ThreadSharedDataHandle.h

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/*
 * (C) Copyright 1996-2018 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.
 */
 
/// @author Simon Smart
/// @date Dec 2018
 
#ifndef odc_core_ThreadSharedDataHandle_H
#define odc_core_ThreadSharedDataHandle_H
 
#include <mutex>
#include <memory>
 
#include "eckit/io/DataHandle.h"
 
namespace eckit { class DataHandle; }
 
namespace odc {
namespace core {
 
//----------------------------------------------------------------------------------------------------------------------
 
class ThreadSharedDataHandle : public eckit::DataHandle {
 
public: // methods
 
    ThreadSharedDataHandle (eckit::DataHandle& dh);
    ThreadSharedDataHandle (eckit::DataHandle* dh);
    ~ThreadSharedDataHandle() override;
 
    ThreadSharedDataHandle(const ThreadSharedDataHandle&);
    ThreadSharedDataHandle& operator=(const ThreadSharedDataHandle&);
 
    ThreadSharedDataHandle(ThreadSharedDataHandle&&);
    ThreadSharedDataHandle& operator=(ThreadSharedDataHandle&&);
 
    bool operator!=(const ThreadSharedDataHandle& other);
    bool operator==(const ThreadSharedDataHandle& other);
 
    void print(std::ostream& s) const override;
 
    eckit::Length openForRead() override;
    void openForWrite(const eckit::Length&) override;
    void openForAppend(const eckit::Length&) override;
 
    long read(void*,long) override;
    long write(const void*,long) override;
    void close() override;
 
    eckit::Length estimate() override;
    eckit::Offset position() override;
    eckit::Offset seek(const eckit::Offset&) override;
 
    std::string title() const override;
 
private: // members
 
    struct Internal {
 
        Internal(eckit::DataHandle* dh, bool owned);
        ~Internal();
 
        std::mutex m_;
        eckit::DataHandle* dh_;
        bool owned_;
    };
 
    std::shared_ptr<Internal> internal_;
 
    eckit::Offset position_;
};
 
//----------------------------------------------------------------------------------------------------------------------
 
} // namespace core
} // namespace odc
 
#endif