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'use strict';
/**
* remove_single_document.js
*
* Repeatedly remove a document from the collection.
*/
var $config = (function() {
var states = {
remove: function remove(db, collName) {
// try removing a random document
var res = this.doRemove(db,
collName,
{ rand: { $gte: Random.rand() } },
{ justOne: true });
assertAlways.lte(res.nRemoved, 1);
if (res.nRemoved === 0) {
// The above remove() can fail to remove a document when the random value
// in the query is greater than any of the random values in the collection.
// When that situation occurs, just remove an arbitrary document instead.
res = this.doRemove(db,
collName,
{},
{ justOne: true });
assertAlways.lte(res.nRemoved, 1);
}
this.assertResult(res);
}
};
var transitions = {
remove: { remove: 1 }
};
function setup(db, collName, cluster) {
// insert enough documents so that each thread can remove exactly one per iteration
var num = this.threadCount * this.iterations;
for (var i = 0; i < num; ++i) {
db[collName].insert({ i: i, rand: Random.rand() });
}
assertWhenOwnColl.eq(db[collName].find().itcount(), num);
}
return {
threadCount: 10,
iterations: 20,
states: states,
transitions: transitions,
setup: setup,
data: {
doRemove: function doRemove(db, collName, query, options) {
return db[collName].remove(query, options);
},
assertResult: function assertResult(res) {
assertAlways.writeOK(res);
// when running on its own collection,
// this iteration should remove exactly one document
assertWhenOwnColl.eq(1, res.nRemoved, tojson(res));
}
},
startState: 'remove'
};
})();
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