stasis-aries-wal/stasis/operations/arrayList.h

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/**
   @file

   @ingroup ARRAY_LIST

   @defgroup ARRAY_LIST ArrayList

   O(1) growable array.

   ArrayList provides an growable array of fixed length records with
   O(1) complexity for all operations.  The list grows by doubling the
   amount of space it reserves each time the list is extended.
   Therefore, this data structure can use up to twice as much storage
   as is strictly necessary.

   These arrays are similar to those in Java's ArrayList class.
   Essentially, the base page contains a fixed size array of recordid's
   pointing at contiguous blocks of pages.  Each block is twice as big
   as the previous block.

   The base block is of type FIXED_PAGE, of int values. The first few slots
   are reserved and store information about the arrayList (size of
   array entries, number/size of allocated regions, etc.)

   @todo arrayList's base block should store pageid_t values, not ints.

   @ingroup COLLECTIONS

   $Id$
*/


/** @ingroup ARRAY_LIST */
/** @{ */
#ifndef __ARRAY_LIST_H
#define __ARRAY_LIST_H
#include <stasis/operations.h>
/** Allocate a new array list.

    @param xid The transaction allocating the new arrayList.

    @param numPages The number of pages to be allocated as part of the
           first region.  (The arraylist starts with zero capacity
           regardless of this parameter's value.)

    @param multiplier Each time the array list runs out of space, the
           allocate multipler times more space than last time.

    @param recordSize The size of the things stored in this arrayList.
           Must fit on a single page (arrayList cannot store blobs.)

*/

recordid TarrayListAlloc(int xid, pageid_t numPages, int multiplier, int recordSize);
void TarrayListDealloc(int xid, recordid rid);

/**
   Extend the ArrayList in place and zero out the newly allocated records.

   @param xid the transaction performing the expansion
   @param rid the recordid pointing to the ArrayList.
   @param slots the number of slots to end to the end of the ArrayList.
 */
compensated_function int TarrayListExtend(int xid, recordid rid, int slots);
/**
   Get the length of an ArrayList.

   @param xid the transaction performing the expansion
   @param rid the recordid pointing to the ArrayList.
   @return The number of items stored in the ArrayList.
 */
compensated_function int TarrayListLength(int xid, recordid rid);

/** Used by Tread() and Tset() to map from arrayList index to recordid. */
recordid stasis_array_list_dereference_recordid(int xid, Page * p, int offset);

stasis_operation_impl stasis_op_impl_array_list_header_init();
/** @} */
#endif