pool.hpp

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/*
 * Copyright 2016, Intel Corporation
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *
 *     * Neither the name of the copyright holder nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef PMEMOBJ_POOL_HPP
#define PMEMOBJ_POOL_HPP

#include <stddef.h>
#include <sys/stat.h>

#include "libpmemobj++/detail/pexceptions.hpp"
#include "libpmemobj++/p.hpp"
#include "libpmemobj/pool_base.h"

namespace nvml
{

namespace obj
{
template <typename T>
class persistent_ptr;

class pool_base {
public:
    pool_base() noexcept : pop(nullptr)
    {
    }

    explicit pool_base(pmemobjpool *cpop) noexcept : pop(cpop)
    {
    }

    pool_base(const pool_base &) noexcept = default;

    pool_base(pool_base &&) noexcept = default;

    pool_base &operator=(const pool_base &) noexcept = default;

    pool_base &operator=(pool_base &&) noexcept = default;

    virtual ~pool_base() noexcept = default;

    static pool_base
    open(const std::string &path, const std::string &layout)
    {
        pmemobjpool *pop = pmemobj_open(path.c_str(), layout.c_str());
        if (pop == nullptr)
            throw pool_error("Failed opening pool");

        return pool_base(pop);
    }

    static pool_base
    create(const std::string &path, const std::string &layout,
           std::size_t size = PMEMOBJ_MIN_POOL,
           mode_t mode = S_IWUSR | S_IRUSR)
    {
        pmemobjpool *pop = pmemobj_create(path.c_str(), layout.c_str(),
                          size, mode);
        if (pop == nullptr)
            throw pool_error("Failed creating pool");

        return pool_base(pop);
    }

    static int
    check(const std::string &path, const std::string &layout) noexcept
    {
        return pmemobj_check(path.c_str(), layout.c_str());
    }

    void
    close()
    {
        if (this->pop == nullptr)
            throw std::logic_error("Pool already closed");

        pmemobj_close(this->pop);
        this->pop = nullptr;
    }

    void
    persist(const void *addr, size_t len) noexcept
    {
        pmemobj_persist(this->pop, addr, len);
    }

    template <typename Y>
    void
    persist(const p<Y> &prop) noexcept
    {
        pmemobj_persist(this->pop, &prop, sizeof(Y));
    }

    template <typename Y>
    void
    persist(const persistent_ptr<Y> &ptr) noexcept
    {
        pmemobj_persist(this->pop, &ptr, sizeof(ptr));
    }

    void
    flush(const void *addr, size_t len) noexcept
    {
        pmemobj_flush(this->pop, addr, len);
    }

    template <typename Y>
    void
    flush(const p<Y> &prop) noexcept
    {
        pmemobj_flush(this->pop, &prop, sizeof(Y));
    }

    template <typename Y>
    void
    flush(const persistent_ptr<Y> &ptr) noexcept
    {
        pmemobj_flush(this->pop, &ptr, sizeof(ptr));
    }

    void
    drain(void) noexcept
    {
        pmemobj_drain(this->pop);
    }

    void *
    memcpy_persist(void *dest, const void *src, size_t len) noexcept
    {
        return pmemobj_memcpy_persist(this->pop, dest, src, len);
    }

    void *
    memset_persist(void *dest, int c, size_t len) noexcept
    {
        return pmemobj_memset_persist(this->pop, dest, c, len);
    }

    /*
     * Gets the C style handle to the pool.
     *
     * Necessary to be able to use the pool with the C API.
     *
     * @return pool opaque handle.
     */
    PMEMobjpool *
    get_handle() noexcept
    {
        return this->pop;
    }

protected:
    /* The pool opaque handle */
    PMEMobjpool *pop;
};

template <typename T>
class pool : public pool_base {
public:
    pool() noexcept = default;

    pool(const pool &) noexcept = default;

    pool(pool &&) noexcept = default;

    pool &operator=(const pool &) noexcept = default;

    pool &operator=(pool &&) noexcept = default;

    ~pool() noexcept = default;

    explicit pool(const pool_base &pb) noexcept : pool_base(pb)
    {
    }

    explicit pool(pool_base &&pb) noexcept : pool_base(pb)
    {
    }

    persistent_ptr<T>
    get_root()
    {
        if (pop == nullptr)
            throw pool_error("Invalid pool handle");

        persistent_ptr<T> root = pmemobj_root(this->pop, sizeof(T));
        return root;
    }

    static pool<T>
    open(const std::string &path, const std::string &layout)
    {
        return pool<T>(pool_base::open(path, layout));
    }

    static pool<T>
    create(const std::string &path, const std::string &layout,
           std::size_t size = PMEMOBJ_MIN_POOL,
           mode_t mode = S_IWUSR | S_IRUSR)
    {
        return pool<T>(pool_base::create(path, layout, size, mode));
    }

    static int
    check(const std::string &path, const std::string &layout)
    {
        return pool_base::check(path, layout);
    }
};

} /* namespace obj */

} /* namespace nvml */

#endif /* PMEMOBJ_POOL_HPP */