/**************************************************************
 * 
 * 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.
 * 
 *************************************************************/



// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_store.hxx"

#include "storbase.hxx"

#include "sal/types.h"
#include "rtl/alloc.h"
#include "rtl/ref.hxx"
#include "osl/diagnose.h"

#include "store/types.h"
#include "object.hxx"

#ifndef INCLUDED_STDIO_H
#include <stdio.h>
#define INCLUDED_STDIO_H
#endif

using namespace store;

/*========================================================================
 *
 * SharedCount::Allocator.
 *
 *======================================================================*/
SharedCount::Allocator &
SharedCount::Allocator::get()
{
    static Allocator g_aSharedCountAllocator;
    return g_aSharedCountAllocator;
}

SharedCount::Allocator::Allocator()
{
    m_cache = rtl_cache_create (
        "store_shared_count_cache",
        sizeof(long),
        0, // objalign
        0, // constructor
        0, // destructor
        0, // reclaim
        0, // userarg
        0, // default source
        0  // flags
        );
}

SharedCount::Allocator::~Allocator()
{
    rtl_cache_destroy (m_cache), m_cache = 0;
}

/*========================================================================
 *
 * PageData::Allocator_Impl (default allocator).
 *
 *======================================================================*/
namespace store
{

class PageData::Allocator_Impl :
    public store::OStoreObject,
    public store::PageData::Allocator
{
public:
    /** Construction (two phase).
     */
    Allocator_Impl();

    storeError initialize (sal_uInt16 nPageSize);

    /** Delegate multiple inherited rtl::IReference.
     */
    virtual oslInterlockedCount SAL_CALL acquire()
    {
        return OStoreObject::acquire();
    }
    virtual oslInterlockedCount SAL_CALL release()
    {
        return OStoreObject::release();
    }

protected:
    /** Destruction.
     */
    virtual ~Allocator_Impl();

private:
    /** Representation.
     */
    rtl_cache_type * m_page_cache;
    sal_uInt16       m_page_size;

    /** PageData::Allocator implementation.
     */
    virtual void allocate_Impl (void ** ppPage, sal_uInt16 * pnSize);
    virtual void deallocate_Impl (void * pPage);

    /** Not implemented.
     */
    Allocator_Impl (Allocator_Impl const &);
    Allocator_Impl & operator= (Allocator_Impl const &);
};

} // namespace store

PageData::Allocator_Impl::Allocator_Impl()
    : m_page_cache(0), m_page_size(0)
{}

storeError
PageData::Allocator_Impl::initialize (sal_uInt16 nPageSize)
{
    char name[RTL_CACHE_NAME_LENGTH + 1];
    sal_Size size = sal::static_int_cast< sal_Size >(nPageSize);
    (void) snprintf (name, sizeof(name), "store_page_alloc_%lu", size);

    m_page_cache = rtl_cache_create (name, size, 0, 0, 0, 0, 0, 0, 0);
    if (!m_page_cache)
        return store_E_OutOfMemory;

    m_page_size = nPageSize;
    return store_E_None;
}

PageData::Allocator_Impl::~Allocator_Impl()
{
    rtl_cache_destroy(m_page_cache), m_page_cache = 0;
}

void PageData::Allocator_Impl::allocate_Impl (void ** ppPage, sal_uInt16 * pnSize)
{
    OSL_PRECOND((ppPage != 0) && (pnSize != 0), "contract violation");
    if ((ppPage != 0) && (pnSize != 0))
        *ppPage = rtl_cache_alloc(m_page_cache), *pnSize = m_page_size;
}

void PageData::Allocator_Impl::deallocate_Impl (void * pPage)
{
    OSL_PRECOND(pPage != 0, "contract violation");
    rtl_cache_free(m_page_cache, pPage);
}

/*========================================================================
 *
 * PageData::Allocator factory.
 *
 *======================================================================*/

storeError
PageData::Allocator::createInstance (rtl::Reference< PageData::Allocator > & rxAllocator, sal_uInt16 nPageSize)
{
    rtl::Reference< PageData::Allocator_Impl > xAllocator (new PageData::Allocator_Impl());
    if (!xAllocator.is())
        return store_E_OutOfMemory;

    rxAllocator = &*xAllocator;
    return xAllocator->initialize (nPageSize);
}

/*========================================================================
 *
 * OStorePageObject.
 *
 *======================================================================*/
/*
 * ~OStorePageObject.
 */
OStorePageObject::~OStorePageObject (void)
{
}