hadoop-hdfs-project/hadoop-hdfs/src/contrib/libhdfs3/src/rpc/RpcRemoteCall.h

/**
 * 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.
 */

#ifndef _HDFS_LIBHDFS3_RPC_RPCREMOTECALL_
#define _HDFS_LIBHDFS3_RPC_RPCREMOTECALL_

#include "DateTime.h"
#include "ExceptionInternal.h"
#include "RpcCall.h"
#include "RpcProtocolInfo.h"
#include "SharedPtr.h"
#include "Thread.h"
#include "WriteBuffer.h"

#include <stdint.h>
#include <string>

#define INVALID_RETRY_COUNT -1

namespace hdfs {
namespace internal {

class RpcRemoteCall;
typedef shared_ptr<RpcRemoteCall> RpcRemoteCallPtr;

class RpcRemoteCall {
public:
    RpcRemoteCall(const RpcCall &c, int32_t id, const std::string &clientId) :
        complete(false), identity(id), call(c), clientId(clientId) {
    }

    virtual ~RpcRemoteCall() {
    }

    virtual void cancel(exception_ptr reason) {
        unique_lock<mutex> lock(mut);
        complete = true;
        error = reason;
        cond.notify_all();
    }

    virtual void serialize(const RpcProtocolInfo &protocol,
                           WriteBuffer &buffer);

    const int32_t getIdentity() const {
        return identity;
    }

    void wait() {
        unique_lock<mutex> lock(mut);

        if (!complete) {
            cond.wait_for(lock, milliseconds(500));
        }
    }

    void check() {
        if (error != exception_ptr()) {
            rethrow_exception(error);
        }
    }

    RpcCall &getCall() {
        return call;
    }

    void done() {
        unique_lock<mutex> lock(mut);
        complete = true;
        cond.notify_all();
    }

    void wakeup() {
        cond.notify_all();
    }

    bool finished() {
        unique_lock<mutex> lock(mut);
        return complete;
    }

public:
    static std::vector<char> GetPingRequest(const std::string &clientid);

private:
    bool complete;
    condition_variable cond;
    const int32_t identity;
    exception_ptr error;
    mutex mut;
    RpcCall call;
    std::string clientId;
};

}
}

#endif /* _HDFS_LIBHDFS3_RPC_RPCREMOTECALL_ */