kc3-lang/kc3/libc3/facts_transaction.c

• Show log

  Commit

• Hash : 0cbdc44d
  Author : Thomas de Grivel
  Date : 2024-05-21T05:45:55
  

  wip error handling

Download

• libc3/facts_transaction.c

• /* c3
   * Copyright 2022-2024 kmx.io <contact@kmx.io>
   *
   * Permission is hereby granted to use this software granted the above
   * copyright notice and this permission paragraph are included in all
   * copies and substantial portions of this software.
   *
   * THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
   * PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
   * AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
   * THIS SOFTWARE.
   */
  #include <stdlib.h>
  #include "assert.h"
  #include "fact_action.h"
  #include "facts.h"
  #include "facts_transaction.h"
  #include "list.h"
  
  s_facts_transaction * facts_transaction_clean
  (s_facts_transaction *transaction)
  {
    assert(transaction);
    fact_action_delete_all(transaction->log);
    return transaction->next;
  }
  
  s_facts * facts_transaction_rollback
  (s_facts *facts, const s_facts_transaction *transaction)
  {
    bool b;
    s_fact_action *log;
    const s_facts_transaction *t;
    t = facts->transaction;
    while (t) {
      if (t == transaction)
        goto rollback;
      t = t->next;
    }
    err_puts("facts_transaction_rollback: transaction not found");
    assert(! "facts_transaction_rollback: transaction not found");
    return NULL;
   rollback:
    while (t) {
      log = t->log;
      while (log) {
        if (log->remove) {
          if (! facts_add_fact(facts, &log->fact))
            return NULL;
        }
        else {
          if (! facts_remove_fact(facts, &log->fact, &b) ||
              ! b)
            return NULL;
        }
        log = log->next;
      }
      if (t == transaction)
        return facts;
      t = t->next;
    }
    err_puts("facts_transaction_rollback: unknown error");
    assert(! "facts_transaction_rollback: unknown error");
    exit(1);
    return NULL;
  }
  
  void facts_transaction_start (s_facts *facts,
                                s_facts_transaction *transaction)
  {
    assert(facts);
    assert(transaction);
    transaction->log = NULL;
    transaction->next = facts->transaction;
    facts->transaction = transaction;
  }
  

Download