stasis-aries-wal/src/stasis/operations.c

/*---
This software is copyrighted by the Regents of the University of
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each file where they apply.
                                                                                                                                 
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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U.S. government, the Government shall have only "Restricted Rights" in
the software and related documentation as defined in the Federal
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---*/
#include <config.h>
#include <stasis/common.h>

#include <assert.h>

#include <stasis/operations.h>
#include <stasis/logger/logEntry.h>
#include <stasis/page.h>

static stasis_operation_impl stasis_operation_table[MAX_OPERATIONS];

void stasis_operation_impl_register(stasis_operation_impl o) {
  if(stasis_operation_table[o.id].id != OPERATION_INVALID) {
    stasis_operation_impl old = stasis_operation_table[o.id];
    assert(o.id == old.id);
    assert(o.redo==old.redo && o.undo==old.undo && o.run==old.run);
  }
  stasis_operation_table[o.id] = o;
}
static int stasis_operations_initted = 0;
void stasis_operation_table_init() {
  if(!stasis_operations_initted) {
    stasis_operations_initted = 1;
    for(int i = 0; i < MAX_OPERATIONS; i++) {
      stasis_operation_table[i].id = OPERATION_INVALID;
      stasis_operation_table[i].redo = OPERATION_INVALID;
      stasis_operation_table[i].undo = OPERATION_INVALID;
      stasis_operation_table[i].run = NULL;
    }
  }

  stasis_operation_impl_register(stasis_op_impl_set());
  stasis_operation_impl_register(stasis_op_impl_set_inverse());

  stasis_operation_impl_register(stasis_op_impl_increment());
  stasis_operation_impl_register(stasis_op_impl_decrement());

  stasis_operation_impl_register(stasis_op_impl_alloc());

  stasis_operation_impl_register(stasis_op_impl_prepare());

  stasis_operation_impl_register(stasis_op_impl_lsn_free_set());
  stasis_operation_impl_register(stasis_op_impl_lsn_free_set_inverse());
  // placeholder
  // placeholder
  stasis_operation_impl_register(stasis_op_impl_dealloc());
  stasis_operation_impl_register(stasis_op_impl_realloc());
  
  stasis_operation_impl_register(stasis_op_impl_page_set_range());
  stasis_operation_impl_register(stasis_op_impl_page_set_range_inverse());
  
  stasis_operation_impl_register(stasis_op_impl_noop());
  
  stasis_operation_impl_register(stasis_op_impl_array_list_header_init());
  stasis_operation_impl_register(stasis_op_impl_page_initialize());
	
  stasis_operation_impl_register(stasis_op_impl_set_range());
  stasis_operation_impl_register(stasis_op_impl_set_range_inverse());
	
  stasis_operation_impl_register(stasis_op_impl_linked_list_insert());
  stasis_operation_impl_register(stasis_op_impl_linked_list_remove());

  stasis_operation_impl_register(stasis_op_impl_linear_hash_insert());
  stasis_operation_impl_register(stasis_op_impl_linear_hash_remove());

  stasis_operation_impl_register(stasis_op_impl_boundary_tag_alloc());

  // place holder

  stasis_operation_impl_register(stasis_op_impl_region_alloc());
  stasis_operation_impl_register(stasis_op_impl_region_alloc_inverse());

  stasis_operation_impl_register(stasis_op_impl_region_dealloc());
  stasis_operation_impl_register(stasis_op_impl_region_dealloc_inverse());

  stasis_operation_impl_register(stasis_op_impl_segment_file_pwrite());
  stasis_operation_impl_register(stasis_op_impl_segment_file_pwrite_inverse());
}



void stasis_operation_do(const LogEntry * e, Page * p) {

  if(p) assertlocked(p->rwlatch);
  assert(e->update.funcID != OPERATION_INVALID);
  stasis_operation_table[e->update.funcID].run(e, p);

  DEBUG("OPERATION xid %d Do, %lld {%lld:%lld}\n", e->xid,
      e->LSN, e->update.page, p ? stasis_page_lsn_read(p) : -1);

  if(p) stasis_page_lsn_write(e->xid, p, e->LSN);

}

void stasis_operation_redo(const LogEntry * e, Page * p) {
  // Only handle update log entries
  assert(e->type == UPDATELOG);
  // If this is a logical operation, something is broken
  assert(e->update.page != INVALID_PAGE);
  assert(e->update.funcID != OPERATION_INVALID);
  assert(stasis_operation_table[e->update.funcID].redo != OPERATION_INVALID);

  if(stasis_operation_table[e->update.funcID].redo == OPERATION_NOOP) {
    return;
  }
  if((!p) || stasis_page_lsn_read(p) < e->LSN ||
     e->update.funcID == OPERATION_SET_LSN_FREE ||
     e->update.funcID == OPERATION_SET_LSN_FREE_INVERSE) {
    DEBUG("OPERATION xid %d Redo, %lld {%lld:%lld}\n", e->xid,
           e->LSN, e->update.page, stasis_page_lsn_read(p));
    // Need to check the id field to find out what the REDO_action
    // is for this log type.

    // contrast with stasis_operation_do(), which doesn't check the .redo field
    assert(e->update.funcID != OPERATION_INVALID);
    assert(stasis_operation_table[e->update.funcID].redo != OPERATION_INVALID);
    stasis_operation_table[stasis_operation_table[e->update.funcID].redo]
      .run(e,p);
    if(p) stasis_page_lsn_write(e->xid, p, e->LSN);
  } else {
    DEBUG("OPERATION xid %d skip redo, %lld {%lld:%lld}\n", e->xid,
           e->LSN, e->update.page, stasis_page_lsn_read(p));
  }
}

void stasis_operation_undo(const LogEntry * e, lsn_t effective_lsn, Page * p) {
  // Only handle update entries
  assert(e->type == UPDATELOG);

  assert(e->update.funcID != OPERATION_INVALID);
  int undo = stasis_operation_table[e->update.funcID].undo;
  assert(undo != OPERATION_INVALID);

  if(e->update.page == INVALID_PAGE || e->update.page == SEGMENT_PAGEID) {
    // logical undos are executed unconditionally, as are segment-based undos

    DEBUG("OPERATION xid %d FuncID %d Undo, %d LSN %lld {logical}\n", e->xid,
          e->update.funcID, undo, e->LSN);

    stasis_operation_table[undo].run(e,0);
  } else {
    assert(p->id == e->update.page);

    if(stasis_page_lsn_read(p) < effective_lsn) {
      DEBUG("OPERATION xid %d Undo, %lld {%lld:%lld}\n", e->xid,
             e->LSN, e->update.page, stasis_page_lsn_read(p));
      stasis_operation_table[undo].run(e,p);
      stasis_page_lsn_write(e->xid, p, effective_lsn);
    } else {
      DEBUG("OPERATION xid %d skip undo, %lld {%lld:%lld}\n", e->xid,
             e->LSN, e->update.page, stasis_page_lsn_read(p));
    }
  }
}