/*
 * (C) Copyright 1996- ECMWF.
 *
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 * In applying this licence, ECMWF does not waive the privileges and immunities
 * granted to it by virtue of its status as an intergovernmental organisation nor
 * does it submit to any jurisdiction.
 */

#ifndef eckit_TransportHandle_h
#define eckit_TransportHandle_h


#include "eckit/eckit.h"
#include "eckit/io/Buffer.h"
#include "eckit/io/DataHandle.h"



namespace eckit::distributed {

class Transport;

//----------------------------------------------------------------------------------------------------------------------

class TransportHandle : public eckit::DataHandle {

public: // methods


    /// Contructor

    TransportHandle(Transport& transport,
                    const std::string& path,
                    size_t writers,
                    bool exclusive);

    /// Destructor

    virtual ~TransportHandle() override;

    // From DataHandle

    virtual eckit::Length openForRead() override;
    virtual void openForWrite(const eckit::Length&) override;
    virtual void openForAppend(const eckit::Length&) override;

    virtual long read(void*, long) override;
    virtual long write(const void*, long) override;
    virtual void close() override;
    virtual void flush() override;
    virtual void rewind() override;
    virtual void print(std::ostream&) const override;

    virtual eckit::Length estimate() override;
    virtual eckit::Offset position() override;

private: // members

    Transport&  transport_;
    std::string path_;
    size_t      writer_;

    bool        opened_;
    bool        append_;
    size_t      position_;

    virtual std::string title() const override;

    void send(const void *buffer, size_t length);

};


//----------------------------------------------------------------------------------------------------------------------


} // namespace eckit

#endif
