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/**
* @copyright
* ====================================================================
* 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.
* ====================================================================
* @endcopyright
*/
#ifndef SVNXX_PRIVATE_APRWRAP_POOL_H
#define SVNXX_PRIVATE_APRWRAP_POOL_H
#include <cstdlib>
#include <functional>
#include <memory>
#include "svnxx/exception.hpp"
#include "svnxx/detail/noncopyable.hpp"
#include "../private/init_private.hpp"
#include "svn_pools.h"
namespace apache {
namespace subversion {
namespace svnxx {
namespace apr {
struct delete_pool
{
void operator() (apr_pool_t* pool)
{
svn_pool_destroy(pool);
}
};
using pool_ptr = std::unique_ptr<apr_pool_t, delete_pool>;
/**
* Encapsulates an APR pool.
*/
class pool : pool_ptr
{
friend class iteration;
struct iteration_proxy
{
pool& proxied_pool;
};
static apr_pool_t* get_root_pool();
struct allocation_size_overflowed final : public allocation_failed
{
allocation_size_overflowed() noexcept
: allocation_failed("svn++ allocation size overflowed")
{}
};
using allocator = std::function<void*(apr_pool_t*,apr_size_t)>;
template<typename T>
T* safe_alloc(std::size_t count, allocator allocate)
{
if (count > APR_SIZE_MAX / sizeof(T))
throw allocation_size_overflowed();
return static_cast<T*>(allocate(get(), count * sizeof(T)));
}
public:
/**
* Create a pool as a child of the application's root pool.
*/
pool()
: pool_ptr(svn_pool_create(get_root_pool()))
{}
/**
* Return a pool pointer that can be used by the C APIs.
*/
apr_pool_t* get() const noexcept
{
return pool_ptr::get();
}
/**
* Create a pool as a child of @a parent.
*/
explicit pool(const pool* parent)
: pool_ptr(svn_pool_create(parent->get()))
{}
/**
* Create a pool as a child of the global pool in @a state.
*/
explicit pool(const detail::global_state::ptr& state)
: pool_ptr(svn_pool_create(state->get_root_pool()))
{}
/**
* Clear the pool.
*/
void clear()
{
apr_pool_clear(get());
}
/**
* Allocate space for @a count elements of type @a T from the pool.
* The contents of the allocated buffer will contain unspecified data.
*/
template<typename T>
T* alloc(std::size_t count)
{
// apr_palloc may be a macro, so wrap it in a closure.
static const auto palloc = [](apr_pool_t* p, apr_size_t size)
{
return apr_palloc(p, size);
};
return safe_alloc<T>(count, palloc);
}
/**
* Allocate space for @a count elements of type @a T from the pool.
* The contents of the allocated buffer will be initialized to zero.
*/
template<typename T>
T* allocz(std::size_t count)
{
// apr_pcalloc may be a macro, so wrap it in a closure.
static const auto pcalloc = [](apr_pool_t* p, apr_size_t size)
{
return apr_pcalloc(p, size);
};
return safe_alloc<T>(count, pcalloc);
}
operator iteration_proxy() noexcept
{
return iteration_proxy{*this};
}
public:
/**
* Pool proxy used for iteration scratch pools.
*
* Construct this object inside a loop body in order to clear the
* proxied pool on every iteration.
*/
class iteration : detail::noncopyable
{
public:
/**
* The constructor clears the proxied pool.
*/
explicit iteration(pool::iteration_proxy iterbase)
: proxied(iterbase.proxied_pool)
{
proxied.clear();
}
/**
* Returns a reference to the proxied pool.
*/
apr::pool& get_pool() const noexcept
{
return proxied;
}
/**
* proxy method for pool::get()
*/
apr_pool_t* get() const noexcept
{
return proxied.get();
}
/**
* Proxy method for pool::alloc()
*/
template<typename T>
T* alloc(std::size_t count)
{
return proxied.alloc<T>(count);
}
/**
* Proxy method for pool::allocz()
*/
template<typename T>
T* allocz(std::size_t count)
{
return proxied.allocz<T>(count);
}
private:
apr::pool& proxied;
};
};
} // namespace apr
} // namespace svnxx
} // namespace subversion
} // namespace apache
#endif // SVNXX_PRIVATE_APRWRAP_POOL_H
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