トランザクションとロック

  const node = 'myGlobal';
  console.log('Set three values in three different transaction levels:');
  for (let i=1; i<4; i++) {
    irisjs.tStart();
    let lvl = irisjs.getTLevel()
    irisjs.set(('Value'+lvl), node, lvl);
    let val = '<valueless>'
    if (irisjs.isDefined(node,lvl)%10 > 0) val = irisjs.get(node,lvl);
    console.log('  ' + node + '(' + i + ') = ' + val + ' (tLevel is ' + lvl + ')');
  }
// Prints: Set three values in three different transaction levels:
//         myGlobal(1) = Value1 (tLevel is 1)
//         myGlobal(2) = Value2 (tLevel is 2)
//         myGlobal(3) = Value3 (tLevel is 3)

  console.log('Roll back two levels and commit the level 1 transaction:');
  let act = ['  tRollbackOne','  tRollbackOne','       tCommit'];
  for (let i=3; i>0; i--) {
    if (i>1) {irisjs.tRollbackOne();} else {irisjs.tCommit();}
    let val = '<valueless>'
    if (irisjs.isDefined(node,i)%10 > 0) val = irisjs.getString(node,i);
    console.log(act[3-i]+' (tLevel='+irisjs.getTLevel()+'): '+node+'('+i+') = '+val);
  }

// Prints: Roll back two levels and commit the level 1 transaction:
//           tRollbackOne (tLevel=2): myGlobal(3) = <valueless>
//           tRollbackOne (tLevel=1): myGlobal(2) = <valueless>
//                tCommit (tLevel=0): myGlobal(1) = Value1

  irisjs.set('exclusive node','nodeOne');
  irisjs.set('shared node','nodeTwo');

// unlike global names, lock references *must* start with circumflex
  const nodeOneRef = '^nodeOne';
  const nodeTwoRef = '^nodeTwo';

  try {
    irisjs.tStart();
    irisjs.lock('E',10,nodeOneRef,''); // lock nodeOne exclusively
    irisjs.lock('S',10,nodeTwoRef,''); // lock nodeTwo shared
    console.log('Exclusive lock on nodeOne and shared lock on nodeTwo');

    alert('Press return to release locks individually');
    irisjs.unlock('D',nodeOneRef,''); // release nodeOne after transaction
    irisjs.unlock('I',nodeTwoRef,''); // release nodeTwo immediately

    alert('Press return to commit transaction');
    irisjs.tCommit();
  }
  catch { console.log('error'); }

// lock nodeOne non-incremental, nodeTwo shared non-incremental
  irisjs.lock('',10,nodeOneRef,'');

  alert('Exclusive lock on nodeOne, return to lock nodeOne non-incrementally');
  irisjs.lock('S',10,nodeTwoRef,'');

  alert('Verify that only nodeTwo is now locked, then press return');

// lock nodeOne shared incremental, nodeTwo exclusive incremental
  irisjs.lock('SE',10,nodeOneRef,'');
  irisjs.lock('E',10,nodeTwoRef,'');

  alert('Two locks are held (one with lock count 2), return to release both locks');
  irisjs.releaseAllLocks();

  alert('Verify both locks have been released, then press return');