i = reader.readByte()) != 0) {
                final Attribute attr = action.paramAttrs[i];
                attr.set(params[i - 1], bsonConvert.convertFrom(attr.genericType(), reader));
            }
            return bsonConvert.convertFrom(action.handlerFuncParamIndex >= 0 ? Object.class : action.resultTypes, reader);
        } catch (RpcRemoteException re) {
            throw re;
        } catch (TimeoutException e) {
            throw new RpcRemoteException(actions[index].method + " sncp remote timeout, params=" + JsonConvert.root().convertTo(params));
        } catch (InterruptedException | ExecutionException e) {
            throw new RpcRemoteException(actions[index].method + " sncp remote error, params=" + JsonConvert.root().convertTo(params), e);
        } finally {
            bsonConvert.offerBsonReader(reader);
        }
    }

    private CompletableFuture<byte[]> remote0(final CompletionHandler handler, final Transport transport, final SocketAddress addr0, final SncpAction action, final Object... params) {
        final Type[] myparamtypes = action.paramTypes;
        final Class[] myparamclass = action.paramClass;
        if (action.addressSourceParamIndex >= 0) params[action.addressSourceParamIndex] = this.clientSncpAddress;
        if (bsonConvert == null) bsonConvert = BsonConvert.root();
        final BsonWriter writer = agent == null ? bsonConvert.pollBsonWriter() : bsonConvert.pollBsonWriter(transport.getBufferSupplier()); // 将head写入
        writer.writeTo(DEFAULT_HEADER);
        for (int i = 0; i < params.length; i++) {  //params 可能包含: 3 个 boolean
            BsonConvert bcc = bsonConvert;
            if (params[i] instanceof org.redkale.service.RetResult) {
                org.redkale.convert.Convert cc = ((org.redkale.service.RetResult) params[i]).convert();
                if (cc instanceof BsonConvert) bcc = (BsonConvert) cc;
            }
            bcc.convertTo(writer, CompletionHandler.class.isAssignableFrom(myparamclass[i]) ? CompletionHandler.class : myparamtypes[i], params[i]);
        }
        final int reqBodyLength = writer.count() - HEADER_SIZE; //body总长度
        final long seqid = System.nanoTime();
        final DLong actionid = action.actionid;
        if (agent != null) { //MQ模式
            final byte[] reqbytes = writer.toArray();
            fillHeader(ByteBuffer.wrap(reqbytes), seqid, actionid, reqBodyLength);
            MessageRecord message = new MessageRecord(ConvertType.BSON, this.topic, null, reqbytes);
            return agent.sendRemoteSncp(null, message).thenApply(msg -> {
                ByteBuffer buffer = ByteBuffer.wrap(msg.getContent());
                checkResult(seqid, action, buffer);

                final int respBodyLength = buffer.getInt();
                final int retcode = buffer.getInt();
                if (retcode != 0) {
                    logger.log(Level.SEVERE, action.method + " sncp (params: " + convert.convertTo(params) + ") deal error (retcode=" + retcode + ", retinfo=" + SncpResponse.getRetCodeInfo(retcode) + "), params=" + JsonConvert.root().convertTo(params));
                    throw new RuntimeException("remote service(" + action.method + ") deal error (retcode=" + retcode + ", retinfo=" + SncpResponse.getRetCodeInfo(retcode) + ")");
                }
                byte[] body = new byte[respBodyLength];
                buffer.get(body, 0, respBodyLength);
                return body;
            });
        }
        final SocketAddress addr = addr0 == null ? (action.addressTargetParamIndex >= 0 ? (SocketAddress) params[action.addressTargetParamIndex] : null) : addr0;
        CompletableFuture<AsyncConnection> connFuture = transport.pollConnection(addr);
        return connFuture.thenCompose(conn0 -> {
            final CompletableFuture<byte[]> future = new CompletableFuture();
            if (conn0 == null) {
                future.completeExceptionally(new RpcRemoteException("sncp " + (conn0 == null ? addr : conn0.getRemoteAddress()) + " cannot connect, params=" + JsonConvert.root().convertTo(params)));
                return future;
            }
            if (!conn0.isOpen()) {
                conn0.dispose();
                future.completeExceptionally(new RpcRemoteException("sncp " + conn0.getRemoteAddress() + " cannot connect, params=" + JsonConvert.root().convertTo(params)));
                return future;
            }
            final AsyncConnection conn = conn0;
            final ByteBuffer[] sendBuffers = writer.toBuffers();
            fillHeader(sendBuffers[0], seqid, actionid, reqBodyLength);

            conn.write(sendBuffers, sendBuffers, new CompletionHandler<Integer, ByteBuffer[]>() {

                @Override
                public void completed(Integer result, ByteBuffer[] attachments) {
                    int index = -1;
                    for (int i = 0; i < attachments.length; i++) {
                        if (attachments[i].hasRemaining()) {
                            index = i;
                            break;
                        } else {
                            transport.offerBuffer(attachments[i]);
                        }
                    }
                    if (index == 0) { //ByteBuffer[]不统一回收的必须采用此写法分开
                        conn.write(attachments, attachments, this);
                        return;
                    } else if (index > 0) {
                        ByteBuffer[] newattachs = new ByteBuffer[attachments.length - index];
                        System.arraycopy(attachments, index, newattachs, 0, newattachs.length);
                        conn.write(newattachs, newattachs, this);
                        return;
                    }
                    //----------------------- 读取返回结果 -------------------------------------     
                    conn.read(new CompletionHandler<Integer, ByteBuffer>() {

                        private byte[] body;

                        private int received;

                        @Override
                        public void completed(Integer count, ByteBuffer buffer) {
                            try {
                                if (count < 1 && buffer.remaining() == buffer.limit()) {   //没有数据可读
                                    future.completeExceptionally(new RpcRemoteException(action.method + " sncp[" + conn.getRemoteAddress() + "] remote no response data, params=" + JsonConvert.root().convertTo(params)));
                                    conn.offerBuffer(buffer);
                                    transport.offerConnection(true, conn);
                                    return;
                                }
                                if (received < 1 && buffer.limit() < buffer.remaining() + HEADER_SIZE) { //header都没读全
                                    conn.setReadBuffer(buffer);
                                    conn.read(this);
                                    return;
                                }
                                buffer.flip();
                                if (received > 0) {
                                    int offset = this.received;
                                    this.received += buffer.remaining();
                                    buffer.get(body, offset, Math.min(buffer.remaining(), this.body.length - offset));
                                    if (this.received < this.body.length) {// 数据仍然不全，需要继续读取          
                                        buffer.clear();
                                        conn.setReadBuffer(buffer);
                                        conn.read(this);
                                    } else {
                                        conn.offerBuffer(buffer);
                                        success();
                                    }
                                    return;
                                }
                                checkResult(seqid, action, buffer);

                                final int respBodyLength = buffer.getInt();
                                final int retcode = buffer.getInt();
                                if (retcode != 0) {
                                    logger.log(Level.SEVERE, action.method + " sncp (params: " + convert.convertTo(params) + ") deal error (retcode=" + retcode + ", retinfo=" + SncpResponse.getRetCodeInfo(retcode) + "), params=" + JsonConvert.root().convertTo(params));
                                    throw new RuntimeException("remote service(" + action.method + ") deal error (retcode=" + retcode + ", retinfo=" + SncpResponse.getRetCodeInfo(retcode) + ")");
                                }

                                if (respBodyLength > buffer.remaining()) { // 数据不全，需要继续读取
                                    this.body = new byte[respBodyLength];
                                    this.received = buffer.remaining();
                                    buffer.get(body, 0, this.received);
                                    buffer.clear();
                                    conn.setReadBuffer(buffer);
                                    conn.read(this);
                                } else {
                                    this.body = new byte[respBodyLength];
                                    buffer.get(body, 0, respBodyLength);
                                    conn.offerBuffer(buffer);
                                    success();
                                }
                            } catch (Throwable e) {
                                future.completeExceptionally(new RpcRemoteException(action.method + " sncp[" + conn.getRemoteAddress() + "] remote response error, params=" + JsonConvert.root().convertTo(params)));
                                transport.offerConnection(true, conn);
                                if (handler != null) {
                                    final Object handlerAttach = action.handlerAttachParamIndex >= 0 ? params[action.handlerAttachParamIndex] : null;
                                    handler.failed(e, handlerAttach);
                                }
                                logger.log(Level.SEVERE, action.method + " sncp (params: " + convert.convertTo(params) + ") deal error", e);
                            }
                        }

                        @SuppressWarnings("unchecked")
                        public void success() {
                            future.complete(this.body);
                            transport.offerConnection(false, conn);
                            if (handler != null) {
                                final Object handlerAttach = action.handlerAttachParamIndex >= 0 ? params[action.handlerAttachParamIndex] : null;
                                final BsonReader reader = bsonConvert.pollBsonReader();
                                try {
                                    reader.setBytes(this.body);
                                    int i;
                                    while ((i = (reader.readByte() & 0xff)) != 0) {
                                        final Attribute attr = action.paramAttrs[i];
                                        attr.set(params[i - 1], bsonConvert.convertFrom(attr.genericType(), reader));
                                    }
                                    Object rs = bsonConvert.convertFrom(action.handlerFuncParamIndex >= 0 ? Object.class : action.resultTypes, reader);
                                    handler.completed(rs, handlerAttach);
                                } catch (Exception e) {
                                    handler.failed(e, handlerAttach);
                                } finally {
                                    bsonConvert.offerBsonReader(reader);
                                }
                            }
                        }

                        @Override
                        public void failed(Throwable exc, ByteBuffer attachment2) {
                            future.completeExceptionally(new RpcRemoteException(action.method + " sncp remote exec failed, params=" + JsonConvert.root().convertTo(params)));
                            conn.offerBuffer(attachment2);
                            transport.offerConnection(true, conn);
                            if (handler != null) {
                                final Object handlerAttach = action.handlerAttachParamIndex >= 0 ? params[action.handlerAttachParamIndex] : null;
                                handler.failed(exc, handlerAttach);
                            }
                            logger.log(Level.SEVERE, action.method + " sncp (params: " + convert.convertTo(params) + ") remote read exec failed, params=" + JsonConvert.root().convertTo(params), exc);
                        }
                    });
                }

                @Override
                public void failed(Throwable exc, ByteBuffer[] attachment) {
                    future.completeExceptionally(new RpcRemoteException(action.method + " sncp remote exec failed, params=" + JsonConvert.root().convertTo(params)));
                    transport.offerConnection(true, conn);
                    if (handler != null) {
                        final Object handlerAttach = action.handlerAttachParamIndex >= 0 ? params[action.handlerAttachParamIndex] : null;
                        handler.failed(exc, handlerAttach);
                    }
                    logger.log(Level.SEVERE, action.method + " sncp (params: " + convert.convertTo(params) + ") remote write exec failed, params=" + JsonConvert.root().convertTo(params), exc);
                }
            });
            return future;
        });
    }

    private void checkResult(long seqid, final SncpAction action, ByteBuffer buffer) {
        long rseqid = buffer.getLong();
        if (rseqid != seqid) throw new RuntimeException("sncp(" + action.method + ") response.seqid = " + seqid + ", but request.seqid =" + rseqid);
        if (buffer.getChar() != HEADER_SIZE) throw new RuntimeException("sncp(" + action.method + ") buffer receive header.length not " + HEADER_SIZE);
        DLong rserviceid = DLong.read(buffer);
        if (!rserviceid.equals(this.serviceid)) throw new RuntimeException("sncp(" + action.method + ") response.serviceid = " + serviceid + ", but request.serviceid =" + rserviceid);
        int version = buffer.getInt();
        if (version != this.serviceversion) throw new RuntimeException("sncp(" + action.method + ") response.serviceversion = " + serviceversion + ", but request.serviceversion =" + version);
        DLong raction = DLong.read(buffer);
        DLong actid = action.actionid;
        if (!actid.equals(raction)) throw new RuntimeException("sncp(" + action.method + ") response.actionid = " + action.actionid + ", but request.actionid =(" + raction + ")");
        buffer.getInt();  //地址
        buffer.getChar(); //端口
    }

    private void fillHeader(ByteBuffer buffer, long seqid, DLong actionid, int bodyLength) {
        //---------------------head----------------------------------
        final int currentpos = buffer.position();
        buffer.position(0);
        buffer.putLong(seqid); //序列号
        buffer.putChar((char) HEADER_SIZE); //header长度
        DLong.write(buffer, this.serviceid);
        buffer.putInt(this.serviceversion);
        DLong.write(buffer, actionid);
        buffer.put(addrBytes);
        buffer.putChar((char) this.addrPort);
        buffer.putInt(bodyLength); //body长度        
        buffer.putInt(0); //结果码， 请求方固定传0
        buffer.position(currentpos);
    }

    protected static final class SncpAction {

        protected final DLong actionid;

        protected final Method method;

        protected final Type resultTypes;  //void 必须设为 null

        protected final Type[] paramTypes;

        protected final Class[] paramClass;

        protected final Attribute[] paramAttrs; // 为null表示无RpcCall处理，index=0固定为null, 其他为参数标记的RpcCall回调方法

        protected final int handlerFuncParamIndex;

        protected final int handlerAttachParamIndex;

        protected final int addressTargetParamIndex;

        protected final int addressSourceParamIndex;

        protected final boolean boolReturnTypeFuture; // 返回结果类型是否为 CompletableFuture

        protected final Creator<? extends CompletableFuture> futureCreator;

        @SuppressWarnings("unchecked")
        public SncpAction(final Class clazz, Method method, DLong actionid) {
            this.actionid = actionid == null ? Sncp.hash(method) : actionid;
            Type rt = TypeToken.getGenericType(method.getGenericReturnType(), clazz);
            this.resultTypes = rt == void.class ? null : rt;
            this.boolReturnTypeFuture = CompletableFuture.class.isAssignableFrom(method.getReturnType());
            this.futureCreator = boolReturnTypeFuture ? Creator.create((Class<? extends CompletableFuture>) method.getReturnType()) : null;
            this.paramTypes = TypeToken.getGenericType(method.getGenericParameterTypes(), clazz);
            this.paramClass = method.getParameterTypes();
            this.method = method;
            Annotation[][] anns = method.getParameterAnnotations();
            int targetAddrIndex = -1;
            int sourceAddrIndex = -1;
            int handlerAttachIndex = -1;
            int handlerFuncIndex = -1;
            boolean hasattr = false;
            Attribute[] atts = new Attribute[paramTypes.length + 1];
            if (anns.length > 0) {
                Class<?>[] params = method.getParameterTypes();
                for (int i = 0; i < params.length; i++) {
                    if (CompletionHandler.class.isAssignableFrom(params[i])) {
                        if (boolReturnTypeFuture) {
                            throw new RuntimeException(method + " have both CompletionHandler and CompletableFuture");
                        }
                        if (handlerFuncIndex >= 0) {
                            throw new RuntimeException(method + " have more than one CompletionHandler type parameter");
                        }
                        Sncp.checkAsyncModifier(params[i], method);
                        handlerFuncIndex = i;
                        break;
                    }
                }
                for (int i = 0; i < anns.length; i++) {
                    if (anns[i].length > 0) {
                        for (Annotation ann : anns[i]) {
                            if (ann.annotationType() == RpcAttachment.class) {
                                if (handlerAttachIndex >= 0) {
                                    throw new RuntimeException(method + " have more than one @RpcAttachment parameter");
                                }
                                handlerAttachIndex = i;
                            } else if (ann.annotationType() == RpcTargetAddress.class && SocketAddress.class.isAssignableFrom(params[i])) {
                                targetAddrIndex = i;
                            } else if (ann.annotationType() == RpcSourceAddress.class && SocketAddress.class.isAssignableFrom(params[i])) {
                                sourceAddrIndex = i;
                            }
                        }
                        for (Annotation ann : anns[i]) {
                            if (ann.annotationType() == RpcCall.class) {
                                try {
                                    atts[i + 1] = ((RpcCall) ann).value().getDeclaredConstructor().newInstance();
                                    hasattr = true;
                                } catch (Exception e) {
                                    logger.log(Level.SEVERE, RpcCall.class.getSimpleName() + ".attribute cannot a newInstance for" + method, e);
                                }
                                break;
                            }
                        }
                    }
                }
            }
            this.addressTargetParamIndex = targetAddrIndex;
            this.addressSourceParamIndex = sourceAddrIndex;
            this.handlerFuncParamIndex = handlerFuncIndex;
            this.handlerAttachParamIndex = handlerAttachIndex;
            this.paramAttrs = hasattr ? atts : null;
            if (this.handlerFuncParamIndex >= 0 && method.getReturnType() != void.class) {
                throw new RuntimeException(method + " have CompletionHandler type parameter but return type is not void");
            }
        }

        @Override
        public String toString() {
            return "{" + actionid + "," + (method == null ? "null" : method.getName()) + "}";
        }
    }
}